OKIDATA ML393C Plus Service manual

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Page: 1
Service Guide ML393/ML393CPlus
Chapter 0 About This Manual
ML393Plus // ML393C Plus
Dot Matrix Printers
Adobe Acrobat printable reference
copy of the OKIDATA Service Training Manual.
09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the
pictures rendered at 300 dpi, which is ideal for printing, but does not view on most
displays well.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Table of Contents
Page
Service Guide ML393/ML393CPlus
0 About This Manual
Front Cover
Copyright
1 Specifications
1.1 Overview - General Information/Specifications
1.2 Physical Specifications
1.3 Power Requirements
1.4 Environmental Conditions
1.5 Agency Approvals
1.6 Operational Specifications - Character Matrix Sizes
....1.6.02 Characters Per Line
....1.6.03 Character Pitches
....1.6.04 Character Sets
....1.6.05 Emulations
....1.6.06 Fonts
....1.6.07 Front Panel Switches
....1.6.08 Graphics Resolution
....1.6.09 Interface
....1.6.10 Line Feed Increments
....1.6.11 Line Feed Time
....1.6.12 Menu Mode
....1.6.13 Paper Feed Methods
....1.6.14 Paper Feed Paths
....1.6.15 Paper Loading
....1.6.16 Paper Out Detection
....1.6.17 Paper Tear Capabilities
....1.6.18 Print Method
....1.6.19 Print Modes
....1.6.20 Print Speed
1.7 Paper Specifications
1.8 Memory Specifications
1.9 Consumables
1.10 Options
1.11 Reliability
2 Principles of Operation
2.1 Principles of Operation - General Information
....2.1.02 Microprocessors (MPUs) and Peripheral Circuits
....2.1.03 Initialization
....2.1.04 Interface Control
....2.1.05 Printhead Drive Circuit
....2.1.06 Spacing Drive Circuit
....2.1.07 Line Feed Circuit
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Table of Contents
....2.1.08 Alarm Circuits
....2.1.09 Paper End Detection Circuit
....2.1.10 Power Supply
2.2 Mechanical Operation - Printhead Mechanism
....2.2.02 Spacing
....2.2.03 Ribbon Drive
....2.2.04 Paper Feed
....2.2.05 Paper-End Detection
....2.2.06 Paper Park
....2.2.07 Automatic Paper Loading
3 Maintenance
3.1 Maintenance - General Information
3.2 Disassembly/Assembly Procedures - General Information
....3.2.01 Preliminary Items, Printhead
....3.2.02 Ribbon Guide
....3.2.03 Ribbon Protector
....3.2.04 Upper Cover Assembly
........Parts List
....3.2.05 Operator Panel Assembly
....3.2.06 Control Board (LQEM)
....3.2.07 Interface Connector Board (LQPN)
....3.2.08 Printer Mechanism
....3.2.09 Platen Assembly
....3.2.10 Line Feed Motor
....3.2.11 Printhead Cable Assembly
....3.2.12 Sensor Board
....3.2.13 Ribbon Feed Assembly
....3.2.14 Space Motor Assembly
....3.2.15 Space Belt
....3.2.16 Bail/Ribbon Motor Assembly
....3.2.17 Paper Bail Assembly
....3.2.18 Carriage and Carriage Shaft
........Parts List
....3.2.19 Paper Pressure Guide
....3.2.20 Printhead Gap / Release Lever Microswitches
....3.2.21 Push Tractor Assembly
........Procedure - Installation Notes
....3.2.22 Power Supply Unit
....Microline 393C-Plus - Color Model Only : Sections 3.2.23
through 3.2.28
........3.2.23 Ribbon Shift Arm Spring / Ribbon Shift Arm :
Microline 393C-Plus - Color Model Only
........3.2.24 Roller Lever : Microline 393C-Plus - Color Model
Only
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Table of Contents
........3.2.25 Ribbon Guide : Microline 393C-Plus - Color Model
Only
........3.2.26 Bail Open Cam and Bail Open Gear : Microline
393C-Plus - Color Model Only
........3.2.27 Ribbon Shift Cam and Ribbon Shift Gear :
Microline 393C-Plus - Color Model Only
........3.2.28 Ribbon Shift Cam Lever Assembly : Microline
393C-Plus - Color Model Only
....Cut Sheet Feeder - Option : Sections 3.2.29 Through 3.2.35
........3.2.29 Friction Sheet
........3.2.30 Rear Bin
........3.2.31 Side Cover
........3.2.32 Roller Supports and Rollers (H)
........3.2.33 Control Board
........3.2.34 Connection Cord
........3.2.35 Motor Assembly
3.3 Printer Adjustments - General Information
....3.3.02 Printhead Gap Adjustment
....3.3.03 Line Feed Belt Tension
....3.3.04 Color Adjustment (Microline 393C-Plus Printer)
....3.3.05 Key Combinations
....3.3.06 Menu Operation - General Information
........Menu Mode
........Menu Print
........Sample Menu
........Menu Settings
........Menu Reset
........Limited Operation
....3.3.07 Top of Form
....3.3.08 Paper Park
....3.3.09 Forms Tear Off
....3.3.10 Resets
3.4 Cleaning
3.5 Lubrication - General Information
....3.5.02 Lubrication Schedule
....3.5.03 Lubrication Types and Amounts
....3.5.04 Areas Not Lubricated
....Lubrication Points (Monochrome and Color)
....Platen, Carriage Shaft, Idle Gear
....Ribbon Feed Assembly
....Lubrication Points (Color)
....Lubrication Points (Options)
3.6 Shipping Instructions
4 Failure Analysis
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Table of Contents
4.1 Overview
4.2 Reporting Problems
4.3 Troubleshooting Updates
4.4 Troubleshooting Tips - Preliminary Checks
....4.4.02 Problem Categories
....4.4.03 START HERE Flowchart
....4.4.04 Tips for Preventing Image Problems
....4.4.05 Common Problems
........Epson / IBM, Self Test Revision 1.16 (FCO 7681)
........Missing Spaces When Printing Wide Reports (FCO 7693)
........Self Test Revisions 1.07 and 1.10 (FCO 7730)
........Parallel Timing Specification Changes
........Jumper SP2 Added to Main Control Board
........Font Name Changes in Menu Mode
........Modifications to Q6, Main Control Board
4.5 Abnormal Output
4.6 Fault Alarms
4.7 Repair Analysis Procedures (RAPS)
....RAP 01: Power Lamp Does Not Light
....RAP 02: Space Error (ALARM 57)
....RAP 03: Head Homing Error (ALARM 53)
....RAP 04: Ribbon Homing Error (ALARM 5B)
....RAP 05: Bail Home Error (ALARM 5C)
....RAP 06: Wrong Character, Character Omission, or Dot
Omission
....RAP 07: Ribbon Feed Trouble
....RAP 08: Line Feed Trouble
....RAP 09: Malfunction of Operator Panel Switch
....RAP 10A: Data Receive Failure
....RAP 10B: Parallel Interface Problem
....RAP 10C: Serial Interface Problem
....RAP 10D: Data Receive Failure (Alarm Light Lit)
....RAP 11: Color Ribbon Shift Problem
4.8 Printer Tests - General Information
....4.8.02 Rolling ASCII Print Test
....4.8.03 Font Test
....4.8.04 Serial Interface - Loopback Test
....4.8.05 Hexadecimal Dump
4.9 Resistance Checks - General Information
....4.9.02 Printhead Resistance Check
....4.9.03 Line Feed Motor Resistance Check
....4.9.04 Space Motor Resistance Check
....4.9.05 Ribbon Motor Resistance Check
A Board Diagrams
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Table of Contents
A.1 Overview - General Information
A.2 Index To Charts
....A.2.01 Main Control Board (LQEM)
....A.2.02 Power Supply
....A.2.03 Interface Board (LQPN)
....A.2.04 Sensor Board (LQEW or LPRW)
....A.2.05 Operator Panel Board (LQSX)
B Illustrated Parts Listing
B.1 Overview - General Information
....B.1.02 Definition of Terms
....B.1.03 Parts Ordering Information
B.2 Charts
....B.2.01 Printer Unit
....B.2.02 Upper Cover Assembly
....B.2.03 Printer Unit General Assembly (1 of 2)
....B.2.04 Printer Unit General Assembly (2 of 2)
....B.2.05 Operator Panel Assembly
....B.2.06 Printer Mechanism - Monochrome (1 of 3)
....B.2.07 Printer Mechanism - Monochrome (2 of 3)
....B.2.08 Printer Mechanism - Monochrome (3 of 3)
....B.2.09 Printer Mechanism - Color (1 of 3)
....B.2.10 Printer Mechanism - Color (2 of 3)
....B.2.11 Printer Mechanism - Color (3 of 3)
....B.2.12 Carriage Assembly - Monochrome
....B.2.13 Carriage Assembly - Color
....B.2.14 Options
....B.2.15 Pull Tractor Assembly (Option)
....B.2.16 Packing Materials
....B.2.17 Consumables
....B.2.18 Documentation
....B.2.19 Service Training Kit Revision List
C Microline 393/393C Specifications
C.1 Overview - General Information
C.2 Printer Specifications
C.3 Paper Specifications
C.4 Physical Specifications
C.5 Power Requirements
C.6 Environmental Conditions
C.7 Agency Approvals
C.8 Options
C.9 Consumables
C.10 Memory Specifications
C.11 Printer Reliability
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Page: 2
Service Guide ML393/ML393CPlus
Chapter 0 About This Manual
Microline 393 / 393C-Plus Service Handbook
This document may not be reproduced without the written permission of the Okidata Technical Training
Group. Every effort has been made to ensure the accuracy of the information contained in this training
course. Okidata is not responsible for errors beyond its control.
© 1995 by Okidata All rights reserved.
First Edition April 1990P/N 59241601
Second Edition February 1995P/N 59241602
Written and produced by the Okidata Sales and Product Training
Please address any comments on this publication to:
Sales and Product Training
Okidata
532 Fellowship Road
Mount Laurel, NJ 08054-3499
Fax Number: (609) 222-5320
Okilink Login Name: Technical Training
OKIDATA is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki
Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd.
MICROLINE is a registered trademark of Oki Electric Industry Company, Ltd.; marque depose de Oki
Electric Industry Company, Ltd.
Centronics is a registered trademark of Centronics Inc.
PLUG 'n PRINT is a registered trademark of Oki America, Inc.; marque deposee de Oki America, Inc.
Epson is a registered trademark of Seiko Epson Corporation.
IBM, Proprinter and Proprinter XL are registered trademarks of International Business Machines, Inc.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 3
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.1 OVERVIEW
1.1.01 General Information
The Microline 393-Plus and Microline 393C-Plus are high speed, dot matrix printers, which utilize a 24 pin
printhead.
The Microline 393-Plus is the standard version (monochrome).
The Microline 393C-Plus is the color capable version.
The printers are capable of emulating the Epson LQ-2550 and the IBM Proprinter XL24 printers.
Both an RS232-C Serial Interface and a Centronics Parallel Interface are standard.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 4
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.2 PHYSICAL SPECIFICATIONS
1.2.01 Dimensions
NOTE: Dimensions INCLUDE the platen knob, acoustic cover, and paper separator.
Width: 25.2 inches (54 centimeters)
Depth: 19 inches (48.3 centimeters)
Height: 8 inches (20.3 centimeters)
1.2.02 Printer Weight
37 pounds (16.8 kilograms)
UPS Shippable
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Page: 5
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.3 POWER REQUIREMENTS
1.3.01 Input Power
120 VAC: +10 / -15%
220 VAC: +10 / -15%
1.3.02 Power Consumption
Operating: 180 VA
Idle: 50 VA
1.3.03 Power Frequency
50/60 Hz +/- 2%
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Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 6
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.4 ENVIRONMENTAL CONDITIONS
1.4.01 Acoustic Rating
Letter Quality Mode
58 dBA
Quiet Mode
54 dBA
1.4.02 Altitude
10,000 feet (3,048 meters)
1.4.03 Ambient Temperature and Relative Humidity (RH)
While operating: 41 to 104 degrees Fahrenheit (5 to 40 degrees Celsius)
Operating humidity: 20% to 90% RH
While in storage: -40 to 158 degrees Fahrenheit ( - 40 to 70 degrees Celsius)
Storage humidity: 5% to 95% RH
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.5 AGENCY APPROVALS
1.5.01 Listings
UL No: UL Standard No. 478
CSA No: CSA Standard C22.2 (220)
FCC: FCC Class B
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Page: 8
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6 OPERATIONAL SPECIFICATIONS
1.6.01 Character Matrix Sizes
Table of Print Speed and Character Matrix
Mode
Speed
Matrix (Horizontal x Vertical) @ cpi
Letter Quality
140 cps
30 x 18 @ 12 cpi
Near Letter Quality
210 cps
15 x 18 @ 12 cpi
Utility
415 cps
9 x 17 @ 12 cpi
High Speed Draft
520 cps
7 x 17 @ 15 cpi
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.02 Characters Per Line
Characters Per Line
Characters Per Inch (Maximum)
136
10
163
12
204
15
233
17.1
272
20
PS
-
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.03 Character Pitches
10, 12, 15, 17.1, 20
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.04 Character Sets
Standard ASCII
EPSON Character Set I & II
IBM Character Set I, II & All Characters
16 Foreign Language Sets
Zero / Slashed Zero
DLL - 2 Sets of 128 characters
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Page: 12
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.05 Emulations
NOTE: The emulations are co-resident
Epson LQ
IBM XL24
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Page: 13
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.06 Fonts
Standard
Courier
Swiss
Roman
Orator
Optional Font Cartridges
Prestige
Letter Gothic
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Page: 14
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.07 Front Panel Switches
SELECT Paper Park / Top of Form
Quiet (Menu) Mode Font Selection
Line Feed Pitch Selection
FORM FEED Print Quality Selection
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Page: 15
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.08 Graphics Resolution
60 (horizontal) x 60 (vertical) dots per inch (DPI) minimum
360 (horizontal) x 360 (vertical) dots per inch (DPI) maximum
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.09 Interface
Standard
Centronics Parallel
19.2K Super-Speed Serial RS232C
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Page: 17
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.10 Line Feed Increments
Fixed
6 lines per inch (lpi) [0.167 inch (4.23 millimeters)]
8 lines per inch (lpi) [0.125 inch (3.175 millimeters)]
Variable
n/60 inch
n/72 inch
n/180 inch
n/216 inch
n/360 inch
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Page: 18
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.11 Line Feed Time
55 ms @ 6 LPI
8.0 IPS (inches per second) slew rate @ gap 1,2
6.0 IPS (inches per second) slew rate @ gap 3+
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.12 Menu Mode
Switch
Action
Print
Prints the entire menu.
Group
Selects Group Function
Item
Selects Item
Set
Selects Item Value
Exit
Exits Menu Mode Enters Select
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Page: 20
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.13 Paper Feed Methods
Standard
Friction Feed (Top)
Rear Push Tractor (Rear)
Optional
Pull Tractor (Bottom)
Cut Sheet Feeder (Top)
CSF 30001 - Single Bin
CSF 30002 - Dual Bin
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Page: 21
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.14 Paper Feed Paths
Top Feed (Standard)
Rear Feed (Standard)
Bottom Feed (by using an Optional feed mechanism)
Special Features
Paper Park
Forms Tear Off
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Page: 22
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.15 Paper Loading
Refer to the Setup Guide or Section 2.2
loading.
of this Service Handbook for information on paper
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Page: 23
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.16 Paper Out Detection
Distance from end of paper
Rear Feed: 2.3 inches (5.84 centimeters)
Bottom Feed: .94 inches (2.388 centimeters)
Cut Sheet: .93 inches (2.362 centimeters)
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.17 Paper Tear Capabilities
Tear Bar (for Forms Tear-Off)
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Page: 25
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.18 Print Method
Printhead Type
General Information
Impact: Dot Matrix
24 pin printhead
.0078 inch (0.20 millimeter) diameter pins
Overheat Protection
When printhead temperature reaches 115 to 125 degrees Celsius, the printer stops bi-directional printing.
Uni-directional printing begins.
If the temperature exceeds 125 degrees Celsius, printing stops.
Printing will resume when the printhead temperature drops below 115 degrees Celsius.
NOTE: Refer to Section Two for more information on printhead operation
.
Printhead Gap Information
Two items factor into printhead gap information.
1. Printhead Gap Adjustment
This is a SERVICE ADJUSTMENT made by a technician.
It is covered in Section 3.3
of this Service Handbook.
The Adjustment measures 0.017, +/- 0.001 inches (0.43, +/- 0.03 mm).
2. Printhead Gap Adjust
This is a manual adjustment performed by the end-user.
It is performed by moving the blue head gap lever, located on the right side of the printer.
The settings are 1, 2, 3, 4, 5, 6, 7, 8, 9
1 is the smallest (narrowest) gap.
9 is the largest (widest) gap.
Setting
Paper Type
1
12 - 15 lb. paper
2
20 - 24 lb. paper
3-4
Labels
3-4
Two-part forms
4-5
Three-part forms
7
Four-part forms
5-9
Envelopes
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Page: 26
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.19 Print Modes
Letter Quality
Near Letter Quality
Utility
High Speed Draft
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Page: 27
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.6.20 Print Speed
Pitch
Head Gap
Setting
10 cpi
High Speed
Draft
Utility
Near Letter
Quality
Letter Quality
1,2
345 cps
172 cps
115 cps
12 cpi
1,2
414 cps
207 cps
138 cps
15 cpi
1,2
517 cps
258 cps
172 cps
17.1 cpi
1,2
517 cps
295 cps
196 cps
20 cpi
1,2
345 cps
230 cps
10 cpi
3+
300 cps
150 cps
100 cps
12 cpi
3+
360 cps
180 cps
120 cps
15 cpi
3+
450 cps
225 cps
150 cps
17.1 cpi
3+
450 cps
257 cps
171 cps
20 cpi
3+
300 cps
200 cps
cpi - Characters Per Inch
cps - Characters Per Second
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Page: 28
Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.7 PAPER SPECIFICATIONS
CAUTION:
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
1.7.01 Types
Card Stock
Weight: 100 lbs. (375 g/m 2 ) Maximum
Width: 5 to 14 inches (12.7 to 35.6 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: .014 inches (0.36 millimeters)
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6
Continuous Form
Weight:
Single Part 12 - 24 lb. (45 to 90 g/m 2 )
Multi-Part, Carbonless 9 - 11 lb. (35 to 40 g/m 2 )
Multi-Part, Interleaf Paper 10 - 12 lb. (38 to 45 g/m 2 ) Carbon 9 lb. (35 g/m 2 )
Width: 3.5 to 15.5 inches (8.8 to 41.9 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: 0.014 inches (0.36 millimeters) maximum
Paper Feed Path: Rear or Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6
Cut Sheet
Weight: 12 to 24 lbs. (45 to 90 g/m 2 )
Width: 7.2 to 16 inches (18.3 to 40.6 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: 0.002 to .0049 inches (0.5 to 0.12 millimeters)
Paper Feed Path: Top
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Envelopes
Weight: 24 lbs. (90 g/m 2 ) Maximum
Size:
Single Feed
Minimum: 6.5 x 3.6 inches (16.5 x 9.1 centimeters)
Maximum: 9.5 x 4.1 inches (24.1 x 10.4 centimeters)
Continuous
Non-overlap type
Thickness: .014 inches (.325 millimeters) Maximum
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Labels
Weight: N/A
Width: 3.5 to 15.5 inches (8.8 to 41.9 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: .011 inches (0.28 mm) Maximum (including backing)
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
CAUTION:
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
Transparency
NOTE:
Roller marks may mar the transparency under high temperature / high humidity conditions.
Weight: 12 to 24 lbs. (45 to 90 g/m 2 )
Width: 7.2 to 16 inches (18.2 to 40.6 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: 0.14 inches (0.36 millimeters) maximum
Paper Feed Path: Top
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
1.7.02 Length
NOTE:
The recommended length is specific to paper type. Rear Feed
Minimum 3 inches (7.62 centimeters)
Maximum 17 inches (43.18 centimeters)
Bottom Feed
Minimum 3 inches (7.62 centimeters)
Maximum 17 inches (43.18 centimeters)
Top Feed
Minimum 3 inches (7.62 centimeters)
Maximum 17 inches (43.18 centimeters)
1.7.03 Number of Copies
Original + 3 Interleaf
Original + 3 Carbonless
Original Cut Sheet
1.7.04 Thickness
0.014 inches / 0.36 mm Maximum
1.7.05 Weight
NOTE:
The recommended weight is specific to paper type. Minimum: 12 lb. (45 g/m 2 )
Maximum: 100 lb. (375 g/m 2 )
1.7.06 Width
NOTE:
The recommended width is specific to paper type.
Paper
Minimum: 3.5 inches ( 8.8 centimeters)
Maximum: 16 inches (40.6 centimeters)
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.8 MEMORY SPECIFICATIONS
1.8.01 ROM
128 Kbytes Resident Program ROM
384 Kbytes Resident Fonts
64 Kbytes each Optional Font Cartridges
1.8.02 RAM
Total RAM = 64 Kbytes
Print Buffer 23 Kbytes
Epson I/F Buffer 8 Kbytes
IBM I/F Buffer 0 Kbytes (minimum)
DLL Buffer 0 to 32 Kbytes
1.8.03 EEPROM
Internal Control, Menu = 256 bits
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.9 CONSUMABLES
1.9.01 Black Ribbon Cartridge
Microline 393-Plus and Microline 393C-Plus
Type: Fabric Ribbon
Ribbon Life: 5 million characters
1.9.02 Color Ribbon Cartridge
Microline 393C-Plus
Type: Four band color ribbon (Yellow, Magenta, Cyan, Black)
Ribbon Life:
Black: 2.3 million characters
Cyan: 1.8 million characters
Magenta: 1.8 million characters
Yellow: 1.3 million characters
1.9.03 Film Ribbon
Can be used in both the Microline 393-Plus and Microline 393C-Plus.
Ribbon Life
400K Characters at 10 cpi in letter quality mode
CAUTION:
Using a non-Okidata ribbon may damage the printhead and void any warranties.
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.10 OPTIONS
1.10.01 Cut Sheet Feeders
Single Bin, CSF 30001
Single Bin with envelope capability
Paper Width: 7.2 to 8.5 inches (18.3 to 21.7 centimeters)
Paper Length: 10.1 to 14 inches (25.7 to 35.6 centimeters)
Capacity: 170 sheets (16 lb.), 100 sheets (24 lb.)
Dual Bin, CSF 3002
Dual Bin with envelope capability
Paper Width: 7.2 to 8.5 inches (18.3 to 21.7 centimeters)
Paper Length: 10.1 to 14 inches (25.6 to 35.6 centimeters)
Capacity: 170 sheets (16 lb.), 100 sheets (24 lb.)
1.10.02 Pull Tractor Kit
NOTES:
A Pull Tractor Assembly MUST be used to feed labels.
The Pull Tractor Assembly is required for bottom feeding.
Bottom Feed
Rear Feed (For Push/Pull Operation)
Paper Types: Continuous Feed and Labels
1.10.03 RAM Buffer Expansion Card
32 kbytes
1.10.04 Font Cartridges
Prestige
Gothic
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Service Guide ML393/ML393CPlus
Chapter 1 Specifications
1.11 RELIABILITY
1.11.01 Mean Time Before Failure (MTBF)
Approximately 4,000 hours: 25% duty cycle / 35% page density
1.11.02 Mean Time To Repair (MTTR)
Approximately 15 minutes to major sub-assembly level
1.11.03 Printer Life
Approximately 12,000 hours of power-on time: 25% duty cycle / 35% page density
1.11.04 Printhead Life
Average 200 million characters in 10 cpi utility mode @ normal 25% duty, 35% page density
1.11.05 Ribbon Life
Approximately 4 million characters
1.11.06 Warranty (Limited)
One year, parts, labor, and printhead
1.11.07 Service
Authorized Okidata Service Centers
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1 ELECTRICAL OPERATION
2.1.01 General Information
The Control Board consists of the microprocessor and its peripheral circuits, the drive circuits. The power
to the Control Board is supplied by the power supply unit. The power to the other electrical parts is
distributed via the connectors on the Control Board.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.02 Microprocessors (MPUs) and Peripheral Circuits
Microprocessors (Q16: 83C154UGS and Q11: 80C154VGS)
The Microprocessors are the nucleus of the control circuit. The peripheral circuits operate under program
control by these microprocessors. The Master MPU (Q16) controls the interface, code processing and the
Slave MPU. The Slave MPU (Q11) controls the spacing and printing functions.
Program ROM for Master MPU (Q6: 27512)
This Program ROM contains the control program for the printer. The master microprocessor operates by
execution of this program.
Program ROM for Slave MPU (Q17: 2764)
This Program ROM contains the control program for the printer. The slave microprocessor operates by
execution of this program.
DRAM (Q18 and Q19)
The Dynamic RAM chips, each consisting of 64x4 Kbits, are used as the Receive Buffer and Print Buffer.
The total buffer size is 64x8 Kbits.
CGROM (Q7)
This is a 1 Mbit ROM which stores the resident character fonts.
EEPROM (Q20)
This 256-bit serial Electrically Erasable and Programmable ROM stores the menu data.
Motor Control LSI (Q9: MSM6990)
This LSI controls the functions listed below.
Space Motor Speed Control
To obtain the carriage speed instructed by the Microprocessor, the LSI generates the pulse switch timing
and overdrive time
Dot ON Timing generation
I/O Port (Input port used to read Operator Panel switches)
Address Latch (for lower 8 bits of the slave MPU)
LSI (Q8: MSM74H002)
This LSI drives the 24 pin printhead. The following describes the function of the LSI.
Printhead Drive Control
Printhead Drive Correction
Modifies the drive time under the following circumstances
Correction for edge pin driving
Correction for drive voltage fluctuations
Correction for head gap setting
Interface LSI (Q12: MSM60306)
The MSM60306 is an external interface LSI and controls the following functions.
Interface Control
Controls both the parallel and serial interface functions
Pin 4 of this LSI enables selection of the serial or parallel interface
Address Latch (for lower 8 bits of the master MPU)
MMU (Memory Management Unit) LSI (Q13: MSM73003)
This LSI is connected between the Master and Slave MPUs and performs these functions.
LED Drive Output Port
Master/Slave MPU Interface
Transfers commands and data between the Master and Slave MPUs
Memory Control
Extends the addressable memory by switching banks in/out
Dynamic RAM Refresh
Block Diagram of Microline 393 / 393C-Plus
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.03 Initialization
The printer is initialized whenever the power is turned ON or when the I-PRIME signal is received at the
parallel interface. Initialization is started when the RST-P signal is sent from the reset circuit to the MPUs
and LSIs.
When RST-P is generated, ROM program execution starts with the mode setting of Q8, Q9, Q12 and Q13.
Next, ROM and RAM are checked for errors, RAM is initialized and the carriage, bail and ribbon (color
model only) are homed. The program finally establishes the interface signals (output level of ACK, BUSY,
etc.), then turns the SELECT lamp ON to inform the host computer that the printer is ready to receive
data.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.04 Interface Control
The printer is capable of serial or parallel operation. The desired interface method is selected by sliding
the interface cover to expose the desired connector. When this is done, the interface select switch is
turned ON or OFF to inform the Interface Control LSI (Q12) of the selected interface.
Parallel Interface
When the interface select switch is turned OFF, the parallel interface is selected and the Interface Control
LSI is in the parallel mode.
The data from the interface is received through connector (CN-1) and the Interface LSI (Q12) latches this
data to the internal register in the LSI at the rising edge of the STB-N signal.
The BUSY signal is turned ON as the data is processed. When processing is completed, the BUSY signal
is turned OFF and an ACK signal is sent to the host to request more data.
The BUSY signal is also turned ON when the printer is not able to receive data (buffer is full, printer is
deselected or an error condition exists).
RS232-C Serial Interface
When the interface select switch is turned ON, the serial interface is selected and the Interface Control LSI
is in the serial mode.
Then the RS232-C interface signals (DSR, CTS, CD and RD) are converted to TTL levels by the line
receiver (Q2) and input to the Master MPU, Slave MPU and MMU. The Master MPU converts the serial
data to parallel data.
The interface signals (DTR, RTS, SSD and TD) output from the Master MPU and Interface LSI are
converted from TTL levels to RS232-C levels by the line driver (Q2) and sent to the serial interface
connector.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.05 Printhead Drive Circuit
This circuit is used to drive the twenty-four (24) print wires.
The signals HD1 through HD24 control the individual print wires. The HD ON signal (even/odd trigger)
enables the drive circuit when printing is desired.
The head drive duration is determined by an RC integrating circuit, which modifies the HD ON pulse width.
The pulse width of the HD ON signal varies with the number of pins being driven.
Printhead Drive Time
The drive time increases as more pins are driven.
The drive time decreases as less pins are driven.
The drive time also increases if the head gap lever is placed in positions 4 through 9.
An RC circuit is also used to compensate for the fluctuation of drive voltage (+38 vdc).2-1-04B.pcx
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.06 Spacing Drive Circuit
The Motor Control LSI (Q9) outputs the SPMO DA signal upon receiving the spacing command from the
Slave MPU (Q11). This is a fixed cycle pulse signal.
To control the motor speed, the Motor Control LSI varies the pulse duty cycle according to the speed data
from the Slave MPU.
The SPMO FOW or SPMO REV signal from the Head Control LSI (Q8) changes the current direction in
the DC motor to run the motor in either the forward or reverse direction.
As the space motor rotates, it generates feedback pulse signals SP Phase A and SP Phase B. The Motor
Control LSI detects the edge pulses from these signals and divides the frequency to output the MO LSI
IPT signal for use in Dot Timing.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.07 Line Feed Circuit
The Line Feed Motor Shaft is held stationary by +8 vdc supplied according to the pulse duty cycle of the
LFCHOP signal (the holding current is approximately 30 ma) whenever in a stopped position.
During line feed operation, the Line Feed Motor is driven by +38 vdc in accordance with the LFOVDV-N
signal. The signals LF Phase 1 through LF Phase 4 establish the proper phase relationship for driving the
motor.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.08 Alarm Circuits
Fault Alarm Circuit (in Power Supply Unit)
This protective circuit turns off the Power Supply when a fault occurs in the printhead, line feed, or
bail/ribbon motor drive circuits, thus preventing secondary component failure.
To accomplish this, the circuit monitors the overdrive signal of each drive circuit. If the duration of any
drive circuit exceeds a predetermined length of time, the appropriate signal (HDE ALM, HDO ALM, LF
COM or RBN COM) will be sent to the fault alarm circuit. The fault alarm circuit generates the ALM signal
(high) which causes the power supply to turn all DC power OFF.
Printhead Overheat Alarm Circuit
In order to protect the printhead coils, this circuit monitors the printhead temperature by using a thermistor
contained in the printhead. The CPU senses this circuit every time a line is printed.
When printing, the printhead temperature rises. If the head temperature reaches approximately 115 to 125
degrees Celsius, a head overheat condition (ALARM 1) is generated.
When ALARM 1 is detected, bi-directional printing stops. Uni-directional printing continues.
If the printhead temperature continues to rise, ALARM 2 is generated. All printing stops.
Printing resumes when the head temperature falls below the ALARM 1 level.
Cover Open Alarm Circuit
When the front access cover is opened, the COVOPEN-N signal is sent to the Slave MPU from the cover
interlock microswitch. The Slave MPU relays the switch status to the Master MPU. The Master MPU will
halt printing at the completion of the current line and light the ALARM Lamp.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.09 Paper End Detection Circuit
Whenever the Release Lever is in the Continuous Feed position, Paper End is detected by the
microswitch on the Push Tractor (rear feed) or the Paper End sensor on the sensor board (bottom feed).
Whenever the Release Lever is in the Sheet Feed position, Paper End is detected by a photosensor
located in the paper pressure guide.
When the printer detects an out of paper condition, the PE-N signal goes low. Printing stops. The ALARM
LAMP is turned ON.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.10 Power Supply
This switching power supply converts the AC input voltage to +5 vdc, +/-8 vdc and +38 vdc for use
throughout the printer.
Voltage / Signal Table
Voltage/Signal
Purpose
+5 vdc
IC Logic Levels - LED Drive Voltage
+8 vdc
Serial Interface Logic Levels - Line Feed Motor Locking
Voltage
-8 vdc
Serial Interface Logic Levels
+38 vdc
Printhead Space Motor Line Feed Motor Bail/Ribbon
Motor Drive Voltage
POW ALM
This signal is sent by the Power Supply in the event of
an abnormal temperature rise in the power supply unit or
an overcurrent condition of the +38 vdc. The Main
Control Board suppresses this condition by temporarily
suspending printing. If the condition does not change
the Main Control Board will enable the FAN ALARM
(Alarm 60) Refer to Section 4 of this Service Handbook.
ALM
This signal is sent by the Main Control Board when an of
an overdrive condition is detected in either the printhead
line feed motor or bail/ribbon motor drive circuits. The
power supply disables the + 38 vdc output when this
signal is detected.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2 MECHANICAL OPERATION
2.2.01 Printhead Mechanism
The printer uses a highly efficient stored energy type printhead. Power is not consumed until the printwires
are activated. This extends printhead life to approximately 200 million characters.
The printhead uses 24 printwires (two columns of 12 wires each). Each wire is welded to an armature.
Behind this armature is a spacer ring.
Each of the 24 printwire armatures have a permanent magnet behind them. The magnets attract the
armatures, drawing the printwires into the wire guide. This keeps the wires inside the printhead. A coil is
wrapped around each of the permanent magnets.
When a dot is to be printed, current passes through the appropriate coil. This creates an electromagnetic
field which opposes the magnetic field of the permanent magnet. The armature springs forward. The print
wire (which is attached to the armature) strikes the ribbon and prints a dot on the paper.
When current is removed from the coil, the magnetic field of the permanent magnet attracts the armature,
retracting the printwire into the wire guide.
The printhead contains a built-in thermistor used to monitor the printhead temperature.
The parts listed below make up the printhead.
Wire Guide
Print Wires
Armature Assembly
Spacer
Permanent Magnet Assembly
Thermistor
Printed Circuit Board with Coils
Head Gap Adjusting
The head gap adjusting mechanism adjusts the gap between the platen and printhead.
Move the adjusting lever on the left side of the printer mechanism to change the head gap.
When the lever is moved, the carriage shaft rotates. The carriage shaft is attached to the printer
mechanism with eccentric collars. As the carriage shaft rotates, the distance between the platen and
carriage shaft changes.
Two items factor into printhead gap information.
1. Printhead Gap Adjustment
This is a SERVICE ADJUSTMENT made by a technician.
It is covered in Section 3.3
of this Service Handbook.
The Adjustment measures 0.017, +/- 0.001 inches (0.43, +/- 0.03 mm).
2. Printhead Gap Adjust
This is a manual adjustment performed by the end-user.
It is performed by moving the blue head gap lever, located on the right side of the printer.
The settings are 1, 2, 3, 4, 5, 6, 7, 8, 9
1 is the smallest (narrowest) gap.
9 is the largest (widest) gap.
Setting
Paper Type
1
12 - 15 lb. paper
2
20 - 24 lb. paper
3-4
Labels
3-4
Two-part forms
4-5
Three-part forms
7
Four-part forms
5-9
Envelopes
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.02 Spacing
Spacing is performed when the space motor drives the carriage along the carriage shaft, parallel to the
platen. The spacing mechanism consists of the items listed below.
Space Motor
Drive Pulley
Idle Pulley
Carriage Shaft
Carriage Frame
Space Belt
Spacing Operation
The carriage containing the printhead moves parallel to the platen along the main carriage shaft. Power
from the space motor is transferred via the space belt, which is attached to the bottom of the carriage
frame. The carriage is designed to move 0.8 inches when the servo motor performs one rotation.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.03 Ribbon Drive
The ribbon drive mechanism moves the ribbon in synchronization with the space motor operation.
The ribbon drive mechanism consists of the items listed below.
Ribbon Drive Assembly
Ribbon Cartridge
Ribbon Cartridge
An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built-in to
the ribbon cartridge.
Ribbon Feed Operation
The rotation of the space motor is transmitted to the drive gear in the ribbon cartridge through the ribbon
feed gear assembly. This feeds the ink ribbon.
The feed direction of the ribbon is maintained by switching the rotational direction of the gears in the
ribbon drive assembly. This ensures uni-directional ribbon movement when bi-directional printing is used.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.04 Paper Feed
Paper feeding is performed by turning the platen and the pin tractor, which is driven by the line feed pulse
motor.
The paper feed mechanism consists of the items listed below.
Pulse Motor (with gears)
Idler Gear
Change Spring
Change Gear
Platen
Tractor Feed Unit
Paper Pressure Guide
Friction Feed
When the release lever is set to the SHEET FEED position, the change gear is disengaged from the
tractor gear. At the same time, the release lever applies pressure to push the pressure rollers against the
platen, allowing paper to be fed.
Tractor Feed
When the release lever is set to the TRACTOR FEED position, the release lever allows the reset spring to
push the change gear toward the tractor gear. At the same time, the release lever pushes the pressure
rollers away from the platen, allowing paper to be fed by the tractors.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.05 Paper-End Detection
Cut-Sheet Paper-End
When the release lever is in the SHEET FEED position, the photosensor located in the paper pressure
guide is active. If sheet paper is installed, the paper is detected by the sensor and the sensor is activated
(ON). When the printer is out of sheet paper, the sensor is deactivated (OFF), indicating a paper-end
condition.
Bottom Feed Paper-End
This is used with optional Pull Tractor.
When the release lever is in the TRACTOR FEED position, the switch on the left push tractor and the
paper-end sensor on the sensor board are active. If paper is detected by either of these sensors,
paper-end is inhibited.
When bottom feed paper is installed, it moves the bottom paper-end lever to turn the sensor ON. When a
paper out condition exists, the lever blocks the sensor, indicating a paper-end condition.
Rear Feed Paper-End
When the release lever is in the TRACTOR FEED position, the switch on the left push tractor and the
paper-end sensor on the sensor board are active. If paper is detected by either of these sensors,
paper-end is inhibited.
When rear feed paper is installed, pressure is placed on the microswitch, located in the left push tractor.
Since the switch is turned ON, paper is detected.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.06 Paper Park
General Information
Paper park allows the user to switch from continuous feed paper to single-sheet paper without removing
the continuous feed paper from the printer. The continuous feed paper will be retracted from the platen
and down into the printer housing without disengaging it from the built-in tractor.
After a single-sheet paper is printed, pull the bail lever forward and the continuous feed paper will move
back into the print position.
Paper park cannot be used when the optional pull tractor is installed.
The operation of the Paper Park feature is listed below.
Press PARK/TOF.
Reverse line feed retracts the paper until a paper-end condition exists or until 14 inches of paper has been
retracted. The paper will remain on the push tractor, but out of the printing path.
Procedure: Continuous Feed to Single Sheet
1. Tear off any printed pages.
2. Make sure the printer is selected. The SELECT lamp must be lit.
3. Press PARK / TOF.
4. The paper will retract from the paper path.
5. Move the paper selection to the single sheet position (towards the back of the printer).
6. Raise the paper support to its upright position.
7. Align the left paper guide with the paper icon on the support.
8. Place a piece of paper in the paper support.
9. Position the right paper guide to accommodate the right edge of paper.
10. Press FORM FEED to feed single-sheet paper into the printer.
11. Print the single sheet.
Procedure: Single Sheet to Continuous Feed
1. Remove any single-sheet paper in the printer.
2. Move the paper selection lever to the continuous form position (to the front of the printer).
3. Lower the paper support.
4. Press FORM FEED to feed continuous feed paper into the printer.
5. The paper will advance to the loading position.
6. Adjust the top of form (if necessary).
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.07 Automatic Paper Loading
Automatic Paper Loading is used to consistently set the print start position when using cut-sheet or
continuous sheet paper. The procedure is listed below.
Cut-Sheet Paper
1. Push the Paper Release Lever to the Cut-Sheet position.
2. Insert the paper from behind the platen.
3. Press the FORM FEED switch.
4. The Paper Bail will automatically open.
5. The Line Feed operation will load the paper.
6. The Paper Bail will automatically close.
NOTE:
If the paper does not move, the Auto-Load motion becomes invalid and is treated like an ordinary
paper-end.
Continuous Sheet (Rear Feed) SASF
1. Push the Paper Release Lever to the Continuous Sheet side (front of printer).
2. Insert the paper into the push tractor. DO NOT allow the front edge of the paper to extend beyond the
white line of the left tractor assembly. The white guide line MUST BE visible.
3. Press the FORM FEED switch.
4. The Paper Bail will automatically open.
5. The Line Feed operation will load the paper.
6. The Paper Bail will automatically close.
NOTE:
If the paper does not advance after the line feed motor has fed the equivalent of 2.4 inches of paper, the
Auto-Load process stops. This situation is treated like an ordinary paper-end condition.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.1 MAINTENANCE
3.1.01 General Information
This section lists the parts replacement, adjustment, cleaning, lubrication, and shipping procedures.
Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a
malfunctioning unit until you have followed the failure analysis procedures in Section Four of this Service
Handbook.
Follow the procedures listed in Adjustments and Service Settings. Adjustments may be required when
either consumables or parts are replaced. Failure to perform these procedures could result in
unnecessary service calls.
Cleaning procedures must be performed correctly if high print quality is to be achieved.
3.1.02 Maintenance Items
The following items are required to service the unit.
Disassembly / Adjustments
#1 Phillips Screwdriver (with magnetic tip)
#2 Phillips Screwdriver (with magnetic tip)
#3 Phillips Screwdriver (with magnetic tip)
Straight-slot Screwdriver
Needle Nose Pliers (4 inch)
Diagonal Cutters
Tension Gauge (capable of measuring 1 pound of pressure)
7 mm open-ended wrench
Ruler (capable of measuring 1/16 inch increments)
3/32 inch socket with driver
Feeler Gauge
Digital Multimeter
Cleaning / Lubrication
Shop Vacuum
Cloth (soft and lint-free)
All-Purpose Cleaner
Platen Cleaner
Contact Kleen (Okidata P/N 51802301)
Machine Grease
Machine Oil
3.1.03 Maintenance Precautions
1. Do not disassemble the unit if it is operating normally.
2. Before starting disassembly and assembly, always power OFF the unit and detach the AC power cord.
3. Detach the interface cable, if installed.
4. Do not remove parts unnecessarily. Try to keep disassembly to a minimum.
5. Use the recommended maintenance tools.
6. When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in
damaged parts.
7. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the
original positions.
8. Use extreme care when handling circuit boards. Integrated circuits (microprocessors, ROM, and RAM)
can be destroyed by static electricity.
9. Do not place printed circuit boards directly on conductive surfaces.
10. Follow the recommended procedures when replacing assemblies and units.
11. When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS.
Replacement printed circuit boards are shipped WITHOUT these items.
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD)
safety precautions or you may damage the components.
12. Perform the line feed belt tension adjustment when any of the following occur.
Erratic line spacing occurs
Parts are replaced
Line Feed Belt (3.2.09
).
13. Perform the color adjustment when any of the following occur.
Colors "bleed" into one another
Parts are replaced
Ribbon Shift Cam and Ribbon Shift Gear (3.2.27
Ribbon Shift Cam Lever Assembly (3.2.28
)
)
14. Perform the printhead gap adjustment procedure (Refer to Section 3.3 of this Service
Handbook ) when any of the following occur.
Poor Print Quality
Uneven Print Quality (darker on one side of the document).
Excessive wear on the printhead or platen
Parts are replaced
Printhead (3.2.01
)
Platen Assembly (3.2.09
)
Space Motor Assembly (3.2.14
)
Carriage Shaft (3.2.18
)
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2 DISASSEMBLY/ASSEMBLY PROCEDURES
General Information
This section contains the printer disassembly procedures. Only the removal procedures are explained
here. Reverse the procedure for the installation.
At the bottom of each procedure is a listing of the parts covered in that procedure. The Okidata part
number, item description, comment (RSPL, Option, Consumable) and cross-reference to Appendix B is
provided for each part. Items included in the Recommended Spare Parts List are indicated by the acronym
RSPL. N/A will appear where a part number is not available.
Part Item Comment Appendix B Number Description Reference
This Service Handbook lists the disassembly procedures for major components of the unit. Okidata DOES
NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly
during this training, Okidata recommends that you perform only the disassembly procedures for RSPL
items. All other procedures are provided to assist you in identifying parts. It is not likely that you will
perform these procedures while servicing the unit.
Be sure to read all notes, cautions, and warnings, as they contain important information regarding
disassembly / assembly.
Microline 393C-Plus Only (Color Version)
3.2.23 Ribbon Shift Arm and Shift Arm Spring
3.2.24 Roller Lever
3.2.25 Ribbon Guide
3.2.26 Bail Open Cam and Bail Open Gear
3.2.27 Ribbon Shift Cam and Ribbon Shift Gear
3.2.28 Ribbon Shift Cam Lever Assembly
Cut Sheet Feeder - Option
3.2.29 Friction Sheet
3.2.30 Rear Bin
3.2.31 Side Cover
3.2.32 Roller Supports and Rollers (H)
3.2.33 Control Board
3.2.34 Connection Cord
3.2.35 Motor Assembly
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.01 Preliminary Items, Printhead
WARNING:
The printhead will be HOT immediately after printing.
1. Power OFF the printer and detach the AC power cord (1).
2. Detach the interface cable, if installed. [Not Shown]
3. Open the printer access cover.
4. Remove the ribbon cartridge (2).
5. Place the head gap adjusting lever (3) to the range 9 position.
6. Remove the two mounting screws (4).
7. Lift the printhead (5) from the connector to remove it.
NOTE: When installing the printhead, pull the printhead towards the stopper (in the direction of Arrow A).
Perform the printhead gap adjustment after installation. Refer to Section 3.3 of this Service Handbook for
further information.
P/N 56609701 Cord: AC Power (120 vac) RSPL B.2.03
P/N 56624101 Cable: AC 220V (ML) Right Ang RSPL B.2.03
P/N 70000803 Kit: Parallel Interface Plug n Play Option B.2.14
Accessory (Cable)
P/N 70012801 Kit: RS232-C Serial Interface Cable Option B.2.14
P/N 52103801 Cartridge: Film Ribbon (Black) Consumable B.2.04
, B.2.17
P/N 52103601 Cartridge: Ribbon (Black) Consumable B.2.04
, B.2.17
P/N 52103701 Cartridge: Ribbon (Color) Consumable B.2.04
, B.2.17
P/N 50054202 Printhead: (Mylar Comp) RSPL B.2.03
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.02 Ribbon Guide
1. Remove the printhead (3.2.01
).
2. Remove the two mounting screws (1).
3. Lift the ribbon guide (2) and remove it.
P/N 53055901 Guide: Ribbon (Black) RSPL B.2.12
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.03 Ribbon Protector
1. Remove the printhead (3.2.01
).
2. Remove the ribbon guide (3.2.02
).
3. Remove the two mounting screws (1).
4. Lift the ribbon protector (2) and remove it.
P/N 53527001 Protector: Ribbon RSPL B.2.12
, B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.04 Upper Cover Assembly
Procedure
1. Disconnect the interface cable (1).
2. Remove the font cartridge or buffer expansion cartridge (2) if installed.
3. Detach the two platen knobs (3).
4. Remove the two cover mounting screws (4) at the rear of the printer.
5. Lift the rear access cover (5) to the open position.
6. Lift the upper cover assembly at the back and tilt it towards the front to remove it.
NOTES:
When installing the upper cover assembly, perform the actions listed below.
Move the release lever (6) towards the front of the printer.
Move the bail arm lever (7) towards the back of the printer.
Check that the paper bail moves properly.
When cleaning, refer to Section 3.4 of this Service Handbook.
The upper cover assembly includes the middle cover, the access cover, the rear cover, the bail lever, the
paper separator, and the sheet insertion guide. Refer to Appendix B of this Service Handbook for details.
The parts list appears on the following pages.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Parts List
P/N 70000803 Kit: Parallel Interface Plug n Play Option B.2.14 Accessory (Cable)
P/N 70012801 Kit: RS232-C Serial Interface Cable Option B.2.14
P/N 70010201 Gothic Font Cartridge Option B.2.03
P/N 70010101 Prestige Font Cartridge Option B.2.03
, B.2.14
, B.2.14
P/N 70016401 Cartridge: 32 Kbyte RAM Expansion Option B.2.03
P/N 53478601 Knob: Platen RSPL B.2.03
P/N 50212427 Cover: Middle (ML393+) RSPL B.2.02
P/N 50212426 Cover: Middle (ML393C+) RSPL B.2.02
P/N 50212306 Cover: Access (Monochrome) RSPL B.2.02
P/N 50212307 Cover: Access (Color) RSPL B.2.02
P/N 50212504 Cover: Rear RSPL B.2.02
P/N 53482901 Lever: Bail B.2.02
, B.2.04
P/N 51001901 Separator: Paper B.2.02
P/N 53482801 Guide: Sheet Insertion B.2.02
, B.2.14
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.05 Operator Panel Assembly
1. Remove the upper cover assembly (3.2.04
).
2. Disconnect the operator panel cable (1) from CN10 (2) on the control board.
3. Remove the two mounting screws (3).
4. Detach the operator panel holder (4) by moving it upward, and then pulling toward the front of the
printer.
5. Remove the three mounting screws (5).
6. Open the eleven claws and detach the operator panel (6) from the operator panel holder.
P/N 55050601 PCB: Operator Panel (LQSX) RSPL B.2.05
P/N 53479103 Panel: Operator RSPL B.2.05
P/N 56614608 Cable: Operator Panel RSPL B.2.05
P/N 50910505 Spring: Cover Open RSPL B.2.05
P/N 56614301 Cable: Microswitch (Cover Open) RSPL B.2.05
P/N 53535301 Lever: Cover Open B.2.05
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.06 Control Board (LQEM)
1. Remove the upper cover assembly (3.2.04
).
2. Remove the ribbon cartridge.
3. Release the lock of connector CN10 (1) and detach the operator panel cable (2).
4. Remove the five shield cover mounting screws (3).
5. While slightly lifting the shield cover (4), detach connector CN13 (5) from the control board (6), then
remove the shield cover.
6. Detach the remaining connectors from the control board.
7. Loosen the mounting screw and remove the control board.
NOTES:
Installation
Do not allow cables to get caught under the control board.
Insert the control board into the groove in the base tray (7).
Place the board into the groove (8) in the shield cover, then attach the shield cover.
When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS.
Replacement printed circuit boards are shipped WITHOUT these items.
This board has a 2.0 Amp, 125V fuse.
If SP1 is OPEN, an Internal ROM is present. If SP1 is SHORTED - External ROM
SP3 must be OPEN for a Monochrome Model. It must be SHORTED for a Color Model.
CAUTION:
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD)
safety precautions or you may damage the components.
P/N 55050411 PCB: Main (LQEM-1) Black RSPL B.2.03
P/N 55050412 PCB: Main (LQEM-2) Color RSPL B.2.04
P/N 56619201 Cord: I/F Main PCB Connection (50 Pin) RSPL B.2.03
P/N 55938501 IC: EEPROM BR93CS46-2-NW RSPL B.2.04
P/N 56301703 Fuse: 2A, 125V B.2.04
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.07 Interface Connector Board (LQPN)
NOTE:
To allow easier access to the mounting screw and cables, configure the interface connector board to use
the serial interface connector.
1. Remove the upper cover assembly (3.2.04
).
2. Disconnect connectors CN102 (1) and CN103 (2).
3. Remove the two mounting screws (3).
4. Lift the interface connector board (4).
5. Detach connector CN101 (5).
6. Remove the interface connector board.
NOTE:
After assembly, configure the interface connector board (if necessary).
P/N 55034501 PCB: LQPN-Interface Connection RSPL B.2.03 [Assembly]
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.08 Printer Mechanism
1. Remove the upper cover assembly (3.2.04
2. Remove the control board (3.2.06
).
).
3. Detach connectors CN102 (1) and CN103 (2) from the interface connector board.
4. Remove the three mounting screws (3) at the rear of the printer mechanism (4).
5. Remove the three mounting screws and brackets (5). There are two on the left side of the printer
mechanism and one on the right side.
CAUTION:
Do not grasp the ribbon cartridge bracket, paper chute, or the guide shaft of the sheet feeder assembly
when lifting the printer during the next step. These parts are easily bent.
6. While holding the base tray, lift the printer mechanism and remove it.
NOTE:
When assembling the printer, do not allow cables to get caught under the control board.
P/N 50213301 Frame: Base B.2.08
, B.2.11
P/N 50512923 Rubber Grommet (in base) B.2.08
, B.2.11
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.09 Platen Assembly
1. Remove the upper cover assembly (3.2.04
).
2. Loosen the three 7 mm line feed motor mounting bolts (1).
3. Move the line feed motor (2) closer to the platen (3) and detach the line feed mini-pitch belt (4).
4. Remove the snap (5A), washer (5B), idle gear spring (5C) and idle gear (5D).
5. Remove the screw (6) and detach the gear pulley (6A), washer (6B), and platen bearing (6C).
6. Remove the screw (7) and detach the platen gear A (7A) and platen bearing (7B).
7. Push in the platen lever (8), lift the bail, and remove the platen assembly (3).
NOTE:
Perform the line feed belt tension adjustment (3.3.02) after replacing the line feed drive belt.
When cleaning, refer to Section 3.4 of this Service Handbook.
Perform the printhead gap adjustment after installation. Refer to Section 3.3 of this Service Handbook for
further information.
P/N 50054101 Platen: (Assembly) RSPL B.2.06
, B.2.09
P/N 51302790 Belt: Mini Pitch (Line Feed) RSPL B.2.06
P/N 50705603 Snap B.2.08
P/N 54123804 Washer B.2.08
, B.2.09
, B.2.11
, B.2.11
P/N 50910305 Spring: Idle Gear RSPL B.2.07
, B.2.10
P/N 51214401 Gear: Idle (Release Lever) RSPL B.2.07
P/N 51215001 Pulley: Platen RSPL B.2.06
P/N 51214501 Gear: Platen - A RSPL B.2.06
P/N 51605001 Bearing: Platen B.2.08
, B.2.09
, B.2.09
, B.2.11
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.10 Line Feed Motor
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.09
).
).
3. Remove the three mounting bolts and washers (1).
4. Remove the line feed motor (2).
NOTE:
When installing the line feed motor, the cable should be positioned toward the top.
Adjust the line feed belt tension (3.3.0 2
) after installing the line feed motor.
P/N 56508401 Motor: Line Feed Assembly RSPL B.2.06
, 09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.11 Printhead Cable Assembly
1. Detach the printhead (3.2.01
).
2. Remove the upper cover assembly (3.2.04
3. Remove the printer mechanism (3.2.09
).
).
4. Work from the bottom of the printer mechanism and loosen the two mounting screws (1).
5. Detach tabs (A) and (B) from the frame and remove the cable holder (2).
6. Remove the left shoulder screw [color] (3A) and right should screw [color] (3B).
7. Detach the cartridge bracket (4).
8. Remove the mounting screw (5)
9. Detach the connector clamp (6).
10. Detach the head cable connector (7) from the carriage frame (8).
11. Lift the front of the printer mechanism and remove the printhead cable assembly by pulling downward.
NOTE:
The ribbon cartridge balance spring is NOT shown. Refer to Appendix B of this Service Handbook for
further information.
P/N 50312103 Screw: Shoulder Left (Color) RSPL B.2.10
P/N 50312106 Screw: Shoulder Right (Color) RSPL B.2.10
P/N N/A Cartridge Bracket
P/N N/A Clamp B.2.12
, B2.13
P/N 56614201 Cable: Printhead Assembly RSPL B.2.12
, B2.13
P/N 50910601 Spring: Ribbon Cartridge Balance (Color) RSPL B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.12 Sensor Board
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.09
).
).
3. Raise the front of the printer mechanism.
4. Disconnect cables CN2 (1) and CN3 (2) from the sensor board (3).
5. Remove the three sensor board mounting screws (4).
6. Disconnect connector CN1 (5) and detach the sensor board.
P/N 55050501 PCB: Sensor (LQEW or LPRW) RSPL B.2.06
P/N 55050502 PCB: Sensor (LQEW-2) (Color) RSPL B.2.10
P/N 56619101 Cable: Sensor Board Connection RSPL B.2.06
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.13 Ribbon Feed Assembly
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.08
).
).
3. Remove the left shoulder screw [color] (1A) and right should screw [color] (1B).
4. Detach the cartridge bracket (2).
5. Remove the two mounting screws (3).
6. Detach the ribbon feed assembly (4).
NOTE:
When assembling, install the ribbon drive assembly so that the gear teeth contact properly (5). The gears
must not bind together.
The ribbon cartridge balance spring is NOT shown. Refer to Appendix B of this Service Handbook for
further information.
P/N 50312103 Screw: Shoulder Left (Color) RSPL B.2.10
P/N 50312106 Screw: Shoulder Right (Color) RSPL B.2.10
P/N N/A Cartridge Bracket
P/N 50054301 Assembly: Ribbon Feed RSPL B.2.07
, B.2.10
P/N 50910601 Spring: Ribbon Cartridge Balance (Color) RSPL B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.14 Space Motor Assembly
1. Remove the printhead (3.2.01
).
2. Remove the upper cover assembly (3.2.04
3. Remove the ribbon feed assembly (3.2.13
).
).
4. Loosen the two belt pulley bracket mounting screws (1).
5. While pushing the belt pulley bracket (2) to the left, temporarily tighten the two screws. This will ease
the tension on the space belt.
6. Remove the three space motor mounting screws (3).
7. Remove the space motor (4) by pulling it toward the front of the printer.
NOTE:
Perform the printhead gap adjustment after installation. Refer to Section 3.3 of this Service Handbook for
further information.
P/N 56506201 Motor: Space Assembly RSPL B.2.06
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.15 Space Belt
1. Remove the printhead (3.2.01
).
2. Remove the upper cover assembly (3.2.04
3. Remove the head cable assembly (3.2.11
4. Remove the space motor assembly (3.2.14
).
).
).
5. Remove the mounting screw (1).
6. Detach the belt clamp (2).
7. Remove the idle pulley (3) from the idle pulley shaft (4) and detach the mini-pitch space belt (5).
NOTE:
When installing the belt clamp, make sure that the ribbed side is facing up as shown.
P/N 50702301 Clamp: Belt RSPL B.2.12
P/N 51215601 Pulley: Idle B.2.08
, B.2.13
, B2.11
P/N 53327801 Shaft: Idle Pulley B.2.08
, B2.11
P/N 51303101 Belt: Mini Pitch (Space) RSPL B.2.12
, B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.16 Bail/Ribbon Motor Assembly
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.09
).
).
3. Disconnect connector CN2 (1).
4. Remove the two mounting screws (2).
5. Detach the bail/ribbon motor assembly (3).
NOTE:
When assembling, install the bail/ribbon motor assembly so that the gear teeth contact properly. The
gears must not bind together.
P/N 56506301 Motor: Step (Bail Arm) Assembly RSPL B.2.07
, B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.17 Paper Bail Assembly
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.08
).
).
3. Remove the bail/ribbon motor assembly (3.2.16
).
4. Detach the left bail arm spring (1A) and right bail arm spring (1B).
5. Remove the bail arm idle gear (2).
6. Detach the E snap ring and remove the bail open cam (3).
7. Detach the E snap ring (4) and remove the left bail arm (5) from the indicator shaft assembly (6) by
pulling to the left.
8. Remove the right bail arm (7) by pulling to the right while expanding the clamps (8).
9. Detach the right bail arm from the indicator shaft assembly.
NOTE:
Installation
The left bail arm spring (1A) is longer than the right bail arm spring (1B). Be sure to install each spring on
the proper side.
P/N 50910701 Spring: Bail Arm (Left) RSPL B.2.07
, B.2.10
P/N 50910801 Spring: Bail Arm (Right) RSPL B.2.07
P/N 51210201 Gear: Idle (Bail Arm) RSPL B.2.07
, B.2.10
, B.2.10
P/N 51214701 Cam: Bail Open (Black) RSPL B.2.07
P/N 53478501 Arm: Left Bail RSPL B.2.07
, B.2.10
P/N 50054401 Assembly: Indicator Shaft RSPL B.2.07
P/N 53478502 Arm: Right Bail RSPL B.2.07
, B.2.10
, B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.18 Carriage and Carriage Shaft
Procedure
1. Remove the printhead (3.2.01
).
2. Remove the upper cover assembly (3.2.04
).
3. Loosen the screw (1) and slide it towards the back of the printer. This screw affects the placement of
the slide guide (1A).
4. Loosen the mounting screw (2) and detach the left eccentric collar (3).
5. Remove the screw and detach the blue printhead gap adjusting lever. (Not shown)
6. Loosen the screw (4) and detach the right eccentric collar (5).
7. Remove the two stopper cushion rings (6).
8. Slide the carriage shaft (7) to the right and remove the carriage (8) and round spacer (Not Shown).
9. Continue sliding the carriage shaft to the right, then remove the carriage shaft.
NOTE:
Installation
The protrusions on the eccentric collars face the outside of the printer.
The long extension end of the carriage shaft goes to the right side of the printer.
The printhead gap adjust lever is NOT shown. Refer to Appendix B of this Service Handbook for further
information.
When cleaning, refer to Section 3.4 of this Service Handbook
.
Perform the printhead gap adjustment after installation. Refer to Section 3.3
Handbook for further information.
The parts list appears on the following pages.
of this Service
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Parts List
P/N 51005501 Guide: Slide B.2.12
, B.2.13
P/N 50703701 Collar: Eccentric (Carr. Rail) B.2.08
, B.2.11
P/N 53478401 Lever: Printhead Gap Adjust RSPL B.2.07
P/N 50705701 Ring: Cushion (Stopper) B.2.08
P/N 51110301 Shaft: Carriage B.2.08
Head Adjustment
, B.2.10
, B.2.11
, B.2.11
P/N 50057601 Carriage: Black Assembly B.2.12
P/N 50069401 Carriage: Color Assembly , B.2.13
P/N N/A Spacer: Round B.2.12
, B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.19 Paper Pressure Guide
1. Remove the printhead (3.2.01
).
2. Remove the upper cover assembly (3.2.04
).
3. Remove the two paper chute springs (1) located on each side of the paper chute assembly (2).
4. Loosen the two screws, located under the post on the left side of the printer mechanism. [ Not Shown]
5. Remove the release lever detent spring (3), located on the release lever (4) at the right side of the
printer.
6. Separate the claws and remove the release lever (4).
7. Remove the release lever guide block. (Not Shown. Refer to Appendix B of this Service Handbook.)
8. Remove the paper pressure bar (5) by sliding it to the right.
9. Using needle-nose pliers, squeeze the nylon latch (7A) to release the cut-sheet paper-end sensor (7B),
which is located at the left side of the printer mechanism.
10. Lift and remove the paper chute assembly.
11. This is the rear guide (7).
NOTE:
Installation
The flat side of the paper pressure bar faces up.
P/N 50907502 Spring: (Paper Chute) RSPL B.2.06
P/N 50082001 Assembly: Paper Chute B.2.08
, B.2.09
, B.2.11
P/N 50910201 Spring: Detent (Release Lever) RSPL B.2.07
P/N 53478706 Lever: Release RSPL RSPL B.2.06
, B.2.09
P/N 53478801 Block: Release Lever Guide RSPL B.2.08
P/N N/A Paper Pressure Bar B.2.08
, B.2.11
, B.2.11
, B.2.11
P/N 55034801 Sensor: Cut-Sheet Paper-End RSPL B.2.07
P/N N/A Rear Guide B.2.08
, B.2.09
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.20 Printhead Gap / Release Lever Microswitches
1. Remove the upper cover assembly (3.2.04
).
2. Remove the mounting screw to remove the adjust and release lever micro switch (1).
3. Push down on the mounting tab and remove the printhead gap microswitch (2).
4. Using a needle nose pliers, detach the nylon cable clamp (3) and remove the harness and switches
from the printer mechanism.
5. The printhead gap indication bracket is the plastic piece imprinted with numbers. [Not Shown]
P/N 56209901 Switch: Micro (Adj and Rel Lever) RSPL B.2.06
P/N 53063801 Bracket: PH Gap Indication RSPL B.2.07
, B.2.09
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.21 Push Tractor Assembly
Procedure - Disassembly
1. Remove the upper cover assembly (3.2.04
).
2. Remove the lower center guide A(1A) and lower center guide B (1B).
3. Separate the claws (2) and remove the drive gear A (3A) and drive gear B (3B) from the right side of the
printer mechanism. Drive gear B contacts the bushing.
4. Using a needle nose pliers, remove the nylon cable clamp (4).
5. Slide the upper drive shaft (5) to the left and remove it.
6. Slide the lower drive shaft (6) to the left.
7. Remove the upper center guide (7), being careful not to lose the friction piece (8).
8. Remove the lower drive shaft (6).
9. Loosen the two screws (9) [one is located on each side of the printer mechanism].
10. Lift and remove the left push tractor assembly (10A), the right push tractor assembly (10B), and the
locking shaft (11).
11. To remove the tractors from the locking shaft, raise the lock lever and slide the tractor off.
Installation Notes appear on the following pages.
The parts list appears on the following pages.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Procedure - Installation Notes
NOTES:
When installing the push tractor assembly, follow the precautions listed below.
1. Install the friction piece in the upper center guide. If the upper center guide moves easily along the
locking shaft, use a standard screwdriver to rotate the friction piece 45 degrees (12).
2. Check the installation; if the guide moves with difficulty, it is properly installed.
3. Synchronize the tractors by aligning the synchronization marks in the same direction.
4. Position the guide holes (13) in the tractor drive gears in the same direction.
5. Position the groove of the upper center guide (7) behind the paper pressure guide (14).
6. The left tractor assembly (10A) must be positioned between the two locking tabs (15).
Parts List
P/N 51002501 Guide: Center Lower - A RSPL B.2.06
, B.2.09
P/N 51002601 Guide: Center Lower - B RSPL B.2.06
, B.2.09
P/N 51214201 Gear: Drive - A RSPL B.2.07
, B.2.10
P/N 51214301 Gear: Drive - B RSPL B.2.07
, B.2.10
P/N 51605101 Bushing B.2.08
, B.2.11
P/N N/A Shaft: Upper Drive B.2.08
, B.2.11
P/N N/A Shaft: Lower Drive B.2.08
, B.2.11
P/N 51002401 Guide: Center Upper RSPL B.2.06
P/N 51002301 Friction: Piece RSPL B.2.06
, B.2.09
, B.2.09
P/N 50054501 Tractor: Push (Left) Assembly RSPL B.2.06
P/N 50054601 Tractor: Push (Right) Assembly RSPL B.2.06
P/N N/A Shaft: Locking B.2.08
, B.2.11
, B.2.09
, B.2.09
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.22 Power Supply Unit
1. Remove the printer mechanism (3.2.08
).
2. Disconnect the two cables (1) from the left side of the power supply unit (2).
3. Remove the four power supply mounting screws (3).
4. Remove the power supply unit by pulling toward the left-front side of the printer. You must raise the
power supply unit slightly so it will become detached from the two guides (A) in the lower cover.
NOTE:
Be careful not to damage the cables with the power supply unit mounting bracket (located at the left/rear
of the power supply unit).
P/N 56406202 Power Supply Assembly (220 vac) RSPL B.2.03
P/N 56411201 Power Supply Assembly (120 vac) RSPL B.2.03
P/N 56406301 Power Supply (220 v) Option B.2.14
P/N 56614101 Cord: Power Connection (9 Pin) RSPL B.2.03
P/N 56614801 Cord: Power Connection (13 Pin) RSPL B.2.03
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Sections 3.2.23 through 3.2.28 apply to the Microline 393C-Plus - Color Model Only
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Microline 393C-Plus - Color Model Only
3.2.23 Ribbon Shift Arm Spring / Ribbon Shift Arm
1. Detach the printer access cover.
2. Remove the ribbon cartridge (1).
3. Remove the shift arm spring (2).
4. Remove the 7 mm mounting bolt (3) and detach the ribbon shift arm (4).
P/N 53478901 Arm: Ribbon Shift (Color) RSPL B.2.13
P/N 50315401 Screw (Color) RSPL B.2.13
P/N 50917811 Spring: Ribbon Shift Arm (Color) RSPL B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.24 Roller Lever
1. Open the printer access cover.
2. Remove the ribbon cartridge.
3. Remove the shift arm spring (3.2.23
).
4. Remove the two 7 mm bolts (1) and detach the roller lever (2).
P/N 53479001 Lever: Roller (Color) RSPL B.2.13
P/N N/A Screw B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.25 Ribbon Guide
1. Remove the printhead (3.2.01
)..
2. Loosen the 7 mm ribbon shift arm mounting bolt (1) and detach the ribbon shift arm (2) from projection
A of the ribbon guide (3).
3. Remove the two printhead mounting screws.
4. Lift the printhead from the printer. As you lift the printhead, the ribbon guide can be removed.
P/N 53056002 Guide: Ribbon (Color) RSPL B.2.13
P/N 50605701 Post: Ribbon Guide (Color) RSPL B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.26 Bail Open Cam and Bail Open Gear
1. Remove the printer mechanism (3.2.08
).
2. Detach the E snap ring (1).
3. Remove the bail open gear (2).
4. Remove the bail open cam (3).
5. Remove the plastic ring (4).
Caution:
Installation
When installing, make sure that the plastic ring is positioned against the rim on the bail open cam.
Installation may be easier if the bail open cam is installed on the shaft first, followed by the bail open gear.
Press down on the spring (5) slightly when installing the cam and ring.
The plastic ring MUST rest against the spring.
P/N 50911001 Spring: Brake - B (Color) RSPL B.2.10
P/N 51222601 Cam: Bail Open (Color) RSPL B.2.10
P/N 51214601 Gear: Bail Open (Color) RSPL B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.27 Ribbon Shift Cam and Ribbon Shift Gear
1. Remove the printer mechanism (3.2.08
).
2. Detach the E snap ring (1).
3. Remove the ribbon shift gear (2).
4. Remove the washer.
5. Remove the ribbon shift cam (3).
NOTE:
Installation
Hold back the spring (4) while pushing the gear and cam on the shaft.
Place the roller (5) in the groove (6) of the ribbon shift cam.
Perform the color adjustment. Refer to Section 3.3
of this Service Handbook.
P/N 50910901 Spring: Brake - A RSPL B.2.10 B.2.10
P/N 51222501 Cam: Ribbon Shift (Color) RSPL B.2.10 B.2.10
P/N 51215101 Gear: Ribbon Shift (Color) RSPL B.2.10 B.2.10
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.28 Ribbon Shift Cam Lever Assembly
1. Remove the printer mechanism (3.2.08
).
2. Remove the ribbon shift cam and ribbon shift gear (3.2.27
).
3. Remove the mounting screw (1)
4. Detach the ribbon shift cam lever (2) from the cartridge bracket (3).
NOTE:
Installation
Perform the color adjustment. Refer to Section 3.3 of
P/N 50054701 Lever: Shift Cam (Color) RSPL B.2.10
fthis Service Handbook.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Sections 3.2.29 through 3.2.35 apply to the CUT
SHEET FEEDER - OPTION
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.29 Friction Sheet
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Remove the sheet supporter (1).
4. Move the paper lock lever (2) towards the back.
5. Remove the friction sheets (5) from the sheet guide A (3) and sheet guide B (4).
NOTE:
Installation
When installing new friction sheets, remove the peel-off backing.
Place the sheets on the sheet guides.
P/N 70010601 Cut Sheet Feeder 3001 Single Bin Option B.2.14
P/N 70010701 Cut Sheet Feeder 3002 Dual Bin Option B.2.14
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.30 Rear Bin
6. Power OFF the printer.
7. Remove the cut sheet feeder.
8. Remove the front sheet supporter (1).
9. Remove the rear sheet supporter (2).
10. Use a screwdriver (5) to push the lock levers (6) in the direction of arrow A. The levers are inside the
left side cover (3) and right side cover (4) of the rear-bin unit (10).
11. Move the rear-bin unit (11) in the direction of arrow D to disengage the lock plate (8) from the post (7)
on the front bin unit (10).
12. Lift the rear-bin unit (11) in the direction of arrow C and pull in the direction of arrow D to disengage
the lock plate (8) from the post (9) on the front bin unit (10). The rear-bin unit (11) will disengage from the
front-bin unit (10).
NOTE:
Installation
Engaging the front-bin unit to the rear-bin unit.
Keep the lock plate (8) on the post (9).
Press the rear-bin unit (11) against the front-bin unit (10).
The lock lever (6) will engage with the post (7).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.31 Side Cover
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Disengage the rear-bin unit from the front-bin unit (3.2.30
4. Remove the three screws (1).
5. Remove the bolt (2).
6. Remove the collar (3).
7. Remove the left side cover (4) of the front-bin unit.
8. Remove the three screws (5).
9. Remove the bolt (6).
10. Remove the collar (7).
11. Remove the right side cover (8) of the front-bin unit.
12. Remove the two screws (9).
13. Remove the bolt (10).
14. Remove the collar (11).
15. Remove the left side cover (12) of the rear-bin unit.
16. Remove the two screws (13).
17. Remove the bolt (14).
18. Remove the collar (15).
19. Remove the left side cover (16) of the rear-bin unit.
).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.32 Roller Supports and Rollers (H)
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Disengage the rear-bin unit from the front-bin unit (3.2.30
).
4. Remove the left and right side covers from the front and rear bin units (3.2.31
).
5. Remove the three screws (2).
6. Slide the control board (3) in the direction of arrow A. [Single-bin units ONLY]
7. Remove the E-shaped snap ring (4).
8. Pull the hopper shaft (5) in the direction of arrow B.
9. Remove the left roller support (6).
10. Remove the right roller support (7).
11. Remove the roller H (8). The collar (9) will also be removed at the same time.
12. Remove the rollers H (8) from the left roller support (6) and the right roller support (7).
NOTE:
Installation
When installing the roller support bearings, be sure to install the blue side on the right and the white side
on the left.
When installing the hopper shaft (5), fit the flanges of the left roller support (8) and right roller support (7)
into the grooves of the sheet guide A (10) and sheet guide B (11).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.33 Control Board
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Disengage the rear-bin unit from the front-bin unit (3.2.30
).
4. Remove the left side cover from the front bin unit (3.2.31
).
5. Disconnect connectors CN1 (1) and CN2 (2).
6. Remove the three screws (3).
7. Remove the two screws (4).
8. Remove the control board (5).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.34 Connection Cord
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Disengage the rear-bin unit from the front-bin unit (3.2.30
).
4. Remove the left side cover from the front bin unit (3.2.31
).
5. Disconnect connector CN1 (2) from the control board (1).
6. Remove the three screws (3).
7. Remove the control board (1).
8. Cut the tie wrap (4).
9. Remove the connection cord (6) from the post (5).
NOTE:
Installation
Use a new tie wrap when installing the connection cord.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.35 Motor Assembly
1. Power OFF the printer.
2. Remove the cut sheet feeder.
3. Disengage the rear-bin unit from the front-bin unit (3.2.30
).
4. Remove the left and right side covers from the front bin unit (3.2.31
5. Remove the control board (3.2.33
).
).
6. Remove the four screws (1).
7. Remove the right sheet guide assembly (2).
8. Pull out the connection cord (4) from the groove (A) in the side frame (3).
9. Unbend the three cable clamps (5) to release the connection cord (4).
10. Remove the two screws (6).
11. Remove the motor assembly (7).
12. Remove the idle gear (8).
NOTE:
Installation
Use a new tie wrap when installing the connection cord.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3 PRINTER ADJUSTMENTS
3.3.01 General Information
This section contains the procedures for performing adjustments on the printer. These procedures may be
required when replacing either consumables or parts. The disassembly/assembly procedures list the
required adjustments and refer you to this section. Failure to perform these procedures may result in
unnecessary service calls.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.02 Printhead Gap Adjustment
General Information
Before performing this adjustment, always verify that the printhead is properly installed.
Perform the printhead gap adjustment procedure when any of the following occur.
Poor Print Quality
Uneven Print Quality (darker on one side of the document).
Excessive wear on the printhead or platen
Parts are replaced
Printhead (3.2.01
)
Platen Assembly (3.2.09
)
Space Motor Assembly (3.2.14
Carriage Shaft (3.2.18
)
)
NOTE:
Place a new ribbon cartridge in the printer before testing.
Procedure
1. Remove the printhead (3.2.01
)
2. Remove the ribbon guide (3.2.02
).
3. Remove the ribbon protector (3.2.03
).
4. Install the printhead.
5. Set the printhead gap lever to position 1.
6. Set the paper release lever to the OPEN position.
7. Loosen the left and right eccentric collar setscrews.
STEP A
8. Place the printhead at the left side of the platen.
9. Rotate the left adjusting collar until you obtain a .017" (+/- .001") gap between the printhead and the
platen.
10. Place the printhead at the right side of the platen.
11. Rotate the right adjusting collar until you obtain a .017" (+/- .001") gap between the printhead and the
platen.
12. When the correct gap has been attained, tighten the left and right eccentric collar setscrews.
13. Check the gap at the left side, center and right side of the platen. If the printhead gap is not within
specification, go to STEP A.
14. Remove the printhead.
15. Install the ribbon protector, ribbon guide and printhead.
CAUTION:
Be sure to pull the printhead toward the stopper whenever it is installed.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.03 Line Feed Belt Tension
General Information
Perform the line feed belt tension adjustment when any of the following occur.
Erratic line spacing occurs
Parts are replaced
Line Feed Belt (3.2.09
).
Procedure
1. Rotate the platen pulley at least once before making the adjustment
2. Loosen the three line feed motor mounting bolts (1).
3. Using a tension gauge, apply .5 pound of pressure at point A.
4. Adjust the line feed motor (2) position to obtain a 1 /16 inch deflection at point B.
5. Tighten the three mounting bolts.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.04 Color Adjustment (Microline 393C-Plus Printer)
General Information
Perform the color adjustment when any of the following occur.
Colors "bleed" into one another
Parts are replaced
Ribbon Shift Cam and Ribbon Shift Gear (3.2.27
Ribbon Shift Cam Lever Assembly (3.2.28
)
)
Procedure: Ribbon Home Adjustment
1. Remove the upper cover assembly (3.2.04
2. Remove the printer mechanism (3.2.08
).
).
3. Rotate the ribbon shift cam (1) so the ribbon guide (2) is at the top of the post (3).
4. The gap from the end face of the ribbon sensor (4) to the shift cam lever (5) must be .020 inches.
5. If adjustment is necessary, loosen the shift cam lever mounting screw (6) and position the lever to
obtain the desired clearance.
6. Check that the ribbon guide remained at the top of the post. If it moved, repeat the procedure.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.05 Key Combinations
Key Combination
Function
SELECT + FORM FEED (Hold during
power ON)
Activates Hexadecimal Dump Mode
SELECT + PARK/TOF (Hold during power
ON)
Resets Printer Menu to factory defaults
LINE FEED (Hold during power ON)
Activate Font Test To end Font Test press
SELECT
QUIET (Press with printer deselected /
OFF-LINE)
Activate Menu To exit press SELECT
PARK/TOF (Hold during power ON)
Activate Rolling ASCII Test To end Rolling
ASCII Test press SELECT
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.06 Menu Operation
General Information
The menu is used to customize the printers settings and features.
The Menu is made up of a number of Groups.
Each Group has a list of Items.
Each Item has several Settings.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Menu Mode
CAUTION:
If the Menu is set for wide paper, and narrow paper is used, the printhead will print on the platen. This
could damage / destroy the printhead, platen, and ribbon.
To place the printer in the Menu Mode, follow this procedure.
1. Verify that continuous feed paper is installed.
2. Verify that the ribbon is correctly installed.
3. Verify that the width of the installed paper matches the paper width menu setting.
4. Press SELECT and place the printer OFF-LINE (SELECT will NOT be lit).
5. Press QUIET to enter Menu Mode.
6. The line shown below will print.
Font Print Quality LQ
7. Go to Step A to print the current menu.
Go to Step B to change the menu.
Step A
Press PRINT to print the current Menu.
Press EXIT to exit Menu Mode.
The printer will go ON-LINE. (SELECT will light.)
Step B
When the printer is in Menu Mode, the functions shown below the switches on the operator panel are
active.
Press GROUP to move through the groups of the Menu. A line prints, showing the Group.
Press ITEM to move through the items in a group. A line prints, showing the Item.
Press SET to change the setting for an item. A line prints, showing the Setting.
Press EXIT to save any changes and exit Menu Mode.
The printer will go ON-LINE. (SELECT will light.)
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Menu Print
1. Verify that paper and the ribbon are installed.
2. Power ON the printer.
3. Press SELECT and place the printer OFF-LINE (SELECT will not be lit).
4. Press QUIET to enter Menu Mode.
5. The line shown below will print.
Font Print Quality LQ
6. Press PRINT to print the current Menu.
7. Press EXIT to save any changes and exit Menu Mode.
8. The printer will go ON-LINE. (SELECT will light.)
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Sample Menu
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Menu Settings
Factory default settings are printed in Bold Italic.
Group
Item
Setting
Font
Print Quality
LQ NLQ Utility HSD
Typestyle
Courier Roman Helvette Orator
Cartridge DLL
Pitch
10 cpi 12 cpi 15 cpi 17.1 cpi 20
cpi Proportional
Style
Normal Italics
Size
Single Double Triple
Smoothing
No Yes
Emulation Mode
Epson LQ IBM PPR IBM X24
AGM
Graphics
Bi-directional uni-directional
Paper Out Override
No Yes
Print Registration
+5 +4 +3 +2 +1 0 -1 -2 -3 -4
-5
Operator Panel Functions
Full Operation Limited Operation
Page Width
13.6" 8"
Ribbon Selection
Microline 393C-Plus Black Yellow
Magenta Cyan Violet Orange
Green
General Control
Microline 393-Plus Black Ribbon
Film Ribbon
Reset Inhibit
Valid Invalid
Paper / Transparency
Paper Transparency
Factory default settings are printed in Bold Italic.
Group
Item
Setting
Line Spacing
6 LPI 8 LPI
Form Tear Off
Off 300 mS 1 sec 2 sec
Skip Over Perforation
No Yes
Auto LF
No Yes
Auto CR
No Yes
Page Length
3" 3.5" 4" 5.5" 6" 7" 8" 8.5" 11" 11
2/3" 12 14" 17"
Character Set
IBM Set I IBM Set II Epson
Language Set
American French German British
Danish I Swedish Italian Spanish I
Japanese Norwegian Danish II
Spanish II Latin American French
Canadian Dutch Publisher
Zero Character
Slashed Unslashed
Max. Receive Buffer
1 Line 8 K 23 K 40 K (Optional)
Print Suppress Effective
No Yes
Auto Feed XT
Invalid Valid
Serial Interface
Parity
None Odd Even
(Appears ONLY
when
Serial Data 7/8 Bits
8 Bits 7 Bits
serial interface is in
use)
Protocol
Ready / Busy X-ON / X-OFF
Diagnostic Test
Yes No
Busy Line
SSD- SSSD+ DTR RTS
Baud Rate
19200 bps 9600 bps 4800 bps 2400
bps 1200 bps 600 bps 300 bps
DSR Signal
Valid Invalid
DTR Signal
Ready on Power UP Ready on Select
Busy Time
200 mS 1 sec
Vertical Control
Symbol Sets
General Interface
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Menu Reset
CAUTION:
Once the menu has been reset, all customized menu settings WILL BE LOST.
ALWAYS print the menu BEFORE resetting the printer to factory defaults.
To reset the menu to factory default settings, follow this procedure.
1. Print the Menu.
When the menu is reset, ALL customized settings ARE LOST.
Printing the Menu provides a reference of customized settings.
2. Power OFF the printer.
3. Press SELECT and TOF while powering ON the printer.
4. The Menu is reset to Factory Defaults.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Limited Operation
General Information
The Operator Panel Functions Item in the Printer Menu can be set to either Full Operation or Limited
Operation. If the printer is part of a customized system or if it is used by different operators, a system
manager may be using this feature to maintain proper print settings.
FONT, PRINT QUALITY, and CHARACTER PITCH (on the operator panel) do not work when the printer
is set for Limited Operation.
Procedure
CAUTION:
Check with the system manager BEFORE changing the setting for the operator panel function!
1. Verify that paper is loaded and that the ribbon is installed.
2. Power OFF the printer.
3. Press and hold QUIET while powering ON the printer.
4. Press GROUP until GENERAL CONTROL prints.
5. Press ITEM until OPERATOR PANEL FUNCTIONS prints.
6. Press SET until FULL OPERATION prints.
7. Press EXIT to save any changes and exit Menu Mode.
8. The printer will go ON-LINE. (SELECT will light.)
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.07 Top of Form
General Information
Top of form is the distance from the top edge of the paper to the first print position on the page.
The red line on the ribbon protector indicates the baseline of the Top of Form.
When the printer advances paper to the next page, it stops at the top of form.
Procedure: Setting Top of Form
1. Load paper into the printer by pressing FORM FEED.
2. Press SELECT until the printer is OFF-LINE. (SELECT will NOT be lit).
3. The red line on the plastic ribbon protector indicates the base of the printing line. Use this red line as a
guide.
4. Press and hold PARK while pressing one of the two switches listed below.
FORM FEED advances the paper. The space used for the Top of Form increases.
LINE FEED retracts the paper. The space used for the Top of Form decreases.
5. Release PARK.
6. Press SELECT and place the printer ON-LINE. (SELECT will be lit).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.08 Paper Park
General Information
Paper park allows the user to switch from continuous feed paper to single-sheet paper without removing
the continuous feed paper from the printer. The continuous feed paper will be retracted from the platen
and down into the printer housing without disengaging it from the built-in tractor.
After a single-sheet paper is printed, pull the bail lever forward and the continuous feed paper will move
back into the print position.
Paper park cannot be used when the optional pull tractor is installed.
Procedure: Continuous Feed to Single Sheet
1. Tear off any printed pages.
2. Make sure the printer is selected. The SELECT lamp must be lit.
3. Press PARK / TOF.
4. The paper will retract from the paper path.
5. Move the paper selection to the single sheet position (towards the back of the printer).
6. Raise the paper support to its upright position.
7. Align the left paper guide with the paper icon on the support.
8. Place a piece of paper in the paper support.
9. Position the right paper guide to accomodate the right edge of paper.
10. Press FORM FEED to feed single-sheet paper into the printer.
11. Print the single sheet.
Procedure: Single Sheet to Continuous Feed
1. Remove any single-sheet paper in the printer.
2. Move the paper selection lever to the continuous form position (to the front of the printer).
3. Lower the paper support.
4. Press FORM FEED to feed continuous feed paper into the printer.
5. The paper will advance to the loading position.
6. Adjust the top of form (if necessary).
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.09 Forms Tear Off
General Information
This feature (when activated) will automatically advance continuous feed paper to the tear-off position
after it finishes printing the last page in the document. A few seconds after printing stops, the printer will
move the paper up to the tear-off position, aligning the perforation with the serrated edge on the access
cover. The operator will be able to tear off the last printed page without wasting paper or adjusting the
printer. When the printer receives data to print, it will automatically return the paper to the top of form
position for printing.
Forms Tear Off can only be used with continuous feed paper fed in from the rear on the built-in push
tractor. It CANNOT be used with the optional pull tractor.
NOTES:
Some programs, such as high resolution graphics packages, pause occasionally while sending data to the
printer.
If the pause lasts more than the selected interval, the paper will advance to the tear-off position until more
data is received.
No data is lost, but the extra paper movement causes uneven print registration.
If this problem occurs, disable (set to OFF) the Menu Setting for Forms Tear Off.
Procedure
1. Load continuous feed paper into the printer.
2. Verify that the ribbon is installed.
3. Power ON the printer.
4. Verify that the printer is ON-LINE (SELECT lamp is lit).
5. Press SELECT and place the printer OFF-LINE (SELECT will not be lit).
6. Press QUIET to enter Menu Mode.
7. The line shown below will print.
Font Print Quality <current setting>
8. Press GROUP until the following line is printed.
Vertical Control Emulation Mode <current setting>
9. Press ITEM until the following line is printed.
Vertical Control Form Tear Off <current setting>
10. Press SET to change the menu setting for Form Tear Off.
To activate Form Tear Off, the setting must be 300 mS, 1 sec., or 2 sec.
To deactivate Forms Tear Off, the setting must be OFF.
11. Press EXIT to save any changes and exit Menu Mode.
12. The printer will go ON-LINE. (SELECT will light.)
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Page: 107
Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.3.10 Resets
Menu Reset
CAUTION:
Print the menu before retting it to factory defaults.
When the menu is reset, ALL customized settings ARE LOST.
Printing the Menu provides a reference of customized settings.
If the Menu is set for wide paper, and narrow paper is used, the printhead will print on the platen. This
could damage / destroy the printhead, platen, and ribbon.
To reset place the printer in the Menu Mode, follow this procedure.
1. Verify that continuous feed paper is installed.
2. Verify that the ribbon is correctly installed.
3. Verify that the width of the installed paper matches the paper width menu setting.
4. Press SELECT and place the printer OFF-LINE (SELECT will NOT be lit).
5. Press QUIET to enter Menu Mode.
6. The line shown below will print.
Font Print Quality LQ
7. Press PRINT to print the current Menu.
When the menu is reset, ALL customized settings ARE LOST.
Printing the Menu provides a reference of customized settings.
8. Power OFF the printer.
9. Press TOF and SELECT while powering ON the printer.
10. The Menu is reset to Factory Defaults.
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Page: 108
Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.4 CLEANING
WARNING
When cleaning the printer, power OFF the printer and detach the AC power cable from the printer
and the AC outlet.
3.4.01 General Information
An accumulation of paper dust is the most frequent cause of print quality problems in a dot matrix printer.
Small pieces of paper can cause paper jams. A dirty platen will smudge paper. It is important to clean the
printer regularly, paying particular attention to the printhead area and the paper paths.
If the lubrication procedures are not performed properly, the printer will require more frequent cleaning.
Excessive lubricant attracts dust and accumulations build up quickly.
Keeping the covers in place and performing the cleaning procedures correctly will help ensure the highest
quality printer output.
3.4.02 Cleaning Schedule
1. Every six months
or
2. Every 300 hours of operating time.
3.4.03 Cleaning Tools
1. Clean, soft, lint-free cloth
2. Long cotton swabs
3. All-purpose cleaner
4. Vacuum cleaner
5. Platen cleaner
3.4.04 Areas to be Cleaned
Areas to be Cleaned
Action to be Taken
Paper Paths
Vacuum and wipe up paper bits and dust.
Printer Mechanism
Vacuum paper dust
Carriage Shaft
Wipe clean with lint-free cloth
Slide Bar
Wipe clean with lint-free cloth
Ribbon Protector
Use a dry cotton swab to remove ink residue
Single Sheet Sensor
Wipe with dry cotton swab
Color Shift Sensor
Wipe with dry cotton swab
Bottom Paper-End Sensor
Wipe with dry cotton swab
Paper Bail Sensor
Wipe with dry cotton swab
Platen
Wipe clean with soft cloth and platen cleaner
Printer Cover
Clean with soft cloth and all-purpose cleaner
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.5 LUBRICATION
3.5.01 General Information
If the lubrication procedures are not performed properly, the printer will require more frequent cleaning.
Excessive lubricant attracts dust and accumulations build up quickly. An accumulation of paper dust is the
most frequent cause of print quality problems in a dot matrix printer.
When lubricating the printer, refer to the lubrication diagrams on the following pages. Each lubrication
point lists a code for the type of lubricant to be used along with a code for the amount of lubricant required.
These codes are defined below.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.5.02 Lubrication Schedule
Once a year
or
Every 600 hours of operating time.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.5.03 Lubrication Types and Amounts
Do NOT over-lubricate the printer. Operational problems are caused by excess lubricant. The excess
lubricant causes dust to accumulate. These accumulations can jam gears or cause print problems.
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating (.008 inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.5.04 Areas Not Lubricated
Lubricant should never contact the parts listed below.
Sensors
Printhead
Mini-pitch Belt
Space Belt
Ribbon
Tractor Pins
Platen Assembly (Rubber Face)
Pressure Roller (Rubber Face)
Head Cable
Space Motor Printed Circuit Board
Electrical Contacts and Connections
Teeth of the gears in the Gear Case Assembly
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Lubrication Points (Monochrome and Color)
Left and Right Sides of Printer
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating (.008
inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Platen, Carriage Shaft, Idle Gear
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating(.008 inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Ribbon Feed Assembly
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating(.008 inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Lubrication Points (Color)
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating(.008
inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Lubrication Points (Options)
Type
Amount
Diagram Designation
Oil
Abundant
PM- A
Machine Oil
Medium: 3 - 4 Drops
PM - B
10w-30 or equivalent
Small: 1 Drop
PM - C
Grease
Abundant
GEP - A
Alvania grease #2 EP
Moly-lube grease
Medium Thin coating(.008
inches)
GEP - B
or equivalent
Small Apply and wipe off
GEP - C
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.6 SHIPPING INSTRUCTIONS
3.6.01 Return for Service
CAUTION:
When shipping the printer, use the original packaging to prevent damage.
Be sure to secure the printhead so it will not move during shipment.
1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B
)
2. Make sure the printhead is secured so it will not move during shipment.
3. Remove the platen knob. Be sure to place it in the shipping container.
4. Pack the unit, using the materials from Step 1.
3.6.02 All Other Returns
CAUTION:
The product MUST be returned in the original packaging.
The product MUST be returned with ALL originally supplied factory items.
Be sure to secure the printhead so it will not move during shipment.
1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B
2. Locate the originally supplied factory items. (Refer to the Set-up Guide.)
3. Make sure the printhead is secured so it will not move during shipment.
4. Pack the unit, using the materials from Step 1.
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)
Page: 119
Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.1 OVERVIEW
4.1.01 Introduction
This section is used to isolate problems to the assembly level. Application problems and detection of faulty
components on the printed circuit boards are NOT addressed.
When troubleshooting a defective unit, follow these steps.
1. Refer to Section 4.3
information.
, which explains where to check for updates to the troubleshooting
2. Section 4.4
contains tips on preventing problems, as well as a list of common problems.
3. Section 4.5
shows samples of abnormal outputs.
4. Section 4.6
provides tables of error messages.
contains the Repair Analysis Procedures (RAPs). Each RAP will ask you questions
5. Section 4.7
or require you to make observations. The answers to these questions and the results of your observations
determine your next course of action. Use the RAP Index to identify which RAP should be used to resolve
the problem with the machine.
6. Section 4.8
provides the procedures for various printer tests.
7. Section 4.9
lists the resistance check points.
lists methods for reporting problems. If you encounter a situation that is NOT
8. Section 4.2
addressed by the documentation in this kit, please report the problem to Okidata, using one of the
methods listed.
Refer to the Service Center Reference Guide for information on contacting Okidata.
4.1.02 Printer Serial Number Identification
To identify the revision level of a printer, record the serial number from the back of the printer. Refer to the
following to decode the serial number.
Example Printer Serial Number: 401A0154693
Date Code 401 (4 = year. 01 = month)
Revision A
Serial Number 0154693
4.1.03 Firmware Revision Level Identification
To identify the revision level and part number of the firmware, print the Rolling ASCII Test or the Font Test.
Refer to Section 4.8
for information on printing the tests.
Header
At the top of each test is a header.
This header provides the information listed below.
ML393+ E I A P F/W 01.07 YR4077-1289
RES 01.00
1. Printer Model ML393+
2. Emulation EI
3. Version A P
4. Firmware Revision Number 01.07
5. Firmware Part Number YR4077-1289
6. Character Generator Revision Number 01.00
7. Character Generator Part Number Not Shown 1 2 3 4 5 6
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.2 REPORTING PROBLEMS
4.2.01 General Information
Okidata strives to provide accurate and detailed service information through its training materials. The
Technical Training Group realizes that service technicians have valuable experience, knowledge, and
opinions. Okidata strongly encourages you to report any problems you may encounter when using the
materials of this training kit. Please be as specific and detailed as possible. Your comments, suggestions,
and criticisms are used to update and revise training kits.
You should reference the training materials when servicing Okidata products. Most problems can be
solved by using the information provided in the training materials. If you encounter a situation that cannot
be solved, please let Okidata know.
Refer to the Service Center Reference Guide for information on contacting Okidata.
4.2.02 Problem Lists
Technicians frequently request a list of common problems specific to a product. Technical Training Kits
are written before a product is shipped to customers. Therefore, such information is NOT available when a
product is first released.
However, Okidata wants to respond to these requests. Okilink II provides round-table discussions on
technical problems. Errors and corrections in the training materials are listed in the Training Section of
Okilink II. The Technical Service Bulletins (also known as Okidata's Monthly Mail) are available via Okilink
II. Situations that are NOT addressed in the reference documentation, technical service bulletins, or
round-tables may be reported to the Dealer Service and Support Engineers (Contact Technical Support)
or the Technical Training Group. You will receive a response to your message within one business day.
The information on Okilink II is the most accurate and up-to-date technical information available from
Okidata. This is only possible with your assistance. By reporting your suggestions, concerns, and
problems, Okidata can provide the best possible information.
Your cooperation is greatly appreciated. Thank you for your help!
4.2.03 Reporting Methods
Okilink II
You may use Okilink II to report your findings. Refer to the Service Center Reference Guide for
information on using Okilink II.
Course Critique
Use the Course Critique to report any problems you find as you are completing the self-paced training.
Fax Number
If you wish to fax your response, please use the numbers listed in the Service Center Reference Guide.
Mailing Address
If you respond by mail, please use the appropriate address listed in the Service Center Reference Guide.
Information Provided
Please provide the following information when reporting problems.
Okidata Dealer Number
Technician's Name
Company Name
Company's Address (Street, City, State/Province, ZIP / Postal Code, Country)
Telephone and Fax Numbers (with area / country access codes)
Product Name
Units Serial Number
Firmware Revision Level
Description of Problem
Document Name (with page number or procedure) with error or problem.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.3 TROUBLESHOOTING UPDATES
4.3.01 General Information
Okidata distributes updated troubleshooting information in three ways.
Okilink II
Faxable Facts
Technical Service Bulletins
4.3.02 Okilink II
Okilink II is Okidata's Bulletin Board Service. This service is available to all Okidata Certified Service
Technicians. Okilink II provides troubleshooting and service information. Technicians can download files,
ask questions of Okidata's technical support personnel, and participate in round table discussions about
Okidata products and services. Technical Service Bulletins, Recommended Spare Parts Lists, Printer
Drivers, Product Specifications, and Service Training Information are also available.
Refer to the Service Center Reference Guide for information on accessing Okilink II.
4.3.03 Faxable Facts
Okidata's Faxable Facts is an automated fax document retrieval system. It is maintained by Okidata's
Customer Information Center. Answers to common questions about Okidata products are available
through Faxable Facts.
Refer to the Service Center Reference Guide for information on accessing Faxable Facts.
4.3.04 Technical Service Bulletins
Okidata's Technical Service Bulletins (TSBs) contain technical information developed after product
release. Firmware updates, part number changes, and procedural changes are some of the subjects
covered by these bulletins. The TSBs are distributed through Okilink II.
Refer to the Service Center Reference Guide for information on accessing Okilink II.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.4 TROUBLESHOOTING TIPS
4.4.01 Preliminary Checks
1. Is the product being operated under the proper ambient conditions?
2. Does the paper being used meet the specifications for this product?
3. Has the ribbon been replaced as recommended?
4. Has the ribbon been installed properly?
5. Is an Okidata ribbon being used?
6. Is the printhead gap correctly set?
7. When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS.
Replacement printed circuit boards are shipped WITHOUT these items.
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD)
safety precautions or you may damage the components.
8. Is the firmware the latest (current) revision?
9. Are the correct printer drivers being used for the printer?
10. Is the printer driver being used the latest (current) release?
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.4.02 Problem Categories
There are three categories of problems that you might encounter when servicing the printer.
ALARM Lamp Blinks (Fatal Errors)
The following can cause the ALARM lamp to blink.
Open Bail Arm
Jammed Paper
Printhead Cannot Move
Other Fatal Error
When the ALARM Lamp is blinking, check the items listed below.
1. Close the bail arm.
2. Check for a paper jam.
3. Verify that the printhead moves freely.
4. Record the status of the PRINT QUALITY and CHARACTER PITCH lamps.
5. Refer to the Alarm Lamp Codes Table. (Section 4.6
)
6. Locate the error.
7. Perform the designated corrective action.
Operational Errors
An Operational Error is usually not accompanied by an ALARM Lamp.
Refer to the Start Here Flowchart (Section 4.4.03
) and perform the corrective action.
ALARM Lamp Lights (Paper End/Jam Conditions)
A solid ALARM Lamp usually indicates a cover open, a paper jam, or paper-end (out of paper) condition.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.4.03 START HERE Flowchart
START
Does the failure occur immediately after the unit is powered ON?
YES Which of the following resembles the problem?
Power is not supplied to the printer
Refer to RAP 01
No spacing operation
Refer to RAP 02
ALARM lamp is blinking
Refer to Section 4.6
NO The problem occurs during printing.
Refer to the RAP Index - Section 4.7
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.4.04 Tips for Preventing Image Problems
1. Make sure that the ribbon is not "dried out". If the printer output is faded, install a new ribbon, then print
another sample.
2. Make sure that the paper you are using is within specifications. Paper specifications can be found in
Section 1 of this Service Handbook .
3. Always place the Head Gap Lever in the position appropriate for the paper that you are using.
Setting
Paper Type
1
12 - 15 lb. paper
2
20 - 24 lb. paper
3-4
Labels
3-4
Two-part forms
4-5
Three-part forms
7
Four-part forms
5-9
Envelopes
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.4.05 Common Problems
1. Nothing happens when the printer is powered ON.
Make sure the printer is plugged in.
Check the power cord connection to the printer and the outlet.
If a power strip is being used, make sure the strip is powered ON.
2. The ALARM lamp is lit.
The printer may be out of paper or the paper may have jammed. The SEL lamp will not light. After loading
paper, press the SEL switch.
The front cover may be open. Close the front cover.
The paper lever may not be set for the type of paper being used. Position the lever correctly.
If the ALARM lamp does not go out after paper is loaded, refer to Section 4.5 of this Service Handbook.
3. The printer does not print when the computer sends it data.
The printer may be deselected. Make sure that the SEL lamp is lit. If it is not, press the SEL switch.
Verify that the interface cable is correctly installed.
4. The paper keeps jamming.
Verify that the top of form is set so that the paper is held in place by the bail bar. If the top edge of the
page is below the bail, it will catch on the bail as it advances. Do not use the FORM FEED switch to load
paper into the printer.
If the paper does jam, power OFF the printer. Carefully back the paper out of the paper path by using the
platen knob. Remove any shreds of paper from the paper path.
5. The printer suddenly changes to unidirectional printing. It then stops printing completely. The MENU
light is flashing.
This indicates a Printhead Overheat Condition. When the printer prints for a long period of time, heat will
build up in the printhead. When the printhead temperature reaches approximately 115 degrees Celsius,
the printer will print unidirectionally. If the temperature continues to rise, printing will stop until the
printhead cools. Printing will resume after the printhead cools.
6. The ALARM lamp is blinking.
The bail is open. Close it.
The paper or ribbon is jammed. Clear the paper path. Thread the ribbon correctly.
The printhead cannot move. Clear the obstruction.
7. Static electricity causes the paper to stick.
In cold, dry weather, static charges can build up on continuous-form paper. This can make the paper cling
to the paper separator. If this problem occurs during high-volume printing jobs, try moving the single sheet
paper guides on the separator together so that the paper rests on the guides rather than on the separator
itself.
8. Files do not print the way the printer menu and front panel are set.
Before sending a file to a printer, many word processors send an initialization string. This string contains
codes that reset the printer to a default set of features. Otherwise, the printer might print using features set
for a previous job. The codes will override panel or menu settings.
Check the word processors manual to see if the initialization string can be modified. If so, remove any
codes that interfere with the printers settings.
To set the printer to ignore the reset code, follow this procedure.
1. Verify that the printer is loaded with paper.
2. Press SELECT until the SELECT lamp goes out.
3. Press QUIET to enter Menu Mode.
4. The first Group/Item/Setting will print.
5. Press GROUP until GENERAL CONTROL prints.
6. Press ITEM until RESET INHIBIT prints.
7. Press SET until VALID prints.
8. Press EXIT save the settings and to exit the Menu Mode.
This will stop the reset code from resetting the printer, but other codes in the initialization string may still
override the printer Menu and / or front panel settings.
9. FONT, PRINT QUALITY, and CHARACTER PITCH (on the operator panel) do not work.
The Operator Panel Function Item in the Printer Menu can be set to enable (FULL OPERATION) or
disable (LIMITED OPERATION) these features. If the printer is part of a customized system or if it is used
by different operators, a system manager may be using this feature to maintain proper print settings.
To activate these switches, power OFF the printer. Press and hold QUIET while powering ON the printer.
Follow the normal menu procedures to set the Operator Panel Functions Item to FULL OPERATION.
10. Output is missing dots.
Check the headgap setting. Move the head gap lever to a lower setting.
Setting
Paper Type
1
12 - 15 lb. paper
2
20 - 24 lb. paper
3-4
Labels
3-4
Two-part forms
4-5
Three-part forms
7
Four-part forms
5-9
Envelopes
Perform the Printhead Gap Adjustment. Refer to Section 3.3 of this Service Handbook for details.
Refer to RAP 03.
11. Strange symbols and incorrect fonts appear during a print run.
The printer driver does not agree with the emulation selected for the printer.
OR
Incorrect printer commands are embedded within the software.
To check the selected emulation, follow this procedure.
1. Verify that the printer is loaded with paper.
2. Press SELECT until the SELECT lamp goes out.
3. Press QUIET to enter Menu Mode.
4. The first Group/Item/Setting prints.
5. Press GROUP until GENERAL CONTROL prints.
6. Press ITEM until EMULATION MODE prints.
7. Press SET until the desired emulation prints.
8. Press EXIT to save the settings and exit the Menu Mode.
If the emulation is correct, check the software documentation on how to select a printer driver. Verify that
the selected driver is correct for the emulation. Refer to the Reference Guide. Drivers near the top of the
list are more compatible with the printer than drivers near the bottom of the list. If the software does NOT
offer any driver on the list, check with the software manufacturer to see if additional drivers have been
added since the software was purchased.
Verify that any embedded commands in the software were correctly entered.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Epson / IBM, Self Test Revision 1.16 (FCO 7681)
NOTE:
This information is also provided in Technical Service Bulletin 3201.
Technical Service Bulletin 3201 covers Field Change Order 7681.
The Microline 393 / 393C Epson IBM printers may experience a premature power supply failure as a result
of the graphics speed running above the specified duty cycle.
The affected printers have a self test revision of 1.16 and are Epson / IBM Models.
The ROM being replaced is Q1 of the Epson / IBM personality module.
Any printer with a self test revision of 1.22 has already been updated.
Field Change Order (FCO) 7681 includes the new ROM and installation instructions.
This FCO may be ordered through Okidata's Order Processing Center.
The part number for the FCO is 58218201.
NOTE:
FCO 7693 replaces FCO 7681.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Missing Spaces When Printing Wide Reports (FCO 7693)
NOTE:
This information is also provided in Technical Service Bulletin 3203.
Technical Service Bulletin 3203 covers Field Change Order 7693.
When printing "wide" reports in letter quality mode, columns may be misaligned. The alignment problem is
caused by missing (dropped) spaces.
Field Change Order (FCO) 7693 corrects this problem. It also corrects premature power supply failures
resulting from a graphics speed running above the specified duty cycle. (FCO 7681)
FCO 7693 includes a program ROM, insulating seals, and installation instructions.
After installing this FCO, the printer will print a self test of 1.21.
This FCO may be ordered through Okidata's Order Processing Center.
The part number for FCO 7693 is 58218401.
NOTE:
FCO 7693 replaces FCO 7681.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Self Test Revisions 1.07 and 1.10 (FCO 7730)
NOTE:
This information is also provided in Technical Service Bulletin 3209.
Technical Service Bulletin 3209 covers Field Change Order 7730.
Microline 393 / 393C-Plus Epson / IBM self test revisions 1.07 and 1.10 print a copy right notice (Copyright
1989 Oki Electric Ind. LTD and Bitstream Inc.) while printing data. Self test revision 2.04 exhibits error
code 47.
Field Change Order (FCO) 7730 includes a ROM, installation instructions, and a product update sheet.
The update sheet lists the functional enhancements incorporated into self test revision 2.04.
The ROM at location Q6 of the main control board is replaced. The self test revision will be 2.05.
This FCO may be ordered through Okidata's Order Processing Center.
The part number for FCO 7730 is 58219601.
NOTE:
The serial numbers for the production cut-in of self test revision 2.05 are listed below.
Configuration
Serial Number
120 V Black
007A0019018
220 V Color
007A0002028
120 V Black
007A0000115
220 V Color
007A0000061
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Parallel Timing Specification Changes
NOTE:
This information is also provided in Technical Service Bulletin 3210.
Firmware Revision 2.04 and above provides better compatibility between the Microline 393-Plus and
Microline 393C-Plus printers and high speed computers and / or non-DOS operating systems.
The firmware changes the parallel interface timing specification. The BUSY and ACKNOWLEDGE signals
are offset and reduced to eliminate potential noise and timing problems with these interface signals.
Firmware Revision 2.04 and above changes the printer menu. The feature, CPU Compensation, is added.
Two settings are available for this feature: Standard and Special.
· Standard
This is the default setting.
It allows the printer to work with high speed computers and / or non-DOS operating systems.
Use this setting from most applications.
· Special
Uses the "old" timing interface specifications.
The symptoms listed below are typical of a problem with the parallel interface timing.
· "Paper End" message on the computer screen
· Hesitation problems
· No printed data
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Jumper SP2 Added to Main Control Board
NOTE:
This information is also provided in Technical Service Bulletin 3211.
The Slave ROM Q17 has been changed to a Masked CPU Q11.
All ICs are located on the main control board.
Jumper Plug SP3 should be open for the Microline 393-Plus.
Jumper Plug SP3 should be shorted for the Microline 393C-Plus.
Jumper SP2 has been added and is set on the A side for the masked ROM change.
NOTE:
The serial numbers for the production cut-in of the change are listed below.
Configuration
Serial Number
Microline 393 E/I (Black) 120 V
0011A0030666 and above
Microline 393 E/I (Black) 220 V Color
0011A0000275 and above
Microline 393 E/I (Color) 120 V Black
0011A0003052 and above
Microline 393 E/I (Color) 220 V Color
N/A
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Font Name Changes in Menu Mode
NOTE:
This information is also provided in Technical Service Bulletin 3212.
The changes listed below have been made to the Menu Mode font names.
TMS Roman became Dutch.
Helvette became Swiss.
The Slave ROM Q17 became a Masked CPU Q11.
All ICs are located on the main control board.
Jumper Plug SP3 should be open for the Microline 393-Plus.
Jumper Plug SP3 should be shorted for the Microline 393C-Plus.
Jumper SP2 has been added and is set on the A side for the masked ROM change.
NOTE:
The serial numbers for the production cut-in of the change are listed below.
Configuration
Serial Number
Microline 393 E/I (Black) 120 V
102A0037642 and above
Microline 393 E/I (Black) 220 V Color
102A0000371 and above
Microline 393 E/I (Color) 120 V Black
102A0003724 and above
Microline 393 E/I (Color) 220 V Color
N/A
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Modifications to Q6, Main Control Board
NOTE:
This information is also provided in Technical Service Bulletin 3213.
The main control board has been modified. EPROM socket location Q6 accepts four additional pins.
Either a 28 pin EPROM or a 32 pin Masked ROM may be installed with no changes and full compatibility.
No jumper changes are necessary.
When installing a 28 pin EPROM, the four unused pins (two on each side) are on the left side of the
socket. Refer to the diagram.
The 32 pin Masked ROM uses all 32 pins on the socket.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.5 ABNORMAL OUTPUT
4.5.01 Output Samples
Light Print on the Entire Page
Possible Causes
· Ribbon is "dried out". Replace the ribbon.
· Head gap lever is in the incorrect position. Place the lever in correct position.
· Paper is not within specification. Refer to Section One for paper specification.
Uneven Print Density
Possible Causes
· Printhead gap not within specification. Perform the printhead gap adjustment.
· Defective platen. Replace the platen.
Smeared Print
Possible Causes
· Head gap lever is in the incorrect position. Place the lever in correct position.
· Paper is not within specification. Refer to Section One for paper specification.
· Ribbon protector is missing or broken. Replace the ribbon protector.
Inconsistent Line Feed
Possible Causes
· Power OFF the printer. Turn the platen knob. The platen should rotate smoothly. If it does not, remove
the cause of the binding.
· Make sure that the line feed belt tension is within specification. If it is not, tighten the line feed belt.
· Defective line feed motor. Replace the line feed motor.
Drifting Margin
Possible Causes
· Power OFF the printer. Move the carriage assembly. The carriage should move smoothly. If it does not,
remove the cause of the binding.
· Make sure that the space belt tension is within specification. If it is not, tighten the belt.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.6 FAULT ALARMS
4.6.01 General Information
When an error condition exists, the ALARM LAMP will flash. The operator panel is used to display printer
error conditions. The type of error condition can be determined by decoding the operator panel lamps.
Refer to the Alarm Codes Table in this section to identify both the error condition and the recommended
corrective action for each condition.
NOTE:
The Alarm Codes Table only applies in situations when the ALARM LAMP is flashing.
Alarm Codes Table
Character
Pitch
Print
Qualit
y
LQ
NLQ
UT
L
15
17
20
ON
Alarm
Code
Correctiv
e Action
MPU
Internal
RAM Error
11
Replace
control
board
Program
ROM Error
12
Replace
Master
ROM
ON
Resident
CG Error
13
Replace
control
board
ON
Slave
ROM/RAM
Error
21
Replace
Slave
ROM
Slave/Mas
ter
Matching
Error
22
Replace
Master/Sl
ave ROM
PRO
P
ON
ON
O
N
ON
O
N
ON
ON
Alarm
Descriptio
n
O
N
ON
ON
ON
ON
O
N
ON
ON
External
RAM Error
31
Replace
RAM
cartridge
ON
Command
FIFO
Check
Error
41
Replace
control
board
ON
Print Pass
Error
43
Replace
control
board
Position
Sense
Error
44
Replace
control
board
Print Over
Run Error
51
Replace
control
board
Print Stop
Error
52
Replace
control
board
Head
Homing
Error
53
Refer to
RAP 03
EEPROM
Write Error
56
Replace
control
board
ON
ON
ON
ON
ON
O
N
ON
ON
O
N
ON
ON
ON
O
N
ON
ON
ON
O
N
ON
Spacing
Error
57
Refer to
RAP 02
ON
ON
ON
O
N
ON
Ribbon
Error
5B
Refer to
RAP 04
ON
ON
ON
Bail Arm
Error
5C
Refer to
RAP 05
Fan Alarm
60
Replace
Power
Supply
Unit
ON
ON
ON
ON
ON
OPER
ATIO
NAL
ERRO
RS
Power
Lamp Not
Lit
N/A
Refer to
RAP 01
Missing
Dots
N/A
Refer to
RAP 06
Ribbon
Feed
Problem
N/A
Refer to
RAP 07
Line Feed
Problem
N/A
Refer to
RAP 08
Operator
Panel
Problem
N/A
Refer to
RAP 09
Data
Receiving
Problem
N/A
Refer to
RAP 10
Ribbon
Shift
Problem
N/A
Refer to
RAP 11
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.7 REPAIR ANALYSIS PROCEDURES (RAPs)
4.7.01 Using the RAPs
When using the Repair Analysis Procedures, follow these steps.
1. Go to the RAP Index.
2. Find the RAP which is associated with the printers problem.
3. Go to the appropriate RAP.
4. All RAPs begin with a START statement, followed by questions or another type of statement.
4.7.02 RAP Index
Description
RAP Number
Power Lamp Does Not Light
01
Space Error (ALARM 57)
02
Head Homing Error (ALARM 53)
03
Ribbon Homing Error (ALARM 5B)
04
Bail Home Error (ALARM 5C)
05
Wrong Character Character Omission or Dot
Omission
06
Ribbon Feed Trouble
07
Line Feed Trouble
08
Malfunction of Operator Panel Switch
09
Data Receiving Failure
10A
Parallel Interface Problem
10B
Serial Interface Problem
10C
Data Receive Problem Alarm Light Lit
10D
Color Ribbon Shift Problems
11
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 01: Power Lamp Does Not Light
NOTE:
If the printer operates normally, but the POWER LAMP does not light, replace the Operator Panel.
Refer to Appendix A for voltage test points and connector locations.
START
Is the AC cable connected to an AC outlet and the printer?
NO Connect the AC cable.
Has the problem been resolved?
YES End of procedure
NO Go to the next step listed below.
YES Is the F1 fuse on the power supply unit open?
YES Replace the fuse F1. If it opens again, replace the power supply unit.
Has the problem been resolved?
YES End of procedure
NO Go to the next step listed below.
NO Are the +5 vdc and +38 vdc present on the control board? Check for +38 vdc at both ends of capacitor
C2. Check for +5 vdc between pin 16 of Q2 and the power bar.
NO Are cables CN3 and CN7 on the control board correctly connected?
NO Connect cables CN3 and CN7 at the control board.
YES Replace the power supply unit. OR Replace the connection cable.
YES Replace the control board.
Has the problem been resolved?
NO Contact Okidata Technical Support.
YES End of procedure.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 02: Space Error (ALARM 57)
START
Is the carriage assembly binding or jammed?
YES Check around the space motor mechanism for any obstructions. Then, remove the cause of the
carriage jam.
NO Go to Step A.
Has the problem been resolved?
YES End of procedure.
NO Is fuse F1 on the control board blown?
YES Replace fuse F1.
NO Go to A.
Has the problem been resolved?
YES End of procedure.
NO Go to A.
A
Is +38 vdc present on the control board? Check on both ends of the capacitor C2.
NO Are cables CN1 and CN5 on the control board correctly connected?
YES Replace the control board.
NO Connect them correctly.
Has the problem been resolved?
YES End of procedure.
NO Replace the space motor.
YES Are cables CN3 and CN7 on the control board correctly connected?
YES Replace the power supply unit or connection cable.
NO Connect them correctly.
Has the problem been resolved?
YES End of procedure.
NO Replace the space motor.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 03: Head Homing Error (ALARM 53)
START
Is +38 vdc present on the control board? Check for an open fuse on control board.
YES Is connector CN1 on the control board correctly installed?
YES Replace the control board.
NO Correctly install the connector.
Has the problem been resolved?
YES End of procedure.
NO Contact Okidata Technical Support.
NO Are cables CN3 and CN7 on the control board correctly connected to the power supply unit?
YES Replace the power supply unit.
NO Correctly connect the cables.
Has the problem been resolved?
YES End of procedure.
NO Replace the space motor.
Has the problem been resolved?
YES End of procedure.
NO Contact Okidata Technical Support.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 04: Ribbon Homing Error (ALARM 5B)
START
Is the printer the color model?
NO Is shorting plug SP3 of the control board open?
NO Set it open.
YES Go to A.
YES Manually rotate the ribbon shift cam counterclockwise. Does it rotate smoothly?
NO Check the areas listed below.
No paper scrap or foreign matter on the gear
Smooth gear meshing
No friction at each fulcrum of the carriage bracket, roller lever and ribbon shift arm
YES Is cable CN2 on the sensor board connected correctly?
NO Connect it correctly.
YES Is cable CN4 on the control board connected correctly?
NO Connect it correctly.
YES Is there dirt or dust on the ribbon home sensor on the sensor board?
YES Clean the sensor.
NO Go to A.
A
Replace the sensor board.
Has the problem been resolved?
YES End of procedure.
NO Replace the bail/ribbon motor.
Has the problem been resolved?
YES End of procedure.
NO Replace the control board.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 05: Bail Home Error (ALARM 5C)
START
Manually rotate the bail open gear counterclockwise.
Does it rotate smoothly?
NO Perform the following.
Remove any paper scrap or foreign material near the bail/ribbon motor gear, idle gear and bail open gear.
Check the meshing of each of the above gears.
YES Is cable CN4 on the control board connected correctly?
NO Connect it correctly.
YES Are cables CN2/CN3 on the sensor board connected correctly?
NO Connect them correctly.
YES Is there dirt or dust on any of the sensors on the sensor board?
YES Clean the sensors.
NO Is the bail arm lever damaged?
YES Replace the bail arm lever.
NO Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Replace the sensor board.
Has the problem been resolved?
YES End of procedure.
NO Replace the bail/ribbon motor.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 06: Wrong Character, Character Omission, or Dot Omission
START
Are cables CN2 and CN6 on the control board connected correctly?
NO Connect them correctly.
YES Is cable CN101 on the interface connector board connected correctly?
NO Connect it correctly.
YES Is the interface cable connected correctly?
NO Connect it correctly
YES Are the +/- 8 vdc output voltages supplied by the control board? Check at both ends of C9 for the
positive voltage. Check at both ends of C8 for the negative voltage.
YES Replace the printhead.
Has the problem been resolved?
YES End of procedure.
NO Go to A
NO Are cables CN3 and CN7 on the control board properly connected to the power supply unit?
NO Connect them correctly.
YES Replace the power supply unit.
A
Replace the Program and Slave ROMs on the control board. Has the problem been resolved?
YES End of procedure.
NO Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Are the cables connected to CN2 and CN6 on the control board damaged?
YES Replace the cables.
NO Check the MENU Settings related to the interface. Baud Rate Character Format Protocol BUSY Signal
output selection
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 07: Ribbon Feed Trouble
START
Remove the ribbon cartridge and rotate the ribbon cartridge ribbon feed knob.
Does it rotate smoothly?
YES Check to see if the ribbon lock mechanism has been disengaged.
NO Replace the ribbon cartridge.
Manually shift the carriage to the left and to the right.
Does the ribbon feed shaft rotate?
NO Replace the ribbon feed assembly.
After the replacement, adjust the backlash between the space motor gear and bevel gear.
YES Check that the ribbon feed shaft is correctly engaged with the ribbon feed roller of the ribbon
cartridge.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 08: Line Feed Trouble
START
Manually rotate the platen knob.
Does it rotate smoothly?
NO Set the release lever to the open side.
Does the platen knob rotate smoothly?
NO Adjust the mini-pitch belt tension.
YES Perform the following.
1. Check for correct phasing of push tractor (left or right).
2. Replace the push tractor (left or right).
3. Check for smooth meshing of platen gear, idle gear, and drive gear.
4. Remove any foreign matter or dust on the platen gear, idle gear, or drive gear.
YES Is cable CN6 on the control board connected correctly?
NO Connect it correctly.
YES Is cable CN101 on the interface connector board connected correctly?
NO Connect it correctly.
YES Is cable CN102 on the interface connector board connected correctly?
NO Connect it correctly.
YES Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Replace the line feed motor.
After replacing the line feed motor, adjust the belt tension.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 09: Malfunction of Operator Panel Switch
START
Is cable CN1 on the operator panel connected correctly?
NO Connect it correctly.
YES Is cable CN10 on the operator panel connected correctly?
NO Connect it correctly.
YES Replace the operator panel.
Has the problem been resolved?
YES End of procedure.
NO Replace the control board.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 10A: Data Receive Failure
START
Is the SELECT lamp blinking?
YES Modify the menu to Ignore DC3.
NO Is the ALARM lamp ON?
YES Refer to RAP 10D.
NO Is the SELECT lamp ON?
NO Place the printer ON-LINE.
YES Is the interface cable connected correctly?
NO Connect it correctly.
YES Is cable CN101 on the interface connector board connected correctly?
NO Connect it correctly.
YES Is cable CN6 on the operator panel connected correctly?
NO Connect it correctly.
YES Are you using a parallel interface?
YES Refer to RAP 10B.
NO Refer to RAP 10C.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 10B: Parallel Interface Problem
START
Replace the Master and Slave Program ROMs.
Has the problem been resolved?
YES End of procedure.
NO Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Perform the following:
1. Replace the interface connector board.
2. Replace the cable connected to CN6 on the control board.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 10C: Serial Interface Problem
START
Correctly set the interface menu parameters.
1. Baud rate.
2. Character format.
3. Protocol.
4. Busy signal polarity.
Has the problem been resolved?
YES End of procedure.
NO Are +/-8 vdc outputs provided on the control board?
Check at both ends of C9 for the positive voltage.
Check at both ends of C8 for the negative voltage.
NO Replace the power supply unit.
YES Refer to RAP 10B.
Has the problem been resolved?
YES End of procedure.
NO Replace the power supply board.
Has the problem been resolved?
YES End of procedure.
NO Perform the procedures listed below.
1. Replace the interface connector board.
2. Replace the cable connected to CN6 on the control board.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 10D: Data Receive Failure (Alarm Light Lit)
START
Remove the upper cover.
Press and hold the cover open microswitch while powering ON the printer.
Does the alarm lamp come on?
NO Perform the operations listed below.
1. Correctly connect cable CN13 on the control board.
2. Check the alignment between the front access cover and the COVER OPEN switch.
3. Replace the COVER OPEN microswitch/cable assembly.
YES Is the paper properly installed?
NO Install the paper properly.
YES Does the continuous form end microswitch function correctly?
NO Perform the operations listed below.
1. Correctly connect CN103 on the interface connector board.
2. Replace the sheet feeder assembly L.
YES Does the single sheet end sensor function correctly?
NO Perform the operations listed below.
1. Clean the sensor surface.
2. Correctly connect CN1 on the sensor board.
3. Replace the sensor cable assembly.
YES Does the bottom feed paper end sensor function correctly?
NO Perform the operations listed below.
1. Clean the sensor on the sensor board.
2. Correctly connect cable CN4 on the control board.
3. Replace the sensor board.
YES Go to A.
A
Does the release lever microswitch function correctly?
NO Perform the operations listed below.
1. Correctly connect cable CN9 on the main control board.
2. Replace the release lever, microswitch, and cable assembly.
YES Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Contact Okidata Technical Support.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 11: Color Ribbon Shift Problem
START
Does the ribbon shift mechanism operate properly?
NO Go to A.
YES Is BLACK RIBBON set on the menu?
NO Go to B.
YES Set another color.
Has the problem been resolved?
NO Go to B.
YES End of procedure.
A
Is the ribbon installed properly?
NO Correct the ribbon installation.
YES Go to C.
B
Are CN4 on the control board and CN2 on the sensor board connected correctly?
NO Connect the cables correctly.
YES Replace the control board.
Has the problem been resolved?
YES End of procedure.
NO Replace the ribbon/bail motor assembly.
Has the problem been resolved?
YES End of procedure.
NO Go to A.
C
Check the parts listed below.
1. Shoulder screw
2. Ribbon shift arm and spring
3. Roller lever
4. Ribbon cartridge balance spring
Are they normal?
NO Correct the installation or replace the defective assembly.
YES Check the parts listed below.
1. Ribbon shift cam and gear
2. Ribbon shift cam/lever assembly
Has the problem been resolved?
YES End of procedure.
NO Go to D.
D
Check the parts listed below.
1. Ribbon shift cam and gear
2. Ribbon shift cam/lever assembly
Are they normal?
YES Replace the sensor board.
NO Correct the installation or replace the defective assembly.
Has the problem been resolved?
YES End of procedure.
NO Replace the control board.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.8 PRINTER TESTS
4.8.01 General Information
This section covers the tests listed below.
· Rolling ASCII Test
· Font Test
· Serial Interface Loopback Test
· Hexadecimal Dump Mode
The Rolling ASCII and Font Tests check print operations.
The Serial Interface Loopback Test checks the operation of the serial interface board.
The Hexadecimal Dump Mode checks the data transfer between the computer and printer.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.8.02 Rolling ASCII Print Test
General Information
The Rolling ASCII Print Test is a continuous printout of all 96 ASCII characters. The type style set in the
printer menu will be utilized.
Use this test to check the items listed below.
Print Quality
Across the entire length of a line
Down the entire page
Line Spacing
Character Formation
Left Margin Alignment
Header Information
At the top of the printout, you will see the Printer Model, Emulation, Country Code, Interface Selection and
Firmware Revision Level. This information is often required when performing service or when contacting
Okidata. Have this test available during your service call.
Procedure
CAUTION:
If 13.6 inch Paper Width is selected in the Menu, and you run this test with 8.5 inch wide paper loaded, the
printer will print on the platen. This may damage the platen, ribbon and printhead.
1. Check the Paper Width setting in the Menu. Load the appropriate width paper or modify the menu
setting.
2. Verify that the printer is loaded with paper.
3. Verify that the ribbon is installed.
4. Power OFF the printer.
5. Press and hold the PARK/TOF switch while powering ON the printer. If the printer is powered on and
the Rolling ASCII Test does not start, you may have released the PARK/TOF switch too soon.
6. To stop the Rolling ASCII Test, press the SELECT switch or power OFF the printer.
Rolling ASCII Print Test Sample
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.8.03 Font Test
General Information
This test will print samples of the available fonts.
The standard fonts are listed below. The cartridge fonts will depend on the cartridge installed.
LQ - ROMAN 10 cpi, Proportional, Super / Subscript
LQ - SWISS 10 cpi, Proportional, Super / Subscript
LQ - COURIER 10 cpi,12 cpi, 15 cpi, 17.1 cpi, 20 cpi, Proportional, Super / Subscript
LQ - ORATOR 10 cpi, 12 cpi, Super / Subscript
LQ - 12 cpi
UTILITY - 10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20 cpi,
HSD - 15 cpi
LQ - SWISS Double Width / Height
LQ - SWISS 18 point with Outline
LQ - SWISS 18 point with Shadow
LQ - SWISS Triple Width / Height
Header Information
At the top of the printout, you will see the Printer Model, Emulation, Country Code, Interface Selection and
Firmware Revision Level. This information is often required when performing service or when contacting
Okidata. Have this test available during your service call.
Procedure
1. Verify that the printer is loaded with paper.
2. Power OFF the printer.
3. Press and hold the LINE FEED switch while powering ON the printer. If the font test does not print after
you power ON the printer, you may have released the LINE FEED switch too soon.
4. To stop the test, press the SELECT switch or power OFF the printer.
Font Test Sample
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.8.04 Serial Interface - Loopback Test
NOTE:
In order to run this test, a serial loopback test connector must be attached to the printers serial port.
Procedure
1. Place the printer in the Serial Diagnostic Mode
Set the DIAGNOSTIC TEST menu item to YES.
2. Power OFF the printer.
3. Attach the loopback test connector to the printers serial port.
4. Install continuous feed paper.
5. Power ON the printer.
6. The message LOOP TEST prints.
7. The size of the Message Buffer prints.
8. One of the messages listed below prints.
If the message OK prints, the serial interface function has been tested and no problems were found.
If the message IF BAD prints, the signal logic was tested and a problem was found.
9. Hexadecimal characters 20 through 7F are transmitted through the transmit data line.
10. The receive data line receives the characters.
11. The message buffer stores the characters.
12. The data prints.
13. The test runs until the SELECT switch is pressed or the printer is powered OFF.
14. To exit test mode, power OFF the printer.
15. Press FORM FEED while powering ON the printer to enter Menu Mode.
16. Set the Diagnostic Test menu item to NO.
17. Power OFF the printer.
18. Remove the loopback test connector.
Serial Loopback Plug Diagram
Loopback Connector Configuration
1. Jumper the following pins together.
Pin 2 to Pin 3
Pin 4 to Pin 5
Pin 8 to Pin 11
Pin 6 to Pin 20
Serial Cable Information
The information in this section will help you make a serial cable to connect between the printer and
computer.
Refer to the computer documentation to determine the cable requirements on the computers end.
The printer has the following cable requirements.
· Shielded, RS-232C cable
· UL and CSA approved
· No more than 50 feet long
· Cannon DB-25P plug (or equivalent) with 25 pins
· Cannon DB-C2-J9 (or equivalent) connector shell
Serial Interface Signal Requirements
Pin
Signal
Symbol
Direction
Description
1
Protective Ground
PG
Ground
Connected to the printer
frame
2
Transmit Data
TD
From Printer
Serial data transmitted to the
system
3
Receive Data
RD
To Printer
Serial data received by the
printer
4
Request to Send
RTS
From Printer
Always set to low (mark)
5
Not Used
6
Data Set Ready
DSR
To Printer
Indicates that data can be
sent
7
Signal Ground
SG
Ground
Ground
8 to
10
Not Used
11
Supervisory Send
Data
SSD
From Printer
Indicates that the printer is
not ready to receive data
12 to
19
Not Used
20
Data Terminal
Ready
DTR
From Printer
Indicates that the printer is
not ready to receive data
21 to
25
Not Used
Commonly Used Serial Cable Configurations
IBM 25-Pin Cable Configuration
IBM 9-Pin Cable Configuration
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.8.05 Hexadecimal Dump
General Information
Hexadecimal Dump Mode allows you to test the data being sent from the computer to the printer.
When the printer is in Hex Dump Mode, all data received (including text and printer commands) will be
printed in both hexadecimal and ASCII format.
NOTE:
In ASCII format, all non-printable characters are represented by a period.
Example
Below is a line of BASIC code.
LPRINT CHR$(27) ;"0";CHR$(30);"This is an example of hexadecimal dump."
Below is the same line as it would appear in Hex Dump Mode.
This is an example of a hexadecimal dump
1B 30 1E 54 68 69 73 20 69 73 20 61 6E 20 65 78 0.
61 6D 70 6C 65 20 66 20 61 20 68 65 78 61 64
65 63 69 6D 61 6C 20 64 75 6D 70 2E 0D 0A
Procedure
1. Verify that paper is loaded.
2. Verify that the ribbon is installed.
3. Power OFF the printer.
4. Press and hold SELECT and FORM FEED while powering ON the printer.
5. The printer will print the line shown below.
HEX DATA DUMP
6. The printer is ready to receive data in the Hexadecimal Dump Mode.
7. Send data to the printer.
8. To exit Hex Dump Mode, power OFF the printer.
Sample
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.9 RESISTANCE CHECKS
4.9.01 General Information
The following resistance charts are included in this section.
Printhead Resistance
Line Feed Motor Resistance
Space Motor Resistance
Ribbon Motor Resistance
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.9.02 Printhead Resistance Check
The resistance of each coil should be about 4.5 ohms.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.9.03 Line Feed Motor Resistance Check
The resistance of each coil should be about 5.6 ohms.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.9.04 Space Motor Resistance Check
The resistance of the motor should be about 11.4 ohms.
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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
4.9.05 Ribbon Motor Resistance Check
The resistance of each coil should be about 34 ohms
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.1 OVERVIEW
A.1.01 General Information
This section describes the characteristics of the printed circuit boards used in the unit.
The following areas are covered.
Firmware
Fuses
Jumpers
Sensors
Switches
Test Points
Where an item is not applicable, the word NONE will be listed.
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2 INDEX TO CHARTS
Description
Board Designation
Section
Main Control Board
LQEM
A.2.01
Power Supply
N/A
A.2.02
Interface Connection Assembly
LQPN
A.2.03
Sensor Board
LQEW or LPRW
A.2.04
Operator Panel Board
LQSX
A.2.05
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2.01 Main Control Board (LQEM)
Firmware
Q6 - Program ROM of Master MPU
Q7 - Character Generator ROM
Q17 - Program Rom of Slave MPU
Fuses
F1 2.0 Amp 125V
Jumpers
SP1: OPEN - Internal ROM
SHORTED - External ROM
SP3 OPEN - Monochrome Model
SHORTED - Color Model
Sensors
NONE
Switches
NONE
Test Points
+ 38vdc
Printhead, SP Motor, LF Motor and Bail/Ribbon motor drive voltage.
Check on both ends of Capacitor C2.
+ 5vdc
Logic IC/LED drive voltage.
Check between pin 16 of Q2 and the power bar.
+ 8vdc
Line feed motor holding voltage and serial interface line voltage.
Check on both ends of C9.
- 8vdc
Serial interface line voltage.
Check on both ends of C8.
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2.02 Power Supply
Firmware
NONE
Fuses
F1 10.0 Amp 125V
Jumpers
NONE
Sensors
NONE
Switches
NONE
Test Points
CN - 1 Pin 6 +38vdc
CN - 2
Pin 6 +8vdc
Pin 7 -8vdc
Pin 4 +5vdc
Pin 2 Signal Ground
Pin 3 Signal Ground
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2.03 Interface Board (LQPN)
Fuses
NONE
Jumpers
SP101
A Side: Auto Feed XT signal of Centronics interface valid
B Side: Auto Feed XT signal of Centronics interface invalid
SP102
A Side: I-Prime Signal of Centronics interface is valid
B Side: I-Prime Signal of Centronics interface is invalid
SP103
A Side: +5 vdc is output to pin 18 of Centronics interface.
B Side: +5 vdc is not output to pin 18 of Centronics interface.
Sensors
NONE
Switches
SW101 - This switch toggles for selecting either the serial or parallel interface.
Firmware
NONE
Test Points
NONE
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2.04 Sensor Board (LQEW or LPRW)
Firmware
NONE
Fuses
NONE
Jumpers
NONE
Sensors
Bottom Paper Sensor
Bail Arm Sensor
Ribbon Shift Sensor
Located on sensor board in color model only
CN1
Connector for Friction Feed Paper Photosensor (located on the Paper Pressure Guide)
Switches
NONE
Test Points
NONE
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Service Guide ML393/ML393CPlus
Chapter A Board Diagrams
A.2.05 Operator Panel Board (LQSX)
Firmware
NONE
Fuses
NONE
Jumpers
NONE
Sensors
NONE
Switches
NONE
Test Points
NONE
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Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.1 OVERVIEW
B.1.01 General Information
This appendix will assist you in identifying the assemblies and parts of the product.
Use Section Four (Failure Analysis) to determine the defective part(s).
Locate the part and its part number in this section.
Appendix B is cross-referenced to Section Three (Maintenance).
Format
The format for this appendix is a series of tables with diagrams. The tables contain the item reference
number, the Okidata and Oki-Japan (Oki-J) part numbers, the part description, a comments section, and
the disassembly procedure.
Items with the comments RSPL (Recommended Spare Parts List), Consumable, Document, or Option
are available from Okidata. Items without these comments are usually not stocked.
Some items are only available as assemblies. Every effort has been made to clearly indicate which items
are in assemblies and which are not.
N/A will appear where a part number is not available.
Current Part Numbers
Okidata has made every effort to include current part numbers in this Service Handbook at the time of
publishing.
However, technical information frequently changes. These changes often include new or modified parts,
with new or modified part numbers.
Please refer to the following resources for current part numbers and pricing.
· Okidata's Electronic Bulletin Board (Okilink II) contains current part numbers, prices, and
recommended stocking levels for each item listed as a recommended spare part. For instructions on
accessing Okilink II, refer to the Service Center Reference Guide.
· Okidata's Faxable Facts is an automated fax document retrieval system. Part numbers and pricing are
available through Faxable Facts. For instructions on accessing Faxable Facts, refer to the Service
Center Reference Guide.
· Okidata's Technical Information Group is a telephone support line reserved for Authorized Dealers.
Part numbers and pricing are available through Technical Information. For instructions on accessing
Technical Information, refer to the Service Center Reference Guide.
REMEMBER
Current part numbers, recommended stocking levels, and pricing information are available through
Okilink II, Faxable Facts, and Technical Information. Refer to the Service Center Reference Guide for
information on accessing these resources.
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Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.1.02 Definition of Terms
Assemblies
Assemblies are parts grouped under a single description and/or part number. Generally, individual items in
an assembly are not available from Okidata.
Assemblies are surrounded by broken line boxes in the diagrams.
Assemblies will say "Includes xx xx" under the Comments section of the tables.
Parts in assemblies will say "Part of xx" under the Comments section of the tables.
Blank
Okidata does not recommend stocking this item. This item should be purchased on an As Required Basis
only.
The availability of this item is NOT guaranteed by Okidata.
Consumable
A consumable is a supply item which has a specified life and must be periodically replaced. It is
purchased and installed by the end user. Okidata machines are designed to work exclusively with Okidata
consumables. By using genuine Okidata consumable products, the investment made in the equipment is
protected.
Document
A document is a printed item which supports the service and marketing of a product. Various documents
are available from Okidata.
Drivers
Printer drivers are updated frequently. Please refer to Okilink II for the latest printer driver information.
Firmware
Firmware is revised frequently. Please refer to Okilink II for the latest firmware information.
Option
An option is a part/assembly which is added to a product. The option expands the products functionality.
An option may or may not be installed by the end user. Instructions for installation accompany each
option.
Option RSPL
Okidata recommends that this part/assembly be on hand for servicing installed options.
RSPL
Okidata recommends that this part/assembly be on hand for servicing.
Technical Service Bulletins
Technical Service Bulletins (TSBs) are also referred to as Okidata's monthly mail.
The TSBs contain the latest information on firmware revisions, procedure changes, and technical
information updates.
Okidata distributes the TSBs through Okilink II. The TSBs are issued monthly.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 170
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.1.03 Parts Ordering Information
Service Center Reference Guide
When a technician has successfully completed a Service Training Course for a product and the Dealer
has become Service Authorized, an information package is provided to the Dealer. The Okidata Service
Center Reference Guide outlines the following items.
· Responsibilities of Okidata Service Centers
· Spare parts and consumables information
· Procedures for warranty repairs
· Product Training, Certification, and Authorization
· Product Support information
· Okidata Depot information and services
· Third Party Service information
· Information about Okidata's Customer Information Center
· Okidata Service and Support telephone numbers.
The Service Center Reference Guide contains the procedures to follow for ordering parts. Please read,
understand, and follow these procedures. Service Authorization for a specific product must be obtained
before a Dealer can submit warranty claims.
Direct questions regarding the Service Center Reference Guide to Okidata Dealer Service. Refer to the
Service Center Reference Guide for information on contacting Okidata.
Placing a Parts Order
All authorized Okidata resellers may order spare parts and consumables for Okidata products. Orders are
placed through Okidata's Order Processing Center Department.
Please refer to your Service Center Reference Guide for details on ordering parts.
You should have the following information available before you place your order.
· Okidata Dealer Authorization Number
· Okidata Customer Number
· Your Purchase Order Number
· Okidata Part Number(s)
Use this Appendix, Okilink II, Faxable Facts, or contact Okidata Technical Support to find the correct part
number. Refer to the Service Center Reference Guide for information on contacting Okidata.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 171
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2 CHARTS
Below is an index to the illustrated parts breakdown charts.
Description
Section
Printer Unit
B.2.01
Upper Cover Assembly
B.2.02
Printer Unit General Assembly (1 of 2)
B.2.03
Printer Unit General Assembly (2 of 2)
B.2.04
Operator Panel Assembly
B.2.05
Printer Mechanism - Monochrome (1 of 3)
B.2.06
Printer Mechanism - Monochrome (2 of 3)
B.2.07
Printer Mechanism - Monochrome (3 of 3)
B.2.08
Printer Mechanism - Color (1 of 3)
B.2.09
Printer Mechanism - Color (2 of 3)
B.2.10
Printer Mechanism - Color (3 of 3)
B.2.11
Carriage Assembly - Monochrome
B.2.12
Carriage Assembly - Color
B.2.13
Options
B.2.14
Pull Tractor Unit Assembly (Option)
B.2.15
Packing Materials
B.2.16
Consumables
B.2.17
Documentation
B.2.18
Service Training Kit Revisions
B.2.19
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Page: 172
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.01 Printer Unit
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
128
62405001
N/A
Printer: Microline
393 Epson Black
120 V
N/A
128
62405002
N/A
Printer: Microline
393 Epson Black
220/240 V
N/A
128
62405003
N/A
Printer: Microline
393 Epson/IBM
Black 120 V
N/A
128
62405101
N/A
Printer: Microline
393C Epson Color
120 V
N/A
128
62405102
N/A
Printer: Microline
393C Epson/IBM
Color 220/240 V
N/A
128
62405103
N/A
Printer: Microline
393C Epson/IBM
Color 120 V
N/A
128
62408201
N/A
Printer: Microline
393-Plus Black 120
V
N/A
128
62408202
N/A
Printer: Microline
393-Plus Black 220
V
N/A
128
62408301
N/A
Printer: Microline
393C-Plus Color 120
V
N/A
128
62408302
N/A
Printer: Microline
393C-Plus Color 220
V
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 173
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.02 Upper Cover Assembly
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer
to B.1.02
Disassembly
Procedure
1
50212427
2PA4016-4723G27
Cover: Middle
(ML393+)
RSPL
3.2.04
2
50212306
2PA4016-6062G6
Cover: Access
(Monochrome)
RSPL
3.2.04
3
50212504
2PA4016-4725G4
Cover: Rear
RSPL
3.2.04
85
50212307
2PA4016-6062G7
Cover: Access
(Color)
RSPL
3.2.04
86
50212426
2PA4016-4723G26
Cover: Middle
(ML393C+)
RSPL
3.2.04
125
53482901
N/A
Lever: Bail
3.2.04
126
51001901
N/A
Separator: Paper
3.2.04
127
53482801
N/A
Guide: Sheet
Insertion
3.2.04
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Page: 174
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.03 Printer Unit General Assembly (1 of 2)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
4
50054202
4YA4023-1100G1
Printhead: (Mylar
Comp)
RSPL
3.2.01
5
53478601
3PP4043-2501P1
Knob: Platen
RSPL
3.2.04
12 *
55050411
4YA4042-1460G11
PCB: Main
(LQEM-1) Black
RSPL
3.2.06
13
55034501
4YA4042-1293G11
PCB:
LQPN-Interface
Connection
[Assembly]
RSPL
3.2.07
14
56406202
4YB4049-1277P2
Power Supply
Assembly (220 vac)
RSPL
3.2.22
15
56411201
4YB4049-1709P1
Power Supply
Assembly (120 vac)
RSPL
3.2.22
16
56619201
3YS4011-7912G1
Cord: I/F Main PCB
Connection (50 Pin)
RSPL
3.2.06
17
56614101
4YS4011-6295G1
Cord: Power
Connection (9 Pin)
RSPL
3.2.22
18
56614801
4YS4011-6253G3
Cord: Power
Connection (13 Pin)
RSPL
3.2.22
19
56609701
3YS4011-1315P1
Cord: AC Power
(120 vac)
RSPL
3.2.01
20
56624101
3YS4011-1265P1
Cable: AC 220V
(ML) Right Ang
RSPL
3.2.01
60
70011701
2PA4016-4722G4
Pull Tractor
Assembly w/
Acoustic Cover
Option
N/A
61
70010201
4YA4042-1301G101
Gothic Font
Cartridge
Option
3.2.04
62
70010101
4YA4042-1301G102
Prestige Font
Cartridge
Option
3.2.04
63
70016401
4YA4042-1470G101
Cartridge: 32 Kbyte
RAM Expansion
Option
3.2.04
, 3.22
* When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS.
Replacement printed circuit boards are shipped WITHOUT these items.
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD)
safety precautions or you may damage the components.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Page: 175
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.04 Printer Unit General Assembly (2 of 2)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer
to B.1.02
Disassembly
Procedure
84 * *
55050412
4YA4042-1460G12
PCB: Main
(LQEM-2) Color
RSPL
3.2.06
103
55938501
816A0326M000
IC: EEPROM
BR93CS46-2-NW
RSPL
3.2.06
104 *
51007701
3PB4043-4357P1
Guide: Bottom
(Mylar)
N/A
105 *
51007601
N/A
Guide: Cut Sheet
(Mylar)
N/A
106 *
51007801
N/A
Guide: Bottom
Plate (Mylar)
N/A
107
51007901
3PB4043-4227P1
Base: (Mylar)
Bottom Rear Guide
N/A
108
52103601
N/A
Cartridge: Ribbon
(Black)
Consumable
3.2.01
108
52103701
N/A
Cartridge: Ribbon
(Color)
Consumable
3.2.01
108
52103801
N/A
Cartridge: Film
Ribbon (Black)
Consumable
3.2.01
123
50212601
3PA4016-4722G1
Cover: Acoustic
(Pull Tractor)
Option
N/A
123
50212604
2PA4016-4722G4
Cover: Acoustic
(Pull Tractor)
Option RSPL
N/A
125
53482901
N/A
Lever: Bail
3.2.04
187
56301703
Fuse: 2A 125 V
3.2.06
* Items 104, 105, and 106 are in the same location.
Item 104, Bottom Guide (Mylar) is the largest mylar sheet.
Item 105, Cut Sheet Guide (Mylar) is the smallest mylar sheet.
Item 106, Bottom Guide Plate (Mylar) is the mylar sheet which extends from the bottom of the printer
mechanism.
* * When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS.
Replacement printed circuit boards are shipped WITHOUT these items.
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD)
safety precautions or you may damage the components.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 176
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.05 Operator Panel Assembly
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
6
55050601
4YA4042-1473G1
PCB: Operator
Panel (LQSX)
RSPL
3.2.05
7
53479103
3PP4043-2712G3
Panel: Operator
RSPL
3.2.05
8
56614608
LP-5466-8
Cable: Operator
Panel
RSPL
3.2.05
11
50910505
4LB-192200-5
Spring: Cover Open
RSPL
3.2.05
35
56614301
4YX4043-2759G1
Cable: Microswitch
(Cover Open)
RSPL
3.2.05 19
129
53535301
3PP4016-5387P1
Lever: Cover Open
3.2.05
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Page: 177
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.06 Printer Mechanism - Monochrome (1 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
9
55050501
4YA4042-1462G1
PCB: Sensor
(LQEW or LPRW)
RSPL
3.2.12
10
56619101
4YS4011-4321P1
Cable: Sensor
Board Connection
RSPL
3.2.12
22
56506201
3YX4043-2550G1
Motor: Space
Assembly
RSPL
3.2.14
23
56508401
3PB4043-3853P1
Motor: Line Feed
Assembly
RSPL
3.2.10
24
51302790
4LP-1313-239
Belt: Mini Pitch (Line
Feed)
RSPL
3.2.09
25
50054101
4PA4043-2556G1
Platen: (Assembly)
RSPL
3.2.09
26
51214501
3PP4043-2466P1
Gear: Platen - A
RSPL
3.2.09
27
51215001
4PP4043-2465G1
Pulley: Platen
RSPL
3.2.09
28
50054501
3YX4043-2561G1
Tractor: Push (Left)
Assembly
RSPL
3.2.21
29
50054601
3PA4043-2562G1
Tractor: Push
(Right) Assembly
RSPL
3.2.21
30
51002301
4PP4043-2451P1
Friction: Piece
RSPL
3.2.21
31
51002401
3PP4043-2452P1
Guide: Center
Upper
RSPL
3.2.21
32
51002501
3PP4043-2453P1
Guide: Center
Lower - A
RSPL
3.2.21
33
51002601
3PP4043-2454P1
Guide: Center
Lower - B
RSPL
3.2.21
34
56209901
4YX4043-2784G1
Switch: Micro (Adj
and Rel Lever)
RSPL
3.2.20
36
50907502
4LB-193400-1
Spring: (Paper
Chute)
RSPL
3.2.19
37
53478706
3PP4043-2459P6
Lever: Release
RSPL
3.2.19
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Page: 178
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.07 Printer Mechanism - Monochrome (2 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
38
53063801
3PP4043-4224P1
Bracket: PH Gap
Indication
39
50910201
4PB4043-2754P1
Spring: Detent
(Release Lever)
RSPL
3.2.19
40
55034801
4YX4043-2576G1
Sensor: Cut-Sheet
Paper-End
RSPL
3.2.19
41
51214401
4PP4043-2458P1
Gear: Idle (Release
Lever)
RSPL
3.2.09
42
50910305
4LB-190600-6
Spring: Idle Gear
RSPL
3.2.09
43
51214201
4PP4043-2456P1
Gear: Drive - A
RSPL
3.2.21
44
51214301
4PP4043-2457P1
Gear: Drive - B
RSPL
3.2.21
45
50054301
4PA4043-2584G1
Assembly: Ribbon
Feed
RSPL
3.2.13
46
50910701
4PP4043-2628P1
Spring: Bail Arm
(Left)
RSPL
3.2.17
47
50910801
4LB-193100-2
Spring: Bail Arm
(Right)
RSPL
3.2.17
48
56506301
3PP4043-2601P1
Motor: Step (Bail
Arm) Assembly
RSPL
3.2.16
49
51210201
5LR-193134-1
Gear: Idle (Bail Arm)
RSPL
3.2.17
50
53478401
3PP4043-2504P1
Lever: Printhead
Gap Adjust
RSPL
3.2.18
51
50054401
4PA4043-2711G1
Assembly: Indicator
Shaft
RSPL
3.2.17
52
53478501
3PP4043-2509P1
Arm: Left Bail
RSPL
3.2.17
53
53478502
3PP4043-2510P1
Arm: Right Bail
RSPL
3.2.17
54
51214701
3PP4043-2764P1
Cam: Bail Open
(Black)
RSPL
3.2.17
3.2.20
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Page: 179
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.08 Printer Mechanism - Monochrome (3 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
99
50512923
5K-2542-23
Rubber Grommet (in
base)
RSPL
3.2.08
101
50703701
4PP4043-2507P1
Collar: Eccentric
(Carr. Rail) Head
Adjustment
RSPL
3.2.18
102
53478801
4PP4043-2460P1
Block: Release
Lever Guide
RSPL
3.2.19
109
N/A
N/A
Rear Guide
3.2.19
110
50082001
2YX4043-2570G1
Assembly: Paper
Chute
3.2.19
111
51005401
3PP4043-2548P1
Beam: Slide
N/A
112
51215601
4PP4043-2596G1
Pulley: Idle
3.2.15
113
53327801
4PP4044-1282P1
Shaft: Idle Pulley
3.2.15
114
51110301
4PP4043-2565P1
Shaft: Carriage
3.2.18
115
50705701
4PB4043-2599P1
Ring: Cushion
(Stopper)
3.2.18
116
50213301
N/A
Frame: Base
3.2.08
117
51605001
N/A
Bearing: Platen
3.2.09
118
51007701
3PB4043-4357P1
Guide: Bottom
(Mylar)
N/A
166
50705603
RE3-SK
Snap
3.2.09
167
51605101
4PP4043-2455P1
Bushing
3.2.21
168
53529001
Lever: Near End
(Bottom)
169
54123804
2W4-HH
Washer
3.2.09
Platen Lever
3.2.09
181
182
Cartridge Bracket
3.2.11
B.2.13
183
Pressure Bar
3.2.19
184
Locking Shaft
3.2.21
185
Upper Drive Shaft
3.2.21
186
Lower Drive Shaft
3.2.21
,
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.09 Printer Mechanism - Color (1 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
10
56619101
4YS4011-4321P1
Cable: Sensor
Board Connection
RSPL
3.2.12
22
56506201
3YX4043-2550G1
Motor: Space
Assembly
RSPL
3.2.14
23
56508401
3PB4043-3853P1
Motor: Line Feed
Assembly
RSPL
3.2.10
24
51302790
4LP-1313-239
Belt: Mini Pitch (Line
Feed)
RSPL
3.2.09
25
50054101
4PA4043-2556G1
Platen: (Assembly)
RSPL
3.2.09
26
51214501
3PP4043-2466P1
Gear: Platen - A
RSPL
3.2.09
27
51215001
4PP4043-2465G1
Pulley: Platen
RSPL
3.2.09
28
50054501
3YX4043-2561G1
Tractor: Push (Left)
Assembly
RSPL
3.2.21
29
50054601
3PA4043-2562G1
Tractor: Push
(Right) Assembly
RSPL
3.2.21
30
51002301
4PP4043-2451P1
Friction: Piece
RSPL
3.2.21
31
51002401
3PP4043-2452P1
Guide: Center Upper
RSPL
3.2.21
32
51002501
3PP4043-2453P1
Guide: Center Lower
-A
RSPL
3.2.21
33
51002601
3PP4043-2454P1
Guide: Center Lower
-B
RSPL
3.2.21
34
56209901
4YX4043-2784G1
Switch: Micro (Adj
and Rel Lever)
RSPL
3.2.20
36
50907502
4LB-193400-1
Spring: (Paper
Chute)
RSPL
3.2.19
37
53478706
3PP4043-2459P6
Lever: Release
RSPL
3.2.19
38
53063801
3PP4043-4224P1
Bracket: PH Gap
Indication
39
50910201
4PB4043-2754P1
Spring: Detent
(Release Lever)
3.2.20
RSPL
3.2.19
40
55034801
4YX4043-2576G1
Sensor: Cut-Sheet
Paper-End
RSPL
3.2.19
41
51214401
4PP4043-2458P1
Gear: Idle (Release
Lever)
RSPL
3.2.09
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Page: 181
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.10 Printer Mechanism - Color (2 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
42
50910305
4LB-190600-6
Spring: Idle Gear
RSPL
3.2.09
43
51214201
4PP4043-2456P1
Gear: Drive - A
RSPL
3.2.21
44
51214301
4PP4043-2457P1
Gear: Drive - B
RSPL
3.2.21
45
50054301
4PA4043-2584G1
Assembly: Ribbon
Feed
RSPL
3.2.13
46
50910701
4PP4043-2628P1
Spring: Bail Arm
(Left)
RSPL
3.2.17
47
50910801
4LB-193100-2
Spring: Bail Arm
(Right)
RSPL
3.2.17
48
56506301
3PP4043-2601P1
Motor: Step (Bail
Arm) Assembly
RSPL
3.2.16
49
51210201
5LR-193134-1
Gear: Idle (Bail Arm)
RSPL
3.2.17
50
53478401
3PP4043-2504P1
Lever: Printhead
Gap Adjust
RSPL
3.2.18
51
50054401
4PA4043-2711G1
Assembly: Indicator
Shaft
RSPL
3.2.17
52
53478501
3PP4043-2509P1
Arm: Left Bail
RSPL
3.2.17
53
53478502
3PP4043-2510P1
Arm: Right Bail
RSPL
3.2.17
70
51222501
2PP4043-3325P1
Cam: Ribbon Shift
(Color)
RSPL
3.2.27
71
51215101
4PP4043-2729P1
Gear: Ribbon Shift
(Color)
RSPL
3.2.27
72
50054701
4PA4043-2710G1
Lever: Shift Cam
(Color)
RSPL
3.2.28
77
50312103
4LB-130100-3A
Screw: Shoulder
Left (Color)
RSPL
3.2.11
3.2.13
,
78
50312106
4LB-130100-6A
Screw: Shoulder
Right (Color)
RSPL
3.2.11
3.2.13
,
80
50910601
4PP4043-2642P1
Spring: Ribbon
Cartridge Balance
(Color)
RSPL
3.2.11
3.2.13
,
81
51222601
3PP4043-3321P1
Cam: Bail Open
(Color)
RSPL
3.2.26
82
51214601
4PP4043-2499P1
Gear: Bail Open
(Color)
RSPL
3.2.26
83
55050502
4YA4042-1462G2
PCB: Sensor
(LQEW-2) (Color)
RSPL
3.2.12
97
50910901
4PB4043-3240P1
Spring: Brake - A
RSPL
3.2.27
98
50911001
4PP4043-2783P1
Spring: Brake - B
(Color)
RSPL
3.2.26
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 182
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.11 Printer Mechanism - Color (3 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
]
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
99
50512923
5K-2542-23
Rubber Grommet (in
base)
RSPL
3.2.08
101
50703701
4PP4043-2507P1
Collar: Eccentric
(Carr. Rail) Head
Adjustment
RSPL
3.2.18
102
53478801
4PP4043-2460P1
Block: Release
Lever Guide
RSPL
3.2.19
109
N/A
N/A
Rear Guide
3.2.19
110
50082001
2YX4043-2570G1
Assembly: Paper
Chute
3.2.19
111
51005401
3PP4043-2548P1
Beam: Slide
N/A
112
51215601
4PP4043-2596G1
Pulley: Idle
3.2.15
113
53327801
4PP4044-1282P1
Shaft: Idle Pulley
3.2.15
114
51110301
4PP4043-2565P1
Shaft: Carriage
3.2.18
115
50705701
4PB4043-2599P1
Ring: Cushion
(Stopper)
3.2.18
116
50213301
N/A
Frame: Base
3.2.08
117
51605001
N/A
Bearing: Platen
3.2.09
118
51007701
3PB4043-4357P1
Guide: Bottom
(Mylar)
N/A
166
50705603
RE3-SK
Snap
3.2.09
167
51605101
4PP4043-2455P1
Bushing
3.2.21
168
53529001
Lever: Near End
(Bottom)
169
54123804
2W4-HH
Washer
3.2.09
Platen Lever
3.2.09
Cartridge Bracket
3.2.11
3.2.13
Pressure Bar
3.2.19
Locking Shaft
3.2.21
Upper Drive Shaft
3.2.21
Lower Drive Shaft
3.2.21
,
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 183
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.12 Carriage Assembly - Monochrome
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
55
51303101
4PB4044-1492P3
Belt: Mini Pitch
(Space)
RSPL
3.2.15
56
56614201
3YX4043-2713G1
Cable: Printhead
Assembly
RSPL
3.2.11
57
53055901
4PP4043-2643G1
Guide: Ribbon
(Black)
RSPL
3.2.02
58
53527001
4PP4043-3954G1
Protector: Ribbon
RSPL
3.2.03
92
50702301
LR-193368-1
Clamp: Belt
RSPL
3.2.15
94
N/A
N/A
Clamp
96
50057601
2YX4043-2610G3
Carriage: Black
Assembly
119
N/A
N/A
Spacer: Round
3.2.18
120
51005501
4PP4044-1340P1
Guide: Slide
3.2.18
3.2.11
RSPL
3.2.18
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 184
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.13 Carriage Assembly - Color
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
55
51303101
4PB4044-1492P3
Belt: Mini Pitch
(Space)
RSPL
3.2.15
56
56614201
3YX4043-2713G1
Cable: Printhead
Assembly
RSPL
3.2.11
58
53527001
4PP4043-3954G1
Protector: Ribbon
RSPL
3.2.03
73
53478901
4PP4043-2776G1
Arm: Ribbon Shift
(Color)
RSPL
3.2.23
74
53479001
4PP4043-2741G1
Lever: Roller (Color)
RSPL
3.2.24
75
50315401
4PP4043-2745P1
Screw (Color)
RSPL
3.2.23
76
50917811
4LB-192400-11
Spring: Ribbon Shift
Arm (Color)
RSPL
3.2.23
79
53056002
3PP4043-2477P2
Guide: Ribbon
(Color)
RSPL
3.2.25
92
50702301
LR-193368-1
Clamp: Belt
RSPL
3.2.15
93
N/A
N/A
Screw
3.2.24
94
N/A
N/A
Clamp
3.2.11
95
50069401
2YX4043-2719G3
Carriage: Color
Assembly
RSPL
3.2.18
100
50605701
4PP4043-2615P1
Post: Ribbon Guide
(Color)
RSPL
3.2.25
119
N/A
N/A
Spacer: Round
3.2.18
120
51005501
4PP4044-1340P1
Guide: Slide
3.2.18
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 185
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.14 Options
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
60
70011701
2PA4016-4722G4
Pull Tractor
Assembly w/
Acoustic Cover
Option
N/A
61
70010201
4YA4042-1301G101
Gothic Font
Cartridge
Option
3.2.04
62
70010101
4YA4042-1301G102
Prestige Font
Cartridge
Option
3.2.04
63
70016401
4YA4042-1470G101
Cartridge: 32 Kbyte
RAM Expansion
Option
3.2.04
121
70014901
N/A
Windows Driver
Software
Option 393
N/A
122
70012201
N/A
Microline Control
Emulation Software
Option 393
N/A
123
50212601
3PA4016-4722G1
Cover: Acoustic
(Pull Tractor)
Option
N/A
123
50212604
2PA4016-4722G4
Cover: Acoustic
(Pull Tractor)
Option RSPL
N/A
124
53480901
N/A
Cut Sheet Feeder
Output Tray
Option
N/A
130
55033301
4YA4042-1301G101
Font Cart: Gothic
(393)
Option
N/A
130
55033401
4YA4042-1301G102
Font Cart: Prestige
(393)
Option
N/A
131
56406301
4YB4049-1278P1
Power Supply (220
v)
Option
3.2.22
132
56610801
3YS4011-1052P1
Cord: Line 220 V
(393)
Option
N/A
133
56616501
3YS4011-1192P1
Cord: AC 240 V
(393)
Option
N/A
134
70000803
N/A
Kit: Parallel
Interface Plug'n'Play
Accessory
Option Both
3.2.01
3.2.04
135
70010601
N/A
Cut Sheet Feeder
30001 Single Bin
Option
3.2.29
136
70010701
N/A
Cut Sheet Feeder
30002 Dual Bin
Option
3.2.29
,
137
70012801
N/A
Kit: RS232-C Serial
Interface
Option Both
3.2.01
3.2.04
,
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 186
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.15 Pull Tractor Assembly (Option)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
90
50057401
4PA4043-2684G1
Tractor: Pin (Left)
Pull Tractor
Assembly
Option
N/A
91
50057501
4PA4043-2685G1
Tractor: Pin (Right)
Pull Tractor
Assembly
Option
N/A
170
50315501
+T2P3-8-HHC-V
Screw: Tapping
N/A
171
50514501
4PP4043-2688P1
Washer
N/A
172
50705605
RE5-SK
Snap
N/A
173
50918801
4PP4025-1341
Spring: Reset
N/A
174
50918901
4PB4043-2691P1
Spring
N/A
175
51223401
4PP4043-2690P1
Gear: Idle
N/A
176
53535401
4PP4043-2696P1
Lever: Lock
N/A
177
53535501
2PP4043-2687P1
Frame: Side (Right)
N/A
178
53535601
2PP4043-2686P1
Frame: Side (Left)
N/A
179
54123306
+P(SW+W)3-6-23D
Screw
N/A
180
51223501
4PP4043-2689P1
Gear: Drive
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 187
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.16 Packing Materials
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
138
53460209
Overpack ML393+
N/A
139
53477201
Box: ML393 Epson
N/A
140
53477202
Box: ML393 Epson /
IBM
N/A
141
53481001
End Cap (Left)
ML393
N/A
142
53481001
End Cap (Right)
ML393
N/A
143
53528901
End Cap (Left)
ML393+
N/A
144
53528902
End Cap (Right)
ML393+
N/A
145
53532001
Box: ML393+
N/A
146
53532101
Box: ML393+ Color
N/A
147
53532501
Foam Spacer
ML393+
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 188
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.17 Consumables
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
108
52103601
N/A
Cartridge: Ribbon
(Black)
Consumable
3.2.01
108
52103701
N/A
Cartridge: Ribbon
(Color)
Consumable
3.2.01
108
52103801
N/A
Cartridge: Film
Ribbon (Black)
Consumable
3.2.01
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 189
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.18 Documentation
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1A#
58214701D
N/A
Kit: Service Training
Microline 393
Document Includes 1
-7A
N/A
1B#
58218601
N/A
Kit: Microline
393-Plus/393C-Plus
Service Training
Document Includes 2
- 14 B
N/A
1C#
58218602
N/A
Kit: Microline
393-Plus/393C-Plus
Service Training
Document Includes 2
-7C
N/A
188
58057001
N/A
Guide: Customer
Service Microline
393/393C-Plus
Document
N/A
189
59227204
N/A
Manual:
Maintenance
Microline 393
Document
N/A
190
59227303
N/A
Manual:
Troubleshooting
Microline 393
Document
N/A
191
59227401
N/A
Manual:
Maintenance
Cut-Sheet Feeder
3001/3002
Document
N/A
191
59227402
N/A
Manual:
Maintenance
Cut-Sheet Feeder
3001/3002
Document
N/A
192
59240301
N/A
Product
Specifications
Microline
393/393C-Plus
Document
N/A
193
59240901
N/A
Guide: Setup
Microline
393/393C-Plus
Document
N/A
193
59240902
N/A
Guide: Setup
Microline
393/393C-Plus
Document
N/A
194
59241001
N/A
Guide: Reference
Microline
393/393C-Plus
Document
N/A
194
59241002
N/A
Guide: Reference
Microline
393/393C-Plus
Document
N/A
195
59241301
M-520780 Issue 1B
Manual:
Maintenance
Microline
393/393C-Plus
Document
N/A
196
59241401
N/A
Manual:
Troubleshooting
Microline
393/393C-Plus
Document
N/A
* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed
form to Okidata Marketing Communications.
* * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center
Reference Guide for information on contacting Okidata.
# Refer to Section B.2.19 of this Service Handbook.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer
to B.1.02
Disassembly
Procedure
197
58067201
N/A
ABCD Warranty
Claim Forms (Pkg of
20)
Document Both
N/A
198 *
N/A
N/A
Marketing Literature
Document Both
N/A
199 **
N/A
N/A
Okidata Marketing
Literature Order
Form
Document Both
N/A
200
N/A
N/A
Okidata Service
Center Reference
Guide
Document Both
N/A
201
53547501
N/A
Okidata Support
3-Ring Binder
Document Both
N/A
202
N/A
N/A
Printer Drivers
Refer to Okilink
N/A
203
N/A
N/A
Product Updates
Document Refer to
Okilink
N/A
204
N/A
N/A
Recommended
Spare Parts List
Document Refer to
Okilink
N/A
205
N/A
N/A
Software
Refer to Okilink
N/A
206
N/A
N/A
Technical Service
Bulletins
Document Refer to
Okilink
N/A
207
58052401
N/A
Warranty Summary
Forms (Pkg of 20)
Document Both
N/A
* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed
form to Okidata Marketing Communications.
* * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center
Reference Guide for information on contacting Okidata.
# Refer to Section B.2.19 of this Service Handbook.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 190
Service Guide ML393/ML393CPlus
Chapter B Illustrated Parts Listing
B.2.19 Service Training Kit Revision List
P/N 58218601 Microline 393-Plus / 393C-Plus Service Training Kit
This kit was replaced by P/N 58218602.
Except for the Customer Service, Reference, and Setup Guides and the Cut Sheet Feeder Maintenance
Manual, items in the training kit are NOT available separately.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1B
58218601
N/A
Kit: Microline
393-Plus/393C-Plus
Service Training
Document Includes 2
- 14 B
N/A
2B
52043101
N/A
Label: Kit
Document Part of 1
B
N/A
3B
58057901
N/A
Letter: Cover
Document Part of 1
B
N/A
4B
59241701
N/A
Guide: Study
Document Part of 1
B
N/A
5B
59241601
N/A
Manual: Training
Document Part of 1
B
N/A
6B
58057001
N/A
Guide: Customer
Service
Document Part of 1
B
N/A
7B
59251001
N/A
Guide: Microline
393/393C-Plus
Reference
Document Part of 1
B
N/A
8B
59240901
N/A
Guide: Microline
393/393C-Plus Setup
Document Part of 1
B
N/A
9B
59227402
N/A
Manual:
Maintenance
Cut-Sheet Feeder
3001/3002
Document Part of 1
B
N/A
10 B
57516401
N/A
Video: Service
Training
Document Part of 1
B
N/A
11 B
52043102
N/A
Label: Videotape
Case
Document Part of 1
B
N/A
12 B
52043102
N/A
Label: Videotape
Front
Document Part of 1
B
N/A
13 B
53533001
N/A
Storage Box
Document Part of 1
B
N/A
14 B
57517101
N/A
Red Vinyl Case
(VHS) Video
Document Part of 1
B
N/A
P/N 58218602 Microline 393-Plus / 393C-Plus Service Training Kit
This kit replaces P/N 58218601.
Except for the Reference and Setup Guides, items in the training kit are NOT available separately.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1C
58218602
N/A
Kit: Microline
393-Plus/393C-Plus
Service Training
Document Includes 2
-7C
N/A
2C
52043103
N/A
Label: Kit
Document Part of 1
C
N/A
3C
58057902
N/A
Read Me First
Document Part of 1
C
N/A
4C
59241602
N/A
Handbook: Service
Document Part of 1
C
N/A
5C
59251002
N/A
Guide: Microline
393/393C-Plus
Reference
Document Part of 1
B
N/A
6C
59240902
N/A
Guide: Microline
393/393C-Plus Setup
Document Part of 1
B
N/A
7C
57516402
N/A
Video: Service
Training
Document Part of 1
C
N/A
8C
52043104
N/A
Label: Videotape
Spine
Document Part of 1
C
N/A
9C
53570401
N/A
Sleeve: Videotape
(Cardboard)
Document Part of 1
C
N/A
P/N 58215601 Microline 300 Series Service Training Kit
This kit was replaced by P/N 58215602.
This kit covered the printers listed below. Each printer had its own training package within the Microline
300 Series Training Kit, P/N 58215601.
Microline 320/321 P/N 58215501B
Microline 390/391 P/N 59230701B
Microline 393 P/N 58214701D
Except for the Customer Service, Reference, and Setup Guides and the Cut Sheet Feeder Maintenance
Manual, items in the training kit are NOT available separately.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1X
58215601
N/A
Kit: Service Training
Microline 300 Series
Document Includes
1YZA
N/A
1Y
58215501B
N/A
Kit: Service Training
Microline 320/321
Document Includes
2-7Y
N/A
1Z
59230701B
N/A
Kit: Service Training
Microline 390/391
Document Includes
2-8Z
N/A
1A
58214701D
N/A
Kit: Service Training
Microline 393
Document Includes
2-8 A
N/A
P/N 58215501B Microline 320/321 Service Training Kit
This kit was replaced by P/N 58215502.
This kit was part of the Microline 300 Series Training Kit, P/N 58215601.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1Y
58215501B
N/A
Kit: Service Training
Microline 320/321
Document Includes 2
-7Y
N/A
2Y
58046101
N/A
Cover Letter:
Microline 320/321
Document Part of 1
Y
N/A
3Y
58045301
N/A
Guide: Customer
Service Microline
320/321
Document Part of 1
Y
N/A
4Y
59231501
N/A
Manual: Training
Microline 320/321
Document Part of 1
Y
N/A
5Y
59231601
N/A
Guide: Self-Study
Microline 320/321
Document Part of 1
Y
N/A
6Y
59230801
N/A
Guide: Setup
Microline 320/321
Document Part of 1
Y
N/A
7Y
59231401
N/A
Guide: Reference
Microline 320/321
Document Part of 1
Y
N/A
P/N 59230701B Microline 390/391 Service Training Kit
This kit was replaced by P/N 59230702.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1Z
59230701B
N/A
Kit: Service Training
Microline 390/391
Document Includes 2
-8Z
N/A
2Z
58045401
N/A
Cover Letter:
Microline 390/391
Document Part of 1 Z
N/A
3Z
59230501
N/A
Guide: Self-Study
Microline 390/391
Document Part of 1 Z
N/A
4Z
58044501
N/A
Guide: Customer
Service Microline
390/391
Document Part of 1 Z
N/A
5Z
59230202
N/A
Guide: Setup
Microline 390/391
Document Part of 1 Z
N/A
6Z
59230301
N/A
Guide: Reference
Microline 390/391
Document Part of 1 Z
N/A
7Z
59230601
N/A
Manual: Training
Microline 390/391
Document Part of 1 Z
N/A
8Z
59231001
M-520656 Issue 1A
Manual:
Maintenance
Cut-Sheet Feeder
3000
Document Part of 1 Z
N/A
P/N 58214701D Microline 393 Service Training Kit
This kit was replaced by P/N 58218601.
Item
Okidata P/N
Oki-J P/N
Description
Comments Refer to
B.1.02
Disassembly
Procedure
1A
58214701D
N/A
Kit: Service Training
Microline 393
Document Includes
2-8 A
N/A
2A
58042103
N/A
Cover Letter
Microline 393
Document Part of 1
A
N/A
3A
58041703
N/A
Guide: Customer
Service Microline
393
Document Part of 1
A
N/A
4A
59227003
N/A
Guide: Setup
Microline 393
Document Part of 1
A
N/A
5A
59232601
N/A
Guide: Reference
Epson/IBM
Compatible Microline
393
Document Part of 1
A
N/A
6A
59229001
N/A
Guide: Self-Study
Microline 393
Document Part of 1
A
N/A
7A
59228001
N/A
Package: Training
Microline 393
Document Part of 1
A
N/A
8A
59227402
M-520565 2D
Manual:
Maintenance
Cut-Sheet Feeder
3001/3002
Document Part of 1
A
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 191
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.1 OVERVIEW
C.1.01 General Information
This appendix covers the specifications for the Microline 393 and Microline 393C printers. This information
is provided for those technicians who work with these models.
The Microline 393 and Microline 393C are high speed, dot matrix printers, which utilize a 24-pin printhead.
The Microline 393 is a standard version, single color output.
The Microline 393C is a color capable version.
The printers are capable of emulating the Epson LQ-2550 or the IBM XL24 printers.
Both an RS232-C Serial Interface and a Centronics Parallel Interface are standard.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 192
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.2 PRINTER SPECIFICATIONS
C.2.01 Interface Methods
Both are available
Centronics Parallel Interface
RS232-C Serial Interface
C.2.02 Line Feed Increments
1/6"
1/8"
n/60"
n/180"
n/360"
C.2.03 Line Feed Time
55 ms @ 6 LPI
8.0 IPS (inches per second) slew rate @ gap 1,2
6.0 IPS (inches per second) slew rate @ gap 3+
C.2.04 Paper Feed Method
Built-in push tractor
Friction feed
C.2.05 Paper Out Detection
Distance from end of paper
Rear Feed: 2.3"
Bottom Feed: .94"
Cut Sheet: .93"
C.2.06 Paper Path
Bottom Feed
Rear Feed
Top Feed
C.2.07 Printhead Type
Staggered, 24 pin, stored energy printhead
C.2.08 Standard Fonts
Utility (Used in Utility and High Speed Draft Modes
Courier
Helvette
Roman
Orator
C.2.09 Symbol Sets
Standard ASCII
Epson Character Set
IBM Character Set I and Set II
IBM Proprinter All Character Set
International Characters
Line Graphics
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 193
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.3 PAPER SPECIFICATIONS
C.3.01 Types
Letter
Legal
Labels - Bottom feed only
Continuous Forms
C.3.02 Weight
12 - 24 lb.
16 - 24 lbs (Cut Sheet Feeders)
C.3.03 Number of Copies
1-4
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 194
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.4 PHYSICAL SPECIFICATIONS
C.4.01 Printer Dimensions
Width: 16.42"
Height: 7.09"
Depth: 22.44"
C.4.02 Printer Weight
37 lbs.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 195
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.5 POWER REQUIREMENTS
C.5.01 Input Power
Input Voltage
120 VAC +10%, -15%
220/240 +10%, -15%
Frequency
50/60 hz. +/-2%
C.5.02 Power Consumption
180 VA during Self-Test
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 196
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.6 ENVIRONMENTAL CONDITIONS
C.6.01 Ambient Temperature and Relative Humidity
While in operation: 41°F to 104°F @ 20% - 80 % Relative Humidity
While in storage: -40°F to 158°F @ 5% - 95% Relative Humidity
C.6.02 Printer Noise Level (10 cpi - LQ Mode)
Standard noise level: 58 dba
Quite mode noise level: 55 dba
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 197
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.7 AGENCY APPROVALS
C.7.01 Listings
North America
FCC Class B
UL 478 (Office Machines and Business Equipment)
CSA 22.2 154
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 198
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.8 OPTIONS
C.8.01 Font Cartridges
Prestige
Gothic
C.8.02 RAM Cartridge
32 Kbytes
C.8.03 Cut Sheet Feeders
CSF 3001 - Single bin Cut Sheet Feeder
CSF 3002 - Dual bin Cut Sheet Feeder
C.8.04 Pull Tractor Assembly
The Pull Tractor Assembly is required for bottom feeding.
A Pull Tractor Assembly must be used to feed labels
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 199
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.9 CONSUMABLES
C.9.01 Ribbon
Black Cartridge (Microline 393 and Microline 393C)
Type: Fabric Ribbon
Ribbon Life: 5 million characters
Color Cartridge (Microline 393C)
Type: Four band color ribbon (Yellow, Magenta, Cyan, Black)
Black: 2.3 million characters Ribbon Life
Cyan: 1.8 million characters Ribbon Life
Magenta: 1.8 million characters Ribbon Life
Yellow: 1.3 million characters Ribbon Life
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 200
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.10 MEMORY SPECIFICATIONS
C.10.01 ROM
Resident: Program ROM = 128 Kbytes
Resident Fonts = 384 Kbytes
Optional Font Cartridges = 64 Kbytes each
C.10.02 RAM
Total RAM = 64 Kbytes
Print Buffer = 23 Kbytes
IBM I/F Buffer = 0 Kbyte minimum
Epson I/F Buffer = 8 Kbyte minimum
DLL Buffer = 0 to 32 Kbytes
C.10.03 EEPROM
Internal Control, Menu = 256 bits
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 201
Service Guide ML393/ML393CPlus
Chapter C Microline 393/393C Specifications
C.11 PRINTER RELIABILITY
C.11.01 Mean Time Before Failure (MTBF)
4,000 hours @ 25% Duty Cycle, 35% Page Density
C.11.02 Mean Time To Repair (MTTR)
15 minutes @ major sub-assembly level
C.11.03 Printer Life
12,000 hours @ 25% Duty, 35% Page Density
C.11.04 Printhead Life
200 Million Characters (average) @ 10 cpi Draft Mode @ 25% Duty Cycle, 35% Page Density
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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