Atari 1020 Color Printer Service Manual

 ATARI
1020! М Color Printer
Field Service Manual
Atari believes that the information described in this manual is accurate and reliable,
and much care has been taken in its preparation. However, no responsibility, financial
or otherwise, shall be accepted for any consequences arising out of the use of this
material. Information contained herein is subject to change. Revisions may be issued
to advise of such changes and/or additions.
Correspondence regarding this document should be forwarded to Director of Technical
Support, Consumer Product Service, Atari, Incorporated, 345 W. Maude Avenue,
Sunnyvale, CA 94036.
Section
Atari 1020 Color Printer
Field Service Manual
TABLE OF CONTENTS
Title
INTRODUCTION
THEORY OF OPERATION
Overview
User Interface
Mechanical
Case
Frame
Print Head Mechanism
Paper Feed Mechanism
Pen Up-Down Mechanism
Pen-up State
Pen-down State
Color Change Mechanism
Pen Ejection Mechanism
Detection Mechanism for
Color Position and Home
Position
Electronic
Power Supply Circuit
Noise Limit Capacitors
Serial/Parallel Microprocessor (Al)
Circuit
Printer Controllor Microprocessor (A2)
Circuit
Print Head Motor and
Paper Feed Motor Drive Circuit
Pen Up-Down Solenoid
Drive Circuit
Color Detect Switch Circuit
Paper Feed Switch Circuit
Color Change Switch Circuit
Pen Change Switch Circuit
Power ON Reset Circuit
Oscillator Circuits
SCHEMATICS & SILKSCREENS (attached
to front cover)
TESTING
Equipment Required
Diagnostic Procedure
Setting up the 1020 for testing
and using CPS Diagnostic Diskette
with file T1020.BAS
Internal Test
Operator Test
Pen Up-Down Troubleshooting Program
Print Head (Carriage)Motor
Troubleshooting Program
iii
1-3
1-4
1-4
1-7
1-7
1-7
1-7
1-7
1-7
1-7
1-8
3-7
Atari 1020 Color Printer
Field Service Manual
Title
Paper Feed (Platen)
Motor Troubleshooting Program
Specific Command Cede Failures
DIAGNOSTIC FLOWCHARTS
Qverview
Swapout Procedure
Replace In Order
Atari Repair Hotline
SYMPTOM CHECKLIST
DISASSEMBLY/ASSEMBLY
Equipment Required
Preventive Maintenance
Adjustments
Disassembly
Case Disassembly/Switch Assembly
Removal
Printer Module Removal
Electromagnet Assembly (Solenoid)
Removal and Replacement
Actuator and Coupling Lever
Adjustment
Pen and Paper Platen Adjustment
Reed Switch Removal and Replacement
Color Change Click Removal and
Replacement
Motor Cover, Print Head Motor and Paper
Page
3-8
2-10
4-1
4-1
4-1
4-1
4-1
6-1
6-1
6-1
6-1
6-4
6-4
6-4
6-5
6-5
6-6
6-7
6-7
Feed Motor Removal and Replacement 6-8
Rotary Pen Holder Removal and
Replacement
Stopper Click Removal and Replacement
Paper Feed Idle Gear Removal and
Replacement
Ejection Lever Spring Removal and
Replacement
Paper Holding Roller (Upper) Removal
and Replacement
Print Head Idle Gear Removal and
Replacement
PC Board Removal
Assembly
PC Board Replacement
Printer Module Replacement
Switch Assembly Replacement, Case
Assembly
PARTS LIST
SERVICE BULLETINS
iv
6-9
6-9
6-10
6-10
6-10
6-11
6-11
6-12
6-12
6-12
6-12
7-1
3-1
Table
3-1
A]
Atari 1020 Color Printer
Field Service Manual
LIST OF ILLUSTRATIONS
Title
1020 Color Printer Block Diagram
1020 Color Printer Front View
1020 Color Printer Back View
1020 Color Printer Final Assembly
1020 Color Printer Mechanical Assembly
Power Supply Circuit
Pen-Up Circuit
Pen-Down Circuit
1020 Color Printer Silkscreen
1020 Color Printer Schematic
CPS Diagnostic Diskette
Sample Printout (Text Mode)
CPS Diagnostic Diskette
Sample Printout (Graphic mode)
Internal Test Sample printout
Operator Test Sample Printout
1020 Color Printer Mechanical Assembly
1020 Color Printer Final Assembly
Actuator/Coupling Lever Adjustment
Pen and Paper Platen Adjustment
Motor Cover Removal
LIST OF TABLES
Title
Character Command Code Table
Pen Up-Down Transistor Check
Page
1-2
1-3
1-4
1-5
1-6
1-9
1-11
1-11
2-3
2-5
3-4
3-5
3-10
6-2
6-3
6-6
6-6
6-8
INTRODUCTION
The Atari 1020! M Color Printer Field Service Manual is a reference guide for the
service technician. The information presented in this manual, when used in
conjunction with ATARI training, enables you to repair and maintain the 1020 Color
Printer.
This Field Service Manual is organized in eight sections:
e THEORY OF OPERATION - Overview of how the 1020 Color Printer works
and what its basic assemblies look like.
e SCHEMATICS AND SILKSCREENS - Printed Circuit Board layout and
electrical drawing.
e TESTING - Review of tests available for diagnosing 1020 Color Printer
problems.
e DIAGNOSTIC FLOWCHARTS - Aids for troubleshooting the 1020 Color
Printer.
® SYMPTOM CHECKLIST - Failure information to assist the experienced
technician arrive at a rapid diagnosis of 1020 Color Printer problems.
® DISASSEMBLY/ASSEMBLY - Procedures for disassembling and assembling
the 1020 Color Printer.
e PARTS LIST - Breakdown of parts used to repair the 1020 Color Printer.
e SERVICE BULLETINS - Section to be used to hold Field Change Orders,
Upgrade Bulletins and Tech Tips.
Atari 1020 Color Printer vii
Field Service Manual
SECTION 1
THEORY OF OPERATION
OVERVIEW
The ATARI 1020 Color Printer is a free-standing, 40-column, 4-color printer that
averages 12 characters per second and provides graphics and ATASCI character
printout. It is a hard copy output peripheral intended for use under the control of the
ATARI 4001M, 800TM or 1200XLTM computer. It connects directly to the SIO
peripheral port of the computer (no interface is required). The printer mechanism is
an X-Y plotter which uses ballpoint pens as its writing instruments. All firmware is
resident in the printer and executed by an on-board microprocessor which controls the
functions of the printer.
Figure 1-1 is a block diagram of the functional flow of the 1020.
Atari 1020 Color Printer 1-1
Field Service Manual
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Atari 1020 Color Printer
Field Service Manual
1-2
USER INTERFACE
The Controls/Indicators are located on the front and back panels of the 1020. The
front panel contains the four manual (function) buttons and the LED which indicates
that power to the unit is ON (see Figure 1-2).
p A
Button A Top Cover
Power-On = E 0 И (0 7
LED yo Do ”
Change | i 7
Pen Button — + т Paper Feed Button
Change —
Color
Button
Figure 1-2. 1020 Color Printer Front View
From left to right the manual buttons and their functions are:
POWER - The microprocessor is reset when the POWER button is pressed.
PEN - This allows the pen to be changed. When this button is pressed, the
carriage moves to the right, then stops. The pen can be taken out by
operating the pen eject lever located at the right front of the unit.
COLOR - When this button is pressed, the rotary pen holder moves to the next
color position.
PAPER - Paper is fed when this button is pressed.
Atari 1020 Color Printer 1-3
Field Service Manual
The back panel contains two Input/Output (1/0) connectors and the Power Input Jack
(see Figure 1-3).
|
|| СОТОК СООО EM
= | =
Power Input Jack
Input Output Input Output
(VO) Connector (VO) Connector
Figure 1-3. 1020 Color Printer Back View
MECHANICAL
This section describes the mechanical characteristics of the 1020 Color Printer. For
an overall understanding of the 1020 printer operation, read both this section and the
Electronic section which follows it.
Case
The outer case is composed of four pieces of plastic. The pieces are 1) the upper case;
2) the lower case; 3) the front bezel; and , 4) the top cover.
Use Figure 1-4 and Figure 1-5 as reference for the following discussion.
Atari 1020 Color Printer 1-4
Field Service Manual
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Front Barai
Figure 1-4, 1020 Color Printer Final Assembly
Atari 1020 Color Printer 1-5
Field Service Manual
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Figure 1-5. 1020 Color Printer Mechanical Assembly.
1-6
Atari 1020 Color Printer
Field Service Manual
Frame
The frame has a side frame unit (right), side frame unit (left), mounting plate, and
paper guide. The lower edge of the frame, bent in the shape of the letter L, acts as a
mounting leg.
Print Head Mechanism
The Print Head mechanism consists of the Print Head motor, the idle gear, the bobbin
gear, the pulley support base (left), the pulley support base (right), the slider unit and
wire. The Print Head motor motion is transmitted to the bobbin gear via the idle gear
and to the slider unit by a wire. The wire tension is maintained by a coil spring.
Paper Feed Mechanism
The Paper Feed mechanism consists of the Paper Feed motor, the idle gear, the
platen, the paper holding roller (right) and the paper holding roller (left). The Paper
Feed motor motion is transmitted to the platen via the double idle gear.
Pen Up-Down Mechanism
The pen up-down mechanism consists of the electromagnet (solenoid) assembly
(actuator, actuator spring, coupling lever and permanent magnet), an ejection lever, a
roller lever, and four ballpoint pens. The up-down position of the pen is determined by
the direction of the electric current going through the electromagnet assembly.
Pen-up State (pen off paper/no write):
The condition when the actuator is open (and the pen is lifted from the paper) is
called the pen-up state. This state is held by the actuator spring over-riding the
pen down pressure of the ejection lever spring. The open position of the actuator
is limited by the stopper screw. |
Pen-down State (pen on paper/write);
A 5.4 msec impulse in the pen-down direction attracts the actuator, causing the
pen-down state. Under this state, the force of the permanent magnet is greater
than the actuator spring. This condition is maintained by the permanent magnet
after the power is cut. The pen pressure on the paper is maintained by the
ejection lever spring. During the pen-down state, there should be clearance
between the actuator and the coupling lever.
Color Change Mechanism
The color change mechanism consists of the Print Head drive mechanism, the rotary
pen holder, the slider unit, and the projection on the left side frame unit. The
operating principle is:
O The slider moves to carriage leit.
о By repeating the movement of the Print Head motor for 30 pulses to the
left, pen | changes to pen 2.
Atari 1020 Color Printer 1-7
Field Service Manual
Pen Ejection Mechanism
The pen ejection mechanism consists of the pen ejection lever mounted on the side
plate (right). The slider unit moves to the side plate (right) and stops. Pull the pen
ejection lever forward, and the pen ejects.
Netection Mechanism for Color Position and Home Position
A magnet is built into one part of the rotary pen holder. A reed switch is placed on
the left side of the frame unit. The switch is turned on when the pen holder repeats a
color change operation and the magnet comes close to detect the home position of the
color location.
ELECTRONIC
The 1020 Color Printer Electronics consists of 12 elements which are discussed in the
following paragraphs:
the Power Supply Circuit
the Noise Limit Capacitors
the Serial/Parallel Microprocessor (Al) Circuit
the Printer Controller Microprocessor (A2) Circuit
the Print Head and Paper Feed Motor Drive Circuit
the Pen Up-Down Solenoid Drive Circuit
the Color Detect Switch Circuit
the Paper Feed Switch Circuit
the Color Change Switch Circuït
the Pen Change Switch Circuit
the Power ON Reset Circuit
the Oscillator Circuits
NOTE: Electromagnet Assembly and solenoid refer to the same assembly.
Power Supoly Circuit
The unit is powered with an external AC Adaptor. The AC voltage is stepped down in
the adaptor. The voltage is internally rectified by a diode bridge (D1-D4), smoothed by
capacitors and regulated by voltage regulators (AS & A6) to obtain a stable power
output. The Power ON-OFF switch completes the AC circuit to the bridge rectifier.
The Power Supply provides the following voltages for use in the system:
Ve 5V+/- 5% for driving the motor and control circuits
Vp 5V+/- 5% for driving the pen up-down solenoid
Atari 1020 Color Printer 1-8
Field Service Manual
Figure 1-6 illustrates the Power Supply Circuit.
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Figure 1-6. Power Supply Circuit
Noise Limit Capacitors
In order to suppress induction noise to the power line, a luf film capacitor (C15) is
attached to the secondary AC circuit and 0.luf ceramic capacitors (C9, C10 & C11)
are used near the power terminal of IC's Al, A2 and A3. In addition, capacitors (C4 &
C5) are on each output leg of the Power Supply (C4 - Vc; C5 - Vp).
Serial/Parallel Microprocessor (Al) Circuit
Data communication with the computer is made via a 19,200 bps serial system. The
DATA OUT terminal is the output terminal from the computer which is, at the same
time, the input terminal for the printer unit. Similarly, the DATA IN terminal is the
output terminal from the printer unit. The COMMAND terminal is the output from
the computer, indicating that transmitted data are commands.
Data transmitted from the computer is converted to parallel data and transferred to
the Printer Controller microprocessor.
The serial/parallel converter uses an NMOS, 8-bit, one-chip microprocessor which
operates with a clock frequency of 4MHz controlled with an external quartz crystal
(X1).
Brief Description of Serial Port Signals:
3. DATA IN - 19,200 Baud data line to the computer (from printer)
4, GND = Ground (Digital Common)
5. DATA OUT - 19,200 Baud data line from the computer (to printer)
6. GND - Ground (Digital Common)
Atari 1020 Color Printer 1-9
Field Service Manual
7s COMMAND - Goes to zero when a command frame is being sent
10. +5V/READY - Indicates that the computer is turned on and ready.
Restricted use as a +5 volt supply.
Printer Controller Microprocessor (A2) Circuit
This is the heart of the unit which consists of an NMOS, 38-bit microprocessor. The
built-in ROM has a capacity of 4k bits and operates with a clock frequency of 4MHZ
with an external quartz crystal (X2).
The MPU receives data from the serial/parallel converter and decodes them to control
the Print Head Motor and the Paper Feed Motor and the pen up-down solenoid.
Print Head Motor and Paper Feed Motor Drive Circuit
Motor driver LB1257 (A3) is a monolithic digital integrated circuit which is
encapsulated in an l8-pin package. It is conductive to a phase where the
microprocessor terminal is "High". The Print Head and the Paper Feed motor are
stepping motors driven by 2-phase excitation. Basic clock of each motor is
approximately 4 msec which may be increased by approximately | msec when data is
input from the interface circuit during the motor operation. The motor power is
supplied from the same Vc (+5V) as the circuit drive.
Pen Up-Down Solenoid Drive Circuit
Up-Down of the ball point pen is controlled from CO and Cl terminals of the
microprocessor so that Pen UP or DOWN status is held thereafter by giving a single
pulse input of approximately 5.4 msec.
Up-Down action of the solenoid is determined by the current direction in the solenoid.
The Pen-Up current flows as (See Figure 1-7):
Vp —> Transistor Q6 —> Solenoid Pen Down Terminal (No. 13) — — >
Solenoid Pen Up Terminal (No. 12) — >» Transistor Q5 —>» Gnd
The Pen-Down current flows as (See Figure 1-8):
Vp —» Transistor Q7 —>» Solenoid Pen UP Terminal (No. 1 2) ———>
Solenoid Pen DOWN Terminal (No. 13) ——> Transistor Q4 —> Gnd
Transistor Q3 is to force transistor Q7 to be OFF when both CO and Cl terminals
output signals simultaneously for any cause. À surge voltage generated at the
solenoid ON/OFF is suppressed to approximately 16V by the bridge circuit which
consists of diodes D9 through D6 and a zener diode D7. The solenoid drive power
is supplied from Vp (5V).
Atari 1020 Color Printer 1-10
Field Service Manual
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Figure 1-8. Pen-Down Circuit
Atari 1020 Color Printer 1-11
Field Service Manual
Color Detect Switch Circuit
This switch detects the home position of the pen holder during a printer head color
change. The circuit is composed of a reed switch (on the side frame (left)) and a
magnet (in the pen holder). One end of the reed switch is connected to Ground and the
other to the microprocessor (A2, pin 1 2) and Vc via R6 (10K ohms).
The printer head carriage moves to the left. If the pen holder is at the home position,
the magnet attached to it causes the reed switch to make. As a result, +5V goes to
Ground, the microprocessor senses a low and detects the color change home position.
If the magnet is not at home position, the microprocessor senses a high and causes the
pen holder to continue rotating.
NOTE: The Paper Feed Switch, Color Change Switch and Pen Change Switch are
unworkable unless input data array ends with CR (Carriage Return) or LF (Line
Feed) code. When the printer stops under such a status, the switches are made
woriable by inputting CR code.
Paper Feed Switch Circuit
Paper is fed when this switch is pressed. When the Paper Feed switch and the Color
Change switch are pressed simultaneously, software reset works to set the printer to
the text mode and the carriage moves to the left end. One end of this switch is
connected to Ground and the other to the Serial/Parallel Converter microprocessor
(Al, Pin 15). When this switch is pressed, the switch makes, a low signal goes to the
Serial/Parallel converter microprocessor, causing the paper feed action.
Color Change Switch Circuit
When this switch is pressed, pen color is changed to the next color position. One end
of this switch is connected to Ground and other to the Serial/Parallel microprocessor
(Al, Pin 14). When this switch is pressed, the switch makes, a low signal goes to the
microprocessor (Al), causing the pen holder to rotate to the next color position.
Pen Change Switch Circuit
This switch allows the pen to be changed. One end of this switch is connected to
Ground and the other to the Serial/Parallel Converter microprocessor (Al, Pin 16).
When this switch is pressed, the switch makes, a low signal goes to the Serial/Parallel
microprocessor (Al, pin 16), causing the carriage to move to the right end and stop.
The pen can be removed by pulling forward on the pen eject lever. Return to normal
operation by pressing the paper feed switch. If the COLOR switch is pressed, pen
change action occurs again after color change action.
Power ON Reset Circuit
When the printer power switch is turned on, the microprocessor is reset internally by
the function of C13 (A2) and Cl4 (Al) to Ground. |
Oscillator Circuits
The Serial/Parallel microprocessor (Al) and the Printer Controller microprocessor (A2)
each incorporates a quartz oscillator (X!1 & X2) which determines the operation
frequency (4MHZz +/- 700 Hz).
Atari 1020 Color Printer 1-12
Field Service Manual
SECTION 2
SILKSCREENS AND SCHEMATICS
Attached to the front cover are representative silkscreens and schematics for the
1020. Remove them and place them in this section. Minor variations in design may
be encountered depending on the production date of the unit, but these schematics
provide all details required for an in-depth understanding of all 1020 Color Printer
units.
Atari 1020 Color Printer 2-1
Field Service Manual
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Figure 2-1. 1020 Color Printer Silkscreen.
Page 2-3
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Figure 2-2. 1020 Color Printer Schematic
"age 2-5
SECTION 3
TESTING
Equipment Required
e An Atari Computer and accessories
e A BASIC language cartridge
e CPS Diagnostic Diskette with the file T1020. BAS (FD100577)
e A Jewelers screwdriver kit
e A Standard tool kit
e A Volt/Ohmmeter
"® A 15 MHz oscilloscope
Diagnostic Procedure
The testing procedures available for the 1020 are:
e An Internal Test which occurs at Initial Power-Up
e CPS Diagnostic Diskette with the file T1020.BAS
e An Operator Test which consists of a BASIC Program which you will type in.
This test should be used only if CPS Diagnostic Diskette with the file
T1020.BAS is not available.
The following pages explain how to set up the 1020 for testing and contain
procedures and sample printouts for each test.
Setting up the 1020 for testing and using CPS Diagnostic Diskette with the file
T1020.BAS
l. Connect the computer to the TV set as shown in the computer owner's manual.
2. Plug the 1020 into the power adaptor.
3. Plug an I/O cable into the computer and the 1020.
4. Connect the disk drive to the computer as shown in the owner's manual.
5. Power up the 1020 Printer. The Internal Test occurs when power is supplied to
the 1020.
6. Power up the disk drive. Wait for the disk drive to complete its initialization.
7. Insert the CPS Diagnostic Diskette with the file T1020.BAS into the disk drive
and close the door.
8. Insert the BASIC cartridge into the computer (if applicable). *
*NOTE: This program requires the use of BASIC to execute, later model
computers may have BASIC already installed.
Atari 1020 Color Printer 3-1
Field Service Manual
9. Power up the computer. Wait for the computer to complete its initialization.
Display device should exhibit "READY" in white letters on a blue background.
10. Enter the command RUN "D1:T1020.BAS" and terminate with the RETURN
key.
ll. The program will now load and execute.
12. The following menu appears:
Test Facility
for the
1020 Plotter/Printer
Rev |
1) All Function Test
2) Pen Up/Down
3) Platen Up/Down
4) Draw Right/Left
5) Pen Change
Q) Stop test and return to menu
Please Select an Option
Select 1) for the printout illustrated in Figure 3-1 and Figure 3-2.
Select 2) to provide a signal for Pen Up/Down troubleshooting. The printout
for this option is a straight line drawn across the page.
Select 3) for Platen Up-Down operation.
The following menu appears:
Selection Test
Options for The
1020 Plotter/Printer
1) Platen Up
2) Platen Down
3) Return to Exec Menu
Q) Stop test and return to menu.
Please Select an Option
NOTE:Platen-Up spins the paper roll forward; Platen-Down reverses the paper roll.
Platen-Up pulls the paper in when paper is loaded. To avoid paper waste,
execute Platen-Down or remove paper when executing Platen-Up.
Atari 1020 Color Printer 3-2
Field Service Manual
Select 4) to move the carriage right and left.
NOTE: The carriage should go to the right, then to the left. It may stop at this
point. You may have to restart this test in order to continue.
Select 5) to rotate the rotary pen holder.
The following menu appears:
1) Change in increments of 1
2) Change in increments of 2
3) Change in increments of 3
4) Return to Exec Menu
Q) Stop Test and Return to Menu
Please Select an Option
NOTE: Option 3 rotates the pen holder in the following sequence: holder rotates
3 increments, then rotates | increment (to return to Home Position). This
is normal operation for this option and not a problem in your printer.
Atari 1020 Color Printer 3-3
Field Service Manual
Figure 3-1 is a black and white representation of the Diagnostic Diskette printout.
x TEXT MODE
FULL CHARACTER SET IN 29-CHAR MODE
ELNÉSOCiILIÍIUAQCUÓCU
EeédaATLe> Y
)X+,-./0123450/65 : ;
=> 7CABCDEFGHIJKLMNOP
QORSTUULIXYZLN IN Iabed
е ТОП ТОК Imoparstuvuwx
ТА | “ЯР
FULL CHARACTER SET IN 40-CHAR MODE
ELMNÉTOOLLTUEGUSAUAL LeeheddaATLeE> 2"HS78S?C
IK+,-.70123456739: ; (=>? GABCDEF GHIJKLMNOP
GRSTUUUXYZENIA_tabede fohijk Imnoparstuvux
YZAIN4p
FULL CHARACTER SET IN 80-CHAR MCOE
SABA 4 1 TTUYEALICAAL HANA ALP Ie Y RALIE? C IE, =-, 01245679: 1 a IMMMECTEF EC KLIOP
RS TU TEEN IS aDada yt Ja Lemoa! lu Ñ soy: 14
Figure 3-1. CPS Diagnostic Diskette sample printout (Text mode)
Atari 1020 Color Printer 34
Field Service Manual >
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bO‘CO‘I£‘B 371095
ay Ee Uk eee Smee Sew fee
J ae EE щен | ные
nn w— EE me Smee Amen Sn me NOT
ож A Rees
ep ок mm я We we AA AL O Мел MER A та ee
a mm р одна ser WE ui der wel GF A lm A UE AHR WR mh de Red A =
(1 01 8 3dAl INIT
ION IIHdJYY9 *
Figure 3-2. CPS Diagnostic Diskette sample printout (graphic mode)
3-5
Atari 1020 Color Printer
Field Service Manual
Internal Test
1) Press the POWER switch on the 1020. The switch should stay down and the
LED should come on.
2) The print head should move to the far left, stop there for 2-3 seconds then
draw four colored boxes on the screen (see Figure 3-3).
3) The print head should then stop near the left margin.
Figure 3-3 is a black and white representation of the Internal Test printout.
oad
Figure 3-3. Internal Test Sample Printout
Operator Test
NOTE: Use only if CPS Diagnostic Diskette with the file T1020.BAS' is not
available,
The 1020 has several different command codes. During this test we will test the
major character types. If the customer complains of other character types not
working, check page 3-10.
NOTE: It is possible you may enter the wrong command. Before
Troubleshooting, be sure that you made the correct entries.
To test the 1020:
|. Type in the following program in BASIC, making sure that you press the
RETURN key after each line that you type in. If you receive an ERROR
message after pressing RETURN, retype the line making sure that it is
typed exactly like the model at the top of page 3-7.
Atari 1020 Color Printer 3-6
Field Service Manual
2.
3.
10 OPEN #1,8,0,"P"
20 DIM AS(3)
30 ? #1:7#1
40 INPUT AS
50 IF AS="SKIP" THEN GOTO 30
60 ? HAS
70 FOR X=0 TO 126
80 IF X=27 THEN 100
90 ? #1;CHRS(X);
100 NEXT X
110 ? #1;CHRS(127)
120 GOTO 40
Type RUN and press RETURN.
A question mark will appear on the screen asking you for the command code.
When the computer is ready to accept a command the white cursor appears
to the right of the question mark. When the instructions tell you to type in
a certain code, refer to the Character Command Code Table (Table 3-1) on
page 3-9.
The above program checks text mode. For Pen Up-Down Troubleshooting,
Print Head (Carriage) Motor Troubleshooting or Paper-Feed (Platen) Motor
Troubleshooting, use the following instructions. |
Pen Up-Down Troubleshooting Program
Use above program with (See Table 3-1): 80 Columns per line
Enable International character set
This provides rapid pen up/down movement.
To repeat test, press RETURN.
Print Head (Carriage) Motor Troubleshooting Program
Enter the following. Remember to press RETURN at the end of each line.
10 OPEN #1,8,0,"P"
20 ?#1;" ESCAPE, ESCAPE, CONTROL G"*
30 2#1;"M480,0;0,0
40 GOTO 30
Type RUN and press RETURN.
To stop program, press (BREAK)
*Press the CONTROL key and the letter key at the same time.
Atari 1020 Color Printer 3.7
Field Service Manual
Paper Feed (Platen) Motor Troubleshooting Program
Enter the following. Remember to press RETURN at the end of each line.
19 OPEN #1,8,0,"P"
20 2#1;" ESCAPE, ESCAPE, CONTROL G"*
30 ?#1;"M0,999;0,-999
40 GOTO 30
Type RUN and press RETURN.
To stop program, press E REAK)
*Press the CONTROL key and the letter key at the same time.
Atari 1020 Color Printer 3-8
Field Service Manual
TABLE 3-1
CHARACTER COMMAND CODE TABLE
TEXT MODE:
YOU TYPE IN FUNCTION
ESCAPE, ESCAPE, CONTROL P + 20 column printing
ESCAPE, ESCAPE, CONTROL 5 * 80 column printing
ESCAPE, ESCAPE, CONTROL N * 40 column printing (normal)
ESCAPE, ESCAPE, CONTROL W * Enable International Char. Set.
ESCAPE, ESCAPE, CONTROL X + Disable International Char. Set.
GRAPHICS MODE:
YOU TYPE IN FUNCTION
ESCAPE, ESCAPE, CONTROL G* Enter Graphics Mode
?4F1 "A" Return to Text Mode.
? 4H "MX, Y" Move Cursor
*Press the CONTROL key and the letter key at the same time.
When entering the character command codes, do not insert spaces or commas
between the commands or press RETURN. Type them in consecutively on the
screen.
NOTE: The maximum number of characters that can be entered is eight.
Although you press the ESCAPE key twice, only one character appears on
the screen.
6. Press RETURN. The printer prints the default character set.
7. Press the COLOR button on the 1020.
8. Type in the code for (See Table 3-1): 20 columns per line
Enable International character set
and press RETURN.
9. Press the COLOR button on the 1020. The print head should advance a step.
10. Type in the code for (See Table 3-1): 80 columns per line
Disabie International character set
and press RETURN.
Atari 1020 Color Printer 3-9
Field Service Manual
LL:
12.
13.
Press the COLOR button on the 1020. The print head should advance one
step.
Type in the code for (See Table 3-1): 40 columns per line
and press RETURN.
Using the sample printout as a model (See Figure 3-4), examine the
characters to determine if they are the correct shape. If they are not the
correct shape, proceed to the Diagnostic Flowchart, page 4-2.
If the printout is correct, check for the following problem:
e Is the print lighter on one side of the lines than the other? If so,
replace either: 1) the pens |
2) the rotary pen holder.
Specific Command Code Failures
If the customer complains of a specific code failure (Example: won't draw in
graphics mode), verify the complaint, then check chips Al and A2. Swap these out
one by one using procedures on page 4-l.
Figure 3-4 is a black and white representation of the Operator Test printout.
ESTA CIK+,—-./0123456733: y <=> ?9ABCLEFG
“IJKLMNCPARSTULWXY2C NI _ abcde fgnijk (mno
2a7Tstuvwxyz |
AUECAS | E YUNNASRNAD?
Ne 0.0 1 a UD E a,
22n63l3A TDic> 2°'=98A?” (
нат, КИЗ И Ве аа,
=>? еВаСОВЕО- КС
(RS Tai YE iden BA pa BB GC
а тел ЕК LASS DO STE DUI
Y ZA 10
1 "QS! 7 ZP, -. 701734380709 : : (a) 2ФОВСТЕР АИ О NOPERS .ULAYIEN 1. 56de f9R ¡JE Lana
PAP taco |
I"ESZAUICIL=, -.79122455739: ¡ <=) 79ABCLE-G
RIJKLNCPERSTUUWXY2( sI” _ 2accdetgnijximng
DOTSLUVUXYZ |
Figure 3-4. Operator Test Sample Printout
Atari 1020 Color Printer 3-10
Field Service Manual
SECTION 4
DIAGNOSTIC FLOWCHARTS
OVERVIEW
The Diagnostic Flowchart is intended to be easy to use and the primary aid when
troubleshooting the 1020. Follow the prompts in the order presented. When a question
is asked, follow the line from the box that best applies to your unit's condition. When
that line terminates with a letter inside a circle, locate the letter on a different page
and continue the diagnosis. The flowchart leaves nothing to chance, it tells you when
to perform a specific test and when to replace components. Refer to Section 6,
Disassembly/Assembly for adjustments and replacements discussed in the flowcharts.
Refer to Section 3 for Tests which are referenced in the flowcharts.
SWAPOUT PROCEDURE
At many places in the diagnostic flowchart, a box tells you to "swapout" a component,
a chip, or a number of chips in a particular order. The "swapout" instruction means
that you should replace the indicated components (one at a time) with a known-good
component of the same type. The unit should then be tested with the new, known-good
component in place to see whether the swapout solved the problem being checked. If
the swapout did not fix the problem, leave in the new chip and swapout the next.
Repeat this procedure for the rest of the swapout. Once the unit properly functions,
reinstall the removed IC's to determine which are actually defective.
REPLACE IN ORDER
The "replace in order" instruction means that you should replace the.components
indicated in the order listed until the result called out in the previous block is
obtained.
A - Some lines terminate with an A inside a circle. When this occurs return to the
beginning of the Power-up sequence, Page 4-2.
If you need further clarification, call your Atari Repair Hotline.
Inside California
(800) 672-1466
Outside California
(800) 538-1535
Atari 1020 Color Printer 4-1
Field Service Manual
POWER-UP SEQUENCE
| Press the Power button. |
Return to beginning of
Power-Up Sequence
Replace the
Does the key stay down: [ Switch Assembly
Yes
| Does the LED come on?
Yes
| execute the original
| test nattern correctiv?
Yes
| Run the Test Program
(See Pg. 3-1).
—. Does the printer
execute the Test
Program correctly?
(See Pg. 3-4 de 3-5).
The printer is good.
See Pg. 3-10 for
further information.
Atari 1020 Color Printer 4-2
Field Service Manual
POWER-UP SEQUENCE (cont)
when they're not Pg. 4-7
supposed to write?
|“
Do the pens write
Are the pens good?
- Yes Yes Return to Beginning of
Р -
Does the paper move ower-Up Sequence
up and down? Pg. 4-3
Yes
Were the correct
colors displayed?
Does the print head
move left and right? Pg. 4-10
Yes
See Pg. 3-10 for
further information.
Atari 1020 Color Printer | 4-3
Field Service Manual
I
Is the power adap
good?
s there +5 VDC on pin
3 of A6?
| Is there 3-13 YDC an
; pin | of A6?
Is there 8-13 VDC on
| cathode of D3?
No
No
No
there 9 VAC on anode
of Du?
No
Defective
1) 33
2) C15
or open J3 to anode
of D4
NO POWER TROUBLESHOOTING
— Replace power adaptor. la
Return to Beginning of
Power-Up Sequence
(eee |
S Defective A6 or 1)
€ shorted C3/C7.
Open D3 cathode to
pin 1, Аб.
Defective
1) DI
2) D2 e]
3) D3
4) D4
| Repair or
Atari 1020 Color Printer
Field Service Manual
Replace
Return to Beginning of
Power-Up Sequence
4-4
PEN-DOWN TROUBLESHOOTING
|
Does pen up-down
mechanism operate
freely & smoothly
without binds when
actuator is manually
pulled free of perma-
nent magnet hold?
EG
Yes
Is 5.4 msec single pulse
available at J4-P12 to
with test program run-
ning? (See Note 1)
pull electromagnet free |
No
| output of AS regulator?
| Is there 5 VDC available ING
Yes
| Replace electromagnet
D7? | 1
/ Is there 5 VDC on J4-P7" No | assembly.
| Yes
Pg. 4-6
Note |: CPS Diagnostic
diskette with
file T1020.BAS
(Pen up-down).
If Diagnostic
diskette is not
available, see
Pg. 3-7
replace as
necessary
1) Electromagnet Assy
2) For .1 to .2 mm gap
between actuator &
coupling lever with
actuator attracted
and pen on paper.
3) For free operating
ejection lever shaft
with sufficient
tension by ejection
lever spring.
4) Any mechanical imped-
ance.
5) That actuator spring
over-rides ejection
Open between J pin 7
Repair
Return to Beginning of 7 =
Power-Up Sequence
Atari 1020 Color Printer
Field Service Manual
PEN-DOWN TROUBLESHOOTING (cont)
+
Replace A2 feed down now femmes
| 4] operate? |
Is a logic low pulse
available to trigger oe]
pen-down at IC A2, P10? Y
Are both XI & X2 at
4.43 MHz? Replace Al
Yes | | No ; Yes
Replace defective |
crystal
Check transistors
Qt, Ja, Q7. Compare
signals with Table 4-1.
Ace all transistors zo0od?
Yes
; Replace defective tran- |
| Replace PC Board |
Return to Beginning of
Power-Up Sequence
Table 81
Pen Up=-Doen Transistor Check
(All signals should be approx. 5 meee pulse Note that lead identification
while pen up-dcrem test is running) is as shown below,
UP DO YN VOLTAGE
TRANSISTOR from 19
A2 pin 9 $ A2pin la sv | ov
Qe Ql
E E connected to Ус
B 8 | Y fav
с c av | 3Y
93 qe
E E connected ww GND
В 8 av | IV
© c sv av
Je Q7
E E connected to Ур
a 8 Y 3 y
с с 3V | av
NOTE: Printer mechanism does not have to be connected to check for pulse.
Atari 1020 Color Printer 4-6
Field Service Manual
PEN-UP TROUBLESHOOTING
Ete gen cnc 1 EL
Does pen up-down
mechanism operate
freely and smoothly
when actuator is pulled
free of permanent
magnet hold manually?
Check: Adjust or
replace as
necessary
1) Electromagnet Assy
2) For .1 to .2 mm gap
No
between actuator &
Yes
coupling lever with
actuator attracted
and pen on paper.
3) For free operating
ejection lever shaft
with sufficient
tension by ejection
lever spring.
4) Any mechanical imped-
ance,
5) That actuator spring
over-rides ejection
lever spring.
115. 5.4 msec. single
[pulse available ar J4-P13
{to break permanent magne |
| Replace electromagnet
Yes
aa at output of AS regulator?
| assembly.
Is 5 VDC on 34-Р7?
Yes
| During running of Test
à Program, is logic low
| to trigger pen-up?
| Yes
Swapout
1) AZ
2) Al
| Check transistors
| 02, d
; Sebas with able 4-1,*
{Yes
| Replace PC Board.
6. Compare { 50 |
Transistors good? §
Replace defective
transistor.
=
*Page 4-6
Atari 1020 Color Printer
Field Service Manual
UN Return to Beginning of
| Power-Up Sequence
4-7
NO PAPER FEED TROUBLESHOOTING
Is there +5Ÿ on
pin 7 of J4?
running alone?
No
Ís paper feed motor
1
ils there approx. SV
Is uare wave at
A3 when the test is Da
É perating ee up-down?1
See Note |
[Is there approx. 4V p-
square wave at pins 2 32
foi AZ when the test is
Note 1)
-9 |
sins 15 18 |
; operating Platen up-down?
{(See
Yes
Defective A3 or open
Note |: CPS Diagnostic
diskette with
file T1020.BAS
(Platen up-down),
[f Diagnostic
diskette is not
available, see
Pg, 3-3
Atari 1020 Color Printer
Field Service Manual
Pg. Bal 1
"Detective mechanical
parts around paper
feed motor (right side
. mm — ето
feed motor
Return to Beginning of
Power-Up Sequence
NOTE:Platen-up pulls paper in when
paper is loaded. To avoid paper waste,
execute Platen-down or remove
paper when executing Platen-up.
4-3
PRINT HEAD DOES NOT MOVE
De
Vo
Is there +5
| of 347 Pg. 4-11
Yes
Is print head motor | parts around print head
running alone: motor (left side of print
Is there approx. 5V p-p
square wave at pins 11-14}
of A3 when the test pro- |
gram is operating Draw
right/left? (See Note 1)
| Мо
Is there approx. 4V р-р
square wave at pins 25-28
of A2 when the test pro- | NO
gram is operating Draw
| right/ left?
Yes
Defective A3 or open | !
on line \ itho u t 5 i gn al . r ons
Note 1: CPS Diagnostic
diskette with
file T1020.BAS
(Draw right/left),
If Diagnostic
diskette is not
available, see
Pg. 3-7
Return to beginning of
Power-Up Sequence
NOTE:Draw right/left moves the pen carriage right and left.
The pen may not be down, therefore no line will be drawn.
Atari 1020 Color Printer 4-9
Field Service Manual
COLOR CHANGE TROUBLESHOOTING
Does color change mecn-§ ng,
ansim operate properly [fr
rotating print head
motor manuallv?
{Yas
Coes print head motor
operate?
| Yes
Replace reed switch
assembly,
Replace as necessary:
1) Color Change Click
2) Rotary Pen Holder
3) Stopper Click
4) Print Head Motor
5) Replace Printer
Module or other
defective mechanical
Color Change parts
| Does it now operate? =>
is 5 YDC available at
R23 with reed switch open 7} —
Yes
Return to Beginning of
Power-Up Sequence
mel Check tracing on PC board
| 4 from output of regulator
| A6 to R23 and repair as
| necessary,
Is LED on?
Return to Beginning of
Power-Up Sequence
Atari 1020 Color Printer
Field Service Manual
4-10
NO UP OUTPUT
Open pin 7, J4 to
Is there +5 YDC on pin 3 [Yes |
[FP | pin3as.
Unplug J4. Is there ZA
Now +3 on pin 3 of A5? Ÿ |
No
Is there 9 VDC on pin 1 [Yesf Defective A5 or shorted [|
| Defective ||
of AS? or
No
| Open AS, pin | to AG,
Return to Beginning of
Power-Up Sequence
Atari 1020 Color Printer 4-11
Field Service Manual
Symptom
LED No Power
No Initialization
Pens Do Not Write
Pens Always Write
No Paper Feed
Print Head Does Not
Move
Atari 1020 Color Printer
Field Service Manual
SECTION 5
SYMPTOM CHECKLIST
Possible Cause
D10, A6, D1-D4, 33
Al, A2, A3, Motors, Pens
Pens, J4, Print Mech,
Al, A2, A3
J4, Print Mech, Al, A2, A3
Print Mech, Al, A2, A3
Print Mech, J4, Al, A2, A3
5-1
Flowchart Entry Point
С, Page 4-4
B, Page 4-3
E, Page 4-7
D, Page 4-5
F, Page 4-8
G, Page 4-9
SECTION 6
DISASSEMBL Y/ASSEMBLY °
Equipment Required
® a precision screwdriver set
e a solder iron
e pliers
e tweezers
e a small can of light weight oil
e Snap Ring Tool (optional)
e a feeler gauge
Preventive Maintenance
Each Atari 1020 Color Printer which is disassembled must have the following
Preventive Maintenance performed:
® Carefully clean any dust or dirt from inside the unit - use a dry, soft cloth.
e Use alcohol or benzene to remove any stains. Do not use thinner,
trichloroethylene or ketone solvents — they may damage the plastic parts.
e Lubricate each of the following points with one small drop of light weight
oil: Use Figure 6-1 as reference for these points.
- the pivot point of the ejector shaft (left front of printer module)
- the ejection roller (move the slider unit back and forth a few times to
distribute the oil evenly along the shaft)
Adjustments
Before returning the unit to the customer be certain that the following adjustments
are correct.
- Actuator and Coupling Lever Adjustment (See Page 6-5)
- Pen and Paper Platen Adjustment (See Page 6-6)
Atari 1020 Color Printer 6-1
Field Service Manual
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Figure 6-1. 1020 Color Printer Mechanical Assembly
6-2
Atari 1020 Color Printer
Field Service Manual
ee
ey Top
Switen Assornady
Senter Conrectse
РС Штат
|
Mourang Plate Tab
Figure 6-2. 1020 Color Printer Final Assembly.
6-3
Atari 1020 Color Printer
Field Service Manual
DISASSEMBLY
WARNING: Be sure unit is unplugged from AC power before disassembly to any level.
Use Figure 6-1 and Figure 6-2 as reference for 1020 Color Printer
Disassembly/Assembly.
Case Disassembly/Switch Assembly Removal
&
Slide the top cover back to disengage the tabs from the bezel. Lift off the
top cover and remove the paper roll.
Turn the printer upside down and remove the two front rubber feet (back
rubber feet are permanently glued in place).
Remove the two machine screws under the feet.
Remove the three wave screws.
Turn the unit right side up. Disconnect the upper case from the lower case
by slightly lifting the back portion of the upper case.
Pull the lower front portion of the bezel forward and disengage the hooks
on the upper side of the bezel from the upper case.
Set the bezel aside,
Set the upper case upside down in front of the lower case.
Remove the two screws which hold the switch assembly in place.
Remove the upper case.
To access the switch assembly harness, loosen the mounting plate screw
(right front) and swing the plate aside.
Printer Module Removal
Remove the screw (right front) which holds the mounting plate to the lower
case. Lift the mounting plate with printer module attached.
Remove the ground wire from the PC board (right front).
To remove the printer module from the mounting plate:
- remove the two front screws which hold the printer module to the
mounting plate.
- Loosen, but do not remove the two rear screws and brackets. Loosen
them enough to slide the rubber pads on the printer module out from
under the brackets.
Atari 1020 Color Printer 6-4
Field Service Manual
The following pages contain instructions for printer module component removal and
replacement. These includes:
the Electromagnet Assembly (Solenoid)
the Reed Switch
the Color Change Click
the Motor Cover, Print Head Motor and Paper Feed Motor
the Rotary Pen Holder
the Stopper Click
the Paper Feed Idle Gear
the Ejection Lever Spring
the Paper Holding Rollers
the Print Head Idle Gear
8 9086 05 0090802
Electromagnet Assembly (Solenoid) Removal and Replacement
NOTE: Do not use magnetic substance near the electromagnet assembly.
e Remove the Phillips-head screw which holds the electromagnet assembly
to the printer module frame (right front, under electromagnet assembly).
e Desolder the two electromagnet assembly wires from the PC Board. Note
where each is attached - you will need to recheck this during re-assembly.
To replace the electromagnet assembly:
® Insert the holding pin on the electromagnet assembly into the frame unit.
e Insert, but do not yet tighten the Phillips-head screw which holds the
electromagnet assembly to the frame. You will tighten it when you make
the actuator/coupling lever adjustment.
NOTE: The following adjustments must be made when the electromagnet assembly is
replaced.
Actuator and Coupling Lever Adjustment
- Place a pen in the rotary pen holder and pull the actuator of the
electromagnet assembly out to make the pen down condition.
- Adjust the gap between the actuator and coupling lever to 0.1-0.2
mm (See Figure 6-3),
- Tighten the screw which holds the electromagnetic assembly to the
frame unit.
Atari 1020 Color Printer 6-5
Field Service Manual
TOP VIEW
e Electromagnet Assembly
ACTUATOR
COUPLING LEVER
Figure 6-3. Actuator/Coupling Lever Adjustment
Pen and Paper Platen Adjustment
- Pull the actuator to make the pen up condition.
- Adjust the gap between the ball-point pen and paper platen by turning
the stopper screw (see Figure 6-4), The gap should be within the -
range of 0.6-0.7 mm. (For reference: turning the screw counter-
clockwise widens the gap.)
e Solder the two electromagnet assembly wires (one black; one red) to the
PC board. Be sure that each wire is attached to the correct point on the
PC board.
pm Electromagnet Assembly
STOPPER SCREW
Figure 6-4. Pen and Paper Platen Adjustment
Atari 1020 Color Printer 6-6
Field Service Manual
Reed Switch Removal and Replacement
Remove the Phillips-head screw and dust shield.
Desolder the two wires (one yellow; one grey) from the PC board.
To replace the Reed Switch:
Align the hole in the Reed Switch over the holding pin on the frame unit.
Insert and tighten the Phillips-head screw which holds the switch to the
frame unit.
Solder the two wires (one yellow; one grey) on the PC board.
Color Change Click Removal and Replacement
Before starting to disassemble, note the threading of the wiring hamess. You will
need to recheck that it is threaded correctly during reassembly. CAUTION: Be sure
that the wiring harness is not rubbing on the cable or pinched underneath the printer
mechanism.
Carefully insert a flat blade screwdriver between the frame unit and the
Pulley Support Base (Left) unit. Exert pressure to push the Pulley Support
Base unit away from the frame unit and slide the mounting tab out of the
frame unit hole.
Be sure that the wire does not unwind from the pulley.
Carefully slide the Pulley Support Base unit to the left and back to expose
the screw holding the Color Change Click to the frame.
Loosen the screw and remove the color change click. Be careful, the slider
shaft (B) can slide out easily at this point.
To replace the Color Change Clicks
O Align the hole in the Color Change Click over the holding pin in the frame
unit.
O Insert and tighten the Phillips-head screw which holds the Color Change
Click to the frame.
o Reposition the Pulley Support Base over the screw on the outside of the
frame. Align the base with the frame unit (mounting tab over the hole in
frame; pulley in frame unit opening). Move the bobbin gear to get more
slack if the wire is too tight.
o Gently push (with needle nose pliers, if necessary) the Pulley Support Base
Into position. Be sure that the horizontal and vertical planes are level.
о Check that the slider shaft (B) cannot slide out of the holes in the frame
unit.
Atari 1020 Color Printer 6-7
Field Service Manual
Check that the wiring harness is threaded correctly (not rubbing against
the wire or pinched under printer module).
Motor Cover, Print Head Motor and Paper Feed Motor Removal and Replacement
Insert a flat blade screwdriver between the motor cover and frame unit
(see Figure 6-5). Gently push the cover up and slightly forward to remove
Its
e Motor Cover
| 3 <— Frame Unit
Figure 6-5. Motor Cover Removal
Be sure to note the threading of the motor wiring harness. You will need to recheck
that it is threaded correctly during reassembly. Be sure that the motor wiring hamess
is not rubbing on the cable or pinched underneath the printer mechanism.
NOTE:
Removal procedure is identical for either motor (first five steps below). Step
six below identifies the wires to de-solder for each motor.
To access the screw holding the motor to the frame, disconnect the spring
attached to the Paper Holding Roller Support Plate from the frame. Remove
the Phillips-head screw which holds the motor to the frame.
Insert a flat blade screwdriver under the motor, between the frame unit and
motor. Gently pry with enough pressure to disengage the motor. Be careful
not to-bend the frame unit.
Desolder the jumper wire between the PC board attached to each motor.
Remove the screw which attaches the PC board to the frame unit.
Unthread the wiring harness from the frame unit and remove the motor.
If you are removing the Print Head motor, desolder the two reed switch wires
(one yellows; one grey) from the PCB. Note where each is attached - you will
need to re-check this during re-assembly.
If you are removing the Paper Feed motor, desolder the two electromagnet
assembly wires (one black; one red) from the PCB. Note where each is
attached - you will need to recheck this during re-assembly.
To replace the Print Head and the Paper Feed Motors and the Motor Cover:
Insert the gear and the motor shaft through the hole in the frame unit
(behind the Roller Support Plate Spring).
e Rotate the motor body so that the flange is even with the hole in the frame
unit.
Atari 1020 Color Printer 6-8
Field Service Manual
® Align the motor bushing with the hole in the frame unit.
® Check that the gears are engaged correctly.
® Insert and tighten the screw which holds the motor to the frame.
e Reconnect the spring from the Paper Holding Roller Support Plate to the
frame unit.
e Insert and tighten the screw which holds the PC board to the frame unit.
e Solder the jumper wire in place between the Print Head motor PC board
and the Paper Feed motor PC board.
e If you are replacing the Print Head motor, solder the two wires (one
yellow; one grey) connected to the Reed Switch.
If you are replacing the Paper Feed motor, solder the two wires (one red;
one black) connected to the electromagnet unit.
e Check that the motor wiring harness is threaded correctly.
e Replace the motor cover. Tab at right front of cover fits over side frame,
in front of screw which holds Paper Feed Motor. Then back of cover slides
inside frame unit (Refer to Figure 6-5). я
Rotary Pen Holder Removal and Replacement
e Be sure the rotary pen holder is empty when you remove it.
® Push the rotary pen holder slightly toward the platen to remove it. Lift
the pen holder out (front end first). Be sure the pen holder is empty when
you remove it.
To replace the Rotary Pen Holder
e Insert the tip of the rotary pen holder through the hole in the pen-return
spring on the slider unit.
e Push the rotary pen holder slightly toward the platen. This allows the hole
in the front (opposite platen) portion of the holder to fit over the tab in the
slider unit.
Stopper Click Removal and Replacement
e Slide the rotary pen holder to carriage left.
e Remove the Phillips-head screw which holds the stopper click to the slider
unit.
To replace the Stopper Click:
e Slide the rotary pen holder to carriage left.
Atari 1020 Color Printer 6-9
Field Service Manual
® Align the hole in the stopper click with the holding tab on the slider unit.
® Insert and tighten the screw which holds the stopper click to the slider
unit.
Paper Feed [dle Gear Removal and Replacement
® Remove the 1.5 E-ring from the idle gear.
e Slide the idle gear off the shaft.
To replace the idle gear:
e Slide the new gear onto shaft. Be sure that teeth mesh properly with
adjacent gears.
e Clamp the 1.5 E-ring in place over the end of the shaft.
Ejection Lever Spring Removal and Replacement
e Move the slider unit to the center of the carriage.
e Remove the Phillips-head screw which holds the electromagnet assembly to
the printer module frame (right front, under electromagnet assembly).
o Be sure to note how one leg of the spring fits over the frame and the other
leg fits over the ejection lever shaft.
e Remove the 1.5 E-ring from the end of the ejection lever shaft.
e Slide the shaft to the right to allow access to the spring.
e Remove and replace the spring. Be sure that the legs of the new spring are
placed properly over the frame and the ejection lever shaft.
© Place the ejection lever shaft through the hole in the left frame and
replace the 1.5 E-ring.
® Replace the electromagnet assembly (See Page 6-5).
CAUTION: BE SURE TO MAKE THE FOLLOWING ADJUSTMENTS WHEN
REPLACING THE ELECTROMAGNET ASSEMBLY:
- ACTUATOR AND COUPLING LEVER ADJUSTMENT (SEE PAGE 6-5).
- PEN AND PAPER PLATEN ADJUSTMENT (SEE PAGE 6-6).
Paper Holding Roller (Upper) Removal and Replacement
® Move the slider unit away from the side where you are working.
Atari 1020 Color Printer 6-10
Field Service Manual
Note that the right paper holding roller has a groove in it and the left
roller is smooth.
CAUTION: BE CAREFUL NOT TO DAMAGE THE WIRE OR GEARS
WHEN REPLACING THE ROLLERS.
e Disconnect the spring attached to the paper holding roller support plate
from the frame. This allows easier access to the rollers.
e Remove and replace the roller.
e Reconnect the spring from the paper holding roller support plate to the
frame.
Print Head Idle Gear Removal and Replacement
You will need to move the Bobbin gear aside in order to access the gear near the print
head motor. Do not remove the Bobbin gear. Be careful not to cross or unwind the
Bobbin gear wire.
9 Remove the 1.5 E-ring from the Bobbin gear.
® Move the Bobbin gear far enough out of the way to allow access to the
Print Head Idle gear. ;
e Remove the 1.5 E-ring from the gear.
e Slide the gear off the shaft.
To replace the Print Head Idle Gear:
e Slide the new gear onto the shaft. Be sure that the teeth mesh properly
with adjacent gears.
e Clamp the 1.5 E-ring in place over the end of the shaft.
e Place the Bobbin gear over the shaft. Be sure the gear meshes correctly
with adjacent gears.
® Clamp the 1.5 E-ring over the shaft.
PC Board Removal
e Remove the four screws which hold the PC board to the lower case.
8 Disconnect the Ground wire from the PC board.
e Disconnect the switch assembly wiring harness.
Atari 1020 Color Printer 6-11
Field Service Manual |
ASSEMBLY
PC Board Replacement
0
Align the four screw holes on the PC board with the holes in the lower
case. Check that the power jack and the [/O connectors are properly
aligned with the cut-outs in the lower case back.
Insert and tighten the four screws.
Replace the switch assembly wiring harness (35).
Printer Module Replacement
To replace the printer module on the mounting plate:
®
Switch
- Slide the rubber pads on the printer module against the two tabs on
the mounting plate, Place the brackets over the rubber pads and
tighten the Phillips-head screws.
- Insert and tighten the two front screws which hold the printer module
to the mounting plate.
Connect the wiring harness to the PC board (J4).
Align the mounting plate holes with the support post holes (the rear posts
have holding tabs).
Insert and tighten the screw which holds the Ground wire in place (right
front support post).
Connect the Ground wire to the Ground wire terminal on the PC board.
Assembly Replacement/Case Assembly
Place the upper case upside down on the table (front of case toward front
e
of unit).
e Position the switch assembly upside down over the two screw holes at the
front of the upper case. (Key extensions should be toward the front of the
case.)
® Insert and tighten the two screws which hold the switch assembly to the
upper case.
e Fit the upper case over the lower case.
e Slide the bezel tabs under the upper case and lock in place by pushing the
bottom of bezel against the lower case.
e Turn the unit upside down.
e Insert and tighten the three wave screws.
Atari 1020 Color Printer 6-12
Field Service Manual
e Insert and tighten the two machine screws.
e Insert the two front rubber feet over the machine screws.
e Turn the unit right side up and replace the paper roll.
® Insert the top cover (insert back first):
- Fit the top cover tabs into the upper case (holes at back).
- Slide the front tabs into place.
Atari 1020 Color Printer 6-13
Field Service Manual
00 Y av La 4 WN =
I
=
LOCATION
PCB Unit
Al
IS1
A2
IS2
A3
Au
A5, A6
Q1,2,3
Q4,3
Q6,7
Q8,9
Dl1,2,3,
D5,6,3,
D7
DIO
XxXl,2
Si
4
9
Printer Unit
Atari 1020 Color Printer
Field Service Manual
SECTION 7
PARTS LIST
DESCRIPTION
Printed Circuit Board, Loaded, Atari Spec
6805P ROM Version
IC Socket (23P)
6805V ROM Version
IC Socket (40P)
LB1257 Octal Power Driver
Two Input AND gate O.C HD74LS09
Voltage Regulator +5V HA17805P
PNP Transistor 2SAS44(C) or (D)
NPN Transistor 2SD788(C) or (D)
PNP Transistor 2SB739(C) or (D)
NPN Transistor 2SC945 Q, Por K
Diode, Rectifer VO3C 1.3A
Diode, Signal 1S2076F A 250MW
Diode, Zener HZ11 AFAVZ=9.9V
LED SLP-136C-50
Crystal PX-1 4 MHz
Switch Module SUF-43
Connector, Switch
Connector, Printer
Ballpoint Pen (std. Pack)
Roll Paper (Atari Spec)
Roll Paper Shaft
Bezel Unit
Cover Unit
Rubber Foot (Front)
Mechanical Module
Print Head Motor Unit (Carriage)
Paper Feed Motor Unit (Platen)
Paper Feed Idle Gear
Paper Holding Roller (Upper Left)
Paper Holding Roller (Upper Right)
Electromagnet Assy (Solenoid)
Rotary Pen Holder Set
Stopper Click
Reed Switch Unit
Color Change Click .
Ejection Lever Spring
Type E Stopper Ring 1.5
Type E Stopper Ring 2.0
Type E Stopper Ring 1.2
PART NO.
СА060459
FC100346
C014336-08
FC100347
СО14386-09
FC100348
FC100632
FC100350
FC100351
FC100352
ЕС100353
FC100354
FC100355
FC100356
FC100358
C014776
FC100357
FC100359
FC100360
FC100361
C061420-01
C061533
FC100365
FC100366
FC100367
FC100369
FC100385
FC100370
FC100371
FC100372
FC100373
FC100374
FC100375
FC100376
FC100377
FC100373
FC100379
FC100380
FC100331
FC100382
FC100383
SECTION 8
SERVICE BULLETINS
This section is to be used by you to file the three classifications of service bulletins that
are periodically released by the Director of Technical Support.
The following are brief descriptions of each classifications
FIELD CHANGE ORDER
A Field Change Order describes mandatory hardware or software changes to ATARI
products and instructs how to implement these changes. The changes must be performed
on all units serviced or repaired.
UPGRADE BULLETIN
An Upgrade Bulletin describes product improvements or modifications that the consumer
may wish to purchase. These bulletins allow you to modify the customer's unit to add
capabilities which may not have been available when the unit was originally
manufactured.
TECH TIP
A Tech Tip is a document of a general nature which transmits routine service or repair
information. By communicating methods developed since you attended training classes,
Tech Tips aid to continuously improve repair skills and increase knowledge of ATARI
products.
Other times, Tech Tips alert you to units that have been modified and are now standard
for ATARI Manufacturing, but are different from many existing units and require
different repair techniques.
Atari 1020 Color Printer 8-1
Field Service Manual
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