133002-00_Televideo_9320_Video_Display_Terminal_Maintenance_Manual_Aug88.pdf

TELEVIDEO®

9320 VIDEO DISPLAY TERMINAL

MAINTENANCE MANUAL

Document 133002-00

August 1988

Copyright

Copyright © by Tele Video Systems, Inc. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior written permission of Tele Video Systems, Inc., 1170 Morse Avenue, P.O.

Box 3568, Sunnyvale, California 94088-3568.

Disclaimer

Tele Video Systems, Inc. makes no representations or warranties with respect to this manual. Further,

Tele Video Systems, Inc. reserves the right to make changes in the specifications of the product described within this manual at any time without notice and without obligation of Tele Video Systems, Inc. to notify any person of such revision or changes.

Tele Video is a registered trademark of Tele Video Systems, Inc.

TeleVideo Systems, Inc., 1170 Morse Avenue, P.O. Box 3568, Sunnyvale, California 94088-3568

408/745-7760

Contents

1 Introduction

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

2 Theory of Operation

DETAILED DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

System Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

CPU System And Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Character Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Video Display Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Screen Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

3

Maintenance

VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Terminal and Keyboard Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Terminal and Keyboard Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

TESTS AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Height and Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Trapezoidal Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Concave and Convex Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Display Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2 iii

Making Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

REMOVING THE MODULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Opening the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Removing the Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

Replacing the Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

Closing the Terminal Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

Opening the Keyboard Case and Removing the Keyboard Circuit . . . . . . . . . . . . .3-8

Replacing the Keyboard Circuit and Closing the Keyboard Case . . . . . . . . . . . . .3-8

4 Parts and Service

ORDERING SPARE PARTS . . . . . . . . ; . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

SERVICE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Return Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Regional Sales Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

5 Schematics

A

Service Bulletins

Illustrations

1-1 Front View of the 9320 ..

1-2 Rear View of the 9320 . . . . . .

1-3 Keyboard Layout . . . . . . .

2-1 Block Diagram of the 9320 .

2-2 Memory Map for the 9320 .

3-1 Discharging Voltages . . . .

3-2 Opening the Terminal Case .

3-3 Removing the Circuit Board

Tables

1-1 Main Port Assignments for DB-25 . . . .

1-2 Main Port Assignments for DECconnect

1-3 Printer Port Assignments for DB-25 . . . .

1-4 Printer Port Assignments for DECconnect

3-1 Troubleshooting Guide .

4-1 Main Parts List .. . . . . . . . . . . . . . . .

4-2 Parts Reference List . . . . . . . . . . . . .

5-1 Circuit Board IC Reference (Logic Board)

· .1-1

· .1-2

.1-7

· .2-1

· .2-3

.3-5

.3-6

.3-7

.1-3

.1-3

.1-3

.4-1

.4-2

. .. 5-1 iv

1 Introduction

T his manual is intended only for qualified repair personnel. You will find specifications for the

9320 at the end of this Section and detailed circuit descriptions in Section 2.

Using the procedures in Section 3, the schematics in Section 5, and an Operator's Manual, you can repair most failures quickly.

If difficulty arises, contact your dealer.

If you fmd that you need parts or service, you will fmd the information you need in Section 4.

OVERVIEW

Tele Video's 9320 terminal is an ANSI terminal that emulates the DEC VT320 terminal. The

CPU for the 9320 is the 65C816 microprocessor.

The CRT controller is the 2672.

Figures 1-1 and 1-2 show front and rear views of the terminal.

Figure

1-1.

Front View of the 9320

9320 Maintenance Manual

1-1

Introduction

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POWER CABLE

SOCKET

-__ -----=::-,!!,.

AUX

~a~~~'-:-i-n~=~/:~4~

AUX/ PRINTER PORT

DEC CONNECT AUX/

PRINTER PORT

R5-232/RS.423 HOST PORT

DEC CONNECT HOST PORT

Figure

1-2.

Rear View of the 9320

DESCRIPTION OF THE

MODULES

The logic, video, and power supply circuitry are all on one board - the circuit board, which is inside the plastic case under the CRT.

Logic Circuitry

Video Circuitry

The video circuitry, which is also on the circuit board, takes care of horizontal and vertical sweep and video amplification. It produces a non-interlaced raster display on the screen. The video signals created by this circuitry generate a series of pixels to appear at pre-determined positions on each scan line. To display characters, the video circuitry forms dot matrices that are 10 pixels wide and either 10 or 14 pixels high (10 x 10 or 10 x 14 character cells).

The 65C816-based control circuitry on the circuit board generates the video and sync signals needed to display data on the CRT screen. It also processes and stores data to be transmitted or received.

Power Supply Circuitry

The main logic of the circuit board includes four areas, which are described in detail in Chapter 2

("Theory of Operation"):

• Main processor (CPU)

• Random access memory (RAM)

• Display processing

• Input/output interface

Introduction

1-2

The components of a switching power supply are distributed along the right side of the circuit board. The power supply converts input voltage of 90-130 Vac (60 Hz) or 180-260 Vac (50 Hz) to the following:


+

5 V dc for TTL logic on the circuit board

+

12 V dc for the video signals and RS-423 communications

-12 V dc for RS-423 communications

A user-replaceable fuse near the power plug protects the circuitry from excess current.

Keyboard

The 9320 has a detachable keyboard connected to the terminal by a coiled cable. This keyboard contains an array of keyswitches mounted on a printed circuit board (PCB) that includes an 8049 microcontroller and other components.

The 8049 scans the keyboard matrix, encodes the data, and transmits the appropriate scan codes.

Data is transmitted through a 4-wire cable over an asynchronous serial port at 9600 baud to the main logic board.

On the circuit board, the serial data is converted to parallel and decoded by the main processor using decoding firmware.

RS-423 SIGNAL

ASSIGNMENTS

Main Port Connectors

The 9320 has two RS-423 main port connectors: one DB 25-pin (labeled HOST) and one

DECconnect (labeled

~).

Table 1-1. Main Port Assignments for DB-25

Pin Signal Name Direction

1

2

3

4

5

Frame Ground

Transmit Data

Receive Data

Request to Send

Clear to Send nla

Output

Input

Output

Input

6

7

8

20

Data Set Ready

Signal Ground

Data Carrier Detect

Data Terminal Ready

Input n/a

Input

Output

Table 1-2. Main Port Assignments for

DECconnect

Pin Signal Name

Direction

1

2

3

4

5

6

Data Terminal Ready nla

Transmit Data

Output

Transmit Signal Ground Input

Receive Signal Ground Output

Receive Data Input

Data Set Ready Input

Printer Port Connectors

The 9320 has two RS-42J printer port connectors: one DB 25-pin (labeled AUX) and one

DECconnect (labeled

.!,).

Table 1-3. Printer Port (DCE) Pin Assignments


1

2

3

5

Frame Ground

Receive Data

Transmit Data

Clear to Send nla

Input

Output

Output

6

7

Data Set Ready

Signal Ground

Output nla

8 Data Carrier Detect Output

20 Data Terminal Ready

Input

Table 1-4. Printer Port Assignments for

DECconnect

1

2

3

4

5

6


Data Terminal Ready n/a

Transmit Data Output

Transmit Signal Ground Input

Receive Signal Ground Output

Receive Data

Data Set Ready

Input

Input


1-3 Introduction

SPECIFICATIONS

Physical

VDT Dimensions:

Height

Width

Depth

VDT Net Weight

Case Foot Print

Case Features:

Tilt

Swivel

Cooling

Connectors

CRT:

Diagonal Measure

Phosphor

Fluorescence

Bulb

Face-plate

Screen

Persistence

Introduction

13.6 inches (34.5 cm)

12.9 inches (32.8 cm)

13.9 inches (35.4 cm)

17.5lbs.

8.6 inches by 8.0 inches (max.)

-5 to

+

15 degrees

270

0 left to right

Convection system

One RS423 communication port (DB25 male and

RJll DECconnect)

One RS423 printer port (DB25 female and RJll

DECconnect)

One RJll keyboard port

One AC receptacle-type quick disconnect

13.7 inches (34.8 cm)

P134 (amber); P192 (paper white)

Amber; paper white

90

0 deflection, 60" radius face

Filterglass

Aluminized

Medium short (300us decay time)

1-4


Electrical

ACSupply:

Input Line Voltage

(Jumper Selectable)

Frequency

Source Current:

115VLine

230VLine

Phase

Wattage

DC Supply:

SV

12V

-12V

Ripple and Spike Noise

95Vto 130V

180Vto260V

50/60 Hertz

+ /-

3 Hz.

1.0 Amp max.

0.5 Amp max.

Single phase, 3-wire

40 VA max.

+/-

.2SVat 1.5 Amp

+ /-

.24V at 1.6 Amp

+ /-

.24V at 150mA

SOm V peak to peak

+

5V

100m V peak to peak

+

12V; -12V


1-5

Introduction

Display

Horizontal Scanning Frequency

Vertical Scanning Frequency

Character Lines

Columns Per Line

Cell Size (Character Block):

Width

Height

High Voltage (At Dark Screen)

High Voltage Regulation (From Dark

Screen to Full Bright)

Picture Brightness at Maximum Contrast

Adjustment Equal to or Greater Than

Picture Size (Active Display):

Format

Width

Height

Levels of Gray

80

26.46 Khz

70Hz, 80Hz

24,25

80

Dot Matrix

10

132

26.46 Khz

70Hz, 80Hz

24,25

132

Dot Matrix

10

14, 10 14,10

13.5 KV

+ /-

500V 13.5 KV

+ /-

500V

500V

+/-

250V

500V

+/-

250V

20 ft. Lambert 20 ft. Lambert

24, 25 lines

240mm

180mm

Dark, Half Bright,

FullBright

24, 25 lines

240mm

180mm

Dark, Half Bright,

Full Bright

Introduction

1-6


Keyboard

Style

Home Row DIN std.

Height

'Nidth

Depth

Net Weight

Microeontrol1er

Layout

Operating Life

Low profile

30 mm untilted

1.5 in (3.8 em)

--

..

---

'-

-_.r,m)

- - - /

7.1 in (18.0 em)

2.0 kg (4.5 lbs.)

8049

See Figure 1-3 below

100 million keystrokes min.

D

DARK COLOR KEYCAPS

D

LIGHT COLOR KEYCAPS

Figure

1-3.

Keyboard Layout

)


1-7

Introduction

Environmental

Operating:

Temperature

Humidity

Altitude

Non-operating:

Temperature

Humidity

Altitude

MTBF

MTTR

Vibration

Shock

Shipping:

Girth

Weight

5 to 40° C (41 to 104° F)

10 to 85% non-condensing

3,000 m (10,000 ft.)

-40 to 60° C (-40 to 140° F)

10 to 85%

5,000 m (15,000 ft.)

20,000 hours min.

15 minutes

0.3G, 5 to 100 Hz., operational

2OG, Ums, 18 shocks

108 inches max.

50 lbs. max.

Introduction

1-8


<

CRT Controller Format

80x26

26.9892 MHz

Dot Frequency

Character Cell:

Number of Dots per Character (Width) 10

Number of Scan Lines per Character (Height) 10,14

Character Frequency

2.6989 MHz

Screen Format:

Display Characters per Line

Total Characters per Line

Number of Rows per Screen

80

102

25

132x26

44.4528 MHz

10

10,14

4.4452 MHz

132

168

25

/


1-9

Introduction

PC Board

Main Features:

Type of board

Microprocessor

CRT Controller

Communication controller

Gate Array

Battery

Current Load:

Standard with Options

Memory

System ROM

System RAM (CMOS)

Display RAM

Character generator RAM

Communications:

Main Port

Printer Port

Parity

Data Bits

Handshaking

2-sided, includes power and ground

65C816 (5 MHz)

2672 (5 MHz)

2681 DUART

PIN 271049-00 (custom)

3V min. Lithium

1.2A (5V); 1.5A (12V); 100 rnA (-12V)

1.5A (5V) max.

64K (27512)

8Kbytes

16K x 2 (character and attribute)

8K bytes

RS423 (P3, P6) (75 - 19.2K bit/sec.)

RS423 (P4, P5) (75 - 19.2K bit/sec.)

No, Odd, Even, Mark, Space

7or8

No, X-on/X-off, DTR, both

Introduction

1-10


\

2 Theory of Operation

INTRODUCTION

T he 9320 logic is based on a 4.45-MHz 65C816 microprocessor, using a 24-bit address bus that allows access to 16 MBytes of memory. A considerable amount of the terminal's functionality has been incorporated into a gate array. Refer to the block diagram (Figure 2-1).

In this chapter, we'll discuss the following topics:

• System clocking

~ Gate array

• CPU system and control

• Character generation

• Video display generation

• Screen data storage

• Communications

~

65C816

HMI

HSYNC

VSYNC

BLANK

DISPLAY ADDRESS BUS

DATABUS

MUX

5157

Figure

2-1.

Block Diagram of the 9320


2-1

CHAR LATCH

CHAR

GEN

6264

BLANK

1

SCAN LINES

Theory of Operation

DETAILED DESCRIPTIONS

System Clocking

The 9320 displays lO x 14 character cells in either

SO-column or 132-colurnn mode, using a different dot clock for each display mode. Clock oscillator

Y2 at 44.4528 MHz serves as the basic. clock in

. 132-column mode. A crystal circuit (Y3), which oscillates at 26.9S92 MHz, serves as the basic clock in

SO-column mode. (Crystal Y1 serves as a baud rate clock for the communication ports.)

Selection of 80 or 132 column operation is done inside the gate array chip through software programming. The frequency at which the microprocessor operates depends on the mode of operation selected, 80 or 132 column. Oscillator

Y2 the dot clock in 132-column mode, serves as a clo~k to send video data through a shift register inside the gate array, and serves as a processor clock after it is divided by ten. Crystal oscillator

, in

80 column mode, provides the same two functions. character generator RAM, address decode for

EPROMs, screen RAM, I/O ports and other signals.

It provides a control signal to control. the direction of the character RAM transceiver.

The gate array loads fonts to the character gener" ator. Four of the scan address lines come from the gate array. The scan line counter that contr~ls double width, double height and smooth scrollIng is also inside.

In addition, the gate array handles keyboard transmit and receive data, attribute logic, and the video shift register.

The CPU communicates with the gate array using internal registers that are accessed by reading or writing specific locations inside the gate array.

One status register (read only) provides the CPU with the status of internal signals like transmit register empty, receiver full, keyboard overflow, and interrupt.

The Gate Array

The major functions of the gate array include basic timing functions, reading and writing attribute

RAM, timing for writing to various areas of memory, control for the character RAM transceiver, font-loading, various scan line functions, keyboard communication, and handling video attributes and the video shift registers.

Descriptions are given in the paragraphs that follow.

The CPU clock is stretched in 132 column mode when accessing the EPROM and CRT controller.

The system clock is also stretched when accessing

I/O ports in both modes. The CRT controller character clock is the inverted system clock. The baud rate clock generator circuit for the I/O ports is also generated inside the gate array.

The gate array controls attribute RAM data read/write operation. The gate array also provides a write pulse for screen RAM and

Theory of Operation 2-2

CPU System And Control

The CPU system consists of the following four subsystems (with identifiers from sheet 1 of the schematics in parentheses):

• the 65C816 CPU (U14)

• the system 27512 EPROM (U12)

• the 6264 system RAM (U13)

• the system reset controller (UlO)

The CPU is the controller for the entire board, initializing and controlling all of the DUART, the

CRT controller, the clock circuits and the gate array.

It also processes all of the data received from the keyboard, computer, or printer, and updates the video RAM accordingly.

The CPU address space is divided into 256 banks of 64 Kbytes. It always reads instructions from the

EPROM. Data is read from EPROM U12 as from bank 1 and EPROM U11 as from bank 3.

Many of the display features, such as smooth scrolling and line lock are controlled by the CPU in conjunction with the CRT controller and gate array.


Each device on the board has a specific address or range of addresses, as shown on the memory map (Figure 2-2). Bank 0 is divided into 8 kbyte blocks inside the gate array. The first 8 kbytes block is for the system RAM. The next blocks are reserved for the CRT controller, gate array and communication ports, respectively. The next two biocks of i6 kbytes are for ihe characteI' RAIvf aiid attribute RAM.

3FFFF

System ROM

30000

1FFFF

System ROM

10000

OFFFF

Attribute RAM

OCOOO

OBFFF

Character RAM

08000

07FFF

Communication

06000

05FFF

G/A, keyboard data, character generator

04000

03FFF

02000

01FFF

00000

CRT controller

System RAM

System RAM serves two purposes in the 9320.

Part of the RAM is used by the firmware as the stack and other temporary data, such as input and output buffers. In addition, the RAM is backed up by a battery, thus retaining the data even with power switched off. This allows portions of the

RAM to be used for function key programming

and to retain initia!ization parameters.

To retain data, two things must occur: 1) the voltage to the RAM must not fall below 2 volts; and,

2) the RAM must be deselected as power from the power supply discharges.

Voltage is maintained by the battery (BTl).

Deselecting the RAM is accomplished by using a transistor (02) in series with the chip select signal from the decoder, as described in the next paragraph.

System reset is controlled by the DS1231 power monitor (UlO). As it is configured, the DS1231 uses a comparator to monitor VCC and outputs the signals RST (pin 5) and RST (pin 6) when

VCC falls to 4.75 V. Upon power up, these signals are held active for at least 250 ms to allow the power supply to stabilize, and properly initialize the cpu.

With power on, SYSTEM RESET is high, turning

02 on and allowing the chip select signal to go to the RAM. When power goes away, the SYSTEM

RESET signal goes low when

+

5 volts falls below

4.4 volts. This turns 02 off, causing pin 20 of the

RAM to follow the voltage at the junction of CR 7 and R17. This voltage is reached (typically 2.8 to

3 volts), at which time the battery voltage takes over.

The CPU system uses the control latches inside the gate array to give the firmware control over some hardware devices that do not interface with the data bus. There are three of these registers

(two available to the user), which contain the following control bits:

Figure

2-2.

Memory Map for the 9320


2-3

Theory of Operation

Control Register 1:

7

80/

132

6

Dark!

Light

5 4 3 2

1

0

CharGen FontLoad DispRAM Reserved Reserved Reserved

256/512 On/Off A14

7.80 or 132 column mode

6. Dark or light background works on whole screen.

5. Most significant bit indicates the number of different characters in the character generator: 256 (oft) or 512 (on).

4. During font load, character font load at the beginning of power on routines, or user defined font load at any time, this bit should be turned on.

3. Controls highest order address of 32Kx8 static RAM, allowing for two 16K blocks of display memory.

2.1.0 Reserved for firmware control.

Control Register 3:

7 6 5 4

Control Control Reserved Blink

I II Clock

3 2

ENTxD Screen

IRQ

Mode

1 0

Speaker DTR

On/Off

7.6. Controls the baud rate up to 38.4 kbaud for communication ports. Used to control the transmit and receive clock to the computer and printer port UART.

5. Reserved for firmware control.

4. Blink on/off.

3. Enable transmit data IRQ.

2. Screen mode is used by video circuitry. This bit is used along with cell size selection (10 x 10 or 10 x

14) to maintain screen size. This is a latch output.

1. Speaker on/off.

o.

Data Terminal Ready. A signal sent to the host computer telling it to stop transmitting data to the

9320.

Theory of Operation

2-4


Character Generation

The 9320 uses character cells, rather than a full bit-mapped display, to produce characters on the screen. In 24-25 row mode, each character cell is

10 pixels wide by 14 pixels high. The screen displays either 3300 character cells in 132-column

mude (132

A

25), or 2000 character cells in

80-

column mode (80 x 25).

Each of the 512 possible characters is pre-defmed and resides in the character generator RAM

(U34). (During power-up, the character fonts are copied from EPROM to character generator

RAM.) The CPU changes the display by changing the code stored in the screen RAMS at the desired location(s).

The codes written into the screen RAM are read out as the CRT controller refreshes the display

(see "Video Display Generation" later in this chapter). As each code is read out, one per character clock cycle, it is latched into the character address latch (U35).

The outputs of the character address latch are used as the high order address lines of the character generator RAM. The low-order addresses are provided by the scan line counter inside the gate array. The 8-bit data from the character generator is transformed into lO-bit words inside the gate array.

In order to load the character generator RAM, the following circuits are provided inside the gate array. The scan line counter is loadable by the

CPU via the scan line offset register, which is accessed as one of the registers in the gate array. It is loaded with data present on DO-D3 outputs of the scan line offset register. During normal operation, this counter is clocked by BLANK.

During font load, it is clocked by accesses to the character generator data register.

During screen refresh, data is transferred from the scan line offset register to the scan line counter on the rising edge of BLANK from the CRTC.

During a font load operation, the transfer does not occur.

Under certain conditions, two of the shift register's inputs are connected to provide a character cell 10 pixels wide without using a speciallO-bit wide RAM. In normal text mode, D7 from the character generator is always a low

(zero), creating a single dot space on the left side of each character cell.

Video Display Generation

The video monitor requires three signals from the logic board to produce a display on the CRT:

• vertical sync (VSYNC)

• horizontal sync (HSYNC)

• video (VIDEO)

VSYNC and HSYNC originate from the CRT controller (U15). They are buffered and connect to the video section of the board. Video comes from the gate array (U26). It goes through a highcurrent open collector inverter (U20) , where

DEC and HI outputs are also tied.

HSYNC and VSYNC are timed pulses derived by the CRT controller from internal programmable counters that count CCLK cycles. For example,

HSYNC might be a positive-going pulse starting

83 CCLK cycles after the beginning of each scan line and lasting 18 CCLK cycles. The CRT controller's internal counter would reset at the beginning of each scan line, count to 83, set HSYNC high, count 18 more CCLKs and set HSYNC low.

VSYNC is a much slower signal based on scan lines. Another counter inside the CRT controller counts scari lines and toggles VSYNC according to the way the firmware has prpgrammed the internal registers.

As the SCN2672 CRT controller (U15) counts

CCLKs, it is also putting out addresses on its display address lines (pins 21-34, DAD DO-

DADD13). These lines connect to four 74LS157

4-bit, two-way multiplexers (U18, U22-U24). The select inputs of the multiplexers are normally high, allowing the CRT controller's address line to access the data in the screen RAMs.


2-5

Theory of Operation

As data in the screen RAMs is read out, it is latched into the character address latch (U35) for the character data bus and into the gate array for the attribute data bus.

The character generator data that goes into the gate array is shifted from parallel to serial data, and is combined with attribute data, the BLANK output of the CRT controller, the cursor output of the CRT controller, the screen background control (light/dark) and other signals to produce a series of pulses that comes out on the VIDEO output of the gate array.

If the VIDEO output is high, the electron beam in the CRT is turned on, producing a light dot or series of dots on the screen. If VIDEO is low, the screen is dark.

Screen Data Storage

If the CPU needs to access either the character

(U36) or attribute (U29) RAMs, the corresponding signal, CHAR RAM WR or ATT RAM WR goes low for half of a CPU cycle. Also, MUX DIR switches the multiplexers to the CPU's address bus.

Character data and attribute data normally go directly into the gate array. The CPU reads and writes character RAM through transceiver U32.

(Signals referred to as "SIGNAL" appear on the schematic as \SIGNAL.)

Communications

There are three serial communications channels.

Two channels have their own dedicated DUART; the third is inside the gate array. They can send and receive data at speeds ranging from 75 to

19,200 bits per second.

One channel of the DUART (U9) is used for communication to the host computer. It interfaces to a 25-pin D-subminiature connector (P3) and a

DECconnector (P6) via TTL to RS-423 level converters 75146 (U4) and MC3488 (U2).

The baud rate is selectable under firmware control and is derived from the crystal across pins 32 and 33 ofU9.

The other channel of U9 is dedicated to printer communications. It interfaces to a 25-pin D-subminiature connector (P4) and DECconnector

(P5) via a 75146 (U3) and a 3488 (U1).

Since the keyboard's data rate is 9600 baud, the gate array's serial channel operates only at this one rate.

The IRQ outputs for the DUART and the gate array are tied together in a wire-OR configuration. Wheneither device generates an interrupt request (IRQ), the IRQ line goes low, signaling to the CPU that an interrupt has occurred. The

CPU then polls the devices to determine which one generated the interrupt, and processes the interrupt as required.

Theory of Operation 2-6


3 Maintenance

VISUAL INSPECTION

A thorough visual inspection often makes the difference between success and failure in a repair attempt. Often a problem can be located just by close visual inspection. defective traces, and signs of overheating and burning. Check the telephone-style connectors.

Remove all defective modules for closer inspection and repair. When you finish the repairs, replace the module(s) and test them.

Terminal and Keyboard Exterior

Look for signs of accidental damage, abuse, or neglect. Keyboard failures are often caused by spilled liquids, sprayed cleaning solvents, staples, or paper clips.

Are there any dents or deep scratches on the exterior of the terminal or keyboard?

If so, ask the user how and when the damage occurred.

It may contribute to the problem with the unit.

Terminal and Keyboard Interior

Open the cases and inspect the keyboard and terminal interiors.

• Wiring Harness: Check the condition of the wires and look for crushed insulation, exposed wires, and loose or broken connectors. Unplug the connectors and check that the pins are intact.

• Circuit Board: Check for loose chips, bent pins on chips, defective chip sockets, defective components and traces, poor solder joints, open fuses, and signs of overheating and burning. Check that devices are properly installed.

• Keyboard: Check for signs of spilled liquids, foreign objects, unplugged devices,

TESTS AND ADJUSTMENTS

This section describes how to test the 9320's video monitor and how to make internal adjustments.

You can test the display geometry of the video monitor in the following six areas to make sure that it's functioning properly. Be sure to view the screen straight on to avoid parallax errors.

• Height and width

• Linearity

• Brightness

• Trapezoidal distortion

• Concave and convex distortion

• Display stability

For many of these tests, you must call up the alignmenttest display (a screenful ofE characters). To do this, make sure your 9320 is in 9320 emulation mode and block mode; then press Esc

#

8.

Height and Width

First measure the height and width of the display.

Next, switch to reverse video (35

+

/-3fL for amber, 20

+

l-fL

for white), with thefollowingconditions: 80 columns, normal status line.· Then measure the height and width again, using the following criteria:


Maintenance

3-1

Height:

Width:

174 mm (maximum)

170 mm (minimum)

239 mm (maximum)

235 mm (minimum)

Concave and Convex Distortion

Then test concave and convex distortion (pincushion and barrel): measure the height of the display at the left side, middle, and right side; measure the width of the display at the top, middle, and bottom. In each case, the curvature of the display must not exceed 1.5 mm.

Linearity

Next call up the alignment test display (screen filled with Es) and measure the horizontal and vertical linearity of the display, using horizontal and vertical slot gauges. Take one reading for at least the fitst, middle, and last column and for at least the top, middle, and bottom row.

Count ten Es across and find the left edge of the eleventh E. Then count ten Es up and fmd the bottom edge of the eleventh E. The criteria are as follows:

Horizontal: 29.1 mm (maximum)

26.3 mm (minimum)

Vertical: 33.9 mm (maximum)

30.6 mm (minimum)

Display Stability

Finally, check display stability for the voltage and line frequencies given below. Conduct each test at the minimum, nominal, and maximum value.

AC Voltage: 127V (maximum)

115V (nominal)

103V (minimum)

253V (maximum)

230V (nominal)

207V (minimum)

Frequency: 63 Hz (maximum)

60 Hz (nominal)

57 Hz (mimimum)

53 Hz (maximum)

50 Hz (nominal)

47 Hz (minimum)

Brightness

Next test the brightness with a light meter: switch to inverse video, set the contrast to maximum, clear the screen of all characters, and take five readings (one at the center of the screen and one at each corner). The criteria are as follows:

Center:

Corner:

35.+I-fL

Center

+

1-10%

Trapezoidal Distortion

Measure the height of the display at the left side and at the right side; then measure the width of the display at the top and the bottom. In each case, the pair of measurements must be within 2 mm of each other.

Making Adjustments .

You can adjust the picture on the 9320's video monitor using one of the following:

Brightness

Focus

PotR510

PotR506

Contrast

Height

Vertical Linearity

Horizontal width

PotR401

Pot R304

PotR308

CoilL501

Maintenance

3-2


TROUBLESHOOTING

This section is a guide to component-level repair of the logic board and keyboard modules. Find the symptoms in Table 3-1 that resemble the problems in the terminal you are repairing. Then locate the suspected defective components.

If you are not sure that a component is satisfactory, replace it before proceeding to the next test point. Before replacing a chip or component, check its inputs and outputs for proper levels and signal quality.

Table 3-1. Troubleshooting Guide

Symptom

DisplayNideo

No display, no beep, fails selftest

Component

Location

Schematic

Page

Distorted video

Incorrect characters

No vertical sync

No cursor

Loss of attributes

SYS.RAM

V13

CPU

U14

Power monitor Ul0

Gate array

EPROM

Power supply

U26

Ull, U12

2672

6264

Gate array

Video section

U15

U13

U26

6264

2681

Gate array

Char RAM

EPROM

U13

U9

U26

U36

Ull, U12

8049 (Kybd) U2

2672

7406

U15

U20

2672

Gate array

U15

U26

Gate array

6264

- -

U26

U13 lof4 lof4 lof4

4of4 lof4

2of4 lof4

4of4 lof4

30f4

4of4

2of4 lof4

KYBD

2of4

2of4

2of4

4of4

4of4 lof4


3-3

Maintenance

Table 3-1. Troubleshooting Guide (Continued)

Symptom

Communications

No full-duplex communication (FDX) at P3

Component Location

No full-duplex communication (FDX) at P4

No status signal transmitted

(DSR, DCD, CTS, DTR)

No status signal received (DCD, CTS)

All keys inoperative

One key inoperative

SHIff, CTRL,

ALPHA LOCK, and function keys inoperative

No keyclicklno beep

2681

3488

75146

2681

3488

75146

3488

2681

U9

U2

U4

U9

U1

U3

U2

U9

75146

2681

U4

U9

Gate array U26

8049 (Kybd) U2

7414 (Kybd) U1

Keyswitch

8049 (Kybd) U2

EPROM

UU, U12

8049 (Kybd) U2

Transducer

2N2222

Gate array

Speaker

01

U26

Schematic

Page

30f4

30f4

30f4

30f4

30f4

30f4

30f4

30f4

30f4

30f4

40f4

KYBD

KYBD

KYBD

10f4

KYBD

40f4

40f4

40f4

Maintenance 3-4


REMOVING THE PC BOARD

Opening the Case

I

WARNING

I

, . . . . . . . . . . . . . . . . • • •

\..In

I ana capacitors retaiii high voltages even after power has been turned off. Always discharge the CRT as soon as you open the case.

Without touching any of the metal surfaces, pick up a screwdriver by its insulated handle and slip the tip of the screwdriver under the plastic cap that covers the anode, as shown in Figure 3-1.

Then touch the metal frame of the CRT with the shaft of the screwdriver. (You may need a second screwdriver to reach the CRT frame from the anode.)

Use Figure 3-2 as reference for opening and closing the terminal case. .

1. Turn off the terminal.

2. Disconnect the power cord and data cable(s) from the back of the terminal; disconnect the keyboard cable from the left side of the terminal.

3. Remove the bezel from the front of the terminal by pressing down on the top section to release it and pulling it away.

4. Remove the two Phillips screws from the rear of the terminal using a size 1 Phillips screwdriver (Xcelite X1010).

5. Remove the cover by releasing the two plastic "gripper" tabs near the top in each side of the CRT and pushing to the rear.

INSULATED HANDLE

SCREWDRIVER

Figure

3-1.

Discharging Voltages


3-5

Maintenance

\\\\\\\\\\\\\

\\\\\\\\\\\\\

\\\\\\\\\\\\\

\\\\\\\\\\\\

\\\\\\\\\\\\

\\\\\\\\\\\\

\\\\\\\\\\\\

\\\\\\\\\\\\

\\\\\\\\\\\\

Figure

3-2.

Opening the Terminal Case

Removing the Circuit Board

Use Figure 3-3 as reference for removing and replacing the circuit board.

1. Turn off the terminal and remove the cover, as described above.

2. Loosen the two Phillips screws just below the

CRT on each side. These will release the two ground wires.

3. Turn the unit around and remove the two

Phillips screws that hold the circuit board down, using a size 1 Phillips screwdriver.

4. Disconnect the voltage lead on the anode by gently lifting the rubber cap and unhinging the metal lead. (See WARNING, p. 3-5.)

5. Carefully remove the CRT connector (small round connector on the back of the CRT).

6. Remove the yoke connector (blue) from the circuit board.

7. Tilt the CRT forward by loosening the lower screws for the CRT support brackets. These are spring-loaded, and tilt the CRT forward automatically whenever the screws are loosened.

8. Pull the circuit board out through the rear of the chassis.

Replacing the Circuit Board

Use Figure 3-3 as reference for removing and replacing the circuit board.

1. Slide the circuit board in through the rear of the chassis.

Maintenance 3-6


2. Move the bezel into position to make sure that the power switch is aligned with its opening through the bezel.

3. Replace the two Phillips screws that hold the circuit board down, using a size 1 Phillips screwdriver.

4. Tilt the CRT back into position by tightening the lower screws for the CRT support bracket.

5. Reconnect the voltage lead to the CRT's anode:

Figure

3-3.

Removing the Circuit Board


3-7

Maintenance

a. Pull back the rubber umbrella of the anode cap, exposing the metal leads. b. Pinch the two leads together, insert them into the glass opening on the side of the

CRT, and then release them. i c. Smooth the rubber umbrella over the surface of the glass.

6. Replace the CRT connector (small round PC board on the back of the CRT).

7. Replace the yoke connector (blue) from the circuit board.

8. Tighten the two Phillips screws just below the front of the CRT on each side (along with the two ground wires).

Closing the Terminal Case

1. Replace the cover: a. Slide the cover into position. b. With the seven tabs aligned with their slots, push the cover into the frame until the two tabs snap and the cover is seated. c. Replace the two screws that fasten the cover to the back of the chassis.

2. Replace the bezel: a. Turn the unit around so that you are facing the screen. b. Slide the bezel into position. c. Make sure that the power switch is aligned on its opening, the sliding brightness switch is aligned on the plastic tab, and the tabs are aligned on their slots.

I

CAUTION

I

Make sure the power switch is aligned with its opening before you snap the bezel into place. Otherwise, the bezel may damage the switch. d. Once the power switch, the slide switch, and the three tabs are all aligned, pop the bezel into the frame.

Opening the Keyboard Case and

Removing the Keyboard Circuit

1. Disconnect the helical cable from the left side of the terminal.

2. Turn the keyboard upside down and remove the two Phillips screws from the two sides of the housing.

3. Turn the keyboard over again and lift off the top cover, pressing the plastic tabs on the under side as needed.

4. Lift the entire assembly out of the keyboard case.

Replacing the Keyboard Circuit and

Closing the Keyboard Case

1. Place the assembly back onto the keyboard case.

2. Replace the top cover, pushing the tabs into their respective slots.

3. Turn the keyboard upside down and replace the two Phillips screws.

4. Reconnect the helical cable to the opening on the left side of the terminal.

Maintenance 3-8


4 Parts and Service

ORDERING SPARE PARTS

,,rou can order spare parts by telephone, telex or by written purchase order. (All telephone orders must

I be followed by a confirming purchase order clearly marked "Confirming Purchase Order.") To place an order, contact the Tele Video Regional Sales Office in your area, or contact our Corporate Spare Parts

Order Entry Department at the following address. All orders are shipped F.O.B. our designated site.

Tele Video Systems, Inc.

1170 Morse Avenue

P.O. Box 3568

Sunnyvale, CA 94088-3568

Phone: (408) 745-7760

Fax: (408) 734-1927

TWX:

(910) 338-7633

Telex: 474-5041 TVISYS

NOTE: The parts listed here in Table 4-1 are the only parts available from TeleVideo; the parts listed in Table 4-2 are for reference only.

Table 4-1. Recommended Parts List

Part Number Description

122911-00

131386-00

133110-00

133043-00

133045-00

133158-00

132979-00

132979-01

134010-00

133002-00

133049-00

133059-00

133075-00

133104-00

133076-00

132897-00

Power cord, 6 ft (OPe)

Battery, lithium cylinder

PCB Assembly, 9320

Bezel, front, 9320

Housing, rear, 9320

Carton, shipping, 9320

Shipping styrofoam, left

Shipping styrofoam, right

Operator's Manual, 9320

Maintenance Manual, 9320

Knob, power

Knob, brightness

Link knob, brightness

Keyboard, 9320

Keyboard cable

Keycap set, 9320 complete

List Price

10.00

6.00

5.00

10.00

15.00

17.00

15.00

15.00

20.00

50.00

5.00

5.00

5.00

149.00

15.00

21.00


4-1 Parts and Service

Table 4-1. Recommended Parts List (Continued)

Part Number

131158-00

131159-00

132474-00

Description

- - - - - - - " - "

Keyswitch, momentary

Keyswitch, momentary mar, Hitek

Key stoppers (100 per package)

271045-00

180003-00

271049-00

271171-00

130222-00

271189-01

271189-02

293551-00

IC, 65C816 microprocessor (U14)

IC, EPROM, system, 9320 (U12)

IC, Gate array (U26), 9320

Transformer, flyback (T503)

IC 2681, dual UART (U9)

Tube, CRT, 14", flat, pro, white

Tube, CRT, 14", flat, pro, amber

Yoke, deflection, DY-2016D

All prices are subject to change without notice. Minimum spare parts order is $50.00.

List Price

5.00

5.00

18.00

32.00

32.00

27.00

14.00

27.00

65.00

65.00

11.00

NOTE: Tele Video does not stock any of the following parts--only the parts listed in Table 4-1.

Table 4-2. Parts Reference List

PCB ASSEMBLY

Description

IC 3488 2x line driver

IC 75146 2xDIFF line receiver

IC 2681 dual UART

IC 1231 power monitor

IC system EPROM

IC static RAM 8K x 8 lOOns low power

IC 65C816 microprocessor 5 MHz

IC 2672 CRT controller, 5Mz

IC 74S174 6x inverter buffer/driver

IC 74S157 4x 2-to-1 data select

IC 7406 6x inverter buffer/driver

IC 74S04 6x inverter

IC gate array

IC 74S32 4x 2-in positive OR gate

IC 74S08 4x 2-in AND gate

IC static RAM 8K x 8 70ns

IC 74ALS245 bus transceiver 3-state

IC static RAM, 8K x 8 lOOns

IC 74S374 8x D-type flip-flop

Location

U1,2

U3,4

U9

U10

Ul1,12

U13

U14

U15

U16

U18, 22-24

U20

U21

U26

U27

U28

U29, 36

U32,33

U34

U35

Parts and Service 4-2


Table 4-2. Parts Reference List (continued)

PCB ASSEMBLY (CONTINUED)

Description

Cry 3.6864 MHz

'"'_. _ ....... A A A.c ..... O ~ U ....

v l y

U~'"' "'t""T."'T-'~

.1V..L.L.L.L.

Cry 26.9892 MHz

Res CF 150 ohm

1/4W 5%

Res CF 47K ohm

1/4W 5%

Res CF 27K OHM l/4W 5%

Res CF 10K ohm

1/4W 5%

Res CF 4700 ohm

1/2W

+

1-

5%

Res CF 1000 ohm l/4W S%

Res CF 330 ohm

1/4W

+

1-

5%

Res CF 100 ohm l/4W 5%



Res CF 470 ohm

1/4W 5%

Res CF 2.2M ohm l/2W 5%

Res CF 47 ohm

1/4W 5%

Res CF 180 ohm

1/4W

S%

Res CF 82 ohm

1/4W 5%

Res PK 4.7K ohm 10-pin sip

Volt reg, 79L05AC

Trau, 2N2222A metal

Trau, 2N4264 NPN

Cap gl pk O.luF 25V

+

80%

Cap gl pk 330pF 25V

Cap elec 22uF 16V

+

1- 20%

+

80%

Cap tant 0.68uF 50V 10%

Cap taut 4.7 uF 16V

+

1-10%

Cap mono O.01uF 50V 10%

Cap gl pk 100pF 50V 10%

Cap cer 220pF 50V 5%

Cap cer 33pF 100V 10% radial

Cap gl pk 10pF 25V

+

1-20%

Cap elect 1uF SOV 20% radial

Cap elect 10uF 16V 80%

Cap cer lS0pF 50V 10% radial

Cap mica 10pF 50V 5%

Diode zener 1N974B

Diode 1N5817 Schot bar reet lAC

Diode 1N914

Diode 1N4001


4-3

Location

Y1,4

Y2

Y3

R1

R2,6,7

R3, 4, 9, 10

R5,8

R11, 23, 30, 36

R12, 13, 24, 28

R14,20,21

R15

R16, 22, 35

R17

R18, 19,29

R25

R26

R27

R32,33

RP1

U38

Q1

Q2,3

C1, 9, 10, 15-26,28, 30-32, 34, 35,

37-39,43-46,49-54,57-62,69

C2-8,11-14

C27,64-66

C29

C33,56

C40

C41

C42

C47

C48

C55

C63

C67

C68

CRl-4

CR5-7

CR8

CR9,10

Parts and Service

Table 4·2. Parts Reference List (continued)

PCB ASSEMBLY (CONTINUED)

Conn 4P modular jk RJ11

Conn 6P modular jk DEC eqv

Conn 25p D-sub fern short pcmt

Conn 25p D-sub male short pcmt

Conn 2phdr str lp

Conn 3p hdr str lp

Socket 40p IC DIP

Socket 28p IC DIP

Socket 84p chip carrier

Transducer, audio

PCB ASSEMBLY VIDEO MONITOR

Res CF 4700 ohm 1/4W 5%

Pot trim 330K ohm NVR 83 HDZ

Res CF 100 ohm 1/4W 5%

Pot trim lOOK ohm NVR 83 HDZ


Res CF 390K ohm l/4W 5%


Res CF 220K ohm l/4W


Res CF 56K ohm 1/4W


Res CF 3.3 ohm l/4W

Res CF 1 ohm 1J2W 5%

Res CF 68K ohm

+

/-5% 1/4W

Res CF 3.3 ohm 1/2W

Pot trim 470 ohm NVR 83 HDZ




Res CF 2.2K ohm 1/4W 5%






Res CF 1M ohm 1/4W

+ /-

5%

Pot trim 2.2M ohm NVR 83 HDZ


Res MOS 1K ohm 2W

Parts and Service 4-4

P1

P3,4

P5

P6

Wl-3,5

W7, 9,13-15

U9, 14, 15

Ull-13,29,30,34,36,37

U26

Speaker

R301

R302, 308, 510

R303, 305, 318

R304

R306,513

R307,507

R309, 508, 509

R310

R311,511

R312

R313

R314

R315

R316

R317

R401

R402

R403

R404,501

R405

R406

R500

R502

R503

R504

R505

R506

R 512, 515, 516

R514



PCB ASSEMBLY VIDEO MONITOR (CONTINUED)

Description

Cap PF O.luF SOV

Cap cer 470pF SOV

Cap elect 10uF 16V 10% radial

Cap elect 1000uF 16V 10% 13x16mm

Cap cer 220pF SOV 5%

Cap elect lOOuF 2SV

Cap cer O.01uF SOV 20%

Cap elect 22uF 16V 20%

Cap elect 4.7uF 16V

Cap PF 0.033uF SOV 5%

Cap PP 0.018uF 400V

Cap MF O.OlpF 630V

Cap elect lOOuF SOV

Cap elect 2.2uF 2SV 10% NF

Cap MP 0.047uF 630V 10% radial

Cap elect 22uF 100V

Cap elect lOOuF 100V radial Ids

Cap PF O.01SuF SOV 10%

Cap PF O.OOluF 400V

Tran 2N2222A metal

Tran 2N2369A

TranBF2S9

Tran KTC200Y

Tran BU407 TO-220 w/mica

Coil width

Coil linearity fIXed

Pot sliding lOOK ohm O.lW

Spark gap 1.0pF 1KV cer cap

Conn 4p hdr w/lock blue

Socket crt 7p wJhrn CSAS

Diode 1N4004 mot

Diode 1N4148

Diode zener 1NS234B 6.2V

DiodeMR8S6

DiodeBA1S9

Diode FR1S7

IC vert amp TDA-1170N

Trans H drive HDI-8224A

Trans focus FT -90010

Trans flyback

Location

0401

0402

0501

0502

LS01

LS02

RT1

SG1

Yoke

CSOS

C508

CS10

CSll

CS12

C513

CS14

0301

C301-304, 307, 310, 507

C305

C306,402

C308, 309, 313, 509

C311, 401, 506

C312

C403

CSOO

CS01

CS02

CS03

CS04

D301

D302,S01

D401

DS02,S03

DS04-S06,508

D507

IC301

TS01

T502

TS03




Description

PCB ASSEMBLY POWER SUPPLY

IC3524ADIP

Res CF lOOK ohm 1/2W 5%

Res MF l80K ohm lW 5%

Res MaR 22K ohm 2W 5%

Res CF 470K ohm 1/2W 5%

Res MaR l.8K ohm 2W 5%

Res CF 3300 ohm 1/4W 5%

Res CF 4700 ohm 1/4W 5%



R.es CF 2.7K ohm l/4W

+

/-5%


Res CF 1000 ohm 1/4W 5%

Res CF 2.2K ohm 1/4W 5%

Res CF 47 ohm 1/4W

+

/-5%

Res MaR 0.3 ohm lW 5%


Res CF lK ohm 1/2W 5%

Res 39 ohm 1/4W 5%


Cap m/paper 4700pF 250V Y -type

Cap mp 0.047uF 250V X-type

Cap mp 0.0047uF 250V Y-type

Cap elect 100uF 200V RS

Cap cer O.OluF lKV

Cap elect 100uF 35V

Cap cer 470pF lKV 20%

Cap cer 0.022uF 50V

Cap cer O.OluF 50V 20%

Cap cer 220pF 50V 5%

Cap elect 47uF 25V 20% radial

Cap cer O.luF 50V 10%

Cap mylar 0.022uF 50V 20%

Cap PF O.luF 50V 10%

Cap elect 10uF 25V RS

Cap elect 100uF 25V RUF

Cap elect 1000uF l6V R UF

Cap elect 1000uF 10V RUF

Transistor switching MJE 13007 A

Transistor SGS 13003T

Transistor 2N2222A NPN/silicon

Transistor KN2907

Parts and Service

4-6

Location

C112

C113

C114

C115

C116

C117

C118

C119

C201,202

C203,204

C205,206

0101

0102

0103

0201

UlOl

RlOl, 102

Rl03

Rl04

Rl05

R106

Rl07,112

Rl08, 110, 111

Rl09

R113

R114

R115

R116,206

R117, 119,205

R118

R120, 121

R20l

R202

R203

R204

ClOl, 102

C103,104

C105,106

Cl07,108

Cl09

C110

Cl11



PCB ASSEMBLY POWER SUPPLY (CONTINUED)

Description

Diode bridge RS-205

Diuoe fast feCOVeIY

PR -105

Diode fast recovery FR -102

Diode 1N4148

Diode SR106 Schottky

Heat sink K01S0-3

Diode zener 10V 1W

Diode zener 13V 1/2W

Diode zener S.6V 1/2W

Coil choke

2SV

Coil choke

8V

Coil line filter T30-03

Transformer main T30-01

Transformer feedback T30-02

Transformer sync P40-04A

Thyristor TYN-058 50V 8A

Thermistor 10.0 ohms 3A

Pin selector R93-31

Label voltage 115V SMPS

Washer M3 flat st zn, nut M3 hex st zn, screw bh m3x10

Fuse 1.6A 125V 5x20mm SB, clip fuse dia 5

Clip gnd 965 (SN-plate)

Heat sink

(BV406) 965, insulating pad 0.125 id 0.150 od

Sw main smk JP39 965

Pot trim 5K ohm 1/2W 82MRSK

Socket 16p IC DIP

PCB ASSEMBLY KEYBOARD VT-320

IC 7414 6x Schmitt trig



Cap tant 22uF 25V

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Cap mica 10pF 50V 5%

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Wl-16



SERVICE INFORMATION

If your terminal has technical problems that you can't solve on your own, Tele Video's Technical

Support Department will assist you. The phone number is

(408) 745-7760. International customers can telex

474-5041. Or you can call your regional sales office, listed in this section.

4. For fastest service, write the RMA number on the shipping labe1. If the RMA number is missing, the entire procedure will be delayed considerably.

5. Use the RMA number if you call to ask about your terminal while it is being repaired.

6. If the item is under warranty, it will be returned to you via best way. All express shipments will be at the customer's expense and must be requested when receiving the

RMA.

Return Procedure

Tele Video products are covered by a limited warranty, found in this section. For service under warranty you must return products to Tele Video's factory repair facility.

1. To return a terminal or part for service, call

Customer Service for a Return Material

Authorization (RMA) number.

2. Have the following information ready: a. Your name and your company's name, address and telephone number. Give a street address, since freight delivery services do not deliver to a post office box. b. Your terminal's model number and serial number. c. A brief but accurate description of the problem. If you have more than one problem, list each problem separately. A separate RMA will be issued for each item. Tele Video can repair only the problems described on an RMA.

3. Tag each item to be returned with the RMA number and your description of the problem.

This is especially important if you plan to ship more than one part in the same container. See the Operator's Manual for information about packing the terminal for shipment.

Regional Sales Offices

Corporate

1170 Morse Avenue

P.O. Box 3568

Sunnyvale, CA 94088-3568

(408) 745-7760

Los Angeles

15303 Ventura Blvd., Suite 900

Sherman Oaks, CA 91405

(818) 907-5563

(818) 378-0194 (car phone)

Newport Beach

1200 Quail St., Suite 170

Irvine, CA

92715

(714) 476-0244

Chicago

1002 E. Algonquin Road, Suite 112

Schaumburg, IL 60195

(312) 397-5400

Texas

1431 Greenway Dr., Suite 110

Irving, TX

75038

(214) 550-1060

Parts and Service

4-8


Atlanta

6075 The Comers Parkway, Suite #208

Norcross, GA 30092

(404) 447-1231

Ohio

Four Commerce Park Square

23200 Chagrin Blvd, Suite 600

Beachwood, OR 44122

(216) 292-8187

216) 464-7609 (FAX)

Telex: 433-2054

Virginia

International Bldg., Suite 1200

8150 Leesburg Pike

Vienna, VA 22180

(703) 893-1663 or 1671

(703) 790-5933 (FAX)

New York

6900 Jericho Turnpike, Suite 100 LL

Syosset, NY 11791

(516) 496-4777

Massachusetts

1601 Trapelo Road

Reservoir Place

Waltham, MA 02154

(617) 890-3282

United Kingdom

The Business Centre

Molly Millars Land

Workingham

Berkshire RG112QZ

England

Phone: 011-44-734-771800

FAX: 011-44-734-772461

Telex: 847169

The Netherlands

Saturnusstraat 25

2132 HB Roofdorp

The Netherlands

Phone: 011-31-2503-35444

Telex: 74615 TLVDO NL

France

3 his rue leCorbusier bat. Berne Silic 244

94568 Rungis Cedex, France

Phone: 011-33-1687-34-40

Telex: 205191F

FAX: 011-33-1-4686-0222

Germany

Einsteinstrasse 1

6108 Weiterstadt

Frankfurt, West Germany

Phone: 011-49-6150-14076/78

Telex: 6150912

FA){:011-49-6150-12971


4-9

Parts and Service

5 Schematics

T able 5-1 gives a brief description of the ICs on the logic section of the circuit board. Although there is only one circuit board, note that you can read the revision levels of the logic board, video board, and power supply as if they were three separate boards. Find the word "Revision" on the side of the circuit board, followed by three letters (such as "E B D"). These letters indicate the revision levels of each module in the following order: logic board video board power supply

For example, if you see "Revision E B D" on the side ofthe board, this means level E (logic board), level

B (video board), and level D (power supply).

Table 5-1. Circuit Board

Ie

Refereuce

Location

Schematic

Page

U1D un

U12

V13

V14

V15

V16

V18,22-24

V29

V32,33

V36

V1,2

V3,4

V9

V26

V34

V35

2

2

2

2

2

2

1

1

1

1

1

3

3

3

4

4

4

Type/Description

IC DS1231 power monitor

IC 27512 user EPROM

IC 27512 system EPROM

IC 6264LP system NVR

IC 65C816 microprocessor 5MHz

IC 2672 CRT controller 5MHz

IC 74S174 hex D flip-flop

IC 74S157 4x 2-to-1 data sel

IC 20256 8k x 8 attribute RAM

IC 74S245 bus transceiver 3-state

IC 20256 8k x 8 character RAM

IC MC3488 4x line driver

IC 75146 4x line receiver

IC 2681 dual

VART

IC gate array

IC 8k x 8 character generator

IC 74S374 8x D-type flip-flop


Schematics

5-1

A Service Bulletins

Installing Additional Display

Memory

T he standard 9320 terminal is shipped with two pages of memory. However, it's possible to upgrade the display memory to eight pages by installing two RAM chips. The instructions are as follows:

IWARNING I

Do not open the terminal case unless you are a qualified technician. Opening the case exposes you to hazardous voltages, even after the power is turned off and the cord is disconnected.

Tools required:

• Medium Phillips screwdriver

• Small flat screwdriver (or chip puller)

Parts required:

Two 32K x 8, 70ns static RAM chips (Mitsubishi

M5M256AP-70, Sony CXK58256PN-70L, or equivalent)

Procedure:

1. Remove the circuit board, following the steps given in Section 3.

2. Locate the existing 8K x 8 RAM chips (locations U29 and U36). Using a small flat screwdriver (or chip puller), remove the two chips from their sockets, noting the direction of the notches.

3. Insert the 32K x 8 RAM chips into the two sockets just vacated. Avoid the most common mistakes: a. Make sure the notches are facing the right direction. b. Make sure the pins are aligned with the openings, and avoid bending any of the pins when inserting the chips.

4. Find the jumpers at locations W6 and W8; lift the jumpers from position 1-2 and replace them on position 2-3 .

5. Replace the circuit board, following the steps given in Section 3.

This completes installation. The terminal will now operate with eight pages of display memory.


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