133002-00_Televideo_9320_Video_Display_Terminal_Maintenance_Manual_Aug88.pdf
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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
\\\\\\\\\\\\\
\\\\\\\\\\\\\
\\\\\\\\\\\\\
\\\\\\\\\\\\
\\\\\\\\\\\\
\\\\\\\\\\\\
\\\\\\\\\\\\\
\\\\\\\\\\\\\
\\\\\\\\\\\\\
\\\\\\\\\\\\
\\\\\\\\\\\\
\\\\\\\\\\\\
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:
9320 Maintenance Manual
+
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
Pin Signal Name Direction
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
Pin Signal Name Direction
Data Terminal Ready n/a
Transmit Data Output
Transmit Signal Ground Input
Receive Signal Ground Output
Receive Data
Data Set Ready
Input
Input
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
)
9320 Maintenance Manual
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
9320 Maintenance Manual
<
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
/
9320 Maintenance Manual
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
9320 Maintenance Manual
\
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
9320 Maintenance Manual
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.
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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.
9320 Maintenance Manual
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
9320 Maintenance Manual
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:
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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 120 ohm l/4W 5%
Res CF 510 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
9320 Maintenance Manual
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 1000 ohm l/4W 5%
Res CF 390K ohm l/4W 5%
Res CF 47K ohm l/4W 5%
Res CF 220K ohm l/4W
Res CF 33K ohm l/4W 5%
Res CF 56K ohm 1/4W
Res CF 10K ohm l/2W 5%
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 68 ohm 1/4W 5%
Res CF 470 ohm 1/4W 5%
Res CF 100 ohm l/4W 5%
Res CF 2.2K ohm 1/4W 5%
Res CF 330 ohm 1/4W 5%
Res CF 33 ohm 1/2W 5%
Res CF 33 ohm 1/4W 5%
Res CF 10 ohm 1/2W 5%
Res CF 330 ohm l/2W 5%
Res CF 1M ohm 1/4W
+ /-
5%
Pot trim 2.2M ohm NVR 83 HDZ
Res CF 10K ohm l/4W 5%
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
9320 Maintenance Manual
Table 4-2. Parts Reference List (continued)
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
9320 Maintenance Manual
4-5 Parts and Service
Table 4-2. Parts Reference List (continued)
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%
Res CF 18K ohm 1/4W 5%
Res CF 10K ohm l/4W 5%
R.es CF 2.7K ohm l/4W
+
/-5%
Res CF 68 ohm 1/4W 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 390 ohm 1/2W 5%
Res CF lK ohm 1/2W 5%
Res 39 ohm 1/4W 5%
Res CF 100 ohm l/2W 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
9320 Maintenance Manual
Table 4-2. Parts Reference List (continued)
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
Res CF 10K ohm 1/4W 5%
Res CF 3300 ohm l/4W 5%
Cap tant 22uF 25V
+
/-10%
Cap tant 4.7 uF 16V
+
/-20%
Cap cer O.01uF 16V 20%
Cap mica 10pF 50V 5%
I
Cry 5.7143 MHz
Diode 1N4148
Socket 40p IC DIP
Wire 30awg Kynar VL 1423 blue A
Location
BD-101
T\1()1
.-..a...V..&.)
1 fl~
..&..v-'
D102
D104-107, 204
D201
D202, 203
ZlO1, 102, 203
Z201
Z202
L201,202
L203
T101
T102
T103
Tl04
SCR201
TH101
115/230V
115V
Q101, ac inlet 2
F101
PD
Q101
SW101
SFR101
V101
V1
R10
Rl-9, 11, 12
C1,7
C2
C3,4
C5,6
Y1
CRl-6
V2
Wl-16
9320 Maintenance Manual
4-7 Parts and Service
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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
9320 Maintenance Manual
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.
9320 Maintenance Manual
A-1
Service Bulletins
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Systems, Inc.
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