Zenith ZVM-133-TC User manual

585-141-1
SERVICE MANUAL
Color Video Monitor
with
Touch Control
ZVM-133-TC
2N1'. data
~ systems
860-127-1

The purpose of this page is to make sure that all service bulletins are
entered in this manual. When a service bulletin is received, mark the man-
ual and listthe information in the record below.
Record of Field Service Bulletins
SERVICE DATE
BULLETIN OF CHANGED
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LIMITED RIGHTS LEGEND
Contractor is Zenith Data Systems Corporation of St. Joseph, Michigan 49085. The entire
document issubjectto
Limited Rights data provisions.
Copyright ©
1985 by Zenith Data Systems Corporation
Printed in the United States of America
Zenith Data Systems Corporation
St. Joseph, Michigan 49085
INITIALS

Chapter 1 Characteristics
Description ................................... 1-1
Controls, Indicators, and Connectors . . . . . . . . . . . . .. 1-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3
Chapter 2 Installation
Chapter 3 Circuit Descriptions
Monitor ................ . . . . . . . . . . . . . . . . . . . . . . 3-1
RGB Gain Control Board ..................... 3-1
RGB Signal Input ......................... 3-1
RGBI Input .............................. 3-1
Main Board ................................ 3-1
Start-up and Operating Voltages ............ 3-1
Degaussing Circuit ........................ 3-2
Power Supplies
.......................... 3-2
+150 VDC Supply ....................... 3-2
+26 VDC Supply ........................ 3-2
+ 12 VDC Supply ........................ 3-2
RGB Drive and Cutoff Voltages . . . . . . . . . . . . . 3-3
Vertical Sync
............................ 3-3
Horizontal Sync
.......................... 3-3
Horizontal and Vertical Drive Outputs
........ 3-3
High Voltage and Horizontal Sweep Board ...... 3-4
Width Step Board
........................... 3-4
Video Output Board
......................... 3-4
Touch Control ................................ 3-4
Logic Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Bipolar ± 12 VDC Power Supply
............ 3-4
+5 VDC Power Supply ................... 3-4
Reset
................................... 3-5
Timing
.................................. 3-5
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Main CPU Interface
....................... 3-5
Strobe Synchronization
.................... 3-6
Infrared LED Strobe Sequence
............. 3-6
Infrared Detection
......................... 3-7
Digital Infrared Detection Automatic Gain Control. 3-7
LED Drive ............................... 3-7
Chapter 4 Servicing
Safety and Service Guidelines ................... 4-1
AC Leakage Test ............................. 4-1
Other Precautions ............................. 4-2
Suggested Tools and Supplies
.................. 4-2
Test Equipment
............................... 4-2
Contents
Troubleshooting ............................... 4-3
Monitor Fault Isolation Procedures
............... 4-4
Monitor Alignments and Adjustments. . . . . . . . . . . . . . 4-5
Main Board Adjustments ..................... 4-7
RGB Cutoff and G2 Adjustments ............ 4-7
RGB Drive Adjustments ................... 4-7
Vertical Height and Vertical Center Adjustments. 4-7
Horizontal Width and Horizontal Center Adjustments
........................................ 4-7
Horizontal Oscillator Adjustment
............. 4-8
+95 Volt Adjustment ...................... 4-8
Sweep Assembly Adjustments
................. 4-8
Focus Adjustment
........................ 4-8
Width Selection
.......................... 4-8
Monitor Performance Tests
...................... 4-9
Fill The Screen Test ........................ 4-9
Color Bar Test
............................. 4-9
Basic Program
............................ 4-10
Touch Control Sensitivity Adjustment ............ 4-10
Touch Control Fault Isolation Procedure
.......... 4-11
Touch Control Alignment and Checkout .......... 4-14
Logic Board Dip Switch
S101 ................ 4-14
Touch Control Performance Test
................ 4-15
Cleaning Procedure
........................... 4-16
Servicing Diagrams
........................... 4-16
Chapter 5 Disassembly/Reassembly
Back Cover (10) .............................. 5-1
Top Cover (20) ............................... 5-1
Video Output Board (70) ....................... 5-1
Cabinet Front (150) ............................ 5-1
Primary Control Board (125) .................... 5-1
RGB Gain Control Board (135) .................. 5-2
Main Board (85) .............................. 5-2
High Voltage and Horizontal Sweep Assembly (77) . 5-2
CRT Disassembly (105) ........................ 5-2
CRT Reassembly (105) ........................ 5-3
Logic Board (65)
.............................. 5-4
LED Boards and Collector Plates ................ 5-5
Chapter 6 Parts List
Figures
1-1: Monitor Front View ....................... 1-1
1-2: Monitor Rear View . . . . . . . . . . . . . . . . . . . . . . .. 1-2

3-1 : Light Pipe Assembly ...................... 3-8
4-22: Video Output Board Schematic ............ 4-27
4-1: AC Leakage Voltmeter Circuit .............. 4-1
4-2: Adjustments -Monitor Rear View .......... 4-6
4·3: Main Board Adjustments
................... 4-7
4-23: Logic Board Component Location .......... 4-28
4-24: Logic Board Waveforms .................. 4-28
4-25: Logic Board Schematic ................... 4-29
4-26: X-Axis and Y-Axis LED Carrier Schematic ... 4-30
4·4: High Voltage and Sweep BoardlWidth Step Board
Adjustments
............................. 4-8
4-5: LED Strobe Pulses (TP1) ................. 4-10
4-27: Primary Control Board Component Location . . 4-30
4-28: Primary Control Board Schematic .......... 4-30
4-6: Installation of Plastic Grid ................. 4-17
4-7: 595-4177 (30-1166) Plastic Grid Overlay
6-1 : Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
(full-size)
............................... 4-18
4-8: Block Diagram .......................... 4-19 Tables
4-9: RGB Gain Control Board Component Location
and Waveforms ......................... 4-20
4-10: RGB Gain Control Board Schematic ........ 4-21
4-11: Main Board Component Location . . . . . . . . . . . 4-22
4-1: General Troubleshooting ................... 4-3
4-2: Logic Board Transistor Voltages ........... 4-13
4-3: S101 Settings ........................... 4-14
4-12: Main Board Waveforms ................... 4-22
4-13: Main Board Schematic ................... 4-23
6-1 : Monitor Major Assembly Parts List .......... 6-1
6-2: Cable Assemblies Parts List ................ 6-4
4-14: High Voltage and Horizontal Sweep Board Component
6-3: A-13336 Parts List ........................ 6-4
Location
............................... 4-24
6-4: 9-227-07 Parts List ....................... 6-7
4-15: High Voltage and Horizontal Sweep Board
6-5: 9-247-08 Parts List ...................... 6-12
Waveforms
............................. 4-24
6-6: A-10530 Parts List ....................... 6-14
4-16: High Voltage and Horizontal Sweep Board
6-7: A-11105 Parts List ....................... 6-14
Schematic
.............................. 4-25
6-8: A-10632-03 Parts List .................... 6-15
4-17: High Voltage Power Supply Component
6-9: 9-155-12 Parts List ...................... 6-15
Location
............................... 4-26
6-10: 9-356 Parts List ......................... 6-17
4-18: Width Step Board Component Location ..... 4-26
4-19: Width Step Board Schematic .............. 4-26
4-20: Video Output Board Component Location .... 4-27
4-21: Video Output Board Waveforms ............ 4-27 Listings
4-1: BasiC Color Bar Program ................. 4-10
iv Contents

Description
The ZVM-133- TC is a high-resolution color monitor
with touch control. RGBI input signals are used for
the display and RS-232C output signals supply the
touch control information.
Touch control makes application programs easier and
faster to use. The touch control logic board communi-
cates with the computer, making the usual keyboard
operations unnecessary. Operator training time and
skill level are significantly reduced. The touch control
operator places a finger at a specific screen location
and the touch control logic board identifies the location
for the software in the computer.
The ZVM-133-TC is designed to be used with Z-100
Series and Z-100 PC Series computers.
NOTE: The Z"319 video card must be installed in the
Z-100 PC Series computers.
Controls, Indicators, and
Connectors
Refer to Figures 1-1, 1-2, 4-2, 4-3, and 4-4 for locations
of the following controls, indicators, and connectors.
Front Panel
Power Switch
Power Indicator
Brightness
Contrast
Green/White Switch
Internal
Red LED Touch Indicator
Horizontal Centering
Width
Vertical Centering
Height
Chapter 1
Characteristics
G1
G2
RGB Cutoff
RGB Drive
Horizontal Oscillator
+95 Volts
Width Selection
Sensitivity (Touch Control)
Rear Panel
Focus
Video Input connector
DTE (output) connector
po R
SWITCH
BRIGHTNESS
Figure 1-1
MonitorFront View

Z-100 P
Page 1-2
RGB
VIDEO
OUT
C SERIES
---1'--
Jr~
RS-232C
(OUTPUT) ".,....=--
! I
I SERIAL
VIDEO ~CABLE
INPUT
(RGB-IN)
I J
.~
-~-
RGB
VIDeo
OUT
Z-100 SERIES
VIDEO
CABLE
M Figure1-2
onitor Rear I r
view
Characteristics

Specifications
General
Electrical Power
............................ .
Height
.................................... .
Width
.................................... .
Depth
.................................... .
Weight
................................... .
Monitor
CRT
..................................... .
Phosphor
................................. .
Pixel resolution
............................ .
Text capacity
.............................. .
Video resolution
............................ .
Video bandwidth
........................... .
Rise
time, ................................ .
Horizontal frequency
........................ .
Vertical frequency
.......................... .
Inputs
.................................... .
Touch Control
Sync input
................................ .
Microprocessor clock
........................ .
Touch output
.............................. .
Characteristics
105-130VAC 60 Hz, 1.36 A.
13.75"(350 mm).
15.25"(390 mm).
15.25"(390 mm).
38 pounds (17.2 kg).
13" (330 mm) diagonal.
P-22 pigmented phosphor color.
640dots (RGB), 250 dots.
25 lines of80 characters.
640 pixels horizontal by 240 lines (non-interlaced),
or
by480 lines (interlaced).
20 MHz.
40 nanoseconds.
15.7- 16.8 kHz.
57-62 Hz.
DB-25 type connector.
RGBI signals-TTL level digital positive.
Horizontal sync-TTLpositive ornegative.
Vertical sync-TTL positive ornegative.
IBM intenSity-
TTL level digital positive.
Horizontal sync-TTL positive ornegative.
6.0 MHz.
DB-25 type connector.
RS-232C serial data.
110- 9600 baud (factory set to 4800).
(Factory set to 8-bit and zero parity.)
Page 1-3

Touch area ................................ .
Touch resolution
........................... .
Touch data format
.......................... .
16 x 16 cells
in a 7.5" x 7.5" square centered on
the CRT.
32 x 32 infrared detector matrix.
0.295" horizontal.
0.295" vertical.
Message format will be 8 characters:
<SOH> XxxYyy<CR>
xx and yy are the ASCII representation of the number
00 through 15. Leading zeros will not be suppressed.
The upper left corner ofthe screen is:
X = 00, Y = 00 Logic Board
X =
1, Y = 16 Plato Program
Zenith Data Systems reserves the right to discontinue
products and to change specifications at anytime.
Page 1-4 Characteristics

See Touch Control Performance Test and Touch Con-
trol Alignment and Checkout in the Servicing chapter.
1. Connect the cables as shown in Figure 1-2.
2. Select green or color:
• If the monitor
is to be used only for monochrome
text display, select green by pushing
in the
Green/White switch.
• If the monitor is to be used for graphics display
or text and color display, select color by pulling
outthe Green/White switch.
Chapter2
Installation
3. Turn on the computer and video monitor. The
power indicator on the front of the video monitor
should light.
4. After the monitor has warmed up, adjustthe bright-
ness control forthe desired display brightness.
5. If the monitor is to be used with a Zenith personal
computer, display the color bar from the ROM. Ad-
just the Contrast control so that the eight bars on
the right side of the display have the desired color
intensity.