Tatung CM-1480 Operating and installation instructions

SERVICE INFORMATION
MODEL CM-1480
COLOUR DISPLAY MONITOR
Code No. 79-1191-2
.. ,,.,, ... :

CM-1480 SERIES COLOUR DISPLAY MONITOR
SERVICE MANUAL
PAGE
CONTENTS
CHAPTER 1. SPECIFICATIONS ........ ····················· .1.1
CHAPTER 2. PRECAUTIONS AND NOTICES
2-1 SAFETY PRECAUTIONS ............. ·········
2.1
2-2 PRODUCT SAFETY NOTICE ........... ········
2.1
2-3 SERVICE NOTES ............ ············· .. 2.2
CHAPTER 3. OPERATING INSTRUCTIONS
3-1 CONTROLS AND CONNECTIONS .......... ······
3.1
3-2 SET UP AND OPERATION ............ ········
3.2
CHAPTER 4. ADJUSTMENTS
4-2 MONITOR ADJUSTMENT DEVICES ......... ·····4.1
4-3 PREPARATION ........... ················· .4.2
CHAPTER 5. TROUBLE-SHOOTING CHARTS
5-1 ORGANIZATION ............. ···············
5
.1
5-2 SAFETY GUIDELINES .............. ·········
5.1
5-3 AC LEAKAGE TEST ........... ············ .. 5.2
5-4 SUGGESTED TOOLS AND EQUIPMEMT .......... ·5.2
5-5 INSPECTION AND PREPARATION ........... ···5.3
5-6 COLOR BAR TEST .............. ········•··· 5.
3
5-7
WHITE FIELD ................. ··········· .5.3
5-8 TROUBLESHOOTING CHARTS ............ ······
5.3
.-

CHAPTER 6. P. C. B LAYOUT
Fig 6-1 PCB-MAIN COMPONENtS LAYOUT ......... ·6.1
Fig 6-2 PCB-VIDEO DRIVE COMPONENTS LAYOUT ... 6.2
Fig 6-3 PCB-CRT DRIVE COMPONENTS LAYOUT ..... 6.2
Fig 6-4 PCB-POWER COMPONENTS LAYOUT ......... 6.3
CHAPTER 7. SCHEMATIC DIAGRAM
Fig 7-1 MAIN CIRCUIT DIAGRAM ........... ·····7.1
Fig 7-2 POWER CIRCUIT DIAGRAM ........... ····7.2
CHAPTER 8. REPLACEMENT PARTS LIST
8-1 ASSEMBLY AS/lIS .......... ·.·············· 8. 1
8-2 ASSEMBLY PCB-MAIN PWB-1323-02 ...........
8.1
8-3 ASSEMBLY, PCB-VIDEO PWB-1324-02 .........
8.7
8-4 ASSEMBLY, PCB-CRT DRIVE PWB-1337-02 .....
8.9
8-5 ASSEMBLY. pcB-POWER PWB-1345-02 .........
S.
10
8-6 ASSEMBLY. PCB-POWER LINE FILTER
PWB-1254-05 .............. ·····
S.
12
8-7 ASSEMBLY. PCB-INDICATOR PWB-1357-01 .....
8.
12
8-S MISCELLANEOUS ............... ············
S.
13
.-

APPLICATION:
POWER INPUT:
VIDEO SIGNAl.S:
SYNC. SIGNAl.S:
CHAPTER 1
SPECIFICATIOIIS
Typical data display device for personal computer
-applications.
90 watts (Nominal), AC rated voltage-refer to backcover
label. A2 metre 3-wire mains cord is supplied.
16 colour: Red. green. blue and intensity video signals.
64 colour: R.G,B, and r,g,b, (intensity) video signals.
All are positive TTL.
Horizontal: 15.75kHz +/- 300Hz (lode 1) or 21.853kHz
+/- 300Hz (mode 2) positive TTL,
autoswitching by TTL.
Vertical: 47-63Hz positive TTL at mode 1.
47-63Hz negative TTL at lode 2.
SIGNAL CONNECTOR: 9-Pin D-shell connector.
DISPLAY TUBE: 14". 90 deflection, 29.1mm neck, 0.31.1 dot pitch.
dot inline. dark tint non-glare. Type No.: M34JDU30X66
DISPLAY AREA: Width: 250mm
Height: 1700
DISPLAY COLOUR: Mode 1: 16 colours. Mode 2: 64 colours.
DISPLAY CHARACTER: 2000 characters (80CH. X25 Rowan 8x8 dot .atrix)
DISPLAY TIME:
RETRACE TIME:
RESO LUTI ON :
KISCONVERGENCE:
Horizontal: mode 1: 44.5us mode 2: 39.37us
Vertical: mode 1: 12.58ms mode 2: 16.01ms
Horizontal: mode 1: 6.0us mode 2: 6.0us
Vertical: mode 1: 1.215 mode 2: 0.615
Horizontal: 640 dots
Vertical:
mode 1: 200 scan lines (non-interlaced)
mode 2: 350 scan lines (non-interlaced)
0.5mm Max. within data area.
USER CONTROl.S: Power on-off, brightness, contrast. vertical size 1,
vertical size 2, Multi colour switch, horizontal centre
1. horizontal centre 2. video reverse SWitch, power
voltage 120VAC/240VAC selector.
SERVICE CONTROLS: H-Hold 1. H-Hold 2. H-Width 2. H-Centre. V-Centre.
V-Hold, Focus. Screen. E-W Pincusion. set ERT. R-Drive.
r-Drive. G-Drive; g-Drive. R-BKG. G-BKG. B+12.75V.
ENVIRONMENTAL: Operation: 10°C to 35°C ambient
Storage: -40°C to 50
0e
DIMENSIONS:
WEIGHT:
Humidity: 50% to 80% (non-condensing)
Altitude:
to 7000 feet above sea level.
365 (W) X 315 (H) X 400 (D) ••
13.Skg (net)
1.1
.-

ENVIRONMENTAL:
DIMENSIONS:
WEIGHT:
Operation: 100e to 35°e ambient
Storage: -40oe to
50
0e
Humidity: 50% to 80% (non-condensing)
Alitude: to
7000 feet above sea level.
365 (W) X 315 (H) X 400 (D) mm
13.5kg (net)
1.2
.-

CHAPTER 2
PRECAUTIONS AND NOTICES
2-1 SAFETY PRECAUTIONS
1. Observe all cautions and safety related notes located inside the
display cabinet
and on the display chassis.
2. Operation of these displays outside the cabinet or with the cover
removed, involves a shock hazard from the display power supplies.
Work on the display should not be attempted by anyone who is not
thoroughly familiar with precautions necessary
when working on high
voltage equipment.
3. Do not install, remove or handle the picture tube in any manner
unless shatter-proof goggles are worn. People not so equipped should
be kept away while handling picture tube. Keep picture tube away
from the body while handling.
4. The picture tube is constructed to limit X-RADIATION to 0.5 mR/HR at
300 microamperes anode current. For continued protection, use the
recommended replacement tube only, and adjust the voltages so that
the designated maximum rating at the anode will not be exceeded.
5. Before returning a serviced display to the customer, a thorough
safety
test must be performed to verify that the display is safe to
operate without danger
or shock. Always perform an AC leakage
current
check on the exposed metallic parts of the cabinet. Proceed
as follows:
Connect the monitor power lead to the mains supply, via an isolation
transformer,
and switch on. Using the test circuit shown in Fig. 2-
1, measure the AC leakage current between each pole (L and N) of the
supply
and all accessible metal parts. The earth leakage current
must not exceed 3.5mA.
MAINS
INPUT
L
N
..
-
==-
E
CONNEC
I~ EXPOSE
T TO
o METAL PARTS
I~I
--
MEASURING CIRCUIT
RESISTANCE. 2000 oh ms
Fig 2-1 AC LEAKAGE CURRENT TEST CIRCUIT
2.1
.-

PRCDU8T SAFETY NOTICE
Xany electrical and mechanical parts in this chassis provide special
visual safety protection.
The protection afforded by them cannot
necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc
..
Before replacing any of these components, read the parts list in this
manual carefully. The use of substitute replacement parts which do not
have the same safety characteristics as specified in the parts list may
create shock, fire, X-RAY radiation or other hazards.
2-3 SERVICE NOTES
1. When replacing parts or circuit boards, wrap the wires around
terminals before soldering.
2. When replacing a high wattage resistor (more than 1/2W) on a circuit
board, keep the resistor about 10mm (1/2 in.) away from circuit
board.
3. Keep wires away from high voltage or high temperature components.
4. Keep wires in their original position so as to reduce interference.
, "ARMIIIG I
CHECK POWER VOLTAGE SELECTOR IS CORRECT
120 VAC OR 240 VAC
.-
-... .......... -"

CHAPTER 3
OPERATING INSTRUCTIONS
3-1 CONTROLS AND CONNECTIONS
;" POWER: The power rocker switch turns the 1I0nitor on
or off.
o MULTI COLOUR INDICATOR: A green LED lights when the 1I0nitor is
switched on with colour displayed on the
normal state. Push Multi-colour switch on the
front to appropriate position for desired
:!< BRI GHTNESS:
* CONTRAST:
f,c 120/240VAC SELECTOR:
* V. SIZE (1 and 2):
* H. PHASE (1 and 2):
i.e POWER INPUT JACK:
~e POWER LEAD:
display.
The brightness control sets the overall or
average intensity
of illumination of the dis-
play
The contrast control sets the intensity of the
data displayed.
The selector switch adapts the monitor for
operation
from the local AC power source.
The vertical size adjustments (mode 1 and mode
2) set the amount of vertical (top to bottom)
raster deflection.
The horizontal phase adjustments (mode 1 and
mode 2) set the horizontal (left to right)
position
of the display within the raster
area.
A3-pin power connector is located on the rear
panel.
A
2m 3-wire mains lead connects power to the
monitor.
::c VIDEO SIGNAL CABLE: A 1. 5m cable, terminated with a 9 Pin D-type
connector, supplies video and sync. signals to
the monitor. The cable is attached to the
monitor and is not detachable. Fig 3-1 illus-
trastes the D-type connector. Table 3-1 lists
the connector signal for each mode of opera-
tion.
~c VIDEO REVERSE SWITCH: Move the switch to reverse the background and
image colours.
3.1
.-

3-2 Set up and Operation:
Perform the following steps to set up and operate the monitor.
1. Place the monitor on a flat surface near the computer and near an AC
power outlet. Be certain that the ventilation slots in the cabinet
are- not blocked or obstruc.ted.
2. Connect the video signal cable from the monitor to the computer.
3. Plug the power cord into the monitor and then into an AC outlet. Be
certain that the 120/240 VAC selector switch on the rear panel is
set to the correct position.
WARNING: Removing the earth from the AC power source aay present a
potentially lethal
shock hazard.
4. Turn on the computer and the monitor. The front panel green LED
should light. The system prompt for the computer should be dis-
played.
5. Adjust the left panel brightness and contrast controls to obtain a
comfortable display.
If your CM-1480 monitor requires service, refer to the controls and
adjustments information of this publication and verify that all controls
and adjustments on the display are correctly set. If your monitor does
require service, it must be returned with the mains lead.
Table 3-1
Pin Ho.
1
2
3
4
5
6
7
8
9
Fig 3-1 9-Pin Colour Monitor
Signal Cable
Description
Mode 1
Mode 2
Shield Gnd.
Ground
Signal Gnd.
r
Red
R
Green
G
Blue
B
Intensity g
Unused
b
Horiz. sync. Horiz.
sync.
Vert. sync. Vert.
sync.
.
3.2
.-
.... ......... -"

4-1
CHAPTER 4
ADJUSTMENTS
This chapter ~ontains instructions for performing the various monitor
adjustments. Because these adjustments are performed while the monitor
is switched on, observe proper precautions to avoid personal injury.
Specific warnings are included where necessary.
Paragraph 4-2 lists the various adjustment devices and their component
numbers. They are arranged according to the circuit board or location
where they can be found. If a particular adjustment does not correct a
problem, refer or section 5 for additional information.
4-2 Monitor Adjustment Devices
DEVICE
R208
R209
R526
R527
R566
R567
R523
R563
R593
R309
R306
R366
R326
R408
R468
R433
R493
R413
R473
R435
R333
R907
R451
):t R813
Focus
G2
EXTERNAL
DESCRIPTION
Left panel brightness control
Left panel contrast control
VIDEO BOARD (PWB-1324)
Primary red drive
Secondary red drive
Primary green drive
Secondary green drive
CRT BOARD (PWB-1337)
Red cut-off
Green cut-off
Blue cut-off
MAIN BOARD (PWB-1337)
POWER SUPPLY
OTHER
VR
VR
Vertical hold
Vertical size, lode I (Rear panel)
Vertical size,
mode 2 (Rear panel)
Vertical centring
Horizontal
hold, mode 1
Horizontal hold, mode 2
Horizontal width, mode 1
Horizontal width. mode 2
HQrizontal phase, lode 1 (Rear panel)
Horizontal phase,
lode 2 (Rear panel)
Horizontal centring
E-W pincus ion
Sub- brightness
22.5kV EHT
B+ 12.8 +/-O.lV
High voltage resistor block
High voltage resistor block
4. ,
.-
.... "'"-."