LG CS990D-EP User manual

COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL: (CS990D-EP)
CHASSIS NO. : CA-84
*( ) ID LABEL Model No.
FACTORY MODEL: CS990D

1. PICTURE TUBE
Size : 19 inch (Flat Square Tube)
DefIection Angle : 90°
Neck Diameter : 29.1mm
Transmission : 52%
Dot Pitch : 0.26mm
Face Treatment : U-Coating
Low Radiation : MPR-II, TCO-99, PFC
2. SIGNAL
2-1. Horizontal & Vertical Sync
1) Input Voltage Level: Low=0~1.2V, High=2.5~5.5V
2) Sync Polarity : Positive or Negative
3) Composite Sync Signal
4) SOG (Sync On Green)
2-2. Video Input Signal
1) Voltage Level : 0 ~ 0.7 Vp-p
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.7 Vp-p
2) Input Impedance : 75 Ω
3) Video Color : R, G, B Analog
4) Signal Format : Refer to the Timing Chart
2-3. Signal Connector
15-pin D-Sub Connector
2-4. Scanning Frequency
Horizontal : 30 ~ 96kHz
Vertical : 50 ~ 160Hz
3. POWER SUPPLY
3-1. Power Range
AC 200~240V , 50Hz, 1.5A Max.
3-2. Power Consumption
4. DISPLAY AREA
4-1. Active Video Area : 365.8 x 274.3mm(13.78" x 10.31")
4-2. Display Color : Full Colors
4-3. Display Resolution : 1600 x 1200 / 75Hz
(Non-Interlace)
4-4. Video Bandwidth : 203 MHz
5. ENVIRONMENT
5-1. Operating Temperature: 0°C ~ 40°C (Ambient)
5-2. Relative Humidity : 8%~ 80%
(Non-condensing)
5-3. Altitude : 5,000m
6. DIMENSIONS (with TILT/SWIVEL)
Width : 458.0 mm (18.03 inch)
Depth : 479.0 mm (18.86 inch)
Height : 468.0 mm (18.43 inch)
7. WEIGHT (with TILT/SWIVEL)
Net Weight : 22.5 kg (49.61 lbs.)
Gross Weight : 27.5 kg (60.64 lbs.)
CONTENTS
- 2 -
SPECIFICATIONS ................................................... 2
SAFETY PRECAUTIONS ........................................ 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
CONTROL LOCATIONS ......................................... 9
WIRING DIAGRAM ............................................... 10
DISASSEMBLY ...................................................... 11
BLOCK DIAGRAM ................................................. 14
DESCRIPTION OF BLOCK DIAGRAM...................15
ADJUSTMENT ...................................................... 17
TROUBLESHOOTING GUIDE .............................. 19
EXPLODED VIEW...................................................27
REPLACEMENT PARTS LIST ............................... 29
PIN CONFIGURATION .......................................... 41
SCHEMATIC DIAGRAM......................................... 46
PRINTED CIRCUIT BOARD................................... 48
MODE
NORMAL (ON)
STAND-BY
SUSPEND
OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
POWER CONSUMPTION
less than 110W
less than 8W
less than 8W
less than 3W
LED COLOR
GREEN
AMBER
AMBER
SPECIFICATIONS

SAFETY-RELATED COMPONENT WARNING!
There are special components used in this color monitor
which are important for safety. These parts are marked
on the schematic diagram and the replacement
parts list. It is essential that these critical parts should be
replaced with the manufacturer's specified parts to
prevent X-radiation, shock, fire, or other hazards. Do not
modify the original design without obtaining written
permission from LG. or you will void the original parts and
labor guarantee.
CAUTION: No modification of any circuit should be
attempted.
Service work should be performed only after
you are thoroughly familiar with all of the
following safety checks and servicing
guidelines.
SAFETY CHECK
Care should be taken while servicing this color monitor
because of the high voltage used in the deflection circuits.
These voltages are exposed in such areas as the
associated flyback and yoke circuits.
FIRE & SHOCK HAZARD
An isolation transformer must be inserted between the
color monitor and AC power line before servicing the
chassis.
• In servicing, attention must be paid to the original lead
dress specially in the high voltage circuit. If a short
circuit is found, replace all parts which have been
overheated as a result of the short circuit.
• All the protective devices must be reinstalled per the
original design.
• Soldering must be inspected for the cold solder joints,
frayed leads, damaged insulation, solder splashes, or
the sharp points. Be sure to remove all foreign
materials.
IMPLOSION PROTECTION
All used display tubes are equipped with an integral
implosion protection system, but care should be taken to
avoid damage and scratching during installation. Use only
same type display tubes.
X-RADIATION
The only potential source of X-radiation is the picture tube.
However, when the high voltage circuitry is operating
properly there is no possibility of an X-radiation problem.
The basic precaution which must be exercised is keep the
high voltage at the factory recommended level; the normal
high voltage is about 26kV. The following steps describe
how to measure the high voltage and how to prevent X-
radiation.
Note : It is important to use an accurate high voltage
meter calibrated periodically.
• To measure the high voltage, use a high impedance
high voltage meter, connect (–) to chassis and (+) to
the CDT anode cap.
• Set the brightness control to maximum point at full
white pattern.
• Measure the high voltage. The high voltage meter
should be indicated at the factory recommended level.
• If the meter indication exceeds the maximum level,
immediate service is required to prevent the possibility
of premature component failure.
• To prevent X-radiation possibility, it is essential to use
the specified picture tube.
CAUTION:
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.
SAFETY PRECAUTIONS
- 3 -

- 4 -
TIMING CHART
VIDEO
SYNC D
A
EF
BC
kHz
µs
µs
µs
µs
µs
µs
Hz
ms
ms
ms
ms
ms
ms
MODE 1
–
43.269
23.112
17.778
5.334
1.556
1.556
2.222
–
85.008
11.763
11.093
0.670
0.023
0.069
0.578
640
X
480
85Hz
Yes
MODE 2
+
53.674
18.631
14.222
4.409
0.569
1.138
2.702
+
85.061
11.756
11.178
0.578
0.019
0.056
0.503
800
X
600
85Hz
Yes
MODE 3
+
68.677
14.561
10.836
3.725
0.508
1.016
2.201
+
84.997
11.765
11.183
0.582
0.015
0.044
0.523
1024
X
768
85Hz
Yes
MODE 4
+
91.146
10.971
8.127
2.844
0.406
1.016
1.422
+
85.024
11.762
11.235
0.527
0.011
0.033
0.483
1280
X
1024
85Hz
Yes
MODE 5
+
93.750
10.666
7.901
2.765
0.316
0.948
1.501
+
75.000
13.333
12.800
0.533
0.011
0.032
0.490
1600
X
1200
75Hz
Yes
MARK
A
B
C
D
E
F
A
B
C
D
E
F
VESA
MODE
FACTORY PRESET MODE
Resolution
Recall
H
O
R
I
Z
O
N
T
A
L
V
E
R
T
I
C
A
L
Sync Polarity
Frequency
Total Period
Video Active Time
Blanking Time
Front Porch
Sync Duration
Back Porch
Sync Polarity
Frequency
Total Period
Video Active Time
Blanking Time
Front Porch
Sync Duration
Back Porch

- 5 -
OPERATING INSTRUCTIONS
FRONT VIEW REAR VIEW
Front Control Panel
AC Power Socket D-Sub Signal Connector
ID Label
Power (DPMS) Indicator
See Front Control Panel
Power ON/OFF Button
ENTER Button
OSD Select/Adjustment
EXIT Button
Brightness Contrast
Power Indicator
Power Button
1. Power ON/OFF Button
This button is used to turn the monitor ON and OFF.
2. Power Indicator
This Indicator lights up green when the monitor
operates normally. If the monitor is in DPM (Energy
Saving) mode (stand-by/suspend/off), this indicator
color changes to amber.
3. Button
Use this button to enter or exit the on screen display.
4. Contrast Control
To adjust the display to the contrast desired.
5. Brightness Control
To adjust the brightness of the screen.
6. OSD Select/Adjustment
Use these buttons to choose or adjust items in the on
screen display.
7. Exit Button
To disappear OSD on the screen.

- 6 -
On-Screen-Display (OSD) Control
To adjust an image size, position, and operating
parameters are quick and easy with the On-Screen-Display
control system, using the ENTER ( ) button and the OSD
Select/Adjustment
( ) button. A quick example is given
below to familiarize yourself with use of the controls.
Example;
Note: Allow the monitor to stabilize for at least 30 minutes
before making image adjustment.
To make adjustments in the On Screen Display, follow
these steps:
1.
Press the Button, then the main menu of the OSD
appears.
2. To acces a control, use the or Buttons.
When the icon you want becomes highlighted,
press the Button.
3. Use the Buttons to adjust the item to the desired
level.
4. Accept the changes by pressing the Button.
5.Exit the OSD by Pressing the Button.
Listed below are icons, icon names, and icon descriptions
of the OSD menu.
H POSITION
To move picture image left and right.
H SIZE
To adjust image width.
43.2kHz/85Hz
H POSITION
50
U
43.2kHz/85Hz
H SIZE
50
U
V POSITION
To move image up and down.
43.2kHz/85Hz
V POSITION
50
U
V SIZE
To adjust image height.
43.2kHz/85Hz
V SIZE
50
U
PINCUSHION
To correct the bowing in and out of the image.
43.2kHz/85Hz
PINCUSHION
50
U

- 7 -
TRAPEZOID
To correct geometric distortion.
PIN BALANCE
To correct the balance of both sides bowing.
PARALLELOGRAM
This control adjusts for a skewing of the screen
image.
TILT
To correct image rotation.
H MOIRE
Reduce horizontal moire when interference patterns
of dark steady wary lines appear on your screen.
The moire adjustments may affect the focus of the
screen.
43.2kHz/85Hz
TRAPEZOID
50
U
43.2kHz/85Hz
PIN BALANCE
50
U
V MOIRE
Reduce vertical moire when interference patterns of
dark steady wary lines appear on your screen.
The moire adjustments may affect the focus of the
screen.
H CONVERGENCE
This item allows you to adjust the horizontal
convergence.
The horizontal convergence control adjust the
alignment of the red and blue horizontal fields.
43.2kHz/85Hz
V MOIRE
0
U
43.2kHz/85Hz
H CONVERGENCE
50
U
COLOR
•9300 : To appear the display’s color
temperature. Slightly bluish white.
•6500 : To appear the display’s color
temperature.
Slightly reddish white.
•: Temperature range is from 5000K to
10000K. So, user easily color set without
adjustment Red, Green and Blue (R/G/B).
•: To set your own color levels.
Allow for specific adjustments to Red,
Green and Blue (R/G/B).
•: To exit the COLOR OSD.
43.2kHz/85Hz
COLOR
U
43.2kHz/85Hz
COLOR
9300 6500 R G B
K
43.2kHz/85Hz
PARALLELOGRAM
50
U
43.2kHz/85Hz
TILT
50
U
43.2kHz/85Hz
H MOIRE
0
U
K
R G B

- 8 -
RECALL
LANGUAGE
You can use this function when you want to go back
to the screen display of the time you purchased the
product after adjusting to modify it in the Preset
Mode.
When you are in the User mode, you can recall only
, , , , items. After using Recall, adjust the
screen display again if necessary.
43.2kHz/85Hz
RECALL
U
43.2kHz/85Hz
LANGUAGE
U
43.2Hz/85Hz
VIDEO LEVEL
0.7V 1.0V
U
43.2kHz/85Hz
LANGUAGE
ENGLISH
DEUTSCH
FRANÇAIS
ESPAÑOL
ITALIANO
To choose the language in which the control names
are displayed.
OSD Menus are available in 8 languages : English,
German, French, Spanish, Italian, Svenska, Suomi
and Português.
VIDEO LEVEL
This item is used to select the monitor's input signal
level. The normal level used for most PC's is 0.7V.
When the screen suddenly gets brightened or blurry,
please select 1.0V and try again.
DEGAUSS
To manually demagnetize the screen which may
show some image or color incorrectly.
43.2kHz/85Hz
DEGAUSS
U
INFORMATION
To inform users of preset and user mode data.
43.2kHz/85Hz
INFORMATION
U
43.2kHz/85Hz
INFORMATION
PRESET MODE
1 43.2kHz / 85Hz
2 53.6kHz / 85Hz
3 68.6kHz / 85Hz
4 91.1kHz / 85Hz
5 93.7kHz / 75Hz

CONTROL LOCATIONS
- 9 -
3
4
56
7
CONTROL 2
MAIN
8
9
1
No.
1
2
3
4
5
No.
6
7
8
9
Ref. No.
SW201
VR202
VR201
SW205
SW204
Ref. No.
SW202
SW203
VR901
VR701
Control Function
POWER BUTTON
CONTRAST ADJUSTMENT
BRIGHTNESS ADJUSTMENT
OSD SELECT/ADJUSTMENT RIGHT
OSD SELECT/ADJUSTMENT LEFT
Control Function
OSD BUTTON
OSD EXIT BUTTON
B+ADJUSTMENT
HIGH-VOLTAGE ADJUSTMENT

WIRING DIAGRAM
- 10 -
P701
P901
WG1
P303
P308
P302
P301 P305
P304
P402
P201
P902
P801
P702
P401
Degaussing
Coil
CDT Earth
DY-Pin
DYAssembly Screw
Anode Cap
P702-1
P202
P203

- 11 -
DISASSEMBLY
3. TOP SHIELD REMOVAL
1) Remove eight screws (a).
(a)
(a)
(b)
(b)
2. BACK COVER REMOVAL
1) Remove two screw caps (a).
2) Remove four screws (b).
3) Slide the Back Cover away from the Front
Cabinet of the monitor.
(a)
(b)
1. TILT/SWIVEL REMOVAL
1) Set the monitor face downward.
2) Remove two screws (a).
3) Pressing the latch (b), carefully remove
the Tilt/Swivel by pulling it upward.
(a)
(a)
(a)
(a)
(a)
(a)
(a)
(a)

- 12 -
Anode Cap
P304
P201
(Control PCB)
P402
Degaussing
Coil
CDT Earth
DY-Pin
(to P303)
(to P304)
P303
Pin (c)
(a)
(a)
(a)
(a)
(b)
(b)
DYAssembly Screw
P801
P901
P702-1
P701
4. TOTAL CHASSIS ASSEMBLY REMOVAL
1) Disconnect P901 (Degaussing pin), P701 (DY pin) and P402, P801 from the Main PCB.
2) Disconnect CDT Earth Pin, P303, P304 from the Video PCB.
3) Disconnect Pin (c) from the DY Assembly screw.
4) Carefully separate the CDT Board Assembly from the CDT neck.
5) Discharge the remaining static electricity by shorting between the Anode Cap and the CDT ground.
6) Disconnect the Anode Cap from the CDT.
7) Remove four screws (a).
8) Remove two screws (b).
9) Remove the Front Cabinet and the CDT set from the Main Total Assembly.
10) Disconnect P301, P302 and P308, P305 from the Video PCB.
11) Remove the Video Ass’y from the Main Total Ass’y.

- 13 -
5. CONTROL PCB ASSEMBLY REMOVAL
1) Remove three screws (a).
2) Remove the Control PCB Assembly
from the Front Cabinet.
(a)
6. BOTTOM BRACKET REMOVAL
1) Remove two screws (a).
2) Remove two screws (b).
3) Remove screw (c) and Metal Fix.
4) Remove the Bottom Bracket.
(a)
(a)
(c)
(b)
(b)

- 14 -
BLOCK DIAGRAM
POWER INPUT
200~240VAC WITH PFC
Line Filter
Degaussing Circuit
< OSD Control >
SMPS
TRANS
(T901)
SMPS CONTROL (IC901)
DPM
CONTROL
CIRCUIT
190V
25V
-12V
-12V 125V 80V 15V 12V 6.3V 5V
TILT
Control Circuit
6.3V
12V
E2PROM (IC402)
H / V POSITION H / V SIZE SPCC TRAPIZODE PIN BALANCE PARALLELOGRAM TILT RECALL DEGAUSS COLOR CONTROL MOIRE LANGUAGE INFORMATION VIDEO LEVEL OSD POSITION
5V
OSD IC (IC301)
H-Sync Sig V-Sync Sig I2C DATA(SDA) I2C CLOCK(SCL)
VIDEO PRE-AMP (IC302)
Signal
Cable R
G
BVIDEO
MAIN AMP (IC303)
12V
5V CUT OFF
CONTROL
125V
80V
5V
H/V Sync Processor
( IC701 )
TDA4856 V-OUT
( IC601)
TDA8172
H-OUT
( Q708)
H-Linearity
Correction
DC/DC Converter
X-RAY
Protection
Circuit
FBT
( T701 )
Dynamic
Focus
Circuit
Auto Beam Limit
Vertical Blanking,
Brightness Control
-120V
30V
700V
H.V
CONTROL
DUMMY
TRANS
12V
25V
MICOM (IC401)
SCL / SDA
H/V Sync,
PWM Control
Sig 12V
15V-12V
190V
DY CDT
Heater ( 6.3V )
I2C
I2C
I2C
H/V
Sync
G1
Screen
Dynamic Focus
Static Focus
H.V
R/G/B
Bias
R/G/B
Contrast
H-DRV
B-DRV
12V
TILT
COIL
DEGAUSSING
COIL
I2C
VOLTAGE
FEEDBACK
PFC

DESCRIPTION OF BLOCK DIAGRAM
1. Line Filter & Associated Circuit.
This is used for suppressing noise of power input line
flowing into the monitor and/or some noise generated
in this monitor flowing out through the power input line.
That is to say, this circuit prevents interference
between the monitor and other electric appliances.
2. Degauss Circuit & Coil.
The degauss circuit consists of the degaussing coil,
the PTC (Positive Temperature Coefficient) thermistor
(TH901), and the relay (RL901). This circuit eliminates
abnormal color of the screen automatically by
degaussing the slot mask in the CDT when turn on the
power switch.
When you need to degauss while using the monitor,
select DEGAUSS on the OSD menu.
3. SMPS (Switching Mode Power Supply).
This circuit works with power of 200~240V (50Hz).
The operation procedure is as follows:
1) AC input voltage is rectified and smoothed by
the bridge diode (D901) and the capacitor (C907).
2) The rectified voltage (DC voltage) is applied to the
primary coil of the transformer (T901).
3) The control IC (IC901) generates switching pulse to
turn on and off the primary coil of the transformer
(T901) repeatedly.
4) Depending on the turn ratio of the transformer, the
secondary voltages appear at the secondary coil of
the transformer (T901).
5) These secondary voltages are rectified by each
diode (D906, D907, D908, D909, D910, D911,
D912, D913) and operate the other circuits.
(Deflection, Video Amplifier, etc.)
4. Display Power Management Circuit.
This circuit control power consumption of the monitor
by detecting H and V sync signal. There are stand-by
and suspend mode. When no horizontal or vertical
sync signal input, the circuit consists of Q930 and
Q907 becomes stand-by and suspend mode. It’s
power consumption is below 8W. When no horizontal
and vertical sync signal input, it’s power consumption
is below 3W.
5. X-ray Protection.
This circuit detects the rectified DC voltage comes
from the FBT pin 4. If the high voltage of the FBT
reaches up to about 30kV (abnormal state),
Micom(IC401) detects. It stops B+voltage supplied to
the FBT (T701), and high voltage is not be generated,
(In the normal state, the high voltage is about 26kV.)
6. Micom(Microprocessor) Circuit.
The operating procedure of Micom (Microprocessor)
and its associated circuit is as follows:
1) H and V sync signal is supplied from Signal Cable to the
Micom (IC401).
2) The Micom (IC401) distinguishes polarity and
frequency of HandV sync.
3) The Micom controls each OSD function signals.
(H-size, H-position, V-size, etc.)
4) The controlled data of each mode is stored in IC402.
User can adjust screen condition by each OSD
function. The data of the adjust screen condition is
stored automatically.
7. Horizontal and Vertical Synchronous Processor.
This circuit generates the horizontal drive pulse and
the vertical drive pulse by taking sync-signal from
Signal Cable. This circuit consists of the
TDA4856(IC701) and the associated circuit.
8. Oscillating Circuit for D/D Converter.
This circuit generates the pulse wave which has the
horizontal period by taking the output of the TDA4856
(IC701).
9. D/D (DC to DC) Converter.
This circuit supplies DC voltage to the horizontal
deflection output circuit by decreasing DC 190V which
is the secondary voltage of the SMPS in accordance
with the input horizontal sync signal.
10. Side-Pincushion Correcting Cirucit.
This circuit improves the Side-pincushion of the screen
by mixing east-west wave to the output of the
horizontal deflection D/D converter which is used for
the supply voltage source (B+) of the deflection circuit.
- 15 -

- 16 -
11. D/D Drive & Convert Circuit.
This circuit is used for supplying B+voltage to
horizontal deflection output transistor (Q709). This
circuit makes to add side-pincushion correcting signal
to B+voltage.
12. Horizontal Deflection Output Circuit.
This circuit makes the horizontal deflection by
supplying the saw-tooth current to the horizontal
deflection yoke.
13. High Voltage Output & FBT (Flyback Transformer).
The high voltage output circuit is used for generating
pulse wave to the primary coil of the FBT (Flyback
Transformer (T701)). A boosted voltage (about 26kV)
appears at the secondary of the FBT and it is supplied
to the anode of the CDT.
And there are another output voltages such as the
dynamic focus voltage.
14. H-Linearity Correction Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
15. Vertical Output Circuit.
This circuit takes the vertical wave from the TDA4856
(IC701) and performs the vertical deflection by
supplying the saw-tooth wave current from the
TDA8172 (IC601) to the vertical deflection yoke.
17. Dynamic Focus Output Circuit.
This circuit takes H and V parabola wave from the
TDA4856 (IC701), and amplifies these waves to offer
to the FBT (T701).
18. H & V Blanking and Brightness Control.
This circuit eliminates the retrace line by supplying a
negative pulse to the G1 of the CDT. The brightness
control circuit is used to control of the screen
brightness by changing the DC level of G1.
19. Image Rotation (Tilt) Circuit.
This circuit corrects the tilt of the screen by supplying
the image rotation signal to the tilt coil which is
attached to the CDT near the deflection.
20. Static Convergence Control Circuit.
This circuit corrects the convergence of the screen by
supplying the convergence signal to the 4H (STC) coil
which is attached to the CDT near the deflection.
21. Moire Reduction Circuit
This circuit reduce interference between the periodical
display pattern and the CDT's slot (or dot).
The positions of every other one dot video signal
beams (red, green, and blue beam) are shifted finely,
thus reducing interference.
22. OSD Circuit.
This circuit is used for performing the OSD (On-
Screen- Display) function.
When a user selects the OSD Select/Adjustment
control, the adjustment status displays on the screen.
23. Video Pre-Amp Circuit.
This circuit amplifies the analog video signal from 0-
0.7V to 0-4V. This circuit is operated by taking the
clamp, R, G, B drives, and contrast signals from the
Micom (IC401).
24. Video Output Amp Circuit.
This circuit amplifies the video signal which comes
from the video pre-amp circuit and amplified video
signal is applied to the CDT cathode.

- 17 -
ADJUSTMENT
GENERAL INFORMATION
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required.
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes.
•Alignment appliances and tools.
- IBM compatible PC.
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- EPROM or EEPROM with saved each mode data.
- Alignment Adaptor and Software.
- Digital Voltmeter.
- White Balance Meter.
- Luminance Meter.
- High-voltage Meter.
AUTOMATIC AND MANUAL DEGAUSSING
The degaussing coil is mounted around the CDT so that
automatic degaussing when turn on the monitor. But a
monitor is moved or faced in a different direction, become
poor color purity cause of CDT magnetized, then press
(DEGAUSSING) on the OSD menu.
ADJUSTMENT PROCEDURE & METHOD
-Install the cable for adjustment such as Figure 1and run
the alignment program on the DOS for IBM compatible PC.
-Set external Brightness and Contrast volume to max position.
1. Adjustment for B+ Voltage.
1) Display cross hatch pattern at Mode 4.
2) Adjust C913 (+) voltage to 190V ± 0.5V with VR901.
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 4.
2) Adjust CDT Anode voltage to 26kV ± 0.2kV with
VR701.
3. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 1~5.
2) Run alignment program for CS990D on the IBM
compatible PC.
3) EEPROM → ALL CLEAR → Y(Yes) command.
<Caution> Do not run this procedure unless the
EEPROM is changed. All data in EEPROM (mode
data and color data) will be erased.
4) COMMAND → PRESET START → Y(Yes) command.
5) DIST. ADJ. → FOS. ADJ command.
6) Adjust H-POSITION as arrow keys to center of the
screen.
7) Adjust H-SIZE as arrow keys to 350 ± 2mm.
8) Adjust V-POSITION as arrow keys to center of the
screen.
9) Adjust V-SIZE as arrow keys to 262 ± 2mm.
10) Adjust SIDE-PIN(Side-Pincushion) as arrow keys to
be the best condition.
11) Adjust TRAPEZOID as arrow keys to be the best
condition.
12) Adjust TILT as arrow keys to be the best condition.
13) Display cross hatch pattern at Mode 4.
14) DIST. ADJ. → BALANCE DATA command.
15) Adjust balance of PIN-BALANCE as arrow keys to
be the best condition.
16) Adjust parallelogram as arrow keys to be the best
condition.
17) Save of the Mode.
18) Save of the System.
19)Display from Mode 4 and repeat above from
number 5) to 17).
20) COMMAND → PRESET EXIT → Y (Yes) command.
5. Adjustment for White Balance and Luminance.
1) Set the White Balance Meter.
2) Press the (DEGAUSSING) on the OSD menu for
demagnetization of the CDT.
3) Display color 0,0 pattern at Mode 4.
4) COLOR ADJ. → LUMINANCE command of the
alignment program.
5) Set OSD Bightness and Contrast data to max data.
6) COLOR ADJ. → BIAS ADJ. command of the
alignment program.
7) Check whether blue color or not at R-BIAS and G-
BIAS to min position, B-BIAS to 150 (decimal)
position and Sub-Bightness to155(decimal) position.
If it's not blue color, the monitor must repair.
8) Adjust Screen control on the FBT to 0.1 ± 0.02FL of
the raster luminance.
9) Adjust R-BIAS and G-BIAS command to x=0.283 ±
0.006 and y=0.298 ± 0.006 on the White Balance
Meter with PC arrow keys.
10)Adjust SUB-Brightness command to 0.4 ± 0.05FL of
the raster luminance.
11) Display color 15,0 box pattern(70x70mm) at mode 4.
12)Set Brightness and Contrast to max.
13)DRIVE ADJ command.
14)Set B-DRIVE to 150(decimal) at DRIVE of the
alignment program.
15)Adjust R-DRIVE and G-DRIVE command to white
balance x=0.283 ± 0.003 and y=0.298 ± 0.003 on
the White Balance Meter with PC arrow keys.

- 18 -
Figure 1. Cable Connection
220
IBM
Compatible PC
Monitor to be
adjusted
Video Signal
Generator
Parallel Port
Power inlet (required)
Power LED
ST Switch
Power Select Switch
(110V/220V)
Control Line
Not used
RS232C
PARALLEL
V-SYNC POWER
ST
VGS MONITOR
E
E
V-Sync On/Off Switch
(Switch must be ON.)
F
F
A
A
B
B
C
C
1510
5
569
1
1
1
14
13
25
6
5V
5V
5V
4.7K
4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
16)Adjust SUB-CONTRAST command to 47 ± 1FL of
the color 15,0 window pattern (70x70mm)
luminance at Mode 4.
17)Display color 15,0 full white patten at Mode 4.
18) Set the Brightness and Contrast to max.
19)COLOR ADJ. → LUMINANCE → ABL command.
20) Adjust ABL to 32 ± 1FL of the luminance.
21) Exit from the program.
6. Adjustment for Focus.
1) Display H character in full screen at Mode 4.
2) Adjust two Focus control on the FBT that focus
should be the best condition.

- 19 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
TROUBLE IN
IC901
TROUBLE IN
FUSE (F901)
TROUBLE IN
D902, D903, D904
CHECK
FUSE OK?
CHECK
C907 (+) VOLTAGE?
(310VDC)
NO
YES
YES
NO
NO
CHECK
D902, D903, D904
VOLTAGE?

- 20 -
2. NO CHARACTER
CHECK
IC302 PIN 3, 8,12 (12V),
PIN 17 (5V)?
CHECK
IC302 PIN 2, 6,11 ?
CHECK
IC302 PIN 29, 32, 35 ?
TROUBLE IN
P302,
5V, 12V LINE
TROUBLE IN
PC SIGNAL,
SIGNAL CABLE
TROUBLE IN
IC302
TROUBLE IN
CDT SOCKET
NO
YES
NO
NO
YES
YES
CHECK
R, G, B CATHODE
VOLTAGE?
TROUBLE IN
IC303
NO
YES
NO CHARACTER