FS 740 Compaq FS740

User Manual: FS 740

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SPECIFICATIONS
1. PICTURE TUBE
Size
DefIection Angle
Neck Diameter
Dot Pitch
Diagonal Inch
Internal

: 17 inch (ez Flat)
: 90°
: 29.1mm
: 0.25mm
: 16.06”
: Anti-Glare

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
2-2. Video Input Signal
1) Voltage Level
a) Color 0, 0
b) Color 7, 0
c) Color 15, 0
2) Input Impedance
3) Video Color
4) Signal Format

: 0 ~ 0.7 Vp-p
: 0 Vp-p
: 0.467 Vp-p
: 0.7 Vp-p
: 75Ω
: R, G, B Analog
: Refer to the Timing Chart

2-3. Signal Connector
15-pin Attached Connector
2-4. Scanning Frequency
Horizontal
Vertical

: 30 ~ 70 kHz
: 50 ~ 120 Hz

3. POWER SUPPLY
3-1. Power Range
AC 100~240V, 50/60Hz, 2.0A

3-2. Power Consumption
MODE

H/V SYNC

POWER CONSUMPTION

LED COLOR

NORMAL (ON)

ON/ON

less than 100W

GREEN

OFF

OFF/OFF

less than 5W

AMBER

4. DISPLAY AREA
4-1. Active Video Area
• Max Image Size - 325.4 x 244.1mm(12.81" x 9.61")
• Preset Image Size - 306 x 230 mm (12.04" x 9.06")
4-2. Display Color
: Full Colors
4-3. Display Resolution : 1280 x 1024 / 60Hz
(Non-Interlace)
4-4. Video Bandwidth : 110MHz
5. ENVIRONMENT
5-1. Operating Temperature: 10°C ~ 40°C (Ambient)
5-2. Relative Humidity
: 10% ~ 90%
(Non-condensing)
5-3. Altitude
: 3658m
6. DIMENSIONS (with TILT/SWIVEL)
Width
: 416 mm (16.38 inch)
Depth
: 455 mm (17.91 inch)
Height
: 449 mm (17.68 inch)
7. WEIGHT (with TILT/SWIVEL)
Net Weight
: 19.0 kg (41.91 lbs.)
Gross Weight
: 24.0 kg (52.94 lbs.)

EXPLODED VIEW

3
EXPLODED VIEW PARTS LIST

17

5

B
A
8

9
6
2

20
19
16
7

4

12
10

13

15

18

21
12
14

1

22

11

15

C

Ref. No.

Part No.

1

3091TKC068B

CABINET ASSEMBLY, EQ770F COMPAQ 3090TKC064A LGESP,LOCAL

2

2423GC4E98A

CDT SET, M41QEE903X 01RLAD

3

3809TKC039B

BACK COVER ASSEMBLY, EQ770F 3808TKC038A LGESP,LOCAL

4

3043TKK083B

TILT SWIVEL ASSEMBLY, EQ770F T059,B053,K024 LGESP,LOCAL

5

339-002K

6

6140TC3004A

COIL,DEGAUSSING, 1410MM 16.0OHM 0.5MM 130T 17" WITH EARTH

7

6871TST247B

PWB(PCB) ASSEMBLY,SUB, EQ770F CONTROL TOTAL COMPAQ CA-90

8

6174Z-1048A

FBT (FLY BACK TRANSFORMER), FMMTC91 AM1048A (LIM SANG IL) T701

9

6200TJB001K

FILTER(CIRC), EMC 02MD4P DELTA BK CG773F

10

4810TKK176A

BRACKET, EQ770F SUPPORTER CDT(LEFT,COMPAQ17")

11

4810TKK177A

BRACKET, EQ770F SUPPORTER CDT(RIGHT,COMPAQ17")

12

4930TKK031C

HOLDER, PCB FIX , PC+ABS

13

4950TKS185B

METAL, SHIELD BOTTOM(COMPAQ,CKD,LGESP)

14

4810TKK175A

BRACKET, CQ550F HOLDER ,PCB

15

332-102F

16

6866TA9025J

17

332-122C

18

6401TZZ022A

SPEAKER ASSEMBLY, CQ550F/EQ770F COMPAQ(231112-001) SPK ASSY(L/R)

19

6513TCA002A

MICRO PHONE ASSEMBLY, CQ550F/EQ770F MWM DM1530-PD1 WITH CORE

20

4950TKK334A

METAL, FIX (MICROPHONE, COMPAQ)

21

6852TAZ006E

CORD,A/V, AUDIO UL 2851 #28-2C 1500MM QUARTZ KSDPWB (MICRO-PHONE CABLE)

22

6852TDZ002A

CORD,LINE, DH-20100D KSD 1000 QUARTZ COMPAQ (12V DC CABLE)

A

6871TMT256B

PWB(PCB) ASSEMBLY,MAIN, EQ770F KQCQMS COMPAQ CA-90 TOTAL

B

6871TVT241B

PWB(PCB) ASSEMBLY,VIDEO, EQ770F VIDEO TOTAL COMPAQ CA-90

C

3313T17239B

MAIN TOTAL ASSEMBLY, EQ770F COMPAQ CA-90

Description

SCREW ASSEMBLY, TAPTITE P TYPE D5.0 L25.0 MSWR/FZMY

SCREW, PTP+4*20BP(MSWR/FZMY)
CABLE,D-SUB UL 2990-9C(7.5) AT 1560MM COMPAQ EQ770F DM
SCREW, TP1+M4*16(FZMW1)

P501

AC
Socket

S

MIC

P405

T1

Signal
Cable

P301

WIRING DIAGRAM

P702

P402

P205

S+

P902

P202

P302

G2

-8-

FBT

P701

P703

TIMING CHART

VIDEO
B

A

E

C
D

SYNC

F

<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
Mode

1
2
3
4
5
6
7
8
9
10
11
12

H/V
Sort

Sync
Polarity

Frequency

H

+

31.468

31.778

25.418

6.360

3.823

Total Period Video Active
Time (A)
(E)

Blanking Time
(B)

Sync Duration
(D)

Front Porch
(C)

Resolution

1.909

0.638

640x350
70Hz

Back Porch
(F)

V

–

70.090

14.268

11.122

3.147

0.064

1.111

0.381

H

–

31.469

31.778

25.422

6.356

3.813

1.907

0.636

V

–

59.940

16.683

15.253

1.430

0.064

1.048

0.318

H

–

43.269

23.112

17.778

5.334

1.556

2.222

1.556

V
H

–
–

85.008
31.470

11.764
31.780

11.093
25.420

0.670
6.360

0.069
3.810

0.578
1.910

0.023
0.640

V

+

70.080

14.270

12.710

1.557

0.064

1.080

0.413

H

+

37.879

26.400

20.000

6.400

3.200

2.200

1.000

V

+

60.316

16.579

15.840

0.793

0.106

0.607

0.026

H

+

46.880

21.330

16.160

5.170

1.620

3.230

0.320

V

+

75.010

13.331

12.798

0.533

0.064

0.448

0.021

H

+

53.674

18.631

14.222

4.409

1.138

2.702

0.569

V

+

85.061

11.756

11.179

0.578

0.056

0.503

0.019

H

–

48.363

20.677

15.754

4.923

2.092

2.462

0.369

V
H

–
+

60.004
60.023

16.666
16.660

15.880
13.003

0.786
3.657

0.124
1.219

0.600
2.235

0.062
0.203

V

+

75.029

13.328

12.795

0.533

0.050

0.466

0.017

H

+

68.677

14.561

10.836

3.725

1.016

2.201

0.508

V

+

84.997

11.765

11.183

0.582

0.044

0.524

0.015

H

+

67.500

14.815

10.667

4.148

1.185

2.370

0.593

V

+

75.000

13.333

12.800

0.533

0.044

0.474

0.015

H

+

63.98

15.63

11.85

3.78

1.04

2.30

0.44

V

+

60.02

16.661

16.005

0.656

0.047

0.594

0.015

-4-

640x480
60Hz
640x480
85Hz
720x400
70Hz
800x600
60Hz
800x600
75Hz
800x600
85Hz
1024x768
60Hz
1024x768
75Hz
1024x768
85Hz
1152x864
75Hz
1280x1024
60Hz

[ OS D Con trol ]

12V

H.V

80V
Heater ( 6. 3V )

Input
Signal

H-Sync.
V-Sync
I 2C DA TA (SDA)
I 2C

R
G
B

VIDEO
Pre Amp
(IC302)

CLOCK(SCL)

VIDEO
Main A mp
(IC303)

DY

5V

CDT

G2 G1

MICOM
(IC401)

5V

80V

I2 C

I2 C

CUT OFF Circuit
(IC304)

R/G/B
Contrast

Static Focus

OSD IC
(IC301)

R/G/B
Bias

5V

12V
SCL / SDA

PC
E2PROM
(IC402)

Microphone

Speaker

H/V Sync S ignal
PWM Control Signal

X-RA Y
Protection
Circuit

12V

Vertical Blanki ng
Bri ghtness Control
Circuit

12V
Jack
I2 C

6.3V

Degaussing
Circuit

H/V Sync
Signal

15V

15V

Main
Trans
(T901)

Degaus sing
Coil
Line
Filter

Input Voltage
90~264VA C
(50/60Hz)

Vertical Output
( IC601)
TDA4 866J

- 150V
40V

FBT
( T701 )

80V
50V
H Drive

H Deflection
( Q706)
B+

15V

15V
H-Linearity
Circuit

6.3V

Voltage
feedback

- 12 -

TILT
Control
Circuit

TILT
Coil

15V

H/V Sync P rocessor
( IC701 )
TDA4 841

400V

Voltage
feedback
DC/DC Converter

Main
Power
Control
(IC901)

B-Drive

Sub
Trans
(T902)
Voltage
feedback

15V

Dynamic
FOCUS Cir cuit

Auto Beam
Limit Circuit

50V

D/D
Feed Back

12V
Sub
Power
Control

BLOCK DIAGRAM

Jack

I2 C

5.0V

Energy Saving
Control Circuit

Regulation
Circuit

Dynamic Focus

CONTRA ST
BRIGHTNESS
H / V POSITION
H / V SIZE
SPCC
TRAP EZOID
PIN B ALA NCE
PA RA LLELOGRA M
ROTA TION
DEGA USS
Color Temp
RECA LL
Exit

DESCRIPTION OF BLOCK DIAGRAM
1. SMPS(Switching Mode Power Supply)
When you turn on the power switch, the operating
procedure is as follows:
1) The AC line voltage is rectified by the bridge diodes D900
and C908.
2) The control IC(IC901, IC902) starts switching and
generates switching pulses in the primary turns of the
SMPS transformer (T901, T902).
3) The switching pulses of the primary turns induce the
secondary pulse of the transformer by the turn ratio.
These pulses are rectified by each diode (D971, D961,
D962, D951, D941, D922 and D923).
4) Each rectified DC voltage (80V, 50V, 15V, 12V, 6.3V and
5V) is supplied to the main circuit.

8. Horizontal linearity Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.

2. Over Voltage Protection Circuit
When the input voltage of IC901 Vin(pin 7) is more than
Spec Voltage , all the secondary voltages of the SMPS
transformer (T901) down to low value.

12. Blanking and Brightness Control Circuit.
Blanking circuit eliminates the retrace line by supplying a
negative pulse wave to the G1 of the CDT. Brightness
control circuit is used for control of the screen brightness
by changing the DC level of the G1.

3. Display Power Management Circuit
1) OFF mode
When no input of horizontal and vertical sync, Q903 is
turned on and all the secondary voltages of the SMPS
transformer (T901) down to low value. Then input power
consumption is below 5 watts.

13. Video Processor Circuit.
Video processor circuit consists of the video drive output
block. The video drive IC(IC302) receives the video signal
from PC. The gain of each channel is controlled by the
voltage of contrast pin. The cut-off circuit compensate
different voltage of each channel between the cathode
and the G1 of the CDT.

4. X-ray Protection Circuit
If the high voltage of the FBT reaches up to 29KV IN an
abnormal case, Q807 operates and IC401 pin 41 came to
low level, then IC401 control IC701 to stop Horizontal
drive pulse and stop Horizontal deflection.
5. Microprocessor Control Circuit.
1) Horizontal and Vertical sync signals are supplied to the
microprocessor (IC401).
2) Microprocessor(IC401) discriminates the operating mode
from the sync. polarity and resolution.
3) After microprocessor reads these adjusted mode data
stored at EEPROM, it controls operating mode data
through IIC.
4) Users can control screen condition by the Select,
Backward, Forward buttons.
6. D/D Convert Circuit.
To obtain constant high voltage, this circuit supplies
controlled DC voltage for FBT and Horizontal deflection
circuit according to the horizontal sync frequency.

9. Horizontal drive and Output Circuit.
This circuit is a horizontal deflection amplifier for raster scan.
10. ABL Circuit.
This circuit limits the beam-current for the reliability of the CDT.
11. Vertical Output Circuit.
This circuit takes the vertical ramp wave from the
TDA4866J(IC601) and performs the vertical deflection by
supplying the saw-tooth wave current to the vertical
deflection yoke.

14. OSD (On-Screen-Display) Circuit.
This circuit displays on the screen information of the
monitor’s status.
15. Dynamic Focus Output Circuit.
This circuit takes the vertical parabola waves from the
TDA4841(IC701) and amplifies it to maintain constant
focus on center and corners in the screen.
16. 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 near
the deflection yoke of the CRT.
17. Speaker
Speakers are attached the monitor sides.
DC power voltage(12V) is supplied to speakers.
18. Microphone
Microphone attached top of the monitor is commected to
PC.

7. Horizontal and Vertical Sync Processor Circuit.
The horizontal and vertical sync processor IC (IC701) has
a sync detector, a saw-tooth generator, and drive function.
So output horizontal and vertical drive signal control
screen distortions.

- 13 -

CONTROL LOCATIONS

VR901: B+ Adjustment
(50V Line)

-7-

80V

0V
1H-Freq.

4.5V

0V
1H-Freq.

45V

10V

V-Freq.

8.7V

0V
1H-Freq.

1200V
300V

37V

0V

0V
1H-Freq.

730V
600V

V-Freq.

200V
45V
0V

ADJUSTMENT
GENERAL INFORMATION
7) Adjust tilt as arrow keys to be the best condition.
8) DIST. ADJ. → BALANCE command.
9) Adjust parallelogram as arrow keys to be the best
condition.
10) Adjust balance of pin-balance as arrow keys to be
the best condition.
11) DIST. ADJ. → FOS. ADJ command.
12) Adjust V-SIZE as arrow keys to 230±4mm.
13) Adjust V-POSITION as arrow keys to center of the
screen.
14) Adjust H-SIZE as arrow keys to 306±4mm.
15) Adjust H-POSITION as arrow keys to center of the
screen.
16) Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.
17) Adjust TRAPEZOID as arrow keys to be the best
condition.
18) Save of the Mode 1.
19) PRESET EXIT → Y (Yes) command.
20) Display from Mode 2 to 12 and repeat above from
number 5) to 19)

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
DEGAUSS 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 10.
2) Adjust C961 (+) voltage to 50± 0.5Vdc with VR901.
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 10.
2) DIST.ADJ→CTRL PWM → High Voltage Command.
3) Adjust High Voltage to 25.5kV±0.1 kVdc.
4) Press Enter Key.
3. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 10.
2) Run alignment program for EQ770F on the IBM
compatible PC.
3) EEPROM → ALL CLEAR → Y(Yes) command.
 Do not run this procedure unless the
EEPROM is changed. All data in EEPROM (mode
data and color data) will be erased.
4) Power button of the monitor turn off → turn on.
5) COMMAND→PRESET START→Y(Yes) command.
6) DIST. ADJ. → CTRL PWM → TILT command.

4. Adjustment for White Balance and Luminance.
1) Set the White Balance Meter.
2) Press the DEGAUSS on the OSD menu for
demagnetization of the CDT.
3) COLOR ADJ. → LUMINANCE command of the
alignment program.
4) Set Brightness and Contrast to Max position, SubBrightness to 80(50) position.
5) Display color 0,0 pattern at Mode 10.
6) COLOR ADJ.→ BIAS ADJ.→ COLOR No. → 1
command of the alignment program.
7) Check whether green color or not at R-BIAS to 0
position, B-BIAS to min position and G-BIAS to
150(96) position. Adjust G2 (screen) command to
0.4± 0.1FL of the raster luminance.
8) Adjust R-BIAS and B-BIAS command to x=0.281±
0.005 and y=0.311 ±0.005 on the White Balance
Meter with PC arrow keys.
9) Adjust SUB-Brightness command to 0.6±0.1FL of the
raster luminance.
10) After push the “ENTER” key, and “COMMAND →
PRESET EXIT → Y(Yes)” command.
11) Set external Brightness to cutoff (0.06FL ± 0.01).
12) Display color 15,0 five Window pattern (50x50mm) at
Mode 10.
13) DRIVE ADJ.→ No 1. command.

- 14 -

14) Set SUB-CONTRAST 110(6E) (decimal) position.
15) Set G-DRIVE to 100(64) at DRIVE of the alignment
program.
16) Adjust R-DRIVE and B-DRIVE command to white
balance x=0.281±0.003 and y=0.311±0.003 on the
White Balance Meter with PC arrow keys.
17) Adjust SUB-CONTRAST command to 55±1FL of the
color 15,0 box pattern (50x50mm) luminance at
mode 10 and save in color 1.
18) After push the “ENTER” key, and “COMMAND →
PRESET EXIT → Y(Yes)” command.
19) Display color 15,0 full white patten at Mode 10.
20) COLOR ADJ. → LUMINANCE → ABL command.
21) Adjust ABL to 33±1FL of the luminance.
22) Exit from the program.

5. Adjustment for Color Management.
1) Display color 15,0 Window pattern(70x70mm) at
Mode 8.
2) Measure color management data at backraster cutoff, save it in EDID data.
6. Adjustment for Focus.
1) Display me pattern in full screen at Mode 10.
2) Adjust two Focus control on the FBT that focus
should be the best condition.

Monitor to be
adjusted

Figure 1. Cable Connection

- 15 -

TROUBLESHOOTING GUIDE
1. NO POWER

NO POWER
(POWER INDICATOR OFF)

CHECK
FUSE OK?
(F901)

NO

TROUBLE IN FUSE
(F901)

YES

CHECK
C908 VOLTAGE?
(AC120V: 160VDC,
AC220V: 304VDC)

NO

TROUBLE IN D900

YES

CHECK
IC901 PIN 6
WAVEFORM
(SQUARE WAVE
COMES OUT?)

NO

TROUBLE IN
IC901

NO

TROUBLE IN
D922, D923, D941,
D951, D961, D962, D971

YES

CHECK
D922, D923, D941, D951,
D961, D962, D971
VOLTAGE?

YES

TROUBLE IN Q903

- 16 -

2. NO CHARACTER
NO CHARACTER

CHECK
IC302
PIN 9 (5V) ?

NO

TROUBLE IN
P302 5V LINE

YES

CHECK
IC302 PIN 5, 6, 7 ?

NO

TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE

YES

CHECK
IC302 PIN 18, 19, 20 ?

NO

TROUBLE IN
IC302

NO

TROUBLE IN
P303 12V LINE/
80V LINE

NO

TROUBLE IN IC303

YES
CHECK
IC303 PIN 4 (80V)
PIN 8 (12V) ?

YES

CHECK
IC303
PIN 1, 2, 3 ?

YES
CHECK
R, G, B CATHODE
VOLTAGE?

NO

YES
TROUBLE IN
CRT SOCKET

- 17 -

TROUBLE IN
R331~R333,
L311~L313
D307~D312

3. NO RASTER

NO VIDEO
(POWER INDICATOR ON)

CHECK
POWER INDICATOR
GREEN or ORANGE?

ORANGE

DPM MODE
(NO H and/or V SYNC)

GREEN

CHECK
D712 ANODE
(-157V)?

NO

TROUBLE IN
D712

NO

TROUBLE IN
Q704

NO

TROUBLE IN
D941

YES

CHECK
G1 VOLTAGE?
(-55 ~ -15V)

YES

CHECK
CDT HEAT
VOLTAGE? (6.3V)

YES

TROUBLE IN
CDT

- 18 -

4. NO HORIZONTAL DEFLECTION

NO H-DEFLECTION
(ONE VERTICAL LINE)

CHECK
Q706?

NO

TROUBLE IN
Q706

NO

TROUBLE IN
50V LINE

NO

TROUBLE IN
Q719, Q720, D710

NO

TROUBLE IN
Q705

YES

CHECK
B+ VOLTAGE
(50V)?

YES

CHECK
T701(FBT) PIN 2
(31KHZ, 60V
69KHZ, 140V ?

YES

CHECK
Q705 COLLECTOR
WAVEFORM?

YES

0V
T

TROUBLE IN
T701, P701

- 19 -

5. TROUBLE IN H-LINEARITY

UNBALANCED OF H-LIN.

CHECK
IC401
PIN 22, 23, 24 ?

NO

TROUBLE IN
IC401 (MICOM)

NO

TROUBLE IN
Q711 ~ Q716

NO

TROUBLE IN
L703

YES

CHECK
Q711~Q716?

YES

CHECK
L703?

YES

Cs SIGNAL TABLE

TROUBLE IN
C722, C723, C726, C729

HORIZONTAL
FREQUENCY(fH)

Cs1

Cs2

Cs3

30.0kHz ~ 33.9kHz
34.0kHz ~ 35.9kHz
36.0kHz ~ 41.9kHz
42.0kHz ~ 43.9kHz
44.0kHz ~ 48.9kHz
490.kHz ~ 60.9kHz
61.0kHz ~ 69.9kHz

L
L
H
L
H
L
H

L
H
H
L
L
H
H

L
L
L
H
H
H
H

- 20 -

6. NO VERTICAL DEFLECTION

NO V-DEFLECTION
(ONE HORIZONTAL LINE)

CHECK
IC601 PIN 3
(15V)?

NO

TROUBLE IN
R603 15V LINE

YES

CHECK
IC601 PIN 7
(40V)?

NO

TROUBLE IN
HIGH-VOLTAGE OUT
CIRCUIT(FBT),
D721, R606

YES

CHECK
IC701 PIN 12, 13?

NO

3V

YES

TROUBLE IN
IC601, V-CIRCUIT

- 21 -

TROUBLE IN
IC701

7. TROUBLE IN OSD

NO OSD

(ENTER BUTTON MUST BE PRESSED.)

CHECK
IC301 B+ ?

NO

DC 5V

TROUBLE IN
5V LINE

YES

CHECK
IC301 PIN 5, 10
WAVEFORM?

NO

TROUBLE IN
IC601 PIN8 (V-FBP),
T701 40V LINE (H-FBP)

Pin 10
5V

Pin 5

YES

CHECK
IC301 PIN 12
WAVEFORM ?

NO

TROUBLE IN
IC302, IC301

NO

TROUBLE IN
IC301, IC302

H+V
5V

YES

CHECK
IC301 PIN 13, 14, 15 ?
H+V
5V

YES

TROUBLE IN
OSD PERIPHERAL
CIRCUIT

- 22 -

8. TROUBLE IN DPM

OFF MODE FAILURE

CHECK
IC401 (MICOM)
PIN 1, 42 (H/V INPUT)
SIGNAL?

YES

(NO OFF MODE.)

NO

H/V SYNC

CHECK
IC401 PIN 6
WAVEFORM?

5V

CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)

INPUT H/V SYNC SIGNAL

TROUBLE IN
X401

NO

YES

24MHz

CHECK
IC401 (MICOM)
PIN 4 ?

NO

(DPMF: 0V)

TROUBLE IN
IC401 (MICOM)

SEE DPM TABLE
YES

CHECK
B+ LINE
(6.3V,15V, 80V) ?

NO
TROUBLE IN Q903

YES

TROUBLE IN PC

DPM TABLE
Item

DPMF

DPMS

LED

NORMAL

H

H

GREEN

OFF

L

L

AMBER

Mode

- 23 -

9. NO DEGAUSSING

NO DEGAUSSING

CHECK
IC401 PIN 31
(0V)?

(DEGAUSS ON THE OSD MENU MUST BE PRESSED.)

NO

TROUBLE IN
IC401 (MICOM)

NO

TROUBLE IN
Q953

NO

TROUBLE IN
P902

YES

CHECK
Q953 COLLECTOR
VOLTAGE?
DC 15V
YES

CHECK
P902 ?

YES

CHECK
RL901?

NO

YES
TROUBLE IN
TH901,
DEGAUSSING COIL

- 24 -

TROUBLE IN
RL901

10. NO TILT (NO ROTATION )

NO TILT (NO ROTATION)

CHECK
Q504(COLLECTOR)
WAVE FORM ?

NO

TROUBLE IN
IC401 (MICOM)

12V

YES

CHECK
15V LINE
AND 6.3V LINE ?

NO

TROUBLE IN
15V LINE, 6.3V LINE

NO

TROUBLE IN
Q501~Q503

YES

CHECK
Q503 EMITTER
VOLTAGE ?

YES

TROUBLE IN
P501, TILT COIL, D501

- 25 -



---

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Modify Date                     : 2008:07:26 12:59:25-04:00
Create Date                     : 2001:10:18 15:23:02+09:00
Page Count                      : 20
Mod Date                        : 2008:07:26 12:59:25-04:00
Creation Date                   : 2001:10:18 15:23:02+09:00
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Metadata Date                   : 2008:07:26 12:59:25-04:00

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