Fujitsu 154V, D556Q, C551, MCM1514V User Manual

Fujitsu SERVICE MANUAL

Page

COLOR MONITOR

MCM1514V D556Q 154V/C551

41A50-108-01

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT

HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE

ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS LIABILITY

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FOR CHANGES, ERRORS OR OMISSIONS,

PAGE

SPECIFICATIONS .....................................................................................................

PRECAUTION AND NOTICES ................................................................................

2-1

SAFETY PRECAUTIONS ..............................................................................

4 2-2

PRODUCT SAFETY NOTICE .......................................................................

4 2-3

SERVICE NOTES ...........................................................................................

4 2-4

HIGH VOLTAGE WARNING .......................................................................

OPERATING INSTRUCTIONS ................................................................................

6 4.

ADJUSTMENT ..........................................................................................................

4-1

ADJUSTMENT CONDITIONS AND PRECAUTIONS ...............................

4-2

MAIN ADJUSTMENTS .................................................................................

7 4-3

ADJUSTMENT METHOD .............................................................................

7-8 5.

CIRCUIT DESCRIPTION ..........................................................................................

5-1

MICRO CIRCUIT ..............................................................

5-2

DEFLECTION CIRCUIT ...............................................................................

9 5-3

VIDEO CIRCUIT ..................................................................

………

.............

9 5-4

POWER SUPPLY ...................................................................

………

............

5-5

TRANSISTOR & DIODE CIRCUIT ..............................................................

TROUBLE SHOOTING CHART ..............................................................................

11 6-1

NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS ..............................

11 6-2

ABNORMAL DISPLAY .................................................................................

6-3

NO BLANKING ..............................................................................................

6-4

HOR. /OSC /DEF /HV CIRCUIT FAULT ......................................................

14 6-5

ABNORMAL HORIZONTAL DEFLECTION ..............................................

14 6-6

ABNORMAL VERTICAL SCANNING ........................................................

6-7

SIDE

PIN CUSHION DISTORTION ............................................................

6-8

POOR FOCUS .................................................................................................

16 6-9

POWER SUPPLY TROUBLE SHOOTING CHART ....................................

17 7.

MECHANICAL OF CABINET FRONT DIS

ASSEMBLY......................................

PARTS LISTING .......................................................................................................

19 9.

BLOCK DIAGRAM (DEFLECTION AND VIDEO) ................................................

9-1

BLOCK DIAGRAM (SMPS) ..........................................................................

10. IC BLOCK DIAGRAMS............................................................................................

11. PCB LAYOUT ............................................................................................................

11-1 MAIN PCB LAYOUT ...................................................................................

11-2 CRT BOARD LAYOUT ..............................................................................

12. SCHEMATIC DIAGRAM .........................................................................................

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TABLE OF CONTENTS

1. SPECIFICATIONS FOR 154V/C551 COLOR MONITOR

Horiz. Sync:

Vert. Sync:

Horizontal:

Vertical

Fh (KHz):

Fv (Hz)

60 75 85 75 85 60

Horizontal:

260 mm

Vertical:

195 mm

Horizontal:

30KHz

54KHz

50 Hz

120 Hz

Center:

0.3 mm Max.

Corner:

0.4 mm Max.

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1. CRT : 38.1CM(15V) 90 Deflection, 29mm Neck, 0.28mm Dot Pitch, Non-Glare Screen

2. Viewable image Size: 35.0CM (13.8") diagonal

3. Display Color: Unlimited Colors

4. External Controls: Power On/Off, UP/Down key, Function key: Contrast, Brightness, H-Size, H-center, V-Size, V-Center, Pincushion, Trapezoid.

5. Input Video Signal

6. Resolution

7. Display Size

Mode 1

RGB Analog RGB Analog RGB Analog RGB Analog RGB Analog RGB Analog RGB Analog TTL Level

Negative TTL Level

Positive

720 (H) 400 (V)

31.5 70

Mode 2

TTL Level Negative

640 (H) 480 (V)

31.5

Mode 3

TTL Level Negative

640 (H) 480 (V)

37.5

Mode 4

TTL Level Negative

640 (H) 480(V)

43.3

Mode 5

TTL Level Positive

800 (H) 600(V)

46.8

Mode 6

TTL Level Positive

800 (H) 600 (V)

53.7

Mode 7

TTL Level Negative

1024 (H) 768 (V)

48.4

8. Scanning Frequencies

Vertical:

9. Factory Preset Timings: 7 User Timings: 12

10. Misconvergence

11. Video Bandwidth: 65 MHz

12. Power Source: Switching Mode Power Supply

AC 100 ~240V, 50/60Hz Universal Type

13. Operating Temperature: 0°C to 40°C Ambient

14. Humidity: 10% to 85% Relative, Non-Condensing

15 Weight: 12 Kgs(Net), 14Kgs(Gross)

16. Dimensions Monitor: Carton: 460(W) × 425(H) × 494(D) mm Monitor: 360(W) × 364(H) × 385(D) mm

17. External Connection: 15 Pin D-type Connector AC Power Cord

2. PRECAUTIONS AND NOTICES

Operation of the display with the cover removed, may cause a serious shock hazard from the display power supply. Work on the

display should not be attempted by anyone who is not thoroughly familiar with precautions necessary when working on high voltage

proof goggles are worn. People who are not so

RAY radiation to 0.5 mR/HR. For continued protection, use the designated replacement

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, such as

Use an AC voltmeter having 5000 ohms per volt or with more sensitivity in the following manner: Connect a 1500 ohms 10

Watt resistor, paralleled by a 0.15UF, AC type capacitor between a known good earth ground (water pipe, conduit, etc.) and

the exposed metallic parts simultaneously. Measure the AC voltage across the combination of 1500 ohms resistor and 0.15UF

Voltage measured must not exceed 0.5 volts RMS. This corresponds to 0.35 milliamp AC. Any value exceeding this limit

Many electrical and mechanical parts in this chassis have special safety visual inspections and 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

When replacing a high wattage resistor (more than 1/2W of metal oxide film resistor) in circuit board, keep the resistor about 10mm

assembling the monitor after service, take care to ensure that the degauss coil is not trapped and does not have its

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2-1 SAFETY PRECAUTIONS

1. Observe all caution and safety related notes located inside the display cabinet.

equipment.

3. Do not install, remove or handle the picture tube in any manner unless shatterequipped 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 Xtube only, and adjust the voltages so that the designated maximum rating at the anode will not be exceeded.

screw heads. Test method for current leakage is described as follow.

(a) Plug the AC line cord directly into rated AC outlet (do not use a line isolation transformer during this check). (b)

2-2 PRODUCT SAFETY NOTICE

capacitor.

constitutes a potential shock hazard and must be corrected immediately.

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, clamp the lead wires around terminals before soldering.

2. (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.

5. When reinsulation damaged by screws, the metal card tray, or shielding edges.

2-4 HIGH VOLTAGE WARNING

Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be

Exercise care when servicing this chassis with power applied. Many B plus and high voltage terminals are exposed which, if carelessly

contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis

the specified rating for

It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the monitor

that could cause a rise in high voltage or operating supply voltages. No changes should be made to the original design of the monitor.

Components shown in the shaded areas on the schematic should be replaced with exact factory replacement parts. The use of

To determine the presence of high voltage, use an accurate, high impedance, HV meter connected between second anode lead and CRT

dag grounding device. When servicing the High Voltage System, remove static charge from it by connecting a 10K ohm resistor in series

with an insulated wire (such as a test probe) between picture tube dag and 2nd anode lead.(AC line cord disconnected from AC power

The picture tube used in this monitor employs integral implosion protection. Replace with tube of the same type number for continue

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performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment.

and picture tube dag when operating chassis.

Certain HV failures can increase X-ray radiation. Monitor should not be operated with HV the chassis type. The maximum operating HV specified for the chassis used in this monitor is

24.5KV ± 1KV

with a line voltage of 120/240 VAC. Higher voltage may also increase possibility of failure in HV supply.

unauthorized substitute parts may create a shock, fire or other hazard.

outlet.)

safety. Do not lift picture tube by the neck. Handle the picture tube only after discharging the high voltage completely.

levels exceeding

3. OPERATING INSTRUCTIONS

wire power cord must be

shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground. If the AC

outlet in your location does not have provisions for the grounded type plug, the installer should attach the proper adapter to ensure a

pin color display shielded signal cable to your signal system device and lock both screws on the connector to ensure

With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and contrast to the most

1. RED 9. NC 2. GREEN

10. GND

3. BLUE

11. SYNC.

GND

4. GND

12. SDA 5. GND

13. HORIZ. SYNC

GND

R 14. VERT. SYNC (

VCLK)

7. GND

G 15. SCL

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This procedure gives you instructions for installing and using the 154V/C551 Series display.

1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-

safe ground potential.

2. Connect the 15firm grounding. The connector information is as follow:

11 15

PIN NO.

15 - Pin Color Display

Signal Cable

DESCRIPTION

PIN NO.

DESCRIPTION

3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty seconds for display tube warmup. The Power-On indicator lights when the display is on.

4. pleasing display.

5. This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable to the PC.

6. If your 154V/C551 Series color display requires service, it must be returned with the power cord.

GND-B

4. ADJUSTMENT

CENTER,

Pincushion and Trapezoid Simply press the function key and the LED will be light up corresponding to the one selected, then press

Then you will press the up/function two keys simultaneously again, the most right four LEDS will light up for a while then

Bias) to make Y= 4

1. 15V ADJ

PCB

MAIN

VR901

B + ADJ

PCB

MAIN

VR902

R.B. DRIVE

CRT

BOARD

VR801,802

R.G.B. CUT

OFF CRT

BOARD

VR803,804,805

5. ABL ADJ

PCB

MAIN

VR701

6. UP KEY

PCB

MAIN

SW101

DOWN KEY

PCB

MAIN

SW102

FUNCTION KEY

PCB

MAIN

SW103

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4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory.

4-2 MAIN ADJUSTMENTS

NO.

4-3 ADJUSTMENT METHOD

1. 15V, B + & HV protection voltage adjustment: A. Chroma-2000 Signal generator or PC equivalent, set mode 1( VGA 640×480) pattern 1.0 . B. Connect a DC voltage meter between TP 901 and ground, then adjust VR901 to be 15VDC. C. Connect a DC voltage meter between TP 902 and ground, then adjust VR902 to be 88 VDC.

2. Factory preset timings adjustment: A. When you turn on the monitor, the function LEDS will light up simultaneously for a while, then extinguish. B. You can press the up/func two keys simultaneously, the most left four LEDS will light up for a while then extinguish. C. Then you can select one of the eight functions including Contrast, Brightness, H-SIZE, H-CENTER, V-SIZE, V-

FUNCTION

LOCATION

DESIGNATION

the up/down keys to get the factory presetting parameter value to your satisfaction.

extinguish, the factory preset timings adjustment is finished.

3. White balance and luminance adjustment: A. Bias (low light) adjustment:

(a) Set mode 5 ( 800×600 Fh: 46.8KHz ) full white pattern. (b) Adjust VR801, 802, 803, 804, 805, to make VR in the center position. (c) Warm up more than 20 minute. (d) Brightness set to max. Contrast set to min. full white pattern, then adjust FBT screen VR to make Y= 1.0FL ± 0.2FL (e) Brightness set to raster just cutoff, contrast set to 4FL, then adjust CRT board VR805 (B-Bias) VR803 (R-

0.2 FL, x= 281 ± 10, y= 311 ± 10

B. Gain (High light) adjustment:

(a) Set mode 5 ( 800×600 Fh: 46.8KHz ) full white pattern. (b) Brightness set to raster just cutoff and set the cantrast to max.

(c) Adjust VR801, 802 to make color code x=281 ± 10, y=311 ± 10. C. Recheck item A&B to make sure both of them in spec. D. Full white luminance:

(a) Set mode 5 ( 800×600 Fh: 46.8K ) full white pattern.

(b) Image size : H:260±4mm, V:195±4mm.

(d)

Adjust VR701 to make sure white luminance at 28 FL.

4. Focus adjustment:

Adjust external brightness to raster cutoff and external contrast to max. , then adjust focus VR to make the display be focused very

See below

Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to obtain a complete field of

the color red. This is done by moving the two tabs in such a manner that they advance in an opposite direction but at the same time

Vertical red and blue lines are converged by varying the angle between the two tabs of the 4 pole magnets on the PCM assembly. (See

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A. Set mode 2 ( 640×480 Fh: 31.5KHz ) with character full page. B.

well.

5. Purity adjustment A. Be sure that the display is not being exposed to any external magnetic fields.

B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is 29 ? . (

diagram)

to obtain the same angle between the two tabs, which should be approximately 180'.

D. Check the complete blue and complete green patterns to observe their respective color purity. make minor adjustments if needed.

RELATIVE PLACEMENT OF TYPICAL COMPONENTS

Purity Magnets

6-pole Convergence Magnets

4-pole Convergence Magnets

Deflection Yoke

6. Convergence adjustment

A. Produce a magenta crosshatch on the display. B. Adjust the focus for the best overall focus on the display.

Also adjust the brightness to the desired condition.

above diagrams) D. Horizontal red and blue lines are converged by varying the two tabs together, keeping the angle between them constant. E. Produce a white crosshatch pattern on the display. F. Vertical green and magenta lines are converged by varying the angle between the two tabs of the 6-pole magnets. G. Horizontal green and magenta lines are converged by varying the two tabs together, keeping the angle between them constant.

5. CIRCUIT DESCRIPTION

If key is pressed, the CPU will do some job according to the key function. For example, if function key is pressed, it can change different

Hor. sync. and ver. sync., come from PC, go into the CPU (IC101). The output goes to the Hor. oscillation and Ver. oscillation processor

(IC401). The IC401 treats sync. signal and output the drive signal to horizontal and vertical output circuit. IC401 also generates some

C bus control, the geometry can be controlled. IC601 is a vertical

output IC to supply the vertical scan. Q404, Q405, Q406 and L405 are the horizontal size controls. Q403 is the horizontal deflection

IC801 is a video amplifier, clamping signal input from pin No. 11 to restore the DC voltage of video signal, the signal output from IC801

pass through IC802 video package amplifier stage LM2438, then go to the cut off DC restore stage, The video output signal is about

mode resulting in a multiple output switcher with stack well. Faster

diodes are used. The fast transient response of the control loop maintains picture integrity. Very fast current limiting protects the switcher

UC3842AM (IC901) is the current mode controller selected. It offers feed forward compensation, feedback error amplifier, and low

voltage lock out features. The 3842 draws very little current is start up mode. There is enough power from the line bleeder to slowly charge

The FET starts a cycle by allowing current to flow into the primary of the power transformer. As current ramps up with time, the voltage

across the current sense resistor (R929) also ramps to a point where the 3842 determines that enough power is stored and turns off the FET.

As the voltage on the transformer reverses, power is dumped from the main power transformer through diodes into the different supplies.

off snubber network is placed across the FET. Current from the secondary

windings are rectified and filtered to freate the desired voltages. Small high current capacitors quickly return charging current to the source.

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5-1 MICRO CIRCUIT

IC101 is CPU, This CPU has the following functions.

1. Detect timing mode by sensing the horizontal frequency, vertical frequency, the polarity of Hor. Sync and Ver. Sync.

2. Key board scan control.

3. Cs capacitor switch control.

4. Power saving control. When CPU detects timing, it takes data from E²PROM (IC102), then output voltage to control the geometry of this monitor.

value to control screen geometry (H-SIZE, V-SIZE...etc.)

5-2 DEFLECTION CIRCUIT

functions for geometry use, like, horizontal center, vertical size, by I² output, supply the horizontal scan of the monitor. Q707 and Q601 generate the Blanking signal output to G1 of CRT.

Q703 Q704 and Q705 are mute control, brightness control and G1 DC voltage output.

5-3 VIDEO CIRCUIT

40Vpp.

5-4 POWER SUPPLY

The design uses a discontinuous flyback topology operating in current-

agains short circuits.

a capacitor to the 16 volts needed to start the switcher.

To keep RFI to a minimum and reduce transistor heating, a turn-

Filter inductors remove high frequency noise.

5-5 TRANSISTOR & DIODE CIRCUIT

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LOCATION

CIRCUIT FUNCTION DESCRIPTION

D901 ~ D904 D909 D910 D919 D922 D923 D925 D927 D929 Q904 Q907, Q908 Q909, Q910 Q912, Q920 Q401 Q402 Q407, Q408 Q410, Q426

Bridge Rectifier for AC Source Half-Wave Rectifier for Start CKT Clamp Diode for Snubber CKT Rectifier for Output Voltage Rectifier for Output Voltage Rectifier for Output Voltage Rectifier for Output Voltage Forward Bias when Q403 Turn-off to Protect B+ Block CKT B+ Feed Back Rectifier from F.B.T Pulse Start CKT Amplifier Transistor Use for Off-Mode to Cut-off 6.3V Supply Voltage Use for Standy-By or Suspend Mode to Cut-off 14.5V Supply Voltage Push-Pull Topology to Drive Q911 Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block HOR. Driver Transistor As a Switcher for H-Size Correction CKT

H-Size Corection Mosfet (Q426 15" only) Q404, Q405 Q406 Q703 Q704, Q705 Q601, Q707 Q813, Q814

As Differential Amp. to Drive Q406

Darlington Transistor for H-Size Control

As a Switcher to Mute Screen when Abnormal Qccurring

Unit Brightness Control CKT

Develop Blanking Signal

A Amplifier to Corection and Support Clamp Signal

CHECK MAIN PC BOARD

OF CRT ABOUT 23.5 ~ 25.5KV

HEATER ABOUT 6.3V

CHECK CRT G1 VOLTAGE

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1.ABNORMAL POWER SUPPLY

90V,12V

CHECK THE HIGE VOLTAGE

CHECK THE VOLTAGE OF CRT

CHECK SCREEN VOLTAGE ABOUT 400V TO 600V

LESS THAN 300V

BRIGHTNESS SET TO MAX. THEN

CHECK VOLTAGE OF THE CRT CATHODE ABOUT 60V TO 70V

6.TROUBLE SHOOTING CHART

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS

CHECK POWER SAVING CIRCUIT Q909,Q910

CHECK FAILSAFE CKT Q402,Q403 RELATIVE CKT.

CHECK CRT’S HEATER RELATIVE CIRCUIT Q907,Q908

CHECK FBT. D706,R723,C713

CHECK BRIGHTNESS CIRCUIT Q703,Q704,Q705 RELATIVE CKT.

REFER ITEM 8-2 “ABNORMAL DISPLAY”

2.ABNORMAL VIDEO LEVEL ON SCREEN

PIN 2,16 ABOUT 8V

R.G.B. ABOUT 0.7Vpp

IC801 PIN 13,15,18 ABOUT 3Vpp

ABOUT 5V

Page

CHECK THE VOLTAGE OF IC801

CHECK THE SIGNAL INPUT OF

CHECK IC801 PIN 11 ABOUT 10Vpp

CHECK 8V RELATIVE CIRCUIT

CHECK SIGNAL CABLE OR INTERFACE CARD.

CHECK THE RELATIVE CIRCUIT OF Q813,Q814 OR CLAMP.

CHECK THE VIDEO OUTPUT OF

R.G.B. APPROACH STANDARD

3. ABNORMAL DDC (PLUG & PLAY)

CHECK IC101 PIN 5 VOLTAGE

CHECK IC801,Q813,Q814

CHECK SIGNAL CABLE

CHECK IC102 GOOD OR FAIL

NO SIGNAL ON SCREEN

CHECK VIDEO IC VCC ABOUT 8V

CATHODE ABOUT 40Vpp

SCREEN ABOUT 400 TO 600V

Page

CHECK THE OUTPUT VOLTAGE OF IC801 PIN 13,15,18 ABOUT 3Vpp

6-2 ABNORMAL DISPLAY

CHECK THE 12V PIN OF P802 CONNECTOR

CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 75V

CHECK THE VOLTAGE OF CRT

CHECK THE VOLTAGE OF FBT

CHECK THE RELATIVE CIRCUIT OF Q813,Q814 & IC801

CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB

CHECK THE IC802 RELATIVE CIRCUIT

LESS THAN 400V

EXCEED 600V

CHECK THE RELATIVE CIRCUIT OF BLANKING

CHECK C836,R859 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT

CHECK FBT RELATIVE CIRCUIT

CHECK CRT RELATIVE CIRCUIT OR REFER ITEM 7-1

6-3 NO BLANKING

CHECK THE RELATIVE CIRCUIT OF Q601 & Q707 ON MAIN PCB

FBT PIN 5 ON MAIN PCB

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NO RASTER (DISCONNECT WITH SIGNAL CABLE)

CHECK IC401 PIN 29 ABOUT 11.5VDC

READJUST H

SIZE FUNCTION

90V AT FH=31KHz

ABOUT 24.5KV

CIRCUIT OF SMPS.

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NG OK

1. ABNORMAL HORIZONTAL SIZE

CHECK FBT VOLTAGE ABOUT

CHECK THE HV OF CRT

2. ABNORMAL HORIZONTAL RASTER CENTER

CHECK D418,D419,R457,R458,L404

6-4 HOR./OSC/DEF/HV CIRCUIT FAULT

CHECK IC401 PIN 26 WAVE FROM ABOUT 3Vpp

CHECK THE COLLECTOR VOLTAGE OF Q402 ABOUT 30Vpp

CHECK THE COLLECTOR VOLTAGE OF Q403 ABOUT 1250Vpp AT FH:31KHz

6-5 ABNORMAL HORIZONTAL DEFLECTION

CHECK IC401 PIN 29 RELATIVE CIRCUIT

CHECK IC401 PIN 4 ~ 7, PIN 13 RELATIVE CIRCUIT

CHECK Q402,T401 RELATIVE CIRCUIT

CHECK T401,T402,Q402,Q403, D408,C418,C419,H-DY,B+

CHECK THE RELATIVE CIRCUIT OF Q404,Q405, & Q406

CHECK THE RELATIVE

3. ABNORMAL HORIZONTAL VIDEO CENTER

SET H

CENTER TO CENTER

CHECK THE IC601 ABOUT 11.8V PIN 6

Page

CHECK IC401 PIN 4,7 RELATIVE CIRCUIT

4. ABNORMAL HORIZONTAL LINEARITY

CHECK L401,Q408,Q410,C427 & DY IC101 PIN 29 (CS1)

6-6 ABNORMAL VERTICAL SCANNING

1. ABNORMAL VERTICAL SIZE

READJUAT V-SIZE FUNCTION VALUE

CHECK D601,C606 RELATIVE CIRCUIT

CHECK VERT. OSC CIRCUIT

CHECK THE VOLTAGE OF IC101

RELATIVE CIRCUIT

OK NG

READJUAT V-SIZE FUNCTION VALUE

CHECK IC401 PIN 20,21,22,23 RELATIVE CIRCUIT

2. VERTICAL CENTER

READJUAT V-CENTER FUNCTION VALUE

CHECK IC401 & IC601 RELATIVE CKT

CHECK IC401,Q404,Q405,Q406

RELATIVE CKT.

CHECK FOCUS CONTROL UNIT, FOCUS

LEAD WIRE,CRT SOCKET&CRT

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READJUST SIDEPIN FUNCTION VALUE

READJUST FOCUS CONTROL

6-7 SIDE-PIN CUSHION DISTORTION

6-8 POOR FOCUS

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