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4V SERIES MANUAL Page 1 of 59
Fujitsu SERVICE MANUAL
COLOR MONITOR
MCM1514V D556Q 154V/C551
41A50-108-01
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V-C551.htm 05.06.2002
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4V SERIES MANUAL Page 2 of 59 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 FOR CHANGES, ERRORS OR OMISSIONS, file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\15
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4V SERIES MANUAL Page 3 of 59 TABLE OF CONTENTS PAGE 1. SPECIFICATIONS ..................................................................................................... 3 2. PRECAUTION AND NOTICES ................................................................................ 4 2-1 SAFETY PRECAUTIONS .............................................................................. 4 2-2 PRODUCT SAFETY NOTICE ..................................................................
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4V SERIES MANUAL Page 4 of 59 1. SPECIFICATIONS FOR 154V/C551 COLOR MONITOR 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 Mode 1 Mode 2 Mode 3 Mod
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4V SERIES MANUAL Page 5 of 59 2. PRECAUTIONS AND NOTICES 2-1 SAFETY PRECAUTIONS 1. Observe all caution and safety related notes located inside the display cabinet. 2. 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 equipment. 3. Do not install, remove o
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4V SERIES MANUAL Page 6 of 59 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 performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. 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 dama
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4V SERIES MANUAL Page 7 of 59 3. OPERATING INSTRUCTIONS 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-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 pl
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4V SERIES MANUAL Page 8 of 59 4. ADJUSTMENT 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. FUNCTION LOCATION DESIGNATION 1. 15V ADJ PCB - MAIN VR901 2. B + ADJ PCB - MAIN VR902 3. R.B. DRIVE CRT - BOARD VR801,802 4. R.G.B. CUT-OF
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4V SERIES MANUAL Page 9 of 59 4. Focus adjustment: A. Set mode 2 ( 640×480 Fh: 31.5KHz ) with character full page. B. Adjust external brightness to raster cutoff and external contrast to max. , then adjust focus VR to make the display be focused very 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 ? . (
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4V SERIES MANUAL Page 10 of 59 5. CIRCUIT DESCRIPTION 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. If key is pressed, the CPU w
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4V SERIES MANUAL Page 11 of 59 5-5 TRANSISTOR & DIODE CIRCUIT LOCATION CIRCUIT FUNCTION DESCRIPTION D901 ~ D904 Bridge Rectifier for AC Source D909 Half-Wave Rectifier for Start CKT D910 Clamp Diode for Snubber CKT D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D925 Rectifier for Output Voltage D927 Forward Bias when Q403 Turn-off to Protect B+ Block CKT D929 B+ Feed Back Rectifier from F.B.T Pulse Q904 Start CKT Am
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4V SERIES MANUAL Page 12 of 59 6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS 1.ABNORMAL POWER SUPPLY 90V,12V CHECK MAIN PC BOARD NG CHECK POWER SAVING CIRCUIT Q909,Q910 OK CHECK THE HIGE VOLTAGE OF CRT ABOUT 23.5 ~ 25.5KV CHECK FAILSAFE CKT Q402,Q403 RELATIVE CKT. NG OK CHECK THE VOLTAGE OF CRT HE
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4V SERIES MANUAL Page 14 of 59 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 2,16 ABOUT 8V CHECK 8V RELATIVE CIRCUIT NG OK CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp NG CHECK SIGNAL CABLE OR INTERFACE CARD. OK CHECK IC801 PIN 11 ABOUT 10Vpp CHECK THE RELATIVE CIRCUIT OF Q813,Q
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4V SERIES MANUAL Page 16 of 59 6-2 ABNORMAL DISPLAY NO SIGNAL ON SCREEN CHECK VIDEO IC VCC ABOUT 8V NG CHECK THE 12V PIN OF P802 CONNECTOR OK CHECK THE OUTPUT VOLTAGE OF IC801 PIN 13,15,18 ABOUT 3Vpp NG CHECK THE RELATIVE CIRCUIT OF Q813,Q814 & IC801 OK
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4V SERIES MANUAL Page 17 of 59 FBT PIN 5 ON MAIN PCB file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V-C551.htm 05.06.2002
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4V SERIES MANUAL Page 18 of 59 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT NO RASTER (DISCONNECT WITH SIGNAL CABLE) CHECK IC401 PIN 29 ABOUT 11.5VDC NG CHECK IC401 PIN 29 RELATIVE OK CIRCUIT CHECK IC401 PIN 26 WAVE FROM ABOUT 3Vpp NG CHECK IC401 PIN 4 ~ 7, PIN 13 RELATIVE CIRCUIT OK CHECK THE COLLECTOR VOLTAGE OF Q402 ABOUT 30Vpp FROM ABOUT 3Vpp NG CHECK Q
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4V SERIES MANUAL Page 19 of 59 3. ABNORMAL HORIZONTAL VIDEO CENTER SET H-CENTER TO CENTER CHECK IC401 PIN 4,7 NG 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 THE IC601 ABOUT 11.8V PIN 6 CHECK D601,C606 RELATIVE CIRCUIT NG
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4V SERIES MANUAL Page 20 of 59 6-7 SIDE-PIN CUSHION DISTORTION READJUST SIDEPIN FUNCTION VALUE CHECK IC401,Q404,Q405,Q406 NG RELATIVE CKT. 6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS NG LEAD WIRE,CRT SOCKET&CRT file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V-C551.htm 05.06.2002
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4V SERIES MANUAL Page 21 of 59 6-9 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 90V - 160V (DEPENDING UPON H.SYNC FREQUENCY) (B) CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V BEAD SET ABNORMAL VARIABLE OUTPUT CHECK AC LINE MAKE SURE THAT VOLT 120V OR 220V THE VARIABLE OUTPUT IS NOT SHORTED
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4V SERIES MANUAL Page 22 of 59 7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V-C551.htm 05.06.2002
