User manual CTX EX951F Service Manual

[. . . ] SERVICE MANUAL COLOR MONITOR P993Z Series EX951F CTX P/N : P993Z-3-00-A Date : Jun-02-03 Version : A00 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, MANUFACTURE DATE : Jun. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRECAUTION AND NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The use of unauthorized substitute parts may create a shock, fire or other hazard. 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 20K 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 outlet. ) The picture tube used in this monitor employs integral implosion protection. Replace with tube of the same type number for continue safety. Handle the picture tube only after discharging the high voltage completely. 6 3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 9K color display. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Threewire 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 safe ground potential. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow: 1 6 11 5 10 15 15 - Pin Color Display Signal Cable PIN NO. DESCRIPTION RED GREEN BLUE GND GND GND-R GND-G GND-B PIN NO. SYNC (VCLK) SCL Apply power to the display by turning the power switch to the "ON" position and allow about thirty seconds for display tube warm-up. The Power-On indicator lights when the display is on. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and contrast to the most pleasing display. This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable to the PC. Don't needed adjust it individual at every timing Mode and save in the memory. H Model select: for factory only, service engineer can't changed. 8 FACTORY PRESET H: 68. 8KHz H: 36. 51kHz V: 85Hz V: 51. 34Hz HS Vs HP Vc TC 9300 6500 B Tm BI 080 70 CONTRAST BRIGHTNESS H-CENTER H-SIZE V-CENTER V-SIZE ZOOM H-MOIRE REDUCE V-MOIRE REDUCE R-GAIN G-GAIN B-GAIN R-BIAS G-BIAS R-BIAS 9300 6500 COLOR TEMPERATURE COLOR TEMPERATURE DEGAUSS OSD EXIT RETURN Vs LINEAR Vc LINEAR TC BC TOP COMER BOTTOM COMER PINCUSHION TRAPEZOID PIN-BALANCE PARALLELOGRAM ROTATION HS HP SUB-H-SIZE H-SIZE-PHASE BI B/I ON/OFF Used time Tm 9 3. Bias (Low Luminance) adjustment: (a) Set mode 5 1024 x 768 Fh: 68. 7KHz full white pattern. (b) To make the adjustment condition is under the Factory preset window. Contrast VR to make Y= 4. 0±0. 5cd/m2. [. . . ] Usually the free-running frequency should be lower than the minimum trigger frequency. 12 5-3 TRANSISTOR & DIODE CIRCUIT LOCATION D101 D405 D406 D408 D414~ D416, D418 Q401 Q402 Q403 Q404, Q406 Q405 Q407 Q410, Q412, Q417, Q418 D707 D704 D709 D706, D708 Q707 Q703, Q706 Q708 DB901 D918 ~ D919 D921 ~ D923 D924 D925 D926, D927 D939 ZD901 ZD903 Q911 Q912, Q915 Q914 Q850 ~ Q852 FUNCTION AL DESCRIPTION For C102 Discharge Speed up for Q403 Supply a bias for D408 Damping Diode and Modulation Diode Buffer Diode for Q412, Q417, Q418, Q420 B+ Mute Control Horizontal Driver Horizontal Out Put A differential Amp for Drive Q405 Darlington Transistor for H-Size Control Horizontal Linearity Correction Control Horizontal S-Correction Control Mixing Diode Rectifier for 250V Supply Protection Diode for Q708 Rectifier for -200V Supply Picture Mute Control AMP Brightness Control CKT Vertical Dynamic Focus Control AMP Bridge Rectifier for AC Source Rectifier for Output Voltage Supply Rectifier for Output Voltage Supply Clip Diode for Trigger CKT Rectifier for B+ Supply Raster Position Control Clip Diode for Snuffer Pulse Protection Diode Protection Diode MOS FET for B+ Control Push Pull Driver for Q911 Pre-Amplifier for Q912, Q915 DC Restoration for CRT Bias Adjustment 13 6. TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY CHECK MAIN PCB POWER SUPPLY 80V 60. 5V, 14. 5V, 137. 5V, 14. 5V, 80V NG CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL OK OK CHECK THE HIGE VOLTAGE CHECK THE HIGE OF CRT ABOUTVOLTAGE 25. 5~27. 5KV OF CRT ABOUT 25. 5 ~ 26. 5KV 26. 5~27. 5KV REFER ITEM S. M. P. S. NG OK CHECK THE VOLTAGE OF CRT HEATER ABOUT 6. 3V NG OK CHECK FAILSAFE CKT IC401 PIN 2 RELATIVE CKT. CHECK CRT'S HEATER RELATIVE CIRCUIT CHECK SCREEN VOLTAGE ABOUT 400V TO 700V LESS THAN 300V OK CHECK FBT BRIGHTNESS SET TO MAX. THEN CHECK CRT G1 VOLTAGE CHECK BRIGHTNESS CIRCUIT Q703, Q706, Q707 RELATIVE CKT. NG OK CHECK VOLTAGE OF THE CRT CATHODE ABOUT 60V TO 70V NG REFER ITEM 8-2 "ABNORMAL DISPLAY" 14 2. ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 7, 15. 18, 21 ABOUT 12V PIN 6, 9, 22 ABOUT 12V NG OK CHECK THE SIGNAL INPUT OF R. G. B. ABOUT 0. 7Vpp CHECK 12V RELATIVE CIRCUIT OK 5 CHECK IC801 PIN 15 CLAMP PULSE 11 PIN 16 BLANK PULSE CHECK SIGNAL CABLE OR INTERFACE CARD. NG OK CHECK THE VIDEO OUTPUT OF IC801 16, 19, 22 PIN 18, 20, 23 ABOUT 4Vpp, CONTRAST SET MAX. APPROACH STANDARD CHECK THE IC105 RELATIVE CIRCUIT OR IC401 PIN 16 OUTPUT 1~24 CHECK IC801 PIN 13 ABOUT 4V PIN 26, 27, 28 ABOUT 4V OR CHECK Q801 AND RELATIVE CKT 3. [. . . ]