Panasonic TC-14A12P Service Manual

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Panasonic TC-14A12P Service Manual Manual pdf 22 page image

- 22 -TC-14A12P / TC-20B12Service Adjustments and CalibrationsNTSC SUB-TINT CALIBRATION1. PREPARATION:1.1. Connect the oscilloscope to TPL1 (R OUT) in serie with a10KΩ resistor.1.2. Receive a rainbow pattern through VIDEO IN.1.3. Adjust “IMAGE” to DYNAMIC NORMAL.1.4. Adjust “COLOR FOR CHANNEL” to NORMAL.1.5. Set the CHK2 service mode option, press “5” on the remotecontrol unit and confirm that OSD becomes blue (AKB turned off).1.6. Connect a short circuit jumper between TPA10 and TPA20.2. CALIBRATION:2.1. Adjust [C] for 5.0±0.2V through the BRIGHT control variationaccording to fig. 1.2.2. Adjust the NTSC SUB-TINT level according to fig. 1 positions2, 3 and 4.2.3. Remove the jumper , press “5” and confirm that OSD becomeswhite (AKB turned on).Fig. 1Fig. 2PROTECTION CIRCUIT (SHUTDOWN)CONFIRMATION OF OPERATION1. PREPARATION:1.1. Receive a crosshatch pattern.1.2. Adjust CONTRAST and BRIGHT controls to minimum.2. CONFIRMATION:2.1. Connect the voltmeter in TPA22 and confirm that the voltageis smaller than [A].2.2. Connect a DC source in TPA22 and confirm that the protectioncircuit doesn't act when the voltage is [B].2.3. Confirm that the protection circuit acts with smaller voltagethan [C].Condition 14 inches 20 inchesA 19,67V 21,18VB 20,66V 22,31VC 22,49V 24,37VC0V1 2 3 4 5 6 7 8 9 10WHITE QUALITY CALIBRATION1. PREPARATION:1.1. Adjust the HELMHOLTZ device to local magnetic field. Hori-zontal: 0 ± 0.003 X 10-4T1.2. Receive a white purity pattern.1.3. Adjust CONTRAST and BRIGHT controls to maximum.1.4. Previously adjust the CONVERGENCE.1.5. Fully degauss the CRT by using an external degaussing coil.2. CALIBRATION:2.1. Adjust the magnetic field in 0.4x10-4T (400 mG), and checkthe white quality with the CRT turned to EAST and to WEST.2.2. Receive a red pattern, adjust the COLOR control to maximumand confirm the purity adjustment.2.3. If purity error is found at the CRT corners, to apply magnetictapes to correct it, fully degauss the CRT again and repeat thesteps 1 and 2. Don't use this magnetic tapes on the internal sideof the yoke.2.4. Receive a white purity pattern, adjust the COLOR control tomaximum and confirm the purity adjustment.VERTICAL DEFLECTIONCALIBRATION AND CONFIRMATION1. PREPARATION:1.1. Adjust the HELMHOLTZ device to the local magnetic field1.2. Adjust IMAGE to DYNAMIC NORMAL.2. CONFIRMATION AND CALIBRATION S-CORR :• CONFIRMATION IN 50HZ2.1. Receive a PAL-N Philips pattern2.2. Confirm that S-CORR 50Hz is in [18] DAC.• CONFIRMATION IN 60HZ2.3. Receive a monoscope pattern.2.4. Confirm that S-CORR 60Hz is in [18] DAC.• V-SLOPE CALIBRATION2.5. Receive a monoscope pattern.2.6. Adjust V_SLOPE so that the beginning of the black part ofthe image be aligned with the center of the CRT as below.3. VERTICAL CENTRALIZATION 50 HZ CALIBRATION3.1. Receive a PAL-N Philips pattern3.2 Adjust V-SHIFT 50Hz so that Philips pattern’s center it is inthe CRT center.4. VERTICAL CENTRALIZATION 60 HZ CALIBRATION4.1. Receive a monoscope pattern.4.2. Adjust V-SHIFT 60Hz so that the monoscope pattern’s it is inthe CRT centerBC2 3 4 A:B = 1:2CRTCENTER