Panasonic TC-14A04A Service Manual

Contents

Panasonic TC-14A04A Service Manual Manual pdf 12 page image

TC-14A04A / TC-20A04A- 12 -5- PAL COLOR OUTPUT SIGNAL ADJUSTMENT1. Supply a color bar signal and adjust the local frequency.2. Adjust “IMAGE” to DYNAMIC NORMAL, “CONTRAST” to63 and “SUB-CONTRAST” to 21.3. Adjust the “CHANNEL COLOR” level to NORMAL.4. Set to CHK2 service mode option, press “5” on the remotecontrol unit and confirm that OSD becomes blue (AKBturned off).5. Set ABL to OFF (in CHK2 mode, to access BRT, CONT, S-CONT or S-TINT).6. Adjust [A] for 2.3 ± 0.2V through the BRIGHT control variationin the test point TPL2.7. Confirm:CRT 14 inch 20 inchRGB Contrast 2 DAC 7 DAC{352} 12 178. Fix G-DRIVE GAIN, R-DRIVE GAIN and B-DRIVE GAINdata in 1FH or 31 DAC.R-DRIVE GAIN: [SLV(8A), SUB (16)]G-DRIVE GAIN: [SLV(8A), SUB (17)]B-DRIVE GAIN: [SLV(8A), SUB (18)]CALIBRATION:1. Connect the oscilloscope in TPL2 (G-OUT) with a 10KΩresistor and adjust CONTRAST, so that the [B] waveformit is 2.3±0.1V with 14 CRT and 2.6±0.1V with 20 CRT.2. Adjust SUB-COLOR to obtain 2,45±0.1V in [D]according to fig. 1.3. Connect the oscilloscope in TPL1 (R-OUT) with a 10KΩresistor and confirm that the [C] waveform it is 2.45±0.1Vaccording to fig. 2.4. Press the key 5 (AKB ON) and confirm that OSDbecomes white.Fig. 1A = 2.3 ±0.1Vo-pB = 2.4±0.1VD = 2.45±0.1VFig. 2A = 2.3 ±0.2Vo-pC = 2.45±0.1V6- NTSC SUB-TINT CALIBRATION1. Connect the oscilloscope in TPL1 (R-OUT) with a 10KΩresistor.2. Supply a Rainbow signal (NTSC 3.58 MHz) throughVIDEO IN.3. Select IMAGE to DYNAMIC NORMAL.4. Select COLOR FOR CHANNEL to NORMAL.5. On CHK2 service mode, press 5 (AKB OFF) and confirmthat OSD becomes blue (AKB turned off).6. Set ABL to OFF (on CHK2 mode, to access BRT, CONT,S-CONT or S-TINT).CALIBRATION:1. Adjust [C] for 5.0±0.2V through the BRIGHT controlvariation (CHK2) according to fig. 1.2. Adjust SUB TINT-NTSC so that the levels of positions 2,3 and 4 of Fig. 1 in accordance with the Fig. 2.3. Set ABL to ON.4. Press 5 and confirm that OSD becomes white (AKBturned on).Fig. 1 Fig. 27- PROTECTION CIRCUIT (SHUTDOWN)CONFIRMATION OF OPERATION1. Supply a crosshatch pattern signal and adjust theCONTRAST and BRIGHT DAC controls to minimum.(Ibeam=0 μA)CONFIRMATION:1. Connect the voltmeter in TPA22 and confirm that thevoltage is smaller than [A].2. Connect a DC source in TPA22 and confirm that theprotection circuit doesn't act when the voltage is [B].3. Confirm that the protection circuit acts with smaller voltagethan [C].Condition 14 20A 21,6V 22,4VB 23,4V 23,4VC 26,1V 26,1VADJUSTMENTSITEM / PREPARATION PROCEDURE