Panasonic TC-21FX30LA Service Manual

Panasonic TC-21FX30LA Service Manual Manual pdf 24 page image

- 24 -TC-21FX30LA/LP / TC-29FX30LA/LPRGB CONTRAST - 4DAC{ 352 } - 14HConditionABC21” Samsung22,823,926,721” Philips23,324,527,429” flat23,224,127,0ADJUSTMENTS5- 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 controlvariation in the test point TPL2.7. Confirm that the RGB Contrast is 11DAC and {352} = 1B8. 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±0.5V with 14” CRT and 2.6±0.1V with 20” CRT.2. Adjust “SUB-COLOR” to obtain 2,45±0.5V 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±0.5Vaccording to fig. 2.4. Press the key “5” (AKB ON) and confirm that OSDbecomes white.Fig. 1A = 2.0 ±0.2Vo-pB = 2.3±0.5VD = 2.15±0.5VFig. 2A = 2.0 ±0.2Vo-pC = 2.5±0.5V6- 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, 3and 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].4. Use D512 catode or C511 (+) terminal, if TP22 access itis difficult.ITEM / PREPARATION PROCEDURE