Panasonic TC-21P50R Service Manual

Also see for TC-21P50R: Operating instructions

Contents

Panasonic TC-21P50R Service Manual Manual pdf 11 page image

- 11 -Adjustment ProcedureItem / Preparation Adjustment ProcedureB Voltage1. Operate the TV set.2. Set controls :Bright.................. minimumSub Bright........... minimumVolume................ minimum1. Confirm that the indicated test points for the specified voltage:TPA140 : 115.0 ± 2.0 V TPA12 : 12.0 ± 1.0 VTPA05 : 5.0 ± 1.0V TPA09 : 9.0 ± 1.0VTPA32 : 5.0 ± 1.0VTPA220 : 21.5 ± 1.5VRF AGC1. By using spectrum & attenuator ensurethe RF signal input to the TV is 69dBU(75 W open).2. Connect digital multimeter to TPA20.1. Select "RF AGC" indication in CHK2. ON Screen by remote controlat factory mode.2. Set RF AGC by control volume (-) or (+) at voltage TPA 20 reach2.6 ± 0.3V.3. Increase RF signal strength by 2dB. Confirm TPA20 voltage drop.EHT & HEATER1. After H-WIDTH Rough Adjustment.2. Receive the crosshatch pattern.3. Set to 0 beam.(screen VR :MIN. CONTRAST :MIN.)1. Connect DC voltage meter to D831 Cathode and confirm that +Bvoltage is 142.0 ± 2V.2. Connect High frequency voltmeter to heater, and confirm that voltagereads 6.3 ± 0.24 (VRMS)3. Connect High voltage meter to CRT anode, and confirm that highvoltage is less than 28.5 (+0.7, -1.5)V .SUB CONTRAST1. Connect oscilloscope probe to TPA41 (G OUT).2. Receive the PAL colour bar pattern, andadjust local frequency at the best tunedposition.3. Connect short-jumper to TPA57 andTPA50.4. Connect short-jumper to FBT pin3 andTPA32.5. Picture menu : DYNAMIC NORMAL.AI : OFFChannel colour SET....STD.6. Set to 2.3 ± 0.2V by BRIGHT.1. Adjust Sub-Contrast, so that waveform is 2.5 ± 0.1Vp-p as shown.PAL COLOUR OUTPUT1. Receive the PAL colour bar pattern, andadjust local frequency at the best tunedposition.2. Connect short-jumper to TPA57 andTPA50.3. Connect short-jumper to FBT pin3 andTPA32.4. Picture menu : DYNAMIC NORMAL.AI : OFFChannel colour SET....STD.5. Set to 2.3 ± 0.2V by BRIGHT.1. Connect oscilloscope prebe to TPA41 (G OUT) and adjust SUBCOLOUR, so that waveform is 2.5 ± 0.1Vp-p as in Fig.1.2. Connect oscilloscope prebe to TPA40 (R-OUT) and conform thewaveform is 3.2 ± 0.5Vp-p as in Fig.2.2.5±0.1Vp-p2.3±0.2V0V2.5±0.1Vp-p2.3±0.2VFig.1Fig.20V3.2±0.5Vp-p2.3±0.2