Panasonic TX-29P180B Service Manual

Contents

Panasonic TX-29P180B Service Manual Manual pdf 11 page image

5 ADJUSTMENT PROCEDURE5.1. VOLTAGE CONFIRMATIONItem/Preparation Adjustment Procedure1. +B voltage 1. TPA55: 144.8 ± 1V2. TPA56: 12 ± 1V3. TPA57: 9 ± 1V4. TPA: 2.5 ± 0.25V5.2. E.H.T CHECKItem/Preparation Adjustment Procedure1. Receive an RF signal, window or crosshatch pattern.2. Set the Brightness and Contrast to minimum (0 Beam)3. Connect the High Voltage Voltmeter to the CRT ANODE CAP.4. The set should be switched to AV (no input) contrast andbrightness minimum.1. Check the EHT voltage is (32.0 ± 1.0) kV.2. Switch from AV mode to TV.3. With the Brightness and the contrast controls MAX, check that thehigh voltage does not drop more than 3.0 kV from the abovemeasurement with R.F. signal.5.3. SUB CONTRASTItem/Preparation Adjustment Procedure1. Receive PAL colour bar pattern2. Connect oscilloscope to A51 pin 48.3. Set controls:BRT............. ...CENTERCOLOUR........CENTERCONTRAST....MAXAI................ ....OFF1. Adjust Sub Contrast (Service 1):A = 3.85 ± 0.1VFig. 12. Adjust Video gain 2 (Service 1) so that Sub picture level Bbecomes as same as Main picture level A.Fig. 211TX-29P180X