Panasonic TC-21Z80PQ Service Manual

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Panasonic TC-21Z80PQ Service Manual Manual pdf 7 page image

4.2. Colour Purity1. Set Bright and Contrast controls to their maximumpositions.2. Operate the TV set over 60 minutes.3. Full degauss the picture tube by using an externaldegaussing coil. By rotating R-B static convergencemagnet.4. Apply a crosshatch pattern signal and adjust roughly thestatic convergence magnets.5. Apply a green pattern signal.6. Loosen a clamp screw for the Deflection Yoke and movethe Deflection Yoke as close to the purity magnet aspossible.7. Adjust the purity magnet so that a vertical green field isobtained at the center of the screen.8. Slowly press the Deflection Yoke and set it where a uniformgreen field is obtained.4 ADJUSTMENT PROCEDURE4.1. Adjustment ProcedureItem / Preparation Adjustment Procedure+B Voltage Confirm the DC voltage at the indicated test points, as follows :1. Operate the TV set. TPA 10 : 141.0 ± 1.5V2. Set control as follows : TPA 8 : 8 ± 1VBrightness ........... minimum TPA 9 : 5 ± 1VContrast .............. minimum TPA 21 : 215 ± 15VRF AGC1. Receive a colour bar signal at an RF level of 69+1-2 dBU with 75Ω loaded.1. Select “RF AGC” indication in CHK2, on Screen by remote control at factorymode.2. Connect digital multimeter to RF AGC at Tuner. 2. Set RF AGC by using remote control Volume (+) or Volume (-) button until voltageAGC at Tuner reaches 2.6 ± 0.1V at TPA 15 (Tuner point).3. Increase RF signal strength by 2dB, confirm AGC at Tuner voltage drop.High Voltage1. Receive the crosshatch pattern. 1. Connect a DC voltage meter to TPA 12 and confirm the +B voltage is 141.0 ±1.5V.2. Set to 0 Beam.Screen VR .......... minimum 2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3± 0.24 (VRMS).Contrast .............. minimum3. Normalize the brightness and contrast.Item / Preparation Adjustment ProcedureNTSC TINT COLOURConnect oscilloscope probe to TPL1 (R OUT) with10kΩ series resistor.Press Main Menu and set system to use AV-NTSC(3.58 MHz).DYNAMIC................. NormalChannel CLR Set ..... STD1. Adjust Sub-Tint so that No. 2, 3 and 4 becomes level waveform is similar to Fig.3.2. Confirm phase at Tint is changes more than ± 15 by Tint control.3. Confirm that colour level is maximum when colour DAC is adjusted to maximumposition.Note: Use remote control only when adjusting user mode to Sub-Tint.Fig. 37TC-21Z80PQ