Panasonic TC-21FG10P Service Manual

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Panasonic TC-21FG10P Service Manual Manual pdf 7 page image

2.5.1. +B VoltageItem / preparation1. Operate the TV set.2. Set control as follows :Brightness ........... minimumContrast ............... minimumAdjustment procedure1. Confirm the DC voltage at the indicated test points, asfollows :TPA 10 : 141.0 ± 1.5VTPA 8 : 8 ± 1VTPA 9 : 5 ± 1VTPA 21 : 175 ± 15V2.5.2. RF AGCItem / preparation1. Receive a colour bar signal at an RF level of 69 ± 1-2 dBUwith 75Ω loaded.2. Connect digital multimeter to RF AGC at Tuner.Adjustment procedure1. Select “RF AGC” indication in CHK2, on Screen by remotecontrol at factory mode.2. Set RF AGC by using remote control Volume (+) or Volume(-) button until voltage AGC at Tuner reaches 2.3 ± 0.1V atTPA 15 (Tuner point).3. Increase RF signal strength by 2dB, confirm AGC at Tunervoltage drop.2.5.3. High VoltageItem / preparation1. Receive the crosshatch pattern.2. Set to 0 Beam.Screen VR .......... minimumContrast .............. minimumAdjustment procedure1. Connect a DC voltage meter to TPA 10 and confirm the +Bvoltage is 141.0 ± 1.5V.2. Connect a high frequency voltmeter to heater and confirmthat voltage reads 6.3 ± 0.24 (VRMS).3. Normalize the brightness and contrast.2.5.4. NTSC TINT COLOURItem / preparation1. Connect oscilloscope probe to TPL1 (R OUT) with 10kΩseries resistor.2. Press Main Menu and set system to use AV-NTSC (3.58MHz).DYNAMIC ................... NormalChannel CLR Set ..... STDAdjustment procedure1. Adjust Sub-Tint so that No. 2, 3 and 4 becomes levelwaveform is similar to Fig. 3.2. Confirm phase at Tint is changes more than ± 15 by Tintcontrol.3. Confirm that colour level is maximum when colour DAC isadjusted to maximum position.Note: Use remote control only when adjusting user mode toSub-Tint.2.5. Adjustment Procedure7