Panasonic TC-14A04A Service Manual

Contents

Panasonic TC-14A04A Service Manual Manual pdf 11 page image

- 11 -TC-14A04A / TC-20A04AADJUSTMENTSITEM / PREPARATION PROCEDURE2- VIF DETECTOR OUTPUT LEVELCONFIRMATIONCONFIRMATION:1. Install the chassis in the VIF calibration JIG and tune in a63 dBU colorbar pattern (75Ω opened).2. Connect the oscilloscope in TPA31.3. Confirm that the output video sign is 1.05 ± 0.15 Vp-p inTPA 31.3- BUZZING CONFIRMATION(AUDIO CIRCUIT)1. Connect the oscilloscope with a 7kHz filter between A22-2 and A22-3 speakers terminals .2. Adjust the sound to maximum.3. Adjust AVL: OFFCONFIRMATION:1. Supply a colorbar signal with local frequency adjustedand the AFC ON (Channel with sound bearer and withoutmodulation).2. Assure that the width in the buzzing waveform is smallerthan 500 m Vp-p.1- RF AGC ADJUSTMENT1. Supply a color bar pattern and adjust the RF input signalof 69 dB μV (75Ω opened channel 07 RF freq.: 175.25MHz).2. Connect the digital multimeter in TPA15.ADJUSTMENT:1. Select RF AGC on CHK2 service mode.2. Adjust "RF AGC" by pressing VOL(+) or (-) until obtaining2.2±0.1V in TPA15.3. Increase the input level by +2 dB and confirm that thevoltage decreases in TPA15.CONFIRMATION1. Connect a voltage meter between TPA10 and ground.Confirm that the voltage +B is within a range of 140.5V±1.5V2. Connect a high frequency voltage meter (VRMS) amongthe heater, and confirm that the voltage is as below:3. Connect the high voltage meter in the CRT anode pin,and confirm that the high voltage is within [A] range.4- ANODE AND HEATER VOLTAGE CONFIRMATION1. Supply a crosshatch signal.2. Adjust the current beam to zero. (0 beam).3. Adjust “SCREEN VR” and “CONTRAST” to minimum.Nota:(When using a high voltage meter resistive type, it isnecessary to use an electrostatic meter type to verify thevalues)14" SAMSUNG A34KQW42X 6,30 ± 0,25 Vrms14" PHILIPS A34EAK01X 6,15 ± 0,25 Vrms20" SAMSUNG A48KRDB89X 6,30 ± 0,25 Vrms20" PHILIPS A48EAK01X 6,15 ± 0,25 VrmsCRT [A]14” 25,2 ~ 23,020” 27,2 ~ 25,0smaller than500 m Vp-p