Panasonic TC-20KL03A Service Manual

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Panasonic TC-20KL03A Service Manual Manual pdf 2 page image

- 2 -TC-20KL03A / TC-29KL03AGeneral GuidelinesAn Isolation Transformer should always be used during the servicing of areceiver whose chassis is not isolated from the AC power line. Use atransformer of adequate power rating as this protects the technician fromaccidents resulting in personal injury from electrical shocks. It will alsoprotect the Receiver from being damaged by accidental shorting that mayoccur during servicing.When servicing, observe the original lead dress, especially in the highvoltage circuit. Replace all damaged parts (also parts that show signs ofoverheating.)Always Replace Protective Devices, such as fishpaper, isolation resistorsand capacitors, and shields after servicing the Receiver. Use onlymanufacturers recommended rating for fuses, circuit breakers, etc.High potentials are present when this Receiver is operating. Operation ofthe Receiver without the rear cover introduces danger from electrical shock.Servicing should not be performed by anyone who is not thoroughly fami-liar with the necessary precautions when servicing high-voltage equipment.Extreme care should be practiced when Handling the Picture Tube. Roughhandling may cause it to implode due to atmospheric pressure (14.7 lbsper sq. in). Do not sick or scratch the glass or subject it to any unduepressure. When handling, use safety goggles and heavy gloves forprotection. Discharge the picture tube by shorting the anode to chassisground (not to the cabinet or to other mounting hardware). Whendischarging, connect cold ground (i.e. dag ground lead) to the anode witha well insulated wire or use a grounding probe.Avoid prolonged exposure at close range to unshielded areas of the picturetube to prevent exposure to X-ray radiation.The Test Picture Tube used for servicing the chassis at the bench shouldincorporate safety glass and magnetic shielding. The safety glass providesshieldinf for the tube viewing area against X-ray radiation as well asimplosion. The magnetic shield limits X-ray radiation around the bell of thepicture tube in addition to restricting magnetic effects. When using a picturetube test jig for service, ensure that the jig is capable of handling 31kVwithout causing X-ray radiation.Before returning a serviced receiver to the owner, the service technicianmust thoroughly test the unit to ensure that is completely safe to operatore.Do not use a line isolation transformer when testing.Important Safety NoticeSpecial components are used in this television set which are important for safety. These parts are identified on the schematicdiagram by the symbol . It is essential that these critical parts are replaced whit the manufacturers specified replacementparts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design whitout manufacturers permission.Warning !It is essential that these critical parts are replaced withthe manufacturers specified replacement parts to pre-vent X-ray radiation, shock, fire or other hazards.Table of ContentsOperating Instructions ........................................................................... 049eature Summary ................................................................................... 05The DAC Control 9unctions and Adjustments for MX5ZB .................... 06SERVICE MODE:CHK1 - Options ................................................................................ 06CHK2 - VCJ Adjustments ................................................................ 07CHK3 - Pincushion Adjustments ..................................................... 07CHK4 - White Balance Adjustments ............................................... 07CHK5 - Stereo Adjustments ........................................................... 07ADJUSTMENTS:TEST AND MEASUREMENT EQUIPMENTS ........................................ 081- R9 AGC CALIBRATION .............................................................. 092- VI9 DETECTOR OUTPUT LEVEL CON9IRMATION ................ 093- BUZZING CON9IRMATION (AUDIO CIRCUIT) ......................... 094- ANODE AND HEATER VOLTAGE CON9IRMATION ............... 095- PAL COLOR OUTPUT LEVEL ADJUSTMENT ............................ 106- NTSC SUB-TINT CALIBRATION ................................................... 107- MTS CALIBRATION ........................................................................ 108- STEREO SEPARATING ADJUSTMENT ..................................... 119- PROTECTION CIRCUIT (SHUTDOWN) OPERATION .............. 1110- 9OCUS CALIBRATION ............................................................. 1111- VERTICAL DE9LECTION CALIBRATION .................................. 1212- CRT CUT O99 CALIBRATION ................................................. 12EEPROM MEMORY MAPS ....................................................................... 13SCHEMATICS DIAGRAMS:CRT BOARD (L) ........................................................................................ 15DVD CONECTION BOARD (D) ................................................................ 16AV 9RONTAL BOARD (G) ....................................................................... 17REMOTE CONTROL RECEIVER (R) ...................................................... 17MAI BOARD:Power Supply ........................................................................................... 18Microprocessor / YUV / Syntony ............................................................ 20Audio Signal Process .............................................................................. 22Vertical / Horizontal Process .................................................................. 24Audio Output ............................................................................................ 26CIRCUIT BOARD LAYOUT ....................................................................... 28IC601 - Voltage and Description ............................................................... 30IC601 - Layout ............................................................................................ 31IC2201 - Voltage Table .............................................................................. 31Signal Waveform ........................................................................................ 32Exploded View ........................................................................................ 34Mechanical Replacement Parts List ....................................................... 35Electrical Replacement Parts List .......................................................... 36