Panasonic TC-29G12P Service Manual

Panasonic TC-29G12P Service Manual Manual pdf 2 page image

- 2 -General 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 onlymanufacturerís 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 electricalshock. Servicing should not be performed by anyone who is not thoroughlyfamiliar with the necessary precautions when servicing high-voltageequipment.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 anodewith a 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 ofthe picture tube in addition to restricting magnetic effects. When using apicture tube test jig for service, ensure that the jig is capable of handling31kV without 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 manufacturerís specified replacementparts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design whitout manufacturerís permission.Warning !It is essential that these critical parts are replacedwith the manufacturerís specified replacement partsto prevent X-ray radiation, shock, fire or otherhazards.Table of ContentsOperation Guide ................................................................................. 03Service Adjustments and CalibrationsHow to enter into Service Mode .................................................... 17Electrical Inspection ............................................................................ 18Deflection Circuit Pre-Adjustments .................................................. 18AGC Circuit Adjustments ................................................................... 18White Balance Adjustments ................................................................ 18AFT adjustments ................................................................................ 19+B Voltage Confirmation ..................................................................... 19RF AGC Adjustments ......................................................................... 19IF Detector Output Adjustments ........................................................ 19Sub-Contrast Adjustments .................................................................. 19PAL Sub-Colour Adjustments ............................................................. 20NTSC Sub-Tint Adjustments .............................................................. 20Sub-Bright Pre-adjustments ................................................................ 20Audio Output Level Verification .......................................................... 21MTS Circuit Adjustments .................................................................... 21Hum Verification .................................................................................. 22Audio Output Check up ..................................................................... 22Synthetizer Adjustments ..................................................................... 22Deflection Circuit Checkup and Adjustment ...................................... 22CRT CUT OFF Adjustments ............................................................. 23White Balance Adjustments ................................................................ 23Color Killer Verification ....................................................................... 24Filament Voltage Check up ................................................................ 24Sub-Bright Adjustments ...................................................................... 24Focus adjustments ............................................................................. 24Audio Verification ................................................................................ 24AI Sound Verification .......................................................................... 24Purity and Convergence Adjustments ............................................... 25Standard DAC Table .......................................................................... 26Z Board Schematic Diagram ............................................................. 26Y Board Schematic Diagram ............................................................. 26A/C Board Schematic Diagram .......................................................... 27Waveform (IC001, IC401, IC601) ...................................................... 28IC001 - Pins and Functions ............................................................... 29IC601 - Pins and Functions ............................................................... 30A/C Board Components and Test Points ........................................... 31Cabinet Parts Location ....................................................................... 33Cabinet Replacement Parts List ........................................................ 34Electrical Replacement Parts List ...................................................... 35 HOW TO OPEN THE CABINETScrewScrew