Panasonic TC-14RM12L P Service Manual

Panasonic TC-14RM12L P Service Manual Manual pdf 2 page image

- 2 -TC-14RM12LP/TC-14RM12LP(.)/ TC-20RA12LP/TC-20RA12LP(.)/TC-20RM12LP/TC-20RM12LP(.)General GuidelinesAn Isolation Transformer should always be used during the servicingof a receiver whose chassis is not isolated from the AC power line.Use a transformer of adequate power rating as this protects thetechnician from accidents resulting in personal injury from electricalshocks. It will also protect the Receiver from being damaged byaccidental shorting that may occur during servicing.When servicing, observe the original lead dress, especially in the highvoltage circuit. Replace all damaged parts (also parts that show signsof overheating.)Always Replace Protective Devices, such as fishpaper, isolationresistors and capacitors, and shields after servicing the Receiver. Useonly manufacturer’s recommended rating for fuses, circuit breakers,etc.High potentials are present when this Receiver is operating. Operationof the Receiver without the rear cover introduces danger from electricalshock. Servicing should not be performed by anyone who is notthoroughly familiar with the necessary precautions when servicinghigh-voltage equipment.Extreme care should be practiced when Handling the Picture Tube.Rough handling may cause it to implode due to atmospheric pressure(14.7 lbs per sq. in). Do not sick or scratch the glass or subject it to anyundue pressure. When handling, use safety goggles and heavy glovesfor protection. Discharge the picture tube by shorting the anode tochassis ground (not to the cabinet or to other mounting hardware).When discharging, connect cold ground (i.e. dag ground lead) to theanode with a well insulated wire or use a grounding probe.Avoid prolonged exposure at close range to unshielded areas of thepicture tube to prevent exposure to X-ray radiation.The Test Picture Tube used for servicing the chassis at the benchshould incorporate safety glass and magnetic shielding. The safetyglass provides shielding for the tube viewing area against X-ray radiationas well as implosion. The magnetic shield limits X-ray radiation aroundthe bell of the picture tube in addition to restricting magnetic effects.When using a picture tube test jig for service, ensure that the jig iscapable of handling 31kV 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 operate.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 with the manufacturer’s specified replacementparts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without manufacturer’s permission.!Warning !It is essential that these critical parts are replacedwith the manufacturer’s specified replacement partsto prevent X-ray radiation, shock, fire or other haz-ards.!ContentsABOUT LEAD FREE SOLDER (PBF) ........................................................ 3SUGGESTED PBF SOLDER .................................................................... 3HOW TO RECOGNIZE THAT PB FREE SOLDER IS USED ......................... 3OPERATING INSTRUCTIONS ................................................................... 4IC601 PINOUT ......................................................................................... 5IC601 PINOUT ......................................................................................... 6IC VOLTAGE TABLES ............................................................................. 6IC601 BLOCK DIAGRAM ........................................................................ 7GP41 CHASSIS FEATURE SUMMARY .................................................... 8SERVICE HINTS ...................................................................................... 9FACTORY MODE ADJUSTMENT (TC-14RM12LP, LP• / TC-20RM12LP, LP•/TC-20RA12LP, LP•) .............................................................................. 9HOW TO OPERATE THE CONTROLS IN THE SERVICE MODE 1 .............. 10HOW TO OPERATE THE CONTROLS IN THE SERVICE MODE 2 .............. 10HOW TO OPERATE THE CONTROLS IN THE SERVICE MODE 3 .............. 10HOW TO ACCESS THE MEMORY MAPS (TC-14RM12LP, LP• /TC-20RM12LP, LP• / TC-20RA12LP, LP• ............................................. 11TABLE A0 ............................................................................................. 11TABLE A2 ............................................................................................. 11TABLE A4 ............................................................................................. 12TABLE A6 ............................................................................................. 12TABLE A8 ............................................................................................. 13TABLE AA ............................................................................................. 13TABLE AC ............................................................................................. 14TABLE AE ............................................................................................. 14ADJUSTMENTS ....................................................................................... 15ADJUSTMENTS ................................................................................... 16ADJUSTMENTS ....................................................................................... 17ADJUSTMENTS ....................................................................................... 18ADJUSTMENTS ....................................................................................... 19SCHEMATICS DIAGRAMS ....................................................................... 20CRT P.C.B. .............................................................................................. 20MAIN P.C.B. SCHEMATIC DIAGRAM ...................................................... 21MAIN P.C.B. CIRCUIT LAYOUT ............................................................... 22SIGNAL WAVEFORM .............................................................................. 23EXPLODED VIEW .................................................................................... 26REPLACEMENT MECHANICAL PARTS LIST .......................................... 27REPLACEMENT ELECTRICAL PARTS LIST ............................................ 28