Panasonic CT-20D12DF Service Manual
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Panasonic CT-20D12DF Service Manual

Panasonic CT-20D12DF Service Manual

Chassis ap391, bp391
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Service Manual
This supplement service manual is issued to add the modelss of the NA7DM family listed above to the main service
manual order No. MTNC010305C1 (CT-20D11E). Included in this supplement service manual are unique
characteristics and a complete parts list. Please file and use this simplified service manual together with main service
manual order No. MTNC010305C1
"WARNING! This Service Manual is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Productspoweredbyelectricityshouldbeservicedorrepairedonlybyexperiencedprofessionaltechnicians.Anyattempttoservice
or repair the product or products dealt with in this Service Manual by anyone else could result in serious injury or death."
The service technician is required to read and follow the "safety precautions" and "important safety notice" in this main manual.
Color Television
Simplified Manual
(NA7DM)
Panasonic
Models
CT-20G7DF
CT-20D12DF
Copyright 2002 by Matsushita Electric Corporation of
America. All rights reserved. Unauthorized copying
and distribution is a violation of law.
ORDER NO. MTNC020515A1
B1
Chassis
AP391
BP391

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Summary of Contents for Panasonic CT-20D12DF

  • Page 1 Models Chassis CT-20G7DF AP391 CT-20D12DF BP391 This supplement service manual is issued to add the modelss of the NA7DM family listed above to the main service manual order No. MTNC010305C1 (CT-20D11E). Included in this supplement service manual are unique characteristics and a complete parts list. Please file and use this simplified service manual together with main service manual order No.

  • Page 2: Important Safety Notice

    Important safety notice Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol and printed in BOLD TYPE on the replacement part list. It is essential that these critical parts are replaced with the manufacturer’s specified replacement part to prevent X-ray radiation, shock, fire or other hazards.

  • Page 3: Table Of Contents

    Important safety notice ....2 Safety precautions ....2 General guidelines .

  • Page 4: Service Notes

    Service notes Note: These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose.

  • Page 5: X-Ray Protection Circuit Check

    Service notes (continued) IMPORTANT: To protect against possible damage to Procedure: the solid state devices due to arcing or static discharge, 1. Connect receiver to isolator transformer. make certain that all ground wires and CTR DAG wire 2. Apply a monoscope pattern. are securely connected.

  • Page 6: Receiver Feature Table

    Receiver feature table FEATURE\MODEL CT-20G7DF CT-20D12DF Chassis No AP391 BP391 Family NA7DM Number of channels Menu language Eng/Span/Fr Closed Caption V-Chip 75 Ω input Remote Model number EUR501450 EUR511502 Picture tube type PANABLACK Picture tube Supplier SAMSUNG Comb Filter 2 DIG...

  • Page 7: Chasis Service Adjustment Procedures

    Chasis service adjustment procedures All service adjustments are factory preset and should not require adjustment unless controls and/or associated components are replaced. Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC801’s heat sink when the HOT ground symbol ( ) is used.

  • Page 8: Audio Signal Path Block Diagram

    Audio signal path block diagram Figure 3. Audio signal block diagram - 8 -...

  • Page 9: Video Signal Path Block Diagram

    Video signal path block diagram Figure 4. Video signal block diagram - 9 -...

  • Page 10: Parts List

    REPLACEMENT PARTS LIST Models: CT-20D12DF, CT-20G7DF Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 11 REPLACEMENT PARTS LIST Models: CT-20D12DF, CT-20G7DF Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 12 REPLACEMENT PARTS LIST Models: CT-20D12DF, CT-20G7DF Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 13 REPLACEMENT PARTS LIST Models: CT-20D12DF, CT-20G7DF Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 14 REPLACEMENT PARTS LIST Models: CT-20D12DF, CT-20G7DF Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 15 M018 UR50EC1190A Warning French, Label FCC) CT-20G7DF ASSY, CABINET FRONT BATTERY COVER, REMOTE CONTROL M019 UR51EC975A M011 TXFKY09FSER ( Cabinet Front, Badge Panasonic, Guide CT-20D12DF IR, Label X-Ray Warning) M020 TQB2AA0431-1 MANUAL, OWNERS CT-20D12DF M012 TAS2AA0012 SPEAKER 16-OHM 1.5W Description of abbreviations guide...
  • Page 16 Notes: IMPORTANT SAFETY NOTICE CHIP TRANSISTOR THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL LEAD DESIGNATION FEATURES THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE AND ELECTRICAL SHOCK HAZARDS. WHEN SERVICING ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A IN THE SCHEMATIC.
  • Page 17 Notas NOTA DE SEGURIDAD DIAGRAMAS ELÉCTRICOS INCLUYEN CARACTERÍSTICAS ESPECIALES MUY IMPORTANTES IDENTIFICACIÓN DE TERMINALES PARA TRANSISTORES EN CHIP PARA PROTECCIÓN CONTRA RAYOS-X, QUEMADURAS Y DESCARGAS ELÉCTRICAS. CUANDO SERVICIO IMPORTANTE USAR PARA REEMPLAZO COMPONENTES CRITICOS, SOLO PARTES ESPECIFICADAS POR EL FABRICANTES. LOS COMPONENTES CRITICOS ESTAN SEÑALADOS EN LOS DIAGRAMAS POR EL SIMBOLO NOTAS DE LOS DIAGRAMAS...
  • Page 18 A&C-Board Layout - 18 -...
  • Page 19 - 19 - A&C-Board Layout...
  • Page 20 A-Board CT-20G7DF - 20 -...
  • Page 21 - 21 - A-Board CT-20G7DF...
  • Page 22 - 22 - A-Board CT-20G7DF...
  • Page 23 - 23 - A-Board CT-20G7DF...
  • Page 24 - 24 - A-Board CT-20G7DF...
  • Page 25 A-Board CT-20D12DF - 24 -...
  • Page 26 - 25 - A-Board CT-20D12DF...
  • Page 27 - 26 - A-Board CT-20D12DF...
  • Page 28 - 27 - A-Board CT-20D12DF...
  • Page 29 - 28 - A-Board CT-20D12DF...
  • Page 30 C-Board schematic C-Board transistor voltages Q351 Q352 Q353 7.47 7.40 7.40 96.00 98.20 98.80 7.00 6.90 6.90 Q354 Q355 Q356 2.90 2.90 2.90 7.50 7.40 7.40 2.40 2.40 2.40 - 29 - C-Board schematic & transistor voltages...
  • Page 31 A-Board Waveforms (All Models -- Todos los Modelos) 1.3V p-p [20µs] 1.40V p-p [20µs] 28V p-p [5ms] 112V p-p [5ms] TPA5 (VIDEO) (B OUT) Q551-Collector H Out IC451-13 (PUMP-UP) A11-3 14.20MHz Xtal 9.20V p-p [20µs] 5.52V p-p [5ms] IC001 PIN 35 276V p-p [20µs] V IN IC001-44 (H PULSE)
  • Page 32 A-Board integrated circuit voltages IC001 IC002 IC451 IC2301 ..0.00 ..GND ..GND ..8.18 ..14.00 ..1.39 .
  • Page 33 ® Printed in USA K02052597PL0516...

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Ct-20g7df

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