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Panasonic KX-TG8421HGN Service Manual

Also see for KX-TGA840FXN: Service manual

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Contents
  1. Table Of Contents
  2. Safety Precautions
  3. Discarding of P.C. Board
  4. Specifications
  5. Technical Descriptions
  6. Circuit Operation (Base Unit)
  7. power supply circuit
  8. Block Diagram (Handset)
  9. Circuit Operation (Handset)
  10. Circuit Operation (Charger Unit)
  11. Signal Route
  12. Controls
  13. Installation Instructions
  14. Operating Instructions
  15. answering system settings
  16. Registering a Handset to a Base Unit
  17. Copying Phonebook Entries
  18. Troubleshooting
  19. For Service Hint
  20. Service Mode
  21. Copying Phonebook Items when Repairing
  22. How to Clear User Setting
  23. Troubleshooting Guide
  24. check power
  25. charger unit
  26. check link
  27. check the rf part
  28. check handset transmission
  29. base unit
  30. Troubleshooting by Symptom (Base Unit and Charger Unit)
  31. Troubleshooting by Symptom (Handset)
  32. Disassembly and Assembly Instructions
  33. How to Replace the Handset LCD
  34. Measurements and Adjustments
  35. Adjustment Standard (Base Unit)
  36. Adjustment Standard (Charger Unit)
  37. The Setting Method of JIG (Handset)
  38. Adjustment Standard (Handset)
  39. Things to Do after Replacing IC or X'tal
  40. RF Specification
  41. How to Check the Handset Speaker or Receiver
  42. Miscellaneous
  43. CPU Data (Handset)
  44. How to Replace the Flat Package IC
  45. How to Replace the LLP (Leadless Leadframe Package) IC
  46. Diodes
  47. Schematic Diagram
  48. Schematic Diagram (Base Unit)
  49. Schematic Diagram (Base Unit_Operation)
  50. Schematic Diagram (Handset)
  51. Schematic Diagram (Charger Unit)
  52. Printed Circuit Board
  53. Circuit Board (Base Unit_Operation)
  54. Circuit Board (Handset)
  55. Circuit Board (Charger Unit)
  56. Exploded View and Replacement Parts List
  57. Cabinet and Electrical Parts (Handset)
  58. Cabinet and Electrical Parts (Charger Unit)
  59. Accessories and Packing Materials
  60. Replacement Part List
  61. accessories and packing materials
Panasonic KX-TG8421HGN Service Manual Manual pdf 82 page image
82KX-TG8421HGN/KX-TGA840FXN13.2. Schematic Diagram (Base Unit)3.0V2.5VTX _RFTX _RFRX _RFBeepBell signalGNDSPmSPpGND GNDGND*C505 NC*C502 NC*SW1NC12GNDNC*C501GND+3.0V100R75270k*R425UTXURXGNDANT_1ANT2NCC854ANT1GNDGNDANT_2GNDNCC850GND GND0R5110*R5420*R5160*RA5011234 56781kR760*R532ANT1_TP ANT2_TPGNDGNDGND1uC616GND+3.0VGNDAP1*CN5 .PARALLEL WIREGND10kR77R78 NCGND+2.5_CP1uC625*C503 NCNCC430GNDCL1 CL2GND 10pC811GND100nC808GNDGNDGNDPON1kR804RF_RXpRF_RXnGNDGNDGNDTXpGND10pC819220R806GNDTXnGNDPSEL3.3nC81410pC825VDD_PADRVTXON1kR803GND1PSET 2VCCS 3PI 4PIX7 PSEL8 POX9 PO10 VCC11GND5PRAMP6 PAONGNDGNDGNDRXON220R80710pC809GND47R805GND 10n*C421GNDGND10k*R424NC*C423GND*Q421VDD5GND100n*C422560*R426560*R427560*R4283.3k*R429GND10k*R135GND10R43010pC827GNDGNDC85910p10pC85510pC857100pC856100pC85810p*C14510p*C14610pC81210pC63010pC631GNDGND10100nC60CLKGND_C*Q24NC*C504 NCGNDNCC506+1.8VC837NCCN5-10CN5-9CN5-8CN5-7CN5-6CN5-5CN5-4CN5-3CN5-2CN5-11.5pC80327nL801DA802123DA80112310p*C51110p*C51210p*C51310p*C51410p*C51510p*C516C8532p1.8pC8041.8pC802Shield1 234563nL8023nL803GNDC8512p10pC8223.3pC8053.3pC8062.2pC8102.2pC813VDD4*C163NC10p*C51710p*C51810p*C519GNDC520NCGNDJTAG3pC860GND10pC861GND1.5*R861.5*R87220RA801234NC*R1322.2n*C1492.2n*C150GNDGND100pC823GND0.9pC8260.75pC820120R8020.5pC8341 *CE2 SO3 *WP4 VSS 5SI6SCK7*HOLD8VDD 1.5k*R8081.5k*R801SDA2SCL2TAM_CSnSPI_CLKTAM_WPKEY0KEY1ROW1ROW2KEY2ROW0LED1CHARGETAM_WPSPI_DISPI_DOSPI_DOTAM_CSnSPI_DISPI_CLKLow_RadLED2ROW1ROW2KEY0KEY1KEY2ROW0ROW0for TG8421/6421for TG6411/8411CP_OUT1=3.0VPow_AdjPre-matchingBalunBPFW 0.15mmL 22+/-4mm1st or 4th layerW 0.15mmL 22+/-4mm1st or 4th layerW 0.15mmL 22+/-4mm1st or 4th layerW 0.15mmL 5.0mm1st layerW 0.15mmL 5.0mm1st layerW 0.15mmL 20+/-2mm3rd layerW 0.15mmL 20+/-2mm3rd layerW 0.15mmL 20+/-1mm3rd layerW 0.125mmL 7.6mmGap 0.125mm1st layerW 0.15mmL 4.0mm x2 1st layerIC801*IC421(1)(2)(3)(4)(5)(7)(6)(8)(9)NC: No Components
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This manual is suitable for:
KX-TGA840FXNKX-TG8421HGN
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