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Sony ICF-C793 Service Manual

Fm/mw/lw pll synthesized clock radio
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See also: Operating Instructions
SERVICE MANUAL
Ver 1.0 1999. 02
MICROFILM
ICF-C793/C793L
Photo: ICF-C793L
SPECIFICATIONS
FM/AM PLL SYNTHESIZED CLOCK RADIO
FM/MW/LW PLL SYNTHESIZED CLOCK RADIO
US Model
Canadian Model
Australian Model
ICF-C793
AEP Model
ICF-C793/C793L
UK Model
ICF-C793L
ICF-C793
ICF-C793L

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  • Page 1 ICF-C793/C793L SERVICE MANUAL US Model Canadian Model Ver 1.0 1999. 02 Australian Model ICF-C793 AEP Model ICF-C793/C793L UK Model ICF-C793L Photo: ICF-C793L SPECIFICATIONS ICF-C793 FM/AM PLL SYNTHESIZED CLOCK RADIO ICF-C793L FM/MW/LW PLL SYNTHESIZED CLOCK RADIO MICROFILM...

  • Page 2: Table Of Contents

    10.76 MHz DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. – 2 –...

  • Page 3: General

    SECTION 1 This section is extracted from instruction manual. GENERAL LOCATION OF CONTROLS – 3 –...
  • Page 4 – 4 –...

  • Page 5: Disassembly

    SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 1 four screws (P3 × 14) CHASSIS ASS’Y 3 rear cabinet 4 connector (CN301) 7 chassis assy 5 Break the soldering of speaker lead. 6 button (DST) 2 claw 6 knob (brightness) 2 three claws...

  • Page 6: Electrical Adjustments

    Frequency Display Reading on Digital Voltmeter 530 kHz (531kHz *1) 2.65 V ± 0.1V [AM (MW/LW)*] 1,710 kHz * AM : ICF-C793 Confirmation Less than 10 V (9.5 V *1) (1,602 kHz *1) MW/LW : ICF-C793L Setting: AM (MW) TRACKING ADJUSTMENT Band switch: AM (MW/LW) Adjust for a maximum reading on level meter.
  • Page 7 Adjustment Location: – MAIN BOARD (Component Side) – – MAIN BOARD (Conductor Side) – TC4 LW VCO Voltage Adjustment * L5 AM (MW) VCO Voltage Adjustment L4 FM VCO Voltage Adjustment TP (SP+) TP (VT) TP (SP GND) TP (FM-IN) T1 AM IF L1-2 L1 (L1-1 * )

  • Page 8: Block Diagram

    ICF-C793/C793L SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAM L3, TC3 FM TRACKING • SIGNAL PATH FM RF : FM FM/AM FRONT-END, ANT1 FM/AM IF AMP, DET, AGC, AF AMP : AM (MW/LW) FM LEAD ANTENNA FM RF FM/AM 10.7MHz FE OUT IF IN B.P.F.

  • Page 10: Schematic Diagram

    ICF-C793/C793L 4-3. SCHEMATIC DIAGRAM • IC Block Diagrams – MAIN BOARD – IC1 CXA1019M FM FE DISCRIMINATOR FM IF AM FE AF POWER AMP TUNING METER AM IF DET AGC IC50 BU2614FS Note on Schematic Diagram: MAIN CONTROL PHASE • All capacitors are in µF unless otherwise noted. pF: µµF...

  • Page 14: Electrical Parts List

    SECTION 6 ALARM KEY MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark ! or dotted line with mark are seldom required for routine service. parts list may be different from the parts speci- ! are critical for safety.
  • Page 15 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C107 1-163-235-11 CERAMIC CHIP 22PF IC100 8-759-571-48 IC uPD753106GC-053-AB8 C108 1-163-235-11 CERAMIC CHIP 22PF IC101 8-759-580-04 IC S-80820ALUP-EAH-T2 C110 1-163-021-11 CERAMIC CHIP 0.01uF C111 1-163-021-11 CERAMIC CHIP 0.01uF <SHORT>...
  • Page 16 MAIN MAIN KEY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark <IC LINK> 1-216-065-00 RES, CHIP 4.7K 1/10W (C793L) PS301 1-533-588-11 LINK, IC (C793: AEP, AUS/C793L) R133 1-216-065-00 RES, CHIP 4.7K 1/10W R134 1-216-065-00 RES, CHIP 4.7K 1/10W <TRANSISTOR>...
  • Page 17 ICF-C793/C793L MAIN KEY TRANSFORMER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark S217 1-553-856-00 SWITCH, KEYBOARD (SNOOZE/DATA/SLEEP OFF) S218 1-553-856-00 SWITCH, KEYBOARD (2) ************************************************************* 1-671-842-11 TRANSFORMER BOARD ******************* 1-535-771-11 TERMINAL (C793: AEP, AUS/C793L) <CONNECTOR> * CN301 1-564-706-11 PIN, CONNECTOR (SMALL TYPE) 4P <TRANSFORMER>...
  • Page 18 ICF-C793/C793L SERVICE MANUAL US Model Canadian Model Ver 1.1 1999. 06 E Model Australian Model ICF-C793 AEP Model ICF-C793/C793L UK Model ICF-C793L Photo: ICF-C793L SPECIFICATIONS ICF-C793 FM/AM PLL SYNTHESIZED CLOCK RADIO ICF-C793L FM/MW/LW PLL SYNTHESIZED CLOCK RADIO MICROFILM...

  • Page 19: Printed Wiring Boards

    OPERATION. REPLACE THESE COMPONENTS WITH DE FONCTIONNEMENT. NE REMPLACER CES COM- SONY PARTS WHOSE PART NUMBERS APPEAR AS POSANTS QUE PAR DES PIÈCES SONY DONT LES SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- NUMÉROS SONT DONNÉS DANS CE MANUEL OU LISHED BY SONY.

  • Page 20: Servicing Notes

    SECTION 1 SERVICING NOTES • Discrimination of MAIN board HOW TO CHANGED THE CERAMIC FILTERS This model is used two ceramic filters of CF2 and CF3. – MAIN BOARD (Component Side) – You must used same type of color marked ceramic filters in order to meet same specifications.

  • Page 21: General

    SECTION 2 This section is extracted from instruction manual. GENERAL LOCATION OF CONTROLS – 4 –...
  • Page 22 – 5 –...

  • Page 23: Disassembly

    SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 1 four screws (P3 × 14) CHASSIS ASSY 3 rear cabinet 4 connector (CN301) 7 chassis assy 5 Break the soldering of speaker lead. 6 button (DST) 2 claw 6 knob (brightness) 2 three claws...

  • Page 24: Electrical Adjustments

    Frequency Display Reading on Digital Voltmeter 530 kHz (531kHz *1) 2.65 V ± 0.1V [AM (MW/LW)*] 1,710 kHz * AM : ICF-C793 Confirmation Less than 10 V (9.5 V *1) (1,602 kHz *1) MW/LW : ICF-C793L Setting: AM (MW) TRACKING ADJUSTMENT Band switch: AM (MW/LW) Adjust for a maximum reading on level meter.
  • Page 25 Adjustment Location: – MAIN BOARD (Component Side) – – MAIN BOARD (Conductor Side) – TC4 LW VCO Voltage Adjustment * L5 AM (MW) VCO Voltage Adjustment L4 FM VCO Voltage Adjustment TP (SP+) TP (VT) TP (SP GND) TP (FM-IN) T1 AM IF L1-2 L1 (L1-1 * )

  • Page 26: Diagrams

    ICF-C793/C793L SECTION 5 DIAGRAMS 5-1. BLOCK DIAGRAM 5-2. IC PIN FUNCTION DESCRIPTION L3, TC3 • MAIN BOARD IC100 µPD753106GC-053-AB8 (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL) FM TRACKING Pin No. Pin Name Description • SIGNAL PATH FM RF : FM 10.7MHz...

  • Page 27: Schematic Diagram

    ICF-C793/C793L 5-3. SCHEMATIC DIAGRAM • IC Block Diagrams • Waveforms – MAIN board – – MAIN board – IC1 CXA1019M 1 IC50 2 (X IN) 1 V/DIV, 10 µs/DIV FM FE 1.9 Vp-p DISCRIMINATOR FM IF AM FE AF POWER AMP 13.3 µ...

  • Page 30: Exploded Views

    SECTION 6 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by mark ! or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 31 (2) CHASSIS SECTION not supplied LCD100 not supplied ANT1 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 51 1-671-841-11 ALARM KEY BOARD * 56 1-671-840-11 MAIN KEY BOARD 3-032-464-01 HOLDER (LCD) 3-032-459-01 CHASSIS A-3663-208-A MAIN BOARD, COMPLETE (C793: US, CND) 3-919-268-01 KNOB (VOL) A-3663-266-A MAIN BOARD, COMPLETE (C793: AUS) 3-033-972-01 HOLDER, FERRITE-ROD ANTENNA...

  • Page 32: Electrical Parts List

    SECTION 7 ALARM KEY MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark ! or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 33 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C104 1-125-691-11 DOUBLE LAYER 0.022F 5.5V < IC > C107 1-163-235-11 CERAMIC CHIP 22PF 8-752-050-16 IC CXA1019M C108 1-163-235-11 CERAMIC CHIP 22PF IC50 8-759-188-85 IC BU2614FS C110 1-163-021-11 CERAMIC CHIP 0.01uF IC100...
  • Page 34 MAIN MAIN KEY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-406-545-11 COIL, AIR-CORE 1-216-029-00 METAL CHIP 1/10W 1-406-485-11 COIL (OSC) 1-216-029-00 METAL CHIP 1/10W 1-216-029-00 METAL CHIP 1/10W < LIQUID CRYSTAL DISPLAY > 1-216-182-00 RES, CHIP 1/8W 1-216-182-00 RES, CHIP 1/8W...

  • Page 35: Components Identified By Mark ! Or Dotted

    ICF-C793/C793L MAIN KEY TRANSFORMER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark S211 1-553-856-00 SWITCH, KEYBOARD (SLEEP, RADIO ON) S212 1-553-856-00 SWITCH, KEYBOARD (CLOCK) S213 1-553-856-00 SWITCH, KEYBOARD (+, TUNE/TIME SET) S214 1-553-856-00 SWITCH, KEYBOARD (–, TUNE/TIME SET)

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