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Sony ICF-SC1 Service Manual

Pll synthesized scanning receiver
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SERVICE MANUAL

Ver 1.0
1998.03
Circuit system :
Triple conversion superheterodyne
Frequency range :
25.000 – 1300.000MHz
(excluding cellular phone band : 823.980 – 849.020 MHz and
868.980 – 894.020 MHz)
Detection mode :
AM, NFM, WFM
7
Speaker : Approx. 36 mm (1
/
Power output :
150mW(at 10% harmonic distortion
@ jack (monaural minijack)
Output :
Power requirements :
DC 6V, four size AA (R6) batteries
External power source :
DC 6V
Dimensions :
Approx. 64 x 177 x 44.3 mm (w/h/d) (2
incl. projecting parts and controls, not including the helical
antenna and the belt holder
Mass :
Approx. 252g (8.9 oz)
Approx. 382g (13.5 oz) incl. alkaline batteries, helical
antenna, and the belt holder
MICROFILM
ICF-SC1/SC1PC
SPECIFICATIONS
inches) dia., 8 ohms
16
5
3
/
x 7 x 1
/
inches)
8
4
PLL SYNTHESIZED SCANNING RECEIVER
Supplied Accessories
AC power adaptor (1)
Earphone (1)
Belt holder (1)
Helical antenna (1)
Frequency guidebook (1)
CD-ROM (1) (ICF-SC1PC only)
Serial port connecting cable (1) (ICF-SC1PC only)
Clamp filter (1) (ICF-SC1PC only)
Design and specifications are subject to change without notice.
US Model

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Summary of Contents for Sony ICF-SC1

  • Page 1: Service Manual

    ICF-SC1/SC1PC SERVICE MANUAL US Model Ver 1.0 1998.03 SPECIFICATIONS Circuit system : Supplied Accessories Triple conversion superheterodyne AC power adaptor (1) Frequency range : Earphone (1) 25.000 – 1300.000MHz Belt holder (1) (excluding cellular phone band : 823.980 – 849.020 MHz and Helical antenna (1) 868.980 –...

  • Page 2: Table Of Contents

    COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: General

    SECTION 1 This section is extracted from GENERAL instruction manual. LOCATION AND FUNCTION OF CONTROLS FRONT – 3 –...
  • Page 4 SIDE/REAR DISPLAY – 4 –...
  • Page 5 – 5 –...
  • Page 6 – 6 –...
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  • Page 10: Disassembly

    SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. HELICAL ANTENNA REMOVAL Helical antenna 2-2. CABINET (REAR) ASSY REMOVAL 2 Screws 2 Screws Claw Cabinet (Rear) assy Battery case lid Claws Claws – 10 –...

  • Page 11: Microcomputer Board, If Board, Rf Board Removal

    2-3. MICROCOMPUTER BOARD, IF BOARD, RF BOARD REMOVAL 2 Remove solder IF board RF board 5 Screws 5 Screws 3 CN402 (22pin) Microcomputer board 1 Knob (VOL) Cabinet (Front) assy Coaxial connector 7 Remove solder !™ !¡ IF board !™ !º...

  • Page 12: Test Mode

    SECTION 3 TEST MODE Reading the S-Curve voltage for scan-stop S-Curve voltage write method The ICF-SC1 and SC1PC have a scan-stop function used to scan Signal input method using signal generator. for the correct frequency. 1. In NFM Scanning continues until the squelch turns off (when a signal is received).

  • Page 13: Electrical Adjustmens

    SECTION 4 ELECTRICAL ADJUSTMENTS IF BOARD (SINGLE) ADJUSTMENT Setting : trackig generator 1. 3rd local oscillator Adjustment Procedure : (1) Connect a spectrum analyzer to TP2. (2) Receive a 49.975MHz signal. (3) Adjust the CT401 so that the 3rd local oscillator = (GND) 44.5500MHz.
  • Page 14 Adjustmen Location : [RF BOARD] (Front side) TP10 [RF BOARD] (Rear side) CT303 CT301 CT305 ANT IN (BNC connector) CT304 CT302 T206 CT203 CT201 CT202 T205 [ IF BOARD] (Rear side) RV401 CT401 RV403 RV403 center tap CT402 (COMMON) – 14 –...

  • Page 15: Diagrams

    SECTION 5 DIAGRAMS 5-1. EXPLANATION OF IC TERMINALS IC604 µ PD78064BGC (SYSTEM CONTROL) Pin No. Pin name Description COMP-W WFM S-curve voltage input (A/D input). BATT Low battery voltage detection input (A/D input). 3 – 7 KS0 – 4 Key matrix output. AVDD –...
  • Page 16 Pin No. Pin name Description L-DET PLL lock detect. “L” : Lock N-DET Squelch detection input. “L” : RTS input from RS232C interface. CONNECT PC connect check signal input. REMOTE PC connect check signal input. – Not used (Open). – Not used (Open).

  • Page 17: Block Diagram

    ICF-SC1/SC1PC 5-2. BLOCK DIAGRAM • Signal path. – 17 – – 18 –...

  • Page 18: Schematic Diagram - If Section

    ICF-SC1/SC1PC 5-4. SCHEMATIC DIAGRAM – IF SECTION – Refer to page 33 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF • Voltages are taken with a VOM (Input impedance 10 MΩ). 50 WV or less are not indicated except for electrolytics Voltage variations may be noted due to normal produc- and tantalums.

  • Page 19: Schematic Diagram - Microcomputer Section

    ICF-SC1/SC1PC 5-6. SCHEMATIC DIAGRAM – MICROCOMPUTER SECTION – Refer to page 33 for IC Block Diagrams. WAVEFORMS Note: • All capacitors are in µF unless otherwise noted. pF: µµF • Voltages are taken with a VOM (Input impedance 10 MΩ).

  • Page 20: Schematic Diagram - Rf Section (1/2)

    ICF-SC1/SC1PC 5-8. SCHEMATIC DIAGRAM – RF SECTION (1/2) – Refer to page 33 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 21: Schematic Diagram - Rf Section (2/2)

    ICF-SC1/SC1PC 5-9. SCHEMATIC DIAGRAM – RF SECTION (2/2) – Refer to page 33 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 22: Ic Block Diagrams

    IC BLOCK DIAGRAMS IC301 MB1511-PFV-EF 20 19 18 CONTROL PHASE MONITOR FREQUENCY 1BIT COMPARATPR SELECT CIRCUIT ANALOG LATCH SWITCH SWITCH BINARY 11BIT PROGRAMABLE COUNTER BINARY 14BIT CONTROL 15BIT 16BIT 19BIT 18BIT REFERENCE CIRCUIT LATCH SIFT RESISTER SIFT RESISTER LATCH COUNTER BINARY 7BIT SWALLOW COUNTER...
  • Page 23 IC607 µ PD4721GS-GJG-E2 (ICF-SC1PC) IC605 AT25160N-10SC2.7T2.5 CLOCK GENERATOR MEMORY ARRAY STATUS ADDRESS 1024/2048/ REGISTER DECODER 4096/8192X8 DATA REGISTER OUTPUT BUFFER MODE DECODE LOGIC – 34 –...

  • Page 24: Exploded View

    3-020-649-01 SHEET (SPEAKER) 3-020-631-01 GRILLE (SPEAKER) (SC1) 3-020-636-01 LUG (BNC) 3-020-631-11 GRILLE (SPEAKER) (SC1PC) 3-020-637-01 FRAME 3-020-635-01 RING (BNC) (SC1) 4-942-636-01 EMBLEM (NO.3.5), SONY 3-020-635-11 RING (BNC) (SC1PC) 3-907-103-11 SPRING, RING 1-784-075-11 CONNECTOR, COAXIAL (BNC TYPE) 3-020-641-01 KNOB (VOL) 3-020-629-01 BUTTON (POWER)

  • Page 25: Electrical Parts List

    SECTION 7 ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS In each case, u : µ , for example : The components identified by mark ! parts list may be different from the parts uA..
  • Page 26 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C484 1-162-927-11 CERAMIC CHIP 100PF < TRANSISTOR > C485 1-162-964-11 CERAMIC CHIP 0.001uF C486 1-162-964-11 CERAMIC CHIP 0.001uF Q401 8-729-117-72 TRANSISTOR 2SC4178-F13 C487 1-162-964-11 CERAMIC CHIP 0.001uF Q402 8-729-029-14 TRANSISTOR DTC144EUA-T106 Q403 8-729-823-86 TRANSISTOR 2SA1745...
  • Page 27 MICROCOMPUTER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R434 1-216-864-11 METAL CHIP 1/16W < VIBRATOR > R435 1-216-829-11 METAL CHIP 4.7K 1/16W R436 1-216-843-11 METAL CHIP 1/16W XF401 1-767-753-11 FILTER, CRYSTAL R437 1-216-797-11 METAL CHIP 1/16W XF402 1-767-753-11 FILTER, CRYSTAL...
  • Page 28 MICROCOMPUTER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C661 1-162-970-11 CERAMIC CHIP 0.01uF D612 8-719-017-94 DIODE MA8180 (SC1PC) (SC1PC) D613 8-719-017-94 DIODE MA8180 (SC1PC) C662 1-107-689-21 TANTAL. CHIP D614 8-719-017-94 DIODE MA8180 (SC1PC) (SC1PC) D615 8-719-017-94 DIODE MA8180 (SC1PC) C663 1-107-689-21 TANTAL.
  • Page 29 MICROCOMPUTER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R617 1-216-821-11 METAL CHIP 1/16W R674 1-216-841-11 METAL CHIP 1/16W (SC1PC) R618 1-218-723-11 METAL CHIP 0.50% 1/16W R675 1-216-841-11 METAL CHIP 1/16W R676 1-216-841-11 METAL CHIP 1/16W R619 1-218-723-11 METAL CHIP 0.50% 1/16W...
  • Page 30 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3679-950-A RF BOARD, COMPLETE C205 1-162-915-11 CERAMIC CHIP 10PF 0.5PF C206 1-162-964-11 CERAMIC CHIP 0.001uF ****************** < CAPACITOR > C207 1-162-927-11 CERAMIC CHIP 100PF C208 1-162-927-11 CERAMIC CHIP 100PF C101 1-162-970-11 CERAMIC CHIP...
  • Page 31 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C318 1-162-927-11 CERAMIC CHIP 100PF < TRIMMER > C319 1-162-927-11 CERAMIC CHIP 100PF C320 1-162-910-11 CERAMIC CHIP 0.25PF 50V CT201 1-141-325-11 CAP, CHIP TYPE TRIMMER 5PF C321 1-162-927-11 CERAMIC CHIP 100PF CT202 1-141-325-11 CAP, CHIP TYPE TRIMMER 5PF...
  • Page 32 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark L113 1-414-737-11 INDUCTOR 8.2NH R102 1-216-821-11 METAL CHIP 1/16W L114 1-414-723-11 INDUCTOR 15NH R103 1-216-821-11 METAL CHIP 1/16W L115 1-414-736-11 INDUCTOR 6.8NH R104 1-216-821-11 METAL CHIP 1/16W R105 1-216-821-11 METAL CHIP 1/16W L201...
  • Page 33 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R310 1-216-845-11 METAL CHIP 100K 1/16W R369 1-216-864-11 METAL CHIP 1/16W R311 1-216-797-11 METAL CHIP 1/16W R370 1-216-825-11 METAL CHIP 2.2K 1/16W R901 1-216-864-11 METAL CHIP 1/16W R312 1-216-821-11 METAL CHIP 1/16W R902...
  • Page 34 Ref. No. Part No. Description Remark ************* HARDWARE LIST ************* 7-685-534-14 SCREW +BTP 2.6X8 TYPE2 N-S 7-682-547-09 SCREW +B 3X6 7-685-649-79 SCREW +BTP 3X14 TYPE2 N-S – 45 –...
  • Page 35 ICF-SC1/SC1PC 98C0220-1 Sony Corporation Printed in Japan © 1998.3 Published by Quality Assurance Dept. 9-925-934-11 Personal & Mobile Communication Company – 46 –...

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