Sony XR-4750RDS Service Manual
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Sony XR-4750RDS Service Manual

Fm/mw/lw cassette car stereo
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XR-4750RDS/C450RDS
SERVICE MANUAL
Ver 1.1 2001.06
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-S) previously issued.
Sony Corporation
9-925-542-12
2001F0500-1
e Vehicle Company
C 2001.6
Shinagawa Tec Service Manual Production Group
Photo: XR-C450RDS
Model Name Using Similar Mechanism
Tape Transport Mechanism Type

SPECIFICATIONS

FM/MW/LW CASSETTE CAR STEREO
AEP Model
UK Model
NEW
MG-25B-136

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  • Page 1 XR-4750RDS/C450RDS SERVICE MANUAL AEP Model UK Model Ver 1.1 2001.06 For RM-X2S (Remote Commander), Photo: XR-C450RDS please refer to RM-X2S/X3S Service Manual (9-960-039-S) previously issued. Model Name Using Similar Mechanism Tape Transport Mechanism Type MG-25B-136 SPECIFICATIONS FM/MW/LW CASSETTE CAR STEREO...
  • Page 2 TABLE OF CONTENTS SERVICING NOTES GENERAL Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270 ˚ C during Location of Controls ............3 Setting the Clock ............... 4 repairing. • Do not touch the soldering iron on the same conductor of the Using the Rotary Remote ..........
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –...
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  • Page 10 SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. FRONT PANEL ASS’Y 1 Push the button (release). 2 Remove the front panel ass’y to the direction of the arrow A . COVER ASS’Y 3 cover ass’y –...
  • Page 11 5 screw (PTT2.6 × 6) SUB PANEL, MECHANISM DECK (MG-25B-136) 3 connector (CN302) 6 mechanism deck (MG-25B-136) 4 flexible flat cable (CN301) 2 sub panel 1 three screws (PTT2.6 × 8) 1 three screws (PTT2.6 × 8) 4 eight screws (PTT2.6 ×...

  • Page 12: Assembly Of Mechanism Deck

    SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. HOUSING 7 Hold the hanger by bending the claw. 5 Fit projection on C part. 2 Install the hanger onto 1 Install the catch to the hanger. two claws of the housing.
  • Page 13 LEVER (LDG-A) / (LDG-B) shaft A shaft A shaft B shaft C shaft C 1 Fit the lever (LDG-A) on 4 type-E stop ring 2.0 shafts A – C and install it. 2 Pull the lever in the arrow direction. 3 Fit the lever (LDG-B) on shafts A and C and install it.
  • Page 14 GUIDE (C) 2 guide (C) 1 three claws – 14 –...

  • Page 15: Mechanical Adjustments

    SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS PRECAUTION TEST MODE This set have the test mode function. In the test mode, FM Auto 1. Clean the following parts with a denatured-alcohol-moistened Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments swab: can be performed easier than it in ordinary procedure.
  • Page 16 FM Stereo Separation Adjustment TUNER SECTION 0dB=1µV Setting: SOURCE button: FM Cautions during repair When the tuner unit is defective, replace it by a new one because FM RF signal level meter antenna jack (J1) generator its internal block is difficult to repair. 0.01 µ...
  • Page 17 FM Signal Meter Adjustment AM (MW) Auto Scan/Stop Level Adjustment Setting: Make this adjustment after “FM Auto Scan/Stop Level Adjustment”. SOURCE button: FM Setting: SOURCE button: MW FM RF signal generator 30 Ω 15 pF antenna jack (J1) 0.01 µ F 65 pF Carrier frequency : 98.00 MHz : 35 dB (56.2 µ...
  • Page 18 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment RV1 AM (MW) Auto Scan/Stop Level Adjustment RV2 FM Auto Scan/Stop Level Adjustment RV3 FM Noise Focus Adjustment RV4 FM Stereo Separation Adjustment FM Signal Meter Adjustment – 18 –...
  • Page 19 SECTION 6 DIAGRAMS • IC Block Diagrams –MAIN Section – IC1 TB2114F (EL) 24 23 21 20 14 13 RIPPLE FILTER – – SEEK/RECP SEEK/RECP 4BIT MODULAS SWALLOW COUNTER PRESCALER 12BIT PHASE PROGRAMABLE COMPARATOR COUNTER REFERENCE 40BIT 18BIT 20BIT COUNTER 22BIT SHIFT IF COUNTER...
  • Page 20 IC151 LC75373ED – LFIN – – – LFOUT – LSELO LROUT – – – VREF SHIFT DECODER LATCH CONTROL REGISTER – – – RROUT RSELO – RFOUT – – – – RFIN 6 7 8 9 10 IC351 CXA2509AQ-T4 IC360 MM1322XFBE 24dB 120µ/70µ...
  • Page 21 IC601 BA3918-V2 IC701 BA8270F-E2 (XR-C450RDS only) BUS ON BUS ON SWITCH REGULATOR RESET SWITCH BUS ON CLK IN BATTERY BATT BU IN SWITCH OVER VOLTAGE PROTECT VREF DATA IN DATA – DATA OUT 2 3 4 • Waveforms 1 IC1 1 XO 2 IC3 9 XO 42 mVp-p 5.1 Vp-p...
  • Page 22 6-5. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 MN1884820S4G (XR-4750RDS), MN1886426S4H (XR-C450RDS) (SYSTEM CONTROLLER) Pin No. Pin Name Function TUNMUT Tuner muting control pin At muting: “H” AMPON Power amp power supply control pin Illumination power supply control pin ILLON At PW SEL on: ACC on: “H”...
  • Page 23 – A/D reference voltage input pin AVSS – – BUSON BUS ON control signai output pin (for SONY BUS) (C450RDS only) SYSRST System reset signal output pin (C450RDS only) SEKOUT SEEK control signal output pin TUNON Tuner power supply control pin...

  • Page 24: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they • Abbreviation may have some difference from the original are seldom required for routine service. Some G: German one.
  • Page 25 3-009-304-01 BUTTON (RELEASE) 3-932-475-01 SPRING (RELEASE) 3-009-298-01 BUTTON (R) (PTY. AF/TA. – DISK +) (C450RDS) 3-009-314-01 BUTTON (R) (2) (PTY. AF/TS. –DISK+) (4750RDS) 3-904-194-01 EMBLEM (NO. 2.5), SONY (C450RDS) * 114 3-010-282-01 PLATE (LCD), GROUND X-3373-662-1 PANEL SUB ASSY (C450RDS)
  • Page 26 (3) MECHANISM DECK SECTION (MG-25B-136) HP901 M901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3291-667-A CLUTCH (FR) ASSY 3-008-874-02 CATCHER 3-701-437-21 WASHER 3-933-344-01 GUIDE (C) * 203 3-008-883-01 LEVER (LDG-A) 3-927-100-01 SCREW (+PS 2X10), SPECIAL * 204 3-008-884-01 LEVER (LDG-B) 3-364-151-01 WASHER...

  • Page 27: Electrical Parts List

    SECTION 8 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they • Abbreviation are seldom required for routine service. G: German parts list may be different from the parts speci- fied in the diagrams or the components used on Some delay should be anticipated when order- the set.
  • Page 28 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark LSW909 1-762-620-11 SWITCH, KEY BOARD (WITH LED) (DSPL) LSW928 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (PTY) (C450RDS) (4750RDS: GREEN) LSW928 1-762-620-11 SWITCH, KEY BOARD (WITH LED) (PTY) LSW910 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (MUTE) (C450RDS) (4750RDS: AMBER) LSW929 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (AF/TA)
  • Page 29 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R928 1-216-061-00 METAL CHIP 3.3K 1/10W R970 1-216-021-00 METAL CHIP 1/10W R929 1-216-065-00 METAL CHIP 4.7K 1/10W (C450RDS) R930 1-216-069-00 METAL CHIP 6.8K 1/10W (4750RDS) R971 1-216-029-00 METAL CHIP 1/10W (4750RDS: AMBER, C450RDS) R930...
  • Page 30 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-163-809-11 CERAMIC CHIP 0.047uF 10% C215 1-164-492-11 CERAMIC CHIP 0.15uF 1-124-463-00 ELECT 0.1uF C216 1-164-492-11 CERAMIC CHIP 0.15uF 1-164-232-11 CERAMIC CHIP 0.01uF C218 1-126-157-11 ELECT 10uF C219 1-126-157-11 ELECT 10uF 1-163-251-11 CERAMIC CHIP...
  • Page 31 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C605 1-126-157-11 ELECT 10uF D607 8-719-801-78 DIODE 1SS184 C606 1-126-157-11 ELECT 10uF D609 8-719-422-64 DIODE MA8062-M C607 1-126-157-11 ELECT 10uF D610 8-719-422-64 DIODE MA8062-M C609 1-124-589-11 ELECT 47uF D611 8-719-109-97 DIODE RD6.8ES-B2...
  • Page 32 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark JC14 1-216-295-00 CONDUCTOR, CHIP (2012) JC81 1-216-296-00 CONDUCTOR, CHIP (3216) JC15 1-216-295-00 CONDUCTOR, CHIP (2012) JC16 1-216-295-00 CONDUCTOR, CHIP (2012) < COIL > JC17 1-216-295-00 CONDUCTOR, CHIP (2012) 1-412-006-31 INDUCTOR, CHIP 10uH JC18...
  • Page 33 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R102 1-216-085-00 METAL CHIP 1/10W R505 1-216-049-00 METAL CHIP 1/10W R103 1-216-061-00 METAL CHIP 3.3K 1/10W R506 1-216-109-00 METAL CHIP 330K 1/10W R104 1-216-190-00 METAL CHIP 1/8W R507 1-216-198-00 METAL CHIP 1/8W...

  • Page 34: Main Power

    MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R583 1-216-166-00 METAL CHIP 1/8W < VIBRATOR > R584 1-216-238-00 METAL CHIP 1/8W R585 1-216-097-00 METAL CHIP 100K 1/10W 1-567-848-11 VIBRATOR, CRYSTAL (7.2MHz) R599 1-216-295-00 CONDUCTOR, CHIP (2012) 1-579-242-41 VIBRATOR, CRYSTAL (4.332MHz) R601...
  • Page 35 POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-859-488-21 MANUAL, INSTRUCTION, INSTALL R803 1-216-049-00 METAL CHIP 1/10W (FRENCH, GERMAN, DUTCH, ITALIAN) R804 1-216-049-00 METAL CHIP 1/10W (4750RDS: AEP, G) R811 1-216-296-00 CONDUCTOR, CHIP (3216) X-3373-412-1 CASE (PANNEL) ASSY (for FRONT PANEL) ************************************************************ R812 1-216-296-00 CONDUCTOR, CHIP...
  • Page 36 XR-4750RDS/C450RDS AEP Model UK Model SERVICE MANUAL Ver 1.1 2001.06 SUPPLEMENT-1 File this supplement with the service manual. Subject: MAIN Board Modification (SPM-01012) In this set, following board has been changed in the midway of production. NEW/FORMER TYPE DISCRIMINATION – MAIN Board (Component Side) –...
  • Page 37 XR-4750RDS/C450RDS DIAGRAMS 2-1. NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. pF: µµF •...
  • Page 38 • Semiconductor Location (C450RDS) Ref. No. Location (C450RDS) CN701 CNJ150 BUS CONTROL IN BUS AUDIO LINE OUT (FOR SONY BUS) REAR G-14 (ORIGINAL SERVICE MANUAL Page 24) (ORIGINAL SERVICE MANUAL Page 24) D150 POWER BOARD POWER BOARD D151 CN803 CN802...
  • Page 39 XR-4750RDS/C450RDS 2-3. SCHEMATIC DIAGRAM – MAIN Board (1/3) – (C450RDS) FM/AM TUNER UNIT CNJ150 BUS AUDIO IN LINE OUT REAR C124 R118 R151 C151 C153 25V 3.3k 4.7k 0.47 0.022 R119 C123 C122 C222 C103 R101 C102 C152 100p 100p...
  • Page 40 XR-4750RDS/C450RDS 2-4. SCHEMATIC DIAGRAM – MAIN Board (2/3) – (Page 4) C408 C308 R408 JC58 R351 R305 C305 R307 C309 330k 0.22 2.2k 1000p C410 2200p R303 R308 C310 JC18 2200p JC17 R304 HP901 R407 (PLAYBACK) 2.2k R306 C304 0.01...
  • Page 41 C701 R702 D605 C610 R607 470k BATTERY MA8056-M CHECK D701 D702 MA8180-M DTZ7.5C R603 C612 (C450RDS) CN701 BUS CONTROL IN (FOR SONY BUS) R708 JC33 R704 UNISI 100k UNISO JC34 BUS.ON B.DATA UNICLK B.CLK BUSON JC35 JC79 D703 MA8062-H R705...
  • Page 42 XR-4750RDS/C450RDS MAIN 3. ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they When indicating parts by reference number, please include the board. parts list may be different from the parts speci- are seldom required for routine service.
  • Page 43 XR-4750RDS/C450RDS MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C302 1-163-263-11 CERAMIC CHIP 330PF C704 1-164-004-11 CERAMIC CHIP 0.1uF C303 1-163-263-11 CERAMIC CHIP 330PF (C450RDS) C304 1-163-021-11 CERAMIC CHIP 0.01uF C305 1-164-489-11 CERAMIC CHIP 0.22uF <...
  • Page 44 XR-4750RDS/C450RDS MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D706 8-719-422-64 DIODE MA8062-M (C450RDS) JC59 1-216-296-00 CONDUCTOR, CHIP JC60 1-216-296-00 CONDUCTOR, CHIP < IC > JC62 1-216-296-00 CONDUCTOR, CHIP 8-759-448-88 IC TB2114F (EL) JC63 1-216-296-00 CONDUCTOR, CHIP...
  • Page 45 XR-4750RDS/C450RDS MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-017-00 METAL CHIP 1/10W R365 1-216-065-00 METAL CHIP 4.7K 1/10W R403 1-216-077-00 METAL CHIP 1/10W 1-216-077-00 METAL CHIP 1/10W 1-216-075-00 METAL CHIP 1/10W R404 1-216-081-00 METAL CHIP...
  • Page 46 XR-4750RDS/C450RDS MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R574 1-216-097-00 METAL CHIP 100K 1/10W X501 1-579-125-11 VIBRATOR, CERAMIC (8MHz) (4750RDS) X502 1-567-098-41 VIBRATOR, CRYSTAL (32.768kHz) R582 1-216-198-00 METAL CHIP 1/8W R583 1-216-166-00 METAL CHIP...
  • Page 47 XR-4750RDS/C450RDS REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2001.06...

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