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Sony XR-3750 Service Manual

Fm/mw/lw cassette car stereo
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SERVICE MANUAL
Refer to RM-X2S/X3S SERVICE MANUAL (9-960-039-∏)
issued previously for information of remote commander
(RM-X2S) supplied with XR-C350.
MICROFILM
XR-3750/C350
Photo: XR-C350
SPECIFICATIONS
FM/MW/LW CASSETTE CAR STEREO
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
AEP Model
UK Model
NEW
MG-52A-135

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Summary of Contents for Sony XR-3750

  • Page 1 XR-3750/C350 SERVICE MANUAL AEP Model UK Model Photo: XR-C350 Refer to RM-X2S/X3S SERVICE MANUAL (9-960-039-∏) issued previously for information of remote commander (RM-X2S) supplied with XR-C350. Model Name Using Similar Mechanism Tape Transport Mechanism Type MG-52A-135 SPECIFICATIONS FM/MW/LW CASSETTE CAR STEREO...

  • Page 2: Table Of Contents

    GENERAL Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270 ˚ C dur- Location of Controls (XR-3750) ........3 Location of Controls (XR-C350) ........4 ing repairing. • Do not touch the soldering iron on the same conductor of the Installation ...............
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –...
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  • Page 10: Disassembly

    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 heat sink 2 two ground point 4 screw (PTT2.6 × 8) screws (XR-C350 only) 3 main board 4 six screws PTT2.6 × 8 : XR-C350   PTT2.6 × 10 : XR-3750 1 two screws (PTT2.6 × 8) – 11 –...

  • Page 12: Assembly Of Mechanism Deck

    SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. ALIGNMENT OF FRONT SWITCH 1 Align ¢ mark on the rotary switch hole the position shown in the figure. chassis (S) ass’y 2 Align hole in the gear (LDG-D) with the position shown in the figure.
  • Page 13 2 screw (PS2 × 4) CHASSIS (S) ASS’Y 2 screw (PS2 × 4) 1 chassis (S) ass’y LEVER (MODE) 1. Align ¢ mark on the rotary switch with hole in the lever (mode). 2. Fit on positions A , B and C and install the lever (mode).
  • Page 14 LEVER (PINCH SELECTION) 1 Align. 2 lever (pich selection) HEAD PLATE ASS’Y 5 step screw (HP) 5 step screw (HP) 3 Press the ATS lever. 2 Fit shaft in groove. 4 Position the head plate sub ass’y as shown in the figure. ATS lever 1 Fit in groove.
  • Page 15 LEVER (PINCH) ASS’Y 2 two polyethylene washers 1 Fit shaft of the lever (Pinch) ass’y in hole on the chassis (M) ass’y and install the lever (pinch) ass’y. shaft shaft shaft A 3 Install the spring (pinch press) to shaft A . Set the ends of spring to B and C .
  • Page 16 ARM (SUCTION) 2 Move the arm (suction) in the arrow direction and fit on projection. projection 1 Fit the arm (suction) on the shaft. LEVER (LDG-A) / (LDG-B) shaft A shaft A shaft B shaft C shaft B 1 Fit the lever (LDG-A) 3 two type-E stop ring 2.0 on shaft A –...
  • Page 17 GEAR (LDG-FT) 1 gear (LDG-A) 6 polyethylene washer 5 gear (LDG-FT) 2 tension spring (lever LDG) gear (LDG-D) hole 3 Move the lever (LDG-B) in the arrow direction. gear (LDG-A) gear (LDG-FB) 4 Align hole in the gear (LDG-D) with ¢...

  • Page 18: Mechanical Adjustments

    SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS 1. Clean the following parts with a denatured-alcohol-moistened TEST MODE swab: This set have the test mode function. In the test mode, FM Auto playback head pinch roller Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments erase head rubber belts can be performed easier than it in ordinary procedure.

  • Page 19: Tape Deck Section

    WS-48A antenna jack (J1) 10 k Ω (XR-C350) 0.01 µ F (3 kHz, 0 dB) 4 Ω (XR-3750) Carrier frequency : 98.0 MHz – : 22 dB (12.6 µ V) Output level Mode : mono LINE OUT (XR-C350) Modulation : 1 kHz, 22.5 kHz deviation (30%)
  • Page 20 FM RF signal level meter antenna jack (J1) generator 10 k Ω (XR-C350) 30 Ω 15 pF 0.01 µ F 4 Ω (XR-3750) 65 pF – AM RF signal Carrier frequency : 98.0 MHz LINE OUT (XR-C350) generator Output level : 70 dB (3.2 mV)
  • Page 21 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment RV1 AM (MW) Auto Scan/Stop Level Adjustment RV2 FM Auto Scan/Stop Level Adjustment RV4 FM Stereo Separation Adjustment – 21 –...

  • Page 22: Diagrams

    SECTION 6 DIAGRAMS 6-1. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 µPD17708GC-535-3B9 (SYSTEM CONTROL) Pin No. Pin Name Function ILLIN ILLIN signal detection pin POS3, POS2 Tape position detection pin POS0, POS1 Tape position detection pin TAPEON Tape power supply control pin CM_ON Capstan motor control pin LM_LOD...
  • Page 23 Data output pin (for SONY BUS) UNISI Data input pin (for SONY BUS) UNICKO Clock output pin (for SONY BUS) BUSON BUS ON control signai output pin (for SONY BUS) SYSRST System reset signal output pin VREG CPU regurator output pin –...
  • Page 27 • IC Block Diagrams IC301 CXA2509AQ-T4 IC361 MM1322XFBE 8 OUT2 120µ/ 70µ + – MSMODE – NR BIAS PBFB1 DRSW MODE PBRIN1 OUT1 TAPE/AUX TAPESW PBREF1 INSW TAPE EQ PBFIN1 NRSW MODE FWD/RVS PBGND MS ON/ DETECT – MSOUT PBFIN2 PBREF2 DGND PBRIN2...
  • Page 28 IC601 BA3918-V2 REGULATOR OVER VOLTAGE PROTECT – 2 3 4 IC701 BA8270F-E2 BUS ON BUS ON SWITCH RESET SWITCH BUS ON CLK IN BATTERY BATT BU IN SWITCH VREF DATA IN DATA DATA OUT – 38 –...

  • Page 29: Exploded Views

    * 15 A-3309-752-A CONNECTOR BOARD, COMPLETE (XR-C350) 3-011-295-01 INSULATOR (MAIN) (XR-C350) * 15 A-3309-913-A CONNECTOR BOARD, COMPLETE (XR-3750) A-3309-873-A MAIN BOARD, COMPLETE (XR-C350: GREEN) 1-782-092-11 CORD (WITH CONNECTOR) (POWER) A-3309-874-A MAIN BOARD, COMPLETE (XR-C350: AMBER) 1-782-093-11 CORD (WITH CONNECTOR) (SPEAKER)
  • Page 30 LCD901 1-801-586-11 DISPLAY PANEL, LIQUID CRYSTAL (XR-C350) 3-009-867-01 BUTTON (L) (3) (+ + ). SEEK AMS. LCD901 1-801-588-11 DISPLAY PANEL, LIQUID CRYSTAL (XR-3750) = 0 –. r . OFF. SEL. MUTE) (XR-3750) PL901 1-517-633-21 LAMP, PILOT (LCD BACK LIGHT) 3-009-308-01 BUTTON (1-3) (6. 1. 2. 3) (XR-C350)
  • Page 31 (3) MECHANISM DECK SECTION-1 (MG-52A-135) M901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-928-675-01 BELT (52) 3-933-346-01 CATCHER * 102 3-928-673-01 LEVER (LDG-A) 3-933-344-01 GUIDE (C) 3-928-674-01 LEVER (LDG-B) 3-341-753-11 WASHER, POLYETHYLENE 3-933-341-01 SPRING (LEVER LDG), TENSION 3-933-335-01 GEAR (LDG-FT) 3-928-671-01 HOUSING 3-928-667-01 GEAR (LDG-A)
  • Page 32 (4) MECHANISM DECK SECTION-2 (MG-52A-135) HP901 S901 supplied supplied M902 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3371-710-1 CHASSIS (S) ASSY * 166 X-3371-712-1 PLATE SUB ASSY, HEAD 3-933-337-01 SPRING (B-T-R), CONE COIL 3-364-151-01 WASHER 3-701-437-01 POLY-SLIDER (A) * 168 X-3371-701-1 CHASSIS (M) SUB ASSY (A)

  • Page 33: Electrical Parts List

    R801 1-249-417-11 CARBON 1/4W LCD901 1-801-586-11 DISPLAY PANEL, LIQUID CRYSTAL (XR-C350) R802 1-249-417-11 CARBON 1/4W LCD901 1-801-588-11 DISPLAY PANEL, LIQUID CRYSTAL (XR-3750) R803 1-247-855-11 CARBON 1/4W < SWITCH > < SWITCH > LSW901 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (OFF)
  • Page 34 LSW907 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (SEL) (GREEN) LSW930 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (DSPL) LSW908 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (+) (XR-3750: GREEN) (AMBER) < PILOT LAMP > LSW908 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (+)
  • Page 35 1-163-227-11 CERAMIC CHIP 10PF 0.5PF 50V 7-685-793-09 SCREW +PTT 2.6X8 (S) (XR-C350) C192 1-163-227-11 CERAMIC CHIP 10PF 0.5PF 50V 7-685-794-09 SCREW +PTT 2.6X10 (S) (XR-3750) C193 1-163-227-11 CERAMIC CHIP 10PF 0.5PF 50V < CAPACITOR > C201 1-163-263-11 CERAMIC CHIP 330PF...
  • Page 36 20% 16V C355 1-124-234-00 ELECT 22uF 20% 16V CN301 1-766-260-11 CONNECTOR, FFC/FPC (ZIF) 7P (XR-C350) CN301 1-766-269-11 PIN, CONNECTOR (PC BOARD) 7P (XR-3750) C356 1-126-934-11 ELECT 220uF 20% 16V * CN351 1-506-995-11 PIN, CONNECTOR (PC BOARD) 13P C362 1-163-038-00 CERAMIC CHIP 0.1uF...
  • Page 37 Q604 8-729-900-53 TRANSISTOR DTC114EK D858 8-719-921-54 DIODE MTZJ-6.2B Q701 8-729-900-53 TRANSISTOR DTC114EK D859 8-719-921-54 DIODE MTZJ-6.2B Q702 8-729-900-53 TRANSISTOR DTC114EK (XR-3750) < IC > Q703 8-729-120-28 TRANSISTOR 2SC1623-L5L6 Q704 8-729-027-23 TRANSISTOR DTA114EKA-T146 (XR-3750) IC301 8-752-079-78 IC CXA2509AQ-T4 IC361 8-759-395-97 IC MM1322XFBE <...
  • Page 38 R304 1-216-079-00 METAL CHIP 1/10W R305 1-216-073-11 METAL CHIP 1/10W R570 1-216-097-00 METAL CHIP 100K 1/10W R306 1-216-073-11 METAL CHIP 1/10W (XR-C350: AMBER/XR-3750) R307 1-249-429-11 CARBON 1/4W R571 1-216-097-00 METAL CHIP 100K 1/10W R572 1-216-097-00 METAL CHIP 100K 1/10W R308...
  • Page 39 ACCESSORIES & PACKING MATERIALS R735 1-216-134-00 METAL CHIP 1/8W ******************************* R736 1-216-134-00 METAL CHIP 1/8W X-3373-371-1 CASE ASSY (for FRONT PANEL) (XR-3750) R745 1-216-134-00 METAL CHIP 1/8W X-3373-386-1 CASE ASSY (for FRONT PANEL) (XR-C350) R746 1-216-134-00 METAL CHIP 1/8W 1-473-067-31 REMOTE COMMANDER (RM-X2S) (XR-C350)
  • Page 40 Ref. No. Part No. Description Remark PARTS FOR INSTALLATION AND CONNECTIONS ************************************** 3-916-161-31 FRAME ASSY X-3370-077-1 SCREW ASSY (AE. KEY), FITTING (XR-3750) 3-386-828-01 SCREW, FITTING 3-349-410-01 BUSHING (XR-3750) * 504 3-358-697-01 BUSHING (XR-C350) 3-388-078-01 KEY (XR-3750) 3-909-731-01 KEY (XR-C350) 1-777-989-11 CORD (WITH CONNECTOR)

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