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Sony XR-4900 Service Manual

Fm/mw/sw cassette car stereo
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3 7 63 1515 0
SERVICE MANUAL
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L 13942296513
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MICROFILM
http://www.xiaoyu163.com
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u163
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http://www.xiaoyu163.com
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Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
Q Q
3
6 7
1 3
1 5
FM/MW/SW CASSETTE CAR STEREO
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XR-4900
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2 8
E Model
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8
2 9
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2 8
– Continued on next page –
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9 9
XR-C5100
MG-25F-136
9 9

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  Summary of Contents for Sony XR-4900

  • Page 1 XR-4900 3 7 63 1515 0 SERVICE MANUAL E Model Model Name Using Similar Mechanism XR-C5100 Tape Transport Mechanism Type MG-25F-136 SPECIFICATIONS L 13942296513 – Continued on next page – FM/MW/SW CASSETTE CAR STEREO u163 MICROFILM http://www.xiaoyu163.com...
  • Page 2: Table Of Contents

    http://www.xiaoyu163.com 3 7 63 1515 0 TABLE OF CONTENTS GENERAL Location of Controls ............3 Resetting the Unit ............4 Detaching the Front Panel ..........4 Setting the Clock ............. 4 Installation ............... 5 Connections ..............6 DISASSEMBLY ............9 ASSEMBLY OF MECHANISM DECK ....
  • Page 3 http://www.xiaoyu163.com SECTION 1 This section is extracted from instruction manual. GENERAL 3 7 63 1515 0 L 13942296513 u163 – 3 – http://www.xiaoyu163.com...
  • Page 4 http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 L 1 3 9 4 2 2 9 6 5 1 3 u 1 6 3 http://www.xiaoyu163.com...
  • Page 5 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 – 5 – http://www.xiaoyu163.com...
  • Page 6 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 – 6 – http://www.xiaoyu163.com...
  • Page 7 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 – 7 – http://www.xiaoyu163.com...
  • Page 8 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 – 8 – http://www.xiaoyu163.com...
  • Page 9: Disassembly

    http://www.xiaoyu163.com SECTION 2 DISASSEMBLY 3 7 63 1515 0 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 . L 13942296513 COVER ASS’Y 3 cover ass’y...
  • Page 10 http://www.xiaoyu163.com 3 7 63 1515 0 SUB PANEL, MECHANISM DECK (MG-25F-136) 5 screw (PTT2.6 × 6) 3 connector (CN351) 6 mechanism deck (MG-25F-136) 4 flexible flat cable (CN301) 2 sub panel 1 three screws (PTT2.6 × 8) L 13942296513 1 three screws (PTT2.6 ×...
  • Page 11: Assembly Of Mechanism Deck

    http://www.xiaoyu163.com SECTION 3 3 7 63 1515 0 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. 5 Fit projection on C part. HOUSING 7 Holder the hanger by bending the claw. 2 Install the hanger onto two claws of the housing.
  • Page 12 http://www.xiaoyu163.com 3 7 63 1515 0 LEVER (LDG-A) / (LDG-B) shaft A shaft A shaft B shaft B shaft C 1 Fit the lever (LDG-A) on shafts A – C and install it. 3 type-E stop ring 2.0 2 Fit the lever (LDG-B) on shafts A and B and install it.
  • Page 13 http://www.xiaoyu163.com 3 7 63 1515 0 GUIDE (C) 2 guide (C) 1 three claws L 13942296513 MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901) 30 ° 3 Capstan/reel motor(M901) 2 Two precision screws (P 2 × 2) u163 1 Belt – 13 – http://www.xiaoyu163.com...
  • Page 14: Mechanical Adjustments

    http://www.xiaoyu163.com SECTION 5 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS 3 7 63 1515 0 1. Clean the following parts with a denatured-alcohol-moistene TEST MODE swab: This set have the test mode function. In the test mode, FM Auto playback head pinch roller Scan/Stop Level and MW Auto Scan/Stop Level adjustments can rubber belt capstan...
  • Page 15: Tuner Section

    http://www.xiaoyu163.com 3 7 63 1515 0 FM Stereo Separation Adjustment TUNER SECTION 0 dB=1 µV Setting: [SOURCE] button: FM Cautions during repair FREQUENCY SELECT switch: FM200 k When the tuner unit is defective, replace it by a new one be- FM RF signal cause its internal block is difficult to repair.
  • Page 16 http://www.xiaoyu163.com 3 7 63 1515 0 MW Auto Scan/Stop Level Adjustment Make this adjustment after “FM Auto Scan/Stop Level Adjustment”. Setting: [SOURCE] button: MW FREQUENCY SELECT switch: MW10 k 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω...
  • Page 17 http://www.xiaoyu163.com 3 7 63 1515 0 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment TU 1 RV 1 MW Auto Scan/Stop Level Adjustment RV 2 FM Auto Scan/Stop Level Adjustment RV 4 FM Stereo Separation Adjustment L 13942296513 u163 –...
  • Page 18: Diagrams

    http://www.xiaoyu163.com SECTION 6 DIAGRAMS 3 7 63 1515 0 • Waveforms THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed 2.8Vp-p in each block.) For schematic diagrams. 18.432MHz Note: IC501 !™...
  • Page 19: Printed Wiring Board -Main Section

    XR-4900 3 7 6 3 1 5 1 5 0 6-1. PRINTED WIRING BOARD — MAIN SECTION — • Semiconductor Location Ref. No. Location F-11 E-11 D351 I-12 D352 G-13 D501 D551 F-12 D552 F-12 D553 D554 F-12 D571...
  • Page 20: Schematic Diagram -Main (1/2) Section

    XR-4900 3 7 6 3 1 5 1 5 0 6-2. SCHEMATIC DIAGRAM — MAIN (1/2) SECTION — • Refer to page 18 for Waveforms. • Refer to page 19 for Printed Wiring Board. • Refer to page 29 for IC Block Diagrams.
  • Page 21: Schematic Diagram -Main (2/2) Section

    XR-4900 3 7 6 3 1 5 1 5 0 6-3. SCHEMATIC DIAGRAM — MAIN (2/2) SECTION — • Refer to page 18 for Waveforms. • Refer to page 19 for Printed Wiring Board. • Refer to page 29 for IC Block Diagrams.
  • Page 22: Printed Wiring Board -Panel Section

    XR-4900 3 7 6 3 1 5 1 5 0 • Semiconductor 6-4. PRINTED WIRING BOARD — PANEL SECTION — Location Ref. No. Location D902 B-12 D903 B-12 D904 B-11 D951 Q945 1 3 9 4 2 2 9 6 5 1 3...
  • Page 23: Schematic Diagram -Panel Section

    XR-4900 3 7 6 3 1 5 1 5 0 6-5. SCHEMATIC DIAGRAM — PANEL SECTION — (Page 24) 1 3 9 4 2 2 9 6 5 1 3 w w w u 1 6 3 – 27 –...
  • Page 24 http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 • IC Block Diagrams – MAIN Board – IC301 CXA2509AQ-T4 IC21 TB2118F (EL) IC351 LB1930M-TLM BUFFER 24 23 22 21 16 15 14 13 24dB OUT1 MOTOR 120µ/70µ CONTROL DRIVE CIRCUIT CIRCUIT + –...
  • Page 25: Ic Pin Function Description

    http://www.xiaoyu163.com 3 7 63 1515 0 6-6. IC PIN FUNCTION DESCRIPTION • IC501 MASTER U-COM (MN101C12GTB1) Pin No. Pin Name Function VREF- – Basic voltage (- side) of AD conversion input FM/AM common signal meter A/D conversion input terminal KEYIN1 KEY (AD conversion) input KEYIN0 DBASS IN...
  • Page 26: Q Q 7. Exploded Views

    http://www.xiaoyu163.com 3 7 63 1515 0 Pin No. Pin Name Function Not used AMSON “L” is output in AMS mode N/R-OUT FOR/REV control output MTLON Metal control input/output TAPMUT Tape mute control output DOLON Dolby control input/output AMSIN Input to detect existence of song during AMS mode 57 to 75 Not used Combination stereo input and monaural output...
  • Page 27 http://www.xiaoyu163.com SECTION 7 EXPLODED VIEWS 3 7 63 1515 0 NOTE: • The mechanical parts with no reference number in • -XX, -X mean standardized parts, so they may have the exploded views are not supplied. some difference from the original one. •...
  • Page 28 http://www.xiaoyu163.com 3 7 63 1515 0 (2) FRONT PANEL SECTION not supplied (KEY board) LCD901 L 13942296513 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-030-838-01 BUTTON (RELEASE) * 61 3-030-839-01 SHEET (REFLECTOR) 3-030-832-01 LEVER (S/A) 3-932-475-01 SPRING (RELEASE) * 62 3-030-824-01 PLATE, LIGHT GUIDE...
  • Page 29 http://www.xiaoyu163.com 3 7 63 1515 0 (3) MECHANISM DECK SECTION (MG-25F-136) HP901 M901 L 13942296513 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3291-667-A CLUTCH (FR) ASSY 3-933-346-01 CATCHER 3-019-130-01 LEVER (LDG-A) 3-933-344-01 GUIDE (C) 3-019-131-01 LEVER (LDG-B) 3-014-798-01 SCREW (HEAD), SPECIAL 3-020-539-01 SPRING (LD-1), TENSION 3-364-151-01 WASHER...
  • Page 30: Electrical Parts List

    http://www.xiaoyu163.com SECTION 8 ELECTRICAL PARTS LIST 3 7 63 1515 0 Note: • SEMICONDUCTORS • Due to standardization, replacements in the parts list When indicating parts by reference In each case, u: µ , for example: may be different from the parts specified in the number, please include the board uA...: µ...
  • Page 31 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R991 1-216-295-00 SHORT 1-124-234-00 ELECT 22uF R999 1-216-295-00 SHORT 1-164-004-11 CERAMIC CHIP 0.1uF 1-124-234-00 ELECT 22uF < ROTARY ENCODER > 1-124-234-00 ELECT 22uF RE901 1-475-014-11 ENCODER, ROTARY...
  • Page 32 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C334 1-163-021-11 CERAMIC CHIP 0.01uF < CONNECTOR > C335 1-124-584-00 ELECT 100uF C336 1-163-809-11 CERAMIC CHIP 0.047uF CN301 1-766-260-11 CONNECTOR, FFC/FPC (ZIF) 7P C337 1-124-234-00 ELECT 22uF...
  • Page 33 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark IC351 8-759-527-33 IC LB1930M-TLM JC782 1-216-295-00 SHORT JC992 1-216-296-00 SHORT IC501 8-759-590-79 IC MN101C12GTB1 IC551 8-759-574-61 IC XC61AN4302MR < COIL > IC611 8-759-347-49 IC BA3918-V2 IC751...
  • Page 34 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-049-11 RES,CHIP 1/10W R506 1-216-049-11 RES,CHIP 1/10W 1-216-073-00 METAL CHIP 1/10W R507 1-249-417-11 CARBON 1/4W F R508 1-249-417-11 CARBON 1/4W F 1-216-049-11 RES,CHIP 1/10W R509...
  • Page 35 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R591 1-216-089-00 RES,CHIP 1/10W ACCESSORIES & PACKING MATERIALS R592 1-216-089-00 RES,CHIP 1/10W ******************************* R593 1-216-089-00 RES,CHIP 1/10W 3-865-814-41 MANUAL, INSTRUCTION R594 1-216-049-11 RES,CHIP 1/10W (ENGLISH, SPANISH, CHINESE)
  • Page 36 XR-4900 3 7 63 1515 0 L 13942296513 u163 Sony Corporation 99B097025-1 Personal & Mobile Communication Company 9-926-444-11 Printed in Singapore © 1999. 2 – 42 – Published by Quality Assurance Dept. http://www.xiaoyu163.com...