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Sony XR-4890 Service Manual
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Sony XR-4890 Service Manual

Sony XR-4890 Service Manual

Fm/am cassette car stereo
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XR-4890
SERVICE MANUAL
US Model
Canadian Model
Photo: XR-4890
Model Name Using Similar Mechanism
XR-C5100
Tape Transport Mechanism Type
MG-25F-136
SPECIFICATIONS
– Continued on next page –
FM/AM CASSETTE CAR STEREO
MICROFILM

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Summary of Contents for Sony XR-4890

  • Page 1 XR-4890 SERVICE MANUAL US Model Canadian Model Photo: XR-4890 Model Name Using Similar Mechanism XR-C5100 Tape Transport Mechanism Type MG-25F-136 SPECIFICATIONS – Continued on next page – FM/AM CASSETTE CAR STEREO MICROFILM...

  • Page 2: Table Of Contents

    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 .... 11 MECHANICAL ADJUSTMENTS .......
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –...
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  • Page 9: 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 10 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) 1 three screws (PTT2.6 × 8) 5 two screws (PTT 2.6 ×...

  • Page 11: Assembly Of Mechanism Deck

    SECTION 3 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. 1 Install the catch to the hanger.
  • Page 12 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 GUIDE (C) 2 guide (C) 1 three claws MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901) 30 ° 3 Capstan/reel motor(M901) 2 Two precision screws (P 2 × 2) 1 Belt – 13 –...

  • Page 14: Mechanical Adjustments

    SECTION 5 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS 1. Clean the following parts with a denatured-alcohol-moistene 0 dB=0.775 V TAPE DECK SECTION swab: playback head pinch roller Tape Speed Adjustment rubber belt capstan Setting: idlers speed checker 2. Demagnetize the playback head with a head demagnetizer. 3.

  • Page 15: Diagrams

    SECTION 6 DIAGRAMS • IC Block Diagrams – MAIN Board – IC301 CXA2509AQ-T4 IC21 TB2118F (EL) IC351 LB1930M-TLM BUFFER 24dB 24 23 22 21 16 15 14 13 OUT1 MOTOR 120µ/70µ CONTROL DRIVE CIRCUIT CIRCUIT + – OUT2 MSMODE – BUFFER NR BIAS S-GND...

  • Page 16: Printed Wiring Board -Main Section

    XR-4890/4900 6-1. PRINTED WIRING BOARD — MAIN SECTION — • Semiconductor Location Ref. No. Location E-11 E-11 D351 I-12 D352 G-13 D501 D551 F-12 D552 F-12 D553 D554 F-12 D571 D-10 D572 D-10 D581 G-11 D588 D591 F-11 D601 J-13...

  • Page 17: Schematic Diagram -Main (1/2) Section

    XR-4890/4900 6-2. SCHEMATIC DIAGRAM — MAIN (1/2) SECTION — • Refer to page 15 for IC Block Diagrams. • Waveforms 2.8Vp-p 18.432MHz IC501 !™ OSC2 5.0Vp-p 32.768MHz IC501 !§ XO Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 18: Schematic Diagram -Main (2/2) Section

    XR-4890/4900 6-3. SCHEMATIC DIAGRAM — MAIN (2/2) SECTION — • Refer to page 15 for IC Block Diagrams. (Page 19, 20) Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 19: Printed Wiring Board -Panel Section

    XR-4890/4900 6-4. PRINTED WIRING BOARD — PANEL SECTION — • Semiconductor Location Ref. No. Location D902 B-12 D903 B-12 D904 B-11 D951 Q945 (Page 17) • Semiconductor Location Note: Ref. No. Location • X : parts extracted from the component side.

  • Page 20: Schematic Diagram -Panel Section

    6-4. SCHEMATIC DIAGRAM — PANEL SECTION — (Page 22) Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF • Power voltage is dc 14.4V and fed with regulated dc power • Voltages are taken with a VOM (Input impedance 10 MΩ). •...

  • Page 21: Ic Pin Function Description

    6-6. IC PIN FUNCTION DESCRIPTION • IC501 MASTER U-COM (MN101C12GTA1/MN101C12GTB) Pin No. Pin Name Function AVREF- – Basic voltage (- side) of AD conversion input FM/AM common signal meter A/D conversion input terminal KEYIN1 KEY (AD conversion) input KEYIN0 DBAS IN Position detecting AD input terminal of D-BASS DSTSEL Terminal for setting to select the value of destination...
  • Page 22 Pin No. Pin Name Function Not used AMSON “L” is output in AMS mode NROUT 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 23: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: The components identified by • The mechanical parts with no reference number in • -XX, -X mean standardized parts, so they may have mark ! or dotted line with mark the exploded views are not supplied. some difference from the original one.
  • Page 24 (2) FRONT PANEL SECTION not supplied (KEY board) LCD901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-030-838-01 BUTTON (RELEASE) * 62 3-030-824-01 PLATE, LIGHT GUIDE 3-030-832-01 LEVER (S/A) 1-694-508-11 CONDUCTIVE BOARD, CONNECTION 3-932-475-01 SPRING (RELEASE) * 64 3-030-825-01 HOLDER (LCD) 3-030-834-01 BUTTON (M/S)
  • Page 25 (3) MECHANISM DECK SECTION (MG-25F-136) HP901 M901 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 3-020-540-01 SPRING (LD-2), TENSION A-3301-267-A CHASSIS, ASSY (G)

  • Page 26: Electrical Parts List

    SECTION 8 ELECTRICAL PARTS LIST Note: • SEMICONDUCTORS • Due to standardization, replacements in the parts list The components identified by In each case, u: µ , for example: may be different from the parts specified in the mark ! or dotted line with mark diagrams or the components used on the set.
  • Page 27 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R990 1-216-295-00 SHORT C101 1-163-263-11 CERAMIC CHIP 330PF R991 1-216-295-00 SHORT C102 1-163-263-11 CERAMIC CHIP 330PF R999 1-216-295-00 SHORT C103 1-163-021-11 CERAMIC CHIP 0.01uF < ROTARY ENCODER > C104 1-164-489-11 CERAMIC CHIP 0.22uF...
  • Page 28 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C351 1-165-319-11 CERAMIC CHIP 0.1uF < DIODE > C352 1-165-319-11 CERAMIC CHIP 0.1uF C353 1-163-021-11 CERAMIC CHIP 0.01uF 8-719-991-65 DIODE SB02W03C C354 1-124-233-11 ELECT 10uF 8-719-158-15 DIODE RD5.6S-B C355 1-124-234-00 ELECT 22uF...
  • Page 29 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JACK > < JUMPER RESISTOR > 1-764-808-21 JACK (ANT) 7-685-793-09 SCREW +PTT 2.6X8 (S) J331 1-774-698-11 JACK, PIN 2P 7-685-793-09 SCREW +PTT 2.6X8 (S) J561 1-566-822-41 JACK <...
  • Page 30 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-025-00 RES,CHIP 1/10W R504 1-216-049-11 RES,CHIP 1/10W 1-216-049-11 RES,CHIP 1/10W R505 1-216-049-11 RES,CHIP 1/10W R506 1-216-049-11 RES,CHIP 1/10W 1-216-298-00 METAL CHIP 1/10W R507 1-249-417-11 CARBON 1/4W F 1-216-073-00 METAL CHIP 1/10W R508...
  • Page 31 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R592 1-216-089-00 RES,CHIP 1/10W ACCESSORIES & PACKING MATERIALS R593 1-216-089-00 RES,CHIP 1/10W ******************************* R601 1-249-393-11 CARBON 1/4W F 3-865-814-11 MANUAL, INSTRUCTION (ENGLISH)(US) R602 1-249-395-11 CARBON 1/4W F 3-865-814-21 MANUAL, INSTRUCTION (FRENCH)(CND) R603 1-216-186-00 RES,CHIP...
  • Page 32 XR-4890 Sony Corporation 99A09212-1 Personal & Mobile Communication Company 9-926-405-31 Printed in Japan © 1999. 1 – 38 – Published by Quality Assurance Dept.

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