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Sony CDX-838 Service Manual

Compact disc changer
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Download this manual See also: Operating Instructions
SERVICE MANUAL
MICROFILM
CDX-838
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
COMPACT DISC CHANGER
US Model
Canadian Model
E Model
NEW
MG-250D-137
KSS-521A/J2N

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Summary of Contents for Sony CDX-838

  • Page 1 CDX-838 SERVICE MANUAL US Model Canadian Model E Model Model Name Using Similar Mechanism CD Drive Mechanism Type MG-250D-137 Optical Pick-up Name KSS-521A/J2N SPECIFICATIONS COMPACT DISC CHANGER MICROFILM...

  • Page 2: Table Of Contents

    SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES Magazine ass’y NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

  • Page 3: General

    SECTION 2 This section is extracted from instruction manual. GENERAL...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. COVER (UPPER.T) , FRONT PANEL (T) ASS’Y 1 screw 2 screw (PTT2.6 × 6) (BVTT2.6 × 6) 3 cover (upper.T) 4 lever (FL T) 1 screw 1 screw (PTT2.6 ×...
  • Page 7 JACK BOARD, DIGITAL OUT BOARD 2 connector (CN902) 5 connector (CN801) Remove the jack board in the direction of the arrow. 1 ground point screw (PTT2.6 × 6) 3 jack board 6 digital out board 4 screw (BVTT2 × 6) MAIN BOARD 1 main flexible board (CNJ12)
  • Page 8 ELEVATOR MOTOR ASS’Y (M104) 1 screw (PTT2 × 3) 2 bracket (EVM) 3 elevator motor ass’y (M104) ESCUTCHEON (T) 3 two claws 2 Remove the claw in the direction of the arrow A . 4 Remove the ditch in the direction of the arrow B . 5 Remove the escutcheon (T) in the direction of the arrow C .
  • Page 9 CASE (UPPER) ASS’Y 3 Remove the edge in the direction of the arrow A . 1 three screws (PTT2 × 4) 1 two screws (PTT2 × 4) 4 Remove the case (upper) ass’y in the direction of the arrow B . 1 screw (PTT2 ×...
  • Page 10 RF BOARD 1 OP flexible board 3 two screws (CNJ11) (PS2 × 4) 3 two screws (PS2 × 4) 7 RF board 5 connector (CNP53) 2 Break the soldering 6 Break the soldering of motor (M102) lead. of lead. SLED MOTOR ASS’Y (M102) , OPTICAL PICK-UP (KSS-521A/J2N) 1 two screws 2 sled motor ass’y (ESCUTCHEON)
  • Page 11 SW BOARD, SPINDLE MOTOR ASS’Y (M101) 8 two screws (P1.7 × 2.2) 3 spring (chucking) 6 retainer (disc) 1 screw (P2 × 2.2) 4 screw (P2 × 2.2) 5 bracket (CP) 9 Remove the spindle motor ass’y (M101) 2 SW board in the direction of the arrow.

  • Page 12: Mechanism Deck Assembly

    SECTION 4 MECHANISM DECK ASSEMBLY Note: Follow the assembly procedure in the numerical order given. OPTICAL PICK-UP COMPLETE ASS’Y 1 Move the lever (LOCK 3) in direction A , and return it a little in direction B from the position where the chuck plate is moved chuck plate down to the lower limit.
  • Page 13 OPERATION CHECK 1 Confirm that the slider moves in direction C to move down the chuck plate if the gear (LOAD CAM) is rotated in direction A or the chuck plate moves up and the slider moves in direction D if the gear is rotated in direction B .

  • Page 14: Mechanical Adjustments

    7. After adjustment at addresses 5 to 6 is finished, check all op- erations from addresses 1 to 10 with the set placed vertically and horizontally respectively to confirm that the elevator shaft CDX-838 positions in a range between comb teeth A to B. comb tooth at address 6...

  • Page 15: Electrical Adjustments

    SECTION 6 ELECTRICAL ADJUSTMENTS Note: • TRACKING OFFSET CHECK • FOCUS GAIN ADJUSTMENT • When gain is lowered... 1. Perform adjustments as given. (COARSE ADJUSTMENT) The set does not play because of no focus operation. 2. Power supply voltage: DC14.4 V (more than 3A). –...

  • Page 16: Diagrams

    CDX-838 SECTION 7 DIAGRAMS 7-1. BLOCK DIAGRAM – SERVO Section – DATA, PCMD, BCK, LRCK, WDCK D.OUT DATA DIGITAL DIGITAL SIGNAL PROCESSOR, FILTER (Page 17) CLV SERVO IC101 PD1 I-V AMP PCMD PCMD BCKO LRCK LRCK DETECTOR ASYMMETRY RFCK, GTOP, WFCK,...

  • Page 17: Block Diagram - Main Section

    CDX-838 7-2. 7-2. BLOCK DIAGRAM – MAIN Section – BLOCK DIAGRAM – MAIN Section – OPTICAL IC801 TRANSCEIVER DIGITAL OUT IC801 D-RAM CONTROLLER D/A CONVERTER IC601 IC401 CN901 (1/2) ANALOG OUT D OUT DIGITAL DATA, PCMD, BCK, LOW-PASS DATA AOUTL...

  • Page 18: Block Diagram - Bus Control/Power Supply Section

    MAGAZINE IN/OUT MAG.SW DETECT LOW-PASS FILTER REGULATOR (IC602) B+ IC306 CD.ON BU.CHK DAC +5V REGULATOR IC307 BUS INTERFACE D313 (FOR SONY BUS) B+ SWITCH ELEVATOR MOTOR DRIVE SERVO +5V REGULATOR B.UP IC302 Q305 IC301 IC305 DATA OUT1 ELV.R ELEVATOR M104...

  • Page 19: Note For Printed Wiring Boards And Schematic Diagrams

    • Circuit Boards Location 7-4. NOTE FOR PRINTED WIRING BOARDS 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 20: Printed Wiring Boards - Rf/Sw Boards

    CDX-838 7-5. PRINTED WIRING BOARDS – RF/SW Boards – • See page 19 for Circuit Boards Location. RF BOARD (COMPONENT SIDE) RF BOARD (CONDUCTOR SIDE) • Semiconductor Location Ref. No. Location IC11 IC51 CNJ12 IC52 IC51 RV14 M101 (SPINDLE) CNP53...

  • Page 21: Schematic Diagram - Rf/Sw Boards

    CDX-838 7-6. SCHEMATIC DIAGRAM – RF/SW Boards – • See page 27 for Waveforms. • See page 30 for IC Block Diagrams. (Page 24) The components identified by mark 0 or dotted Les composants identifiés par une marque 0 sont line with mark 0 are critical for safety.

  • Page 22: Printed Wiring Boards - Main Board (Component Side)

    CDX-838 7-7. PRINTED WIRING BOARDS – MAIN Board (Component Side) – • See page 19 for Circuit Boards Location. • Semiconductor Location (Component Side) MAIN BOARD (COMPONENT SIDE) Ref. No. Location C322 IC403 R110 D301 R102 IC307 D302 C107 C102...

  • Page 23: Main Board (Conductor Side)

    CDX-838 7-8. PRINTED WIRING BOARD – MAIN Board (Conductor Side) – • See page 19 for Circuit Boards Location. • Semiconductor Location (Conductor Side) MAIN BOARD (CONDUCTOR SIDE) Ref. No. Location IC303 G-10 IC305 E-10 C321 Q303 Q305 D-10 (CHASSIS)

  • Page 24: Schematic Diagram - Main Board (1/3)

    CDX-838 7-9. SCHEMATIC DIAGRAM – MAIN Board (1/3) – • See page 27 for Waveforms. • See page 30 for IC Block Diagrams. (Page (Page ELEVATOR HEIGHT (ADDRESS) ADJUSTMENT (Page 26)

  • Page 25: Schematic Diagram - Main Board (2/3)

    CDX-838 7-10. SCHEMATIC DIAGRAM – MAIN Board (2/3) – • See page 27 for Waveforms. • See page 31 for IC Block Diagrams. (Page 29) (Page 24) (Page 26)

  • Page 26: Schematic Diagram - Main Board (3/3)

    CDX-838 7-11. SCHEMATIC DIAGRAM – MAIN Board (3/3) – • See page 27 for Waveforms. • See page 31 for IC Block Diagrams. (Page 24) (Page 25)
  • Page 27 • Waveforms – RF Board – – MAIN Board (1/3) – – MAIN Board (2/3) – – MAIN Board (3/3) – 1 IC11 ed (RF O) (CD PLAY) 500 mV/DIV, 500 ns/DIV 6 IC101 ys (RFCK) qa IC603 4 w; IC401 7 (RFCK) 1 IC101 wj (MDP) (CD PLAY) qg IC401 ql (LRCK) 2.5 Vp-p...

  • Page 28: Printed Wiring Boards - Digital Out/Jack Boards

    7-12. PRINTED WIRING BOARDS – DIGITAL OUT/JACK Boards – • See page 19 for Circuit Boards Location. JACK BOARD (COMPONENT SIDE) JACK BOARD (CONDUCTOR SIDE) C902 CONTROL C901 (FOR SONY BUS) CN902 CN903 IC901 FB903 JACK FLEXIBLE BOARD CN901 1-664-796- FB901...

  • Page 29: Schematic Diagram - Digital Out/Jack Boards

    CDX-838 7-13. SCHEMATIC DIAGRAM – DIGITAL OUT/JACK Boards – (Page 25)
  • Page 30 IC51 BA6297AFP • IC Block Diagrams – RF Board – IC11 CXA1992BR 24 23 17 16 – 33 32 31 30 – – PD 2 PD 1 I-V AMP I-V AMP RF SUMMING T.S.D MUTE FOCUS OK COMPARATOR – – LASER –...
  • Page 31 IC202 BR24C16FJ-E2 IC301 BA6287F OUT1 START STOP LOGIC SERIAL CONTROL H.V. PUMP/TIMING LOGIC OUT2 8 VCC LOAD COMP DEVICE DATA RECOVERY ADDRESS DRIVER DRIVER COMPARATOR LOAD INC DATA WORD PROM ADDR/COUNTER VREF CONTROL LOGIC Y DEC SERIAL MUX POWER SAVE /ACK LOGIC IC302 BA8272F-E2...
  • Page 32 IC402 MSM514400D-60TS-K WRITE DATA INPUT DATA OUTPUT CLOCK BUFFER BUFFER GENERATOR CLOCK GENERATOR 4M BIT COLUMN SENSE AMP MEMORY DECODER I/O GATE CELL BOARD CLOCK BIAS GENERATOR GENERATOR DECODER REFRESH PRE- MODE ADDRESS ADDRESS CONTROL DECODER BUFFER COUNTER IC601 AK4321-VF-E2 IC502 KM62256DLG-7LT 28 VCC 19 18 17 16 15...

  • Page 33: Ic Pin Function Description

    ESPXLT ESP latch pulse signal output to the CXD2522Q (IC401) “L” active System reset signal input from the SONY bus interface (IC302) and reset signal generator (IC304) “L”: reset For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”...
  • Page 34 Not used (open) C.OUT Track number count signal input from the CXA1992BR (IC11) BUS.ON Bus on/off control signal input from the SONY bus interface (IC302) “H”: bus on A/D.SW Analog/digital select switch (SW801) input terminal “L”: digital, “H”: analog MGLK Magazine eject operation completion detect switch (SW201) input “L”: magazine detected...
  • Page 35 DATA0 to DATA7 Two-way data bus with the S-RAM (IC502) System reset signal input from the system controller (IC201), SONY bus interface (IC302) and reset signal generator (IC304) “L”: reset For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”...

  • Page 36: Exploded Views

    SECTION 8 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 37 (2) MECHANISM DECK SECTION-1 (MG-250D-137) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3375-497-1 CHASSIS (U) SUB ASSY 3-011-997-01 SPRING (STOPPER. LOWER) 3-024-161-01 SPRING (SUT)
  • Page 38 (3) MECHANISM DECK SECTION-2 (MG-250D-137) M104 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-024-170-01 SPRING (SB), TENSION X-3378-136-1 CHASSIS (D. D) SUB ASSY * 102 3-024-172-01 BRACKET (EVM) M104 A-3301-123-A ELJ MOTOR ASSY (ELEVATOR)
  • Page 39 (4) MECHANISM DECK SECTION-3 (MG-250D-137) M103 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 151 3-024-150-01 RETAINER (CHM) 3-010-252-01 ROLLER (CRE) * 152 X-3378-080-1 BRACKET (CHM. D) ASSY 3-010-268-01 SPRING (DH), TENSION 3-010-270-01 COVER (CHM) * 161 A-3290-194-I MAIN ASSY, CHASSIS (EVY) 3-321-813-01 WASHER, COTTER POLYETHYLENE...
  • Page 40 (5) MECHANISM DECK SECTION-4 (MG-250D-137) not supplied M101 not supplied M102 The components identified by Les composants identifiés par une mark 0 or dotted line with marque 0 sont critiques pour la mark 0 are critical for safety. sécurité. Replace only with part num- Ne les remplacer que par une pièce ber specified.

  • Page 41: Electrical Parts List

    DIGITAL OUT SECTION 9 ELECTRICAL PARTS LIST JACK MAIN NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark are seldom required for routine service. parts list may be different from the parts speci- 0 are critical for safety.
  • Page 42 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C316 1-135-605-21 ELECT 1000uF < FERRITE BEAD > C317 1-115-651-11 ELECT 100uF FB402 1-500-445-21 FERRITE C318 1-135-612-61 ELECT 100uF FB403 1-500-445-21 FERRITE C319 1-135-613-61 ELECT 47uF FB404 1-500-445-21 FERRITE C320 1-163-038-00 CERAMIC CHIP...
  • Page 43 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R111 1-216-049-11 RES-CHIP 1/10W < SWITCH > R114 1-216-049-11 RES-CHIP 1/10W R201 1-216-089-00 RES-CHIP 1/10W SW201 1-771-540-11 SWITCH, PUSH (1 KEY) (MAGAZINE DETECT) R202 1-216-089-00 RES-CHIP 1/10W SW202 1-771-540-11 SWITCH, PUSH (1 KEY) R203 1-216-089-00 RES-CHIP...
  • Page 44 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < CONNECTOR > 1-216-073-00 METAL CHIP 1/10W 1-216-085-00 METAL CHIP 1/10W CNJ11 1-778-776-21 CONNECTOR, FPC 17P CNJ12 1-778-777-21 CONNECTOR, FPC 26P 1-216-073-00 METAL CHIP 1/10W * CNP53 1-580-055-21 PIN, CONNECTOR (SMD) 2P 1-216-073-00 METAL CHIP 1/10W 1-216-073-00 METAL CHIP...
  • Page 45 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark ACCESSORIES & PACKING MATERIALS ******************************* 3-867-909-11 MANUAL, INSTRUCTION (ENGLISH, FRENCH, SPANISH, CHINESE) A-3291-950-C MAGAZINE (250T) ASSY ************************************************************ PARTS FOR INSTALLATION AND CONNECTIONS ************************************** 3-040-583-21 BRACKET * 502 X-3369-824-1 SCREW ASSY 1-590-519-21 CORD (WITH CONNECTOR) (BUS CABLE 5.5m) 1-790-455-21 CORD, CONNECTION (RCA PIN CORD 5.5m)
  • Page 46 CDX-838 Sony Corporation 9-870-026-11 99L057035-1 Mobile Electronics Division Company Printed in Singapore C 1999. 12 Published by General Engineering Dept.

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