Sony CDX-4270R Service Manual
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Sony CDX-4270R Service Manual

Fm/mw/lw compact disc player
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SERVICE MANUAL
CD player section
System
Compact disc digital audio
system
Signal-to-noise ratio
90 dB
Frequency response
10 – 20,000 Hz
Wow and flutter
Below measurable limit
Tuner section
FM
Tuning range
87.5 – 108.0 MHz
Aerial terminal
External aerial connector
Intermediate frequency 10.7 MHz
Usable sensitivity
12 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.8% (stereo),
0.6% (mono)
Separation
35 dB at 1 kHz
Frequency response
30 – 15,000 Hz
MW/LW
Tuning range
MW: 531 – 1,602 kHz
LW: 153 – 281 kHz
Aerial terminal
External aerial connector
Intermediate frequency 10.7 MHz / 450 kHz
Sensitivity
MW: 30 µV
LW: 50 µV
MICROFILM
CDX-4270R
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Power amplifier section
Outputs
Speaker impedance
Maximum power output 40 W × 4 (at 4 ohms)
General
Outputs
Tone controls
Power requirements
Dimensions
Mounting dimension
Mass
Supplied accessories
Design and specifications are subject to change without
notice.
FM/MW/LW COMPACT DISC PLAYER
AEP Model
UK Model
CDX-4180R
MG-363X-121
KSS-521A
Speaker outputs
(sure seal connectors)
4 – 8 ohms
Line output (1)
Power aerial relay control
lead
Power amplifier control
lead
Telephone ATT control
lead
Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
12 V DC car battery
(negative ground)
Approx. 178 × 50 × 185 mm
(w/h/d)
Approx. 182 × 53 × 162 mm
(w/h/d)
Approx. 1.2 kg
Parts for installation and
connections (1 set)
Front panel case (1)
1
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Summary of Contents for Sony CDX-4270R

  • Page 1 CDX-4270R SERVICE MANUAL AEP Model UK Model Model Name Using Similar Mechanism CDX-4180R CD Drive Mechanism Type MG-363X-121 Optical Pick-up Name KSS-521A SPECIFICATIONS CD player section Power amplifier section System Compact disc digital audio Outputs Speaker outputs system (sure seal connectors)
  • Page 2 COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1. GENERAL Location of controls ..............4 Getting Started ................. 4 Setting the clock ..............4 CD Player ................4 Radio ..................5 RDS ..................5 Other Functions ............... 6 Connections ................8 2. DISASSEMBLY 2-1. Cover ................. 10 2-2.

  • Page 4: General

    SECTION 1 GENERAL This section is extracted from instruction manual.

  • Page 10: Cover

    SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. COVER 1 claw 4 cover 3 claws 2 claw 2-2. FRONT PANEL ASSY 2 front panel assy 1 Push the button (release).

  • Page 11: Sub Panel (1) Assy

    2-3. SUB PANEL (1) ASSY 5 claw 6 sub panel (1) assy 1 PTT 2.6x6 4 claw 2 PTT 2.6x6 3 PTT 2.6x6 2-4. CD MECHANISM BLOCK 2 PTT 2.6x6 7 PTT 2.6x6 8 bracket (M/D) 3 PTT 2.6x6 5 CD mechanism block 6 PTT 2.6x6 4 CNP700 1 PTT 2.6x6...

  • Page 12: Main Board

    2-5. MAIN BOARD 6 MAIN board 4 ground point screws (PTT 2.6x6) 5 ground point screw (PTT 2.6x6) 3 PTT 2.6x8 2 PTT 2.6x8 1 PTT 2.6x8 2-6. HEAT SINK 4 heat sink 3 PTT 2.6x8 2 PTT 2.6x12 1 PTT 2.6x8...

  • Page 13: Chassis (T) Sub Assy

    2-7. CHASSIS (T) SUB ASSY 4 P 2x3 3 P 2x3 5 chassis (T) sub assy 1 Unsolder the lead wires. 2 P 2x3 gray white black 2-8. LEVER ASSY 5 guide (disc) 6 lever (R) assy 3 tension spring (LR) 7 lever (L) assy 1 PS 2x4 2 DISC IN SW board...

  • Page 14: Servo Board

    2-9. SERVO BOARD 6 PS 2x4 5 PS 2x4 2 CN2 1 CN3 3 P 2x3 7 SERVO board 4 loading motor assy 2-10. ROLLER ASSY • When installing, take note of the positions arm (roller) and washers. (Fig. 1) washer washers washer...

  • Page 15: Chassis (Op) (O/S) Assy

    2-11. CHASSIS (OP) (O/S) ASSY 7 chassis (OP) (O/S) assy 8 compression spring (FL) 1 tension spring (KF1) 9 compression spring (FL) 2 tension spring (KR1) 5 Fit lever (D) in the direction of the arrow. 6 Turn loading ring in the direction of the arrow.

  • Page 16: Electrical Adjustments

    SECTION 3 ELECTRICAL ADJUSTMENTS TUNER SECTION 0 dB = 1 µV FM Auto Scan/Stop Level Adjustment Setting : D-BASS switch : OFF Cautions during repair SOURCE button : FM When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.
  • Page 17 FM Stereo Separation Adjustment FM RDS S-Meter Adjustment Setting : Setting : D-BASS switch : OFF D-BASS switch : OFF SOURCE button : FM SOURCE button : FM FM RF signal FM RF signal generator generator level meter antenna antenna terminal 10 k Ω...
  • Page 18 MW Auto Scan/Stop Level Adjustment Adjustment Location : tuner unit (TU601) Setting : D-BASS switch : OFF SOURCE n MODE button : MW 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω ) TU601 antenna Carrier frequency : 999 kHz terminal...

  • Page 19: Cd Section

    CD SECTION Focus Gain Adjustment (Coarse adjustment) This adjustment is not required unless the following parts are replaced: • Optical pick-up Note: • 1. CD Block basically constructed to operate without adjustment. Therefore, check each item in order given. Procedure: 2.

  • Page 20: Diagrams

    — Not used. (Connect to ground in this set.) SQ CKO Sub Q read clock output UNI SI SONY BUS system serial interface input UNI SO SONY BUS system serial interface output UNI CK SONY BUS system serial clock input/output C IN Track jump No.
  • Page 21 Pin No. Pin Name Pin Description Pin No. Pin Name Pin Description AMP ON Power amplifier power control output ANT REM ANT REMOTE power control output TXT ON Reset output to CD-TEXT decoder IC. (Not used in this set.) — Not used.

  • Page 22: Block Diagram -Cd Section

    CDX-4270R 4-2. BLOCK DIAGRAM — CD SECTION — OPTICAL PICK-UP RF AMP, SERVO CONTROL DIGITAL SIGNAL PROCESSOR D/A CONVERTER KSS-521A IC702 TUNER RF 0 PCMD VOUTL CD L-CH SECTION (Page 23) BCKIN R-CH CLKO VOUTR XLTO LRCK LRCIN DATA DATO...

  • Page 23: Block Diagram -Tuner Section

    CDX-4270R 4-3. BLOCK DIAGRAM — TUNER SECTION — ELECTRONIC (Page 22) VOLUME IC401 SECTION OUT FL TUNER UNIT CD L-CH MUTE TU601 Q110 CNJ600 PJ400 ANT AM (ANTENNA) –1 R 16 R-CH OUT RL 20 ANT FM LINE OUT REAR –2...

  • Page 24: Block Diagram -Display Section

    CDX-4270R 4-4. BLOCK DIAGRAM — DISPLAY SECTION — SYSTEM CONTROL LCD DRIVE IC801 (3/3) IC501 RESET RESET DATA BU5V IC902 LCD501 S900 RESET D910 BACK-UP BATT CHECK Q906 DIM ON 1 D807 BACK-UP DIMMER BATT 76 BU IN CHECK CONTROL...

  • Page 25: Circuit Boards Location

    4-5. CIRCUIT BOARDS LOCATION • Waveforms (MODE:PLAY) THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) for schematic diagram: • All capacitors are in µF unless otherwise noted. pF: µµF Approx.

  • Page 26: Printed Wiring Boards -Cd Mechanism Section

    CDX-4270R 4-6. PRINTED WIRING BOARDS — CD MECHANISM SECTION — • Semiconductor Location Ref. No. Location (Page 29)

  • Page 27: Schematic Diagram -Cd Mechanism Section

    CDX-4270R 4-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 25 for Waveforms. • Refer to page 35 for IC Block Diagrams. (Page Note: • Voltage and waveforms are dc with respect to ground under no-signal conditions.

  • Page 28: Printed Wiring Board -Main Section

    CDX-4270R 4-8. PRINTED WIRING BOARD — MAIN SECTION — • Semiconductor Location (side A) Ref. No. Location D403 D603 D881 D909 D-10 D914 D918 D919 D920 D930 D940 D-10 IC401 IC601 IC602 IC603 IC801 Q110 Q111 Q210 Q211 Q615 Q618...
  • Page 29 CDX-4270R • Semiconductor Location (side B) Ref. No. Location Ref. No. Location D402 D915 G-12 D404 D916 I-13 D405 D924 E-13 D406 D407 IC200 D408 IC702 F-11 IC901 F-13 D409 D410 IC902 D411 D601 JW29 D604 D702 F-12 Q101 D807...

  • Page 30: Schematic Diagram -Main Section (1/3)

    CDX-4270R 4-9. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — • Refer to page 37 for IC Block Diagrams. TDA7384 Note: (Page 31) (Page 32) • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...

  • Page 31: Schematic Diagram -Main Section (2/3)

    CDX-4270R 4-10. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) — • Refer to page 38 for IC Block Diagrams. (Page 30) 0.056 Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...

  • Page 32: Schematic Diagram -Main Section (3/3)

    CDX-4270R 4-11. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — • Refer to page 38 for IC Block Diagrams. (Page 30) (Page 33) Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...

  • Page 33: Schematic Diagram -Display Section

    CDX-4270R 4-12. SCHEMATIC DIAGRAM — DISPLAY SECTION — (Page 32) Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM...

  • Page 34: Printed Wiring Board -Display Section

    CDX-4270R 4-13. PRINTED WIRING BOARD — DISPLAY SECTION — (Page 29) • Semiconductor Location Ref. No. Location Ref. No. Location (D501) B-10 LED501 (D502) B-12 LED502 (D503) B-10 LED503 (D506) B-11 LED504 (D507) C-10 LED505 (D508) C-10 (Q502) B-13 (Q505)

  • Page 35: Ic Block Diagrams

    • IC Block Diagrams IC1 CXD2507AQ SERVO AUTO DATA SEQUENCER XRST SENS SUB CODE MUTE PROCESSOR INTERFACE SQCK DIGITAL LOCK SQSO TEST EXCK SBSO FILO SCOR DIGITAL FILI DEMODULATOR WFCK EMPH AVSS CLTV ASYMMETRY AVDD CORRECTOR DIGITAL DOUT INTERFACE BIAS ASYI ERROR FSTT...
  • Page 36 IC2 CXA1782BQ 27 26 25 LEVEL S MIRR SENS RF IV AMP1 DFCT C.OUT XRST RF IV AMP2 FE BIAS IIL DATA REGISTER INPUT SHIFT REGISTER DATA ADDRESS DECODER OUTPUT DECODER TOG1-3 FS1-4 TG1-2 TM1-7 PS1-4 F IV AMP BAL1-3 FZC COMP E IV AMP TE AMP...
  • Page 37 IC401 TDA7462D013TR SE3L SE3R MUTE PAUSE PAUSE DETECT FRONT INPUT TREBLE/ OUT FL VOICE BANDPASS LOUDNESS VOLUME FADER SOFT GAIN & BASS CONTROL SE1L CONTROL AUTO MUTE CONTROL CIRCUIT CIRCUIT SE1R ZERO CIRCUIT FRONT OUT FR MD– FADER CDL+ CDL– COMPANDER CDR–...
  • Page 38 IC601 TDA7427AD1TR LPOUT VDD1 VDD2 LP FM SWITCH CHARGE PHASE 11 BIT PROG LP1/LP2 GND AM PUMP COMP COUNTER LP HC LP AM SWITCH SWITCH SWM/DIR SWM/DIR V REF AM IN SWITCH AM/FM INLOCK 6 BIT PROG PRE COUNTER DETECTOR COUNTER :32/33 FM IN...

  • Page 39: Exploded Views

    SECTION 5 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • Color Indication of Appearance Parts The components identified by number in the exploded views are not supplied. mark ! or dotted line with mark. Example : • Items marked “*” are not stocked since KNOB, BALANCE (WHITE) ...

  • Page 40: Front Panel Section

    5-2. FRONT PANEL SECTION not supplied (DISPLAY board) LCD501 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-019-549-51 BUTTON (RELEASE) * 61 X-3376-730-1 HOLDER (LCD) ASSY 3-019-544-23 KNOB (SEEK/AMS) * 62 3-030-879-01 BRACKET (LCD) 3-039-482-01 SPRING (RELEASE) * 63 3-032-198-01 SHEET (E) 3-019-550-01 BUTTON (MODE/SOUND)

  • Page 41: Cd Mechanism Section (1)

    5-3. CD MECHANISM SECTION (1) (MG-363X-121) M903 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 101 1-659-836-11 DISC IN SW BOARD 3-931-902-04 ARM (ROLLER) * 102 A-3291-816-B CHASSIS (T) SUB ASSY 3-936-756-01 ROLLER (D) 3-931-909-01 SPRING (LR), TENSION 3-321-393-01 WASHER, STOPPER X-3371-501-1 LEVER (L) ASSY * 113...

  • Page 42: Cd Mechanism Section (2)

    5-4. CD MECHANISM SECTION (2) (MG-363X-121) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-931-893-01 ARM, CHUCKING A-3277-802-C CHASSIS (M) COMPLETE ASSY 3-931-897-01 DAMPER (T) 3-931-883-01 SPRING (TR), TENSION 3-931-879-02 LEVER (D) 3-931-881-01 LEVER (LOCK) * 154 3-913-404-11 RETAINER (DISC) 3-931-882-02 GEAR (MDL) 3-931-894-01 BRACKET (CP)

  • Page 43: Cd Mechanism Section (3)

    5-5. CD MECHANISM SECTION (3) (MG-363X-121) M901 M902 The components identified by mark ! or dotted line with mark. ! are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 201...

  • Page 44: Electrical Parts List

    SECTION 6 DISC IN SW DISPLAY ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by mark ! or dotted line with mark. the parts list may be different from the they are seldom required for routine service.
  • Page 45 DISPLAY LIMIT SW Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark LSW524 1-762-141-12 SWITCH, KEY BOARD (WITH LED) (DSPL) R532 1-216-029-00 METAL CHIP 1/10W (AMBER) (AMBER) LSW524 1-762-142-12 SWITCH, KEY BOARD (WITH LED) (DSPL) R534 1-216-025-00 RES,CHIP 1/10W (GREEN) (GREEN)
  • Page 46 LOAD SW MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-659-837-11 LOAD SW BOARD C605 1-124-234-00 ELECT 22uF C606 1-124-584-00 ELECT 100uF *************** C607 1-163-021-11 CERAMIC CHIP 0.01uF < SWITCH > C608 1-126-295-11 ELECT 10uF C609 1-163-021-11 CERAMIC CHIP 0.01uF...
  • Page 47 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C704 1-164-004-11 CERAMIC CHIP 0.1uF D406 8-719-923-92 DIODE MTZJ-T-77-16B C705 1-163-009-11 CERAMIC CHIP 0.001uF D407 8-719-923-92 DIODE MTZJ-T-77-16B C707 1-162-970-11 CERAMIC CHIP 0.01uF D408 8-719-923-92 DIODE MTZJ-T-77-16B C708 1-163-235-11 CERAMIC CHIP 22PF...
  • Page 48 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JUMPER RESISTOR > Q614 8-729-120-28 TRANSISTOR 2SC2412K-T-146-R Q615 8-729-901-00 TRANSISTOR DTC124EKA-T146 JR405 1-216-295-00 SHORT Q618 8-729-120-28 TRANSISTOR 2SC2412K-T-146-R JR409 1-216-295-00 SHORT Q804 8-729-901-00 TRANSISTOR DTC124EKA-T146 JR603 1-216-295-00 SHORT Q901 8-729-027-31 TRANSISTOR DTA124EKA-T146...
  • Page 49 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R223 1-216-089-00 RES,CHIP 1/10W R651 1-216-025-00 RES,CHIP 1/10W R226 1-216-095-00 METAL CHIP 1/10W R694 1-216-017-00 RES,CHIP 1/10W R228 1-216-082-00 RES,CHIP 1/10W R695 1-216-097-00 RES,CHIP 100K 1/10W R229 1-216-082-00 RES,CHIP 1/10W R699...
  • Page 50 MAIN SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R865 1-216-097-00 RES,CHIP 100K 1/10W A-3309-227-A SERVO BOARD, COMPLETE R866 1-216-097-00 RES,CHIP 100K 1/10W *********************** R868 1-216-049-11 RES,CHIP 1/10W R869 1-216-097-00 RES,CHIP 100K 1/10W < CAPACITOR > R870 1-216-025-00 RES,CHIP 1/10W...
  • Page 51 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JUMPER RESISTOR > < TRANSISTOR > 1-216-296-00 SHORT 8-729-904-60 TRANSISTOR DTB113ZK-T-146 1-216-296-00 SHORT 8-729-904-86 TRANSISTOR 2SB1197K-T-146-Q 1-216-296-00 SHORT 1-216-296-00 SHORT < RESISTOR > 1-216-296-00 SHORT 1-216-073-00 METAL CHIP 1/10W 1-216-296-00 SHORT 1-216-097-00 RES,CHIP...
  • Page 52 CDX-4270R SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < VARIABLE RESISTOR > PARTS FOR INSTALLATION AND CONNECTIONS *************************************** 1-238-091-11 RES, ADJ, CERMET 22K 1-238-091-11 RES, ADJ, CERMET 22K 3-012-360-21 FRAME X-3374-928-1 COLLAR ASSY ************************************************************* X-3370-077-1 SCREW ASSY (AE.KEY), FITTING...

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