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Sony CDX-646 Service Manual
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Sony CDX-646 Service Manual

Compact disc changer
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SERVICE MANUAL
CDX-646/646X
Photo: CDX-646
SPECIFICATIONS
System
Compact disc digital audio system
Laser diode properties Material: GaAlAs
Wavelength: 780 nm
Emission Duration: Continuous
Laser out-put Power: Less than
44.6 µW*
* This output is the value measured at a distance of 200 mm
from the objective lens surface on the Optical Pick-up Block.
Frequency response
10 – 20,000 Hz
Wow and flutter
Below the measurable limit
Signal-to-noise ratio
94 dB
Outputs
BUS control output (8 pins)
Analog audio output (RCA pin)
Current drain
800 mA (during CD playback)
800 mA (during loading or ejecting
a disc)
Operating temperature –10°C to +55°C (14°F to 131°F)
Approx. 262 × 90 × 185 mm
Dimensions
/8 × 3
/8 × 7
3
5
(10
(w/h/d) not incl. projecting parts
and controls
Mass
Approx. 2.1 kg (4 lb. 10 oz.)
Power requirement
12 V DC car battery
(negative ground)
Supplied accessories
Disc magazine (1)
Parts for installation and
connections (1 set)
Design and specifications are subject to change without
notice.
Canadian Model
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
3
/8 in.)
COMPACT DISC CHANGER
US Model
AEP Model
UK Model
CDX-646
E Model
CDX-646/646X
CDX-601/636
MG-251A-137
KSS-720A/Q-N

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  • Page 1 CDX-646/646X SERVICE MANUAL US Model Canadian Model AEP Model UK Model CDX-646 E Model CDX-646/646X Photo: CDX-646 Model Name Using Similar Mechanism CDX-601/636 CD Drive Mechanism Type MG-251A-137 Optical Pick-up Name KSS-720A/Q-N SPECIFICATIONS System Compact disc digital audio system Laser diode properties Material: GaAlAs...

  • Page 2: Servicing Notes

    DE FONCTIONNEMENT. NE REMPLACER CES COM- which have the “CAUTION LABEL” attached, please be sure to POSANTS QUE PAR DES PIÈCES SONY DONT LES put a new CAUTION LABEL (3-223-913-11) to the chassis (U.S) NUMÉROS SONT DONNÉS DANS CE MANUEL OU sub assy.

  • Page 3: Table Of Contents

    SECTION 1 This section is extracted from instruction manual. GENERAL Installation Installation Installation Installeren Installazione TABLE OF CONTENTS SERVICING NOTES ............2 Precautions Précautions Sicherheitsmaßnahmen Voorzorgsmaatregelen Precauzioni • Choose the mounting location carefully, observing the • Choisissez l’emplacement de montage en tenant compte •...
  • Page 4 Use the supplied disc magazine or the disc magazine XA-250. Avec la partie fléchée tournée vers le haut • To listen to an 8 cm CD, use the separately sold Sony CD adapter • Voor het afspelen van een 8 cm CD-single heeft u de Sony Poussez pour déverrouiller la porte...
  • Page 5 SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. CASE (UPPER. T), FRONT PANEL ASSY 3 screw (PTT2.6 × 6) 3 screw (PTT2.6 × 6) 4 lever (FLT. 838) 5 case (upper. T) 1 screw (PTT2.6 × 6) 3 screw (PTT2.6 ×...
  • Page 6 JACK BOARD Remove the jack board of the arrow. 1 ground point screw (PTT2.6 × 6) 2 jack board MAIN BOARD, SLIDE VARIABLE RESISTOR (ELEVATOR HEIGHT SENSOR) (RV202) 1 main flexible board (CNJ101) 5 two screws (FP) 5 screw (FP) 6 main board 2 Remove two solders of the elevator motor leads (M104).
  • Page 7 ELJ MOTOR ASSY (ELEVATOR) (M104) 1 screw (PTT2 × 4) 2 bracket (EVM.S) 3 ELJ motor assy (elevator) (M104) ESCUTCHEON (T) 3 two claws 2 Remove the claw in the direction of arrow A . 4 Remove the ditch in the direction of arrow B . 5 Remove the escutcheon (T) in the direction of arrow C .
  • Page 8 CHASSIS (U.S) SUB ASSY 2 Remove the edge in the direction 1 three screws of arrow A . (PTT2 × 4) 1 two screws (PTT2 × 4) 5 chassis (U.S) sub assy 1 screw (PTT2 × 4) 4 spring (SUT) CHASSIS ASSY 6 chassis assy 5 spring (stopper.lower)
  • Page 9 RF BOARD 3 two screws (PS2 × 4) 4 RF board 3 two screws (PS2 × 4) 2 Remove four solders of the LSW board leads and spindle motor leads (M102). 2 Remove two solders of the sled motor leads 1 OP flexible board (CN102).
  • Page 10 LSW BOARD, SPINDLE MOTOR (S) SUB ASSY (M102) 8 two precision screws (P1.7 × 2.2) 3 spring (chucking) 6 retainer (disc) 1 precision screw 4 precision screw (P2 × 2.5) (P2 × 2.2) 5 bracket (CP) 2 LSW board 9 Remove the spindle motor (S) sub assy (M102) in the direction of the arrow.
  • Page 11 SECTION 3 MECHANISM DECK ASSEMBLY Note: Follow the assembly procedure in the numerical order given. OPTICAL PICK-UP COMPLETE ASSY 1 Move the lever (LOCK 3A) in the direction of arrow A , and return it a little in the direction of arrow B from the position where the chuck plate is moved chuck plate down to the lower limit.
  • Page 12 OPERATION CHECK 1 Confirm that the slider moves in the direction of arrow C to move down the chuck plate if the gear (LOAD CAM) is rotated in the direction of arrow A or the chuck plate moves up and the slider moves in the direction of arrow D if the gear is rotated in the direction of arrow B .

  • Page 13: Connections

    SECTION 4 MECHANICAL ADJUSTMENT • Elevator Height (Address) Adjustment Adjustment Method: Note: This adjustments is necessary when the system controller (IC201), variable resistor (RV201), slider (R), slider (L), or chassis (ELV) 1. Connect this set to the master unit (e.g. MDX-C7970/C7970R), was replaced for any repair.

  • Page 14: Electrical Check

    SECTION 5 ELECTRICAL CHECK Note: Focus Bias Check 1. This check is performed with the set placed horizontally. 2. Power supply voltage: DC14.4 V (more than 3 A). Connection: 3. Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only –...
  • Page 15 Tracking Offset Check Connection: – RF Board (Component Side) – oscilloscope (DC range) – TP (VC) IC101 TP (TE) Procedure: 1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF board. 2. Put the set into play mode by loading the disc (YEDS-18). 3.
  • Page 16 MEMO...

  • Page 17: Diagrams

    CDX-646/646X SECTION 6 DIAGRAMS 6-1. BLOCK DIAGRAM – MAIN Section – FILTER CN901 (1/2) 63 66 65 RF AMP, ANALOG OUT FOCUS/TRACKING ERROR AMP EMPHI IC101 AOUT2 AIN2 LOUT1 DETECTOR SERIAL PCMD PCMDI DIGITAL FILTER, GND-ISOLATION & BUFFER LRCK NOISE SHAPER...

  • Page 18: Block Diagram – Bus Control Power Supply Section

    B. UP +5V CDON 8 RESET SIGNAL CN901 (2/2) RESET GENERATOR CONTROL IC303 PS901 B. UP +5V REGULATOR B. UP IC303 BUS INTERFACE (FOR SONY BUS) IC302 DATA DATA SCLK BUSON OUT BUSON BUSON BUSON OUT BUSON IN RESET RESET SWITCH...

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

    6-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS • Circuit Boards Location Note on Printed Wiring Boards: 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 - Lsw/Rf Boards

    CDX-646/646X 6-4. PRINTED WIRING BOARDS – LSW/RF Boards – • See page 19 for Circuit Boards Location. • Semiconductor Location – RF Board– (Component Side) Ref. No. Location IC101 IC201 Q101 (Page 22)

  • Page 21: Schematic Diagram - Lsw/Rf Boards

    CDX-646/646X 6-5. SCHEMATIC DIAGRAM – LSW/RF Boards – • • See page 27 for for Waveforms. See page 28 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 Board Main Board (Component Side)

    CDX-646/646X 6-6. PRINTED WIRING BOARD – MAIN Board (Component Side) – • See page 19 for Circuit Boards Location. • Semiconductor Location Ref. No. Location D302 D303 D306 D307 D309 D310 D313 D314 D315 IC101 IC201 IC301 IC302 IC303 IC401...

  • Page 23: Printed Wiring Board Main Board (Conductor Side)

    CDX-646/646X 6-7. PRINTED WIRING BOARD – MAIN Board (Conductor Side) – • See page 19 for Circuit Boards Location. • Semiconductor Location Ref. No. Location IC304 IC305 (Page 26)

  • Page 24: Schematic Diagram – Main Board (1/2)

    CDX-646/646X 6-8. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • See page 27 for Waveforms. • See page 28 for IC Block Diagram. (Page 21)

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

    CDX-646/646X 6-9. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • See page 27 for Waveform. • See page 28 for IC Block Diagrams. (Page 26) (Page 26)

  • Page 26: Printed Wiring Boards – Jack/Switch Boards

    CDX-646/646X 6-10. PRINTED WIRING BOARDS – JACK/SWITCH Boards – • 6-11. SCHEMATIC DIAGRAM – JACK/SWITCH Boards – See page 19 for Circuit Boards Location. (Page 22) (Page 25) (Page 25) (Page 23)

  • Page 27: Main Board (Component Side)

    • Waveforms – RF Board – – MAIN Board – 1 IC101 qh (RFO) (CD play mode) 1 IC101 uj (LRCK), uk (LRCKI) (CD play mode) 1.4 ± 0.3 Vp-p 5.6 Vp-p 22.8 µs 2 IC101 qf (FE) (CD play mode) 2 IC101 ia (BCK), is (BCKI) (CD play mode) 5.7 Vp-p...

  • Page 28: Ic Block Diagrams

    • IC Block Diagrams – RF Board – IC101 CXA2596M-T6 24 VCC LC/PD HOLD LD ON AGCVTH APC LD HOLD SW APC PD AGCCONT COMPARATOR RF BOT RFTC COMPARATOR RF I RF SUMMING RF EQ FOCUS ERROR F I-V AMP TRACKING ERROR E I-V AMP...
  • Page 29 – MAIN Board – IC101 CXD2598Q 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 61 60 59 54 53 52 51 CLOCK GENERATOR BCKI ENPH EMPHI OP AMP ANALOG XVDD CONVERTER SWITCH SERIAL-IN DIGITAL...

  • Page 30: 6-12. Ic Pin Function Description

    RAMA8 RAMCS Chip select signal output to the S-RAM “L”: active Not used (open) System reset signal input from the SONY bus interface (IC302) and reset signal generator (IC303) RESET “L”: reset For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”...
  • Page 31 (A/D input) — Not used (open) BUSON Bus on/off control signal input from the SONY bus interface (IC302) “H” bus on EJECT Eject switch (SW801) input terminal “H” active MAGSW Magazine in/out detect switch input terminal Not used (open)
  • Page 32 *1 chucking motor (M103) control Mode LOAD STOP SAVE BRAKE Terminal CHUCKING CH.F (pin ua) “H” “H” “L” “L” CH.R (pin us) “H” “L” “H” “L” *2 elevator motor (M104) control Mode ELEVATOR ELEVATOR STOP BRAKE Terminal DOWN ELVF (pin uf) “H”...

  • Page 33: Exploded Views

    SECTION 7 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 34 (2) MECHANISM DECK SECTION-1 (MG-251A-137) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3378-091-1 CHASSIS (U. S) SUB ASSY 3-011-997-01 SPRING (STOPPER. LOWER) 3-024-161-11 SPRING (SUT)
  • Page 35 (3) MECHANISM DECK SECTION-2 (MG-251A-137) M104 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-024-170-01 SPRING (SB), TENSION X-3378-092-1 CHASSIS (D. S) SUB ASSY * 152 3-040-790-01 BRACKET (EVM. S) M104 A-3301-123-A ELJ MOTOR ASSY (ELEVATOR)
  • Page 36 (4) MECHANISM DECK SECTION-3 (MG-251A-137) M103 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 201 3-024-150-01 RETAINER (CHM) 3-010-252-11 ROLLER (CRE) * 202 X-3378-080-1 BRACKET (CHM. D) ASSY 3-010-268-01 SPRING (DH), TENSION 3-321-813-01 WASHER, COTTER POLYETHYLENE * 211 A-3290-194-C MAIN ASSY, CHASSIS (EVY) 3-017-139-01 GEAR (WORM LOAD A)
  • Page 37 (5) MECHANISM DECK SECTION-4 (MG-251A-137) not supplied M102 not supplied M101 not supplied 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.

  • Page 38: Electrical Parts List

    SECTION 8 JACK MAIN ELECTRICAL PARTS LIST 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 39 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C403 1-126-382-11 ELECT 100uF R143 1-218-871-11 RES-CHIP 1/16W R144 1-218-871-11 RES-CHIP 1/16W C404 1-126-157-11 ELECT 10uF R145 1-218-871-11 RES-CHIP 1/16W C405 1-126-157-11 ELECT 10uF C406 1-162-927-11 CERAMIC CHIP 100PF R201 1-216-821-11 METAL CHIP...
  • Page 40 SWITCH Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C202 1-107-826-11 CERAMIC CHIP 0.1uF < SWITCH > C203 1-162-962-11 CERAMIC CHIP 470PF C204 1-162-962-11 CERAMIC CHIP 470PF 1-529-566-21 SWITCH, PUSH (1 KEY) (CHUCKING END DETECT) C205 1-162-962-11 CERAMIC CHIP 470PF 1-529-566-21 SWITCH, PUSH (1 KEY) (SAVE END DETECT)
  • Page 41 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark PARTS FOR INSTALLATION AND CONNECTIONS ************************************** 3-040-583-21 BRACKET (T) * 502 X-3369-824-1 SCREW ASSY 1-590-874-11 CORD, CONNECTION (RCA PIN CORD 5.5m) 1-590-519-21 CORD (WITH CONNECTOR) (BUS CABLE 5.5m) +PSW4 ×...
  • Page 42 CDX-646/646X Sony Corporation 9-870-218-11 2000L0562-1 Audio Entertainment Group Printed in Japan C 2000. 12 Published by General Engineering Dept.

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