Sony CDX-646 Service Manual
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Also See for CDX-646:
- Service manual (42 pages) ,
- Operating instructions (3 pages) ,
- Limited warranty (1 page)
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3 7 63 1515 0
SERVICE MANUAL
TE
L 13942296513
www
.
http://www.xiaoyu163.com
CDX-646/646X
System
Laser diode properties Material: GaAlAs
* 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
Wow and flutter
Signal-to-noise ratio
Outputs
Current drain
Operating temperature –10°C to +55°C (14°F to 131°F)
Dimensions
Mass
Power requirement
Supplied accessories
Design and specifications are subject to change without
notice.
x
ao
u163
y
i
http://www.xiaoyu163.com
2 9
8
Photo: CDX-646
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Q Q
3
6 7
1 3
1 5
Compact disc digital audio system
Wavelength: 780 nm
Emission Duration: Continuous
Laser out-put Power: Less than
44.6 µW*
10 – 20,000 Hz
Below the measurable limit
94 dB
BUS control output (8 pins)
Analog audio output (RCA pin)
800 mA (during CD playback)
800 mA (during loading or ejecting
a disc)
Approx. 262 × 90 × 185 mm
/8 × 3
/8 × 7
3
5
3
(10
/8 in.)
(w/h/d) not incl. projecting parts
and controls
Approx. 2.1 kg (4 lb. 10 oz.)
12 V DC car battery
(negative ground)
Disc magazine (1)
Parts for installation and
connections (1 set)
COMPACT DISC CHANGER
co
.
9 4
2 8
US Model
Canadian Model
AEP Model
UK Model
E Model
CDX-646/646X
CDX-601/636
MG-251A-137
KSS-720A/Q-N
0 5
8
2 9
9 4
2 8
m
9 9
CDX-646
9 9
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Summary of Contents for Sony CDX-646
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Page 1: Te L 13942296513
3 7 63 1515 0 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 L 13942296513 System... -
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
http://www.xiaoyu163.com SECTION 1 This section is extracted from 3 7 6 3 1 5 1 5 0 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 •... -
Page 4: Connections
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: Disassembly
http://www.xiaoyu163.com SECTION 2 DISASSEMBLY 3 7 63 1515 0 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 ×... - Page 6 http://www.xiaoyu163.com 3 7 63 1515 0 JACK BOARD Remove the jack board of the arrow. 1 ground point screw (PTT2.6 × 6) 2 jack board L 13942296513 MAIN BOARD, SLIDE VARIABLE RESISTOR (ELEVATOR HEIGHT SENSOR) (RV202) 1 main flexible board (CNJ101) 5 two screws (FP) 5 screw (FP)
- Page 7 http://www.xiaoyu163.com 3 7 63 1515 0 ELJ MOTOR ASSY (ELEVATOR) (M104) 1 screw (PTT2 × 4) 2 bracket (EVM.S) 3 ELJ motor assy (elevator) (M104) L 13942296513 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 .
- Page 8 http://www.xiaoyu163.com 3 7 63 1515 0 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 ×...
- Page 9 http://www.xiaoyu163.com 3 7 63 1515 0 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 L 13942296513 of the sled motor leads 1 OP flexible board (CN102).
- Page 10 http://www.xiaoyu163.com 3 7 63 1515 0 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.
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Page 11: Mechanism Deck Assembly
http://www.xiaoyu163.com SECTION 3 MECHANISM DECK ASSEMBLY 3 7 63 1515 0 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 http://www.xiaoyu163.com 3 7 63 1515 0 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 .
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Page 13: Mechanical Adjustment
http://www.xiaoyu163.com SECTION 4 MECHANICAL ADJUSTMENT 3 7 63 1515 0 • 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
http://www.xiaoyu163.com SECTION 5 ELECTRICAL CHECK 3 7 63 1515 0 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 http://www.xiaoyu163.com 3 7 63 1515 0 Tracking Offset Check Connection: – RF Board (Component Side) – oscilloscope (DC range) – TP (VC) IC101 TP (TE) Procedure: L 13942296513 1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF board.
- Page 16 http://www.xiaoyu163.com 3 7 63 1515 0 MEMO L 13942296513 u163 http://www.xiaoyu163.com...
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Page 17: Diagrams
CDX-646/646X SECTION 6 3 7 6 3 1 5 1 5 0 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... -
Page 18: Power Supply Section
GENERATOR CONTROL IC303 PS901 L 1 3 9 4 2 2 9 6 5 1 3 B. UP +5V REGULATOR B. UP IC303 BUS INTERFACE (FOR SONY BUS) IC302 DATA DATA SCLK BUSON OUT BUSON BUSON BUSON OUT BUSON IN... -
Page 19: Note For Printed Wiring Boards And Schematic Diagrams
http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 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. •... -
Page 20: Printed Wiring Boards - Lsw/Rf Boards
CDX-646/646X 3 7 6 3 1 5 1 5 0 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... -
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. 3 7 6 3 1 5 1 5 0 L 1 3 9 4 2 2 9 6 5 1 3... -
Page 22: Main Board (Component Side)
CDX-646/646X 6-6. PRINTED WIRING BOARD – MAIN Board (Component Side) – • See page 19 for Circuit Boards Location. 3 7 6 3 1 5 1 5 0 • Semiconductor Location Ref. No. Location D302 D303 D306 D307 D309... -
Page 23: Main Board (Conductor Side)
CDX-646/646X 6-7. PRINTED WIRING BOARD – MAIN Board (Conductor Side) – • See page 19 for Circuit Boards Location. 3 7 6 3 1 5 1 5 0 • Semiconductor Location Ref. No. Location IC304 IC305 L 1 3 9 4 2 2 9 6 5 1 3... -
Page 24: Schematic Diagram - Main Board (1/2)
CDX-646/646X 3 7 6 3 1 5 1 5 0 6-8. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • See page 27 for Waveforms. • See page 28 for IC Block Diagram. (Page 21) L 1 3 9 4 2 2 9 6 5 1 3 u 1 6 3 http://www.xiaoyu163.com... -
Page 25: Schematic Diagram - Main Board (2/2)
CDX-646/646X 3 7 6 3 1 5 1 5 0 6-9. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • See page 27 for Waveform. • See page 28 for IC Block Diagrams. (Page 26) L 1 3 9 4 2 2 9 6 5 1 3... -
Page 26: T E
CDX-646/646X 3 7 6 3 1 5 1 5 0 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) L 1 3 9 4 2 2 9 6 5 1 3... - Page 27 http://www.xiaoyu163.com 3 7 63 1515 0 • 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)
- Page 28 http://www.xiaoyu163.com 3 7 63 1515 0 • 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...
- Page 29 http://www.xiaoyu163.com 3 7 63 1515 0 – 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...
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Page 30: Ic Pin Function Description
L 13942296513 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 http://www.xiaoyu163.com 3 7 63 1515 0 *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...
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Page 33: Exploded Views
http://www.xiaoyu163.com SECTION 7 EXPLODED VIEWS 3 7 63 1515 0 NOTE: • Items marked “*” are not stocked since they • -XX and -X mean standardized parts, so 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 http://www.xiaoyu163.com 3 7 63 1515 0 (2) MECHANISM DECK SECTION-1 (MG-251A-137) L 13942296513 u163 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) http://www.xiaoyu163.com...
- Page 35 http://www.xiaoyu163.com 3 7 63 1515 0 (3) MECHANISM DECK SECTION-2 (MG-251A-137) M104 L 13942296513 u163 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) http://www.xiaoyu163.com...
- Page 36 http://www.xiaoyu163.com 3 7 63 1515 0 (4) MECHANISM DECK SECTION-3 (MG-251A-137) L 13942296513 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...
- Page 37 http://www.xiaoyu163.com 3 7 63 1515 0 (5) MECHANISM DECK SECTION-4 (MG-251A-137) not supplied M102 L 13942296513 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.
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Page 38: Electrical Parts List
http://www.xiaoyu163.com SECTION 8 JACK MAIN 3 7 63 1515 0 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 parts list may be different from the parts speci- are seldom required for routine service. - Page 39 http://www.xiaoyu163.com MAIN 3 7 63 1515 0 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...
- Page 40 http://www.xiaoyu163.com SWITCH 3 7 63 1515 0 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...
- Page 41 http://www.xiaoyu163.com 3 7 63 1515 0 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 3 7 63 1515 0 L 13942296513 u163 Sony Corporation 9-870-218-11 2000L0562-1 Audio Entertainment Group Printed in Japan C 2000. 12 Published by General Engineering Dept. http://www.xiaoyu163.com...