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Sony CDX-C6850 Service Manual
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Sony CDX-C6850 Service Manual

Sony CDX-C6850 Service Manual

Fm/am compact disc player
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SERVICE MANUAL

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
17 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more
than 1% total harmonic distortion.
Other Specifications
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
Laser Diode Properties
Material
GaAlAs
Wavelength
780 nm
Emission Duration
Continuous
Less than 44.6 µW*
Laser output power
* This output is the value measured at a distance
of 200 mm from the objective lens surface on the
Optical Pick-up Block.
Tuner section
FM
Tuning range
87.5 – 107.9 MHz
Antenna terminal
External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity
10 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.7% (stereo),
0.5% (mono)
Separation
35 dB at 1 kHz
Frequency response
30 – 15,000 Hz
AM
Tuning range
530 – 1,710 kHz
Antenna terminal
External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
30 µV
Sensitivity
MICROFILM
CDX-C6850
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
Speaker impedance
4 – 8 ohms
Maximum power output 40 W × 4 (at 4 ohms)
General
Outputs
Line outputs (2)
Power antenna relay
control lead
Power amplifier control
lead
Telephone ATT control
lead
Bass ±8 dB at 100 Hz
Tone controls
Treble ±8 dB at 10 kHz
Power requirements
12 V DC car battery
(negative ground)
Approx. 178 × 50 × 185 mm
Dimensions
× 2 × 7
(7
1/8
(w/h/d)
Approx. 182 × 53 × 162 mm
Mounting dimensions
× 2
(7
1/4
(w/h/d)
Mass
Approx. 1.2 kg (2 lb. 10 oz.)
Supplied accessories
Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change without
notice.
FM/AM COMPACT DISC PLAYER
– 1 –
US Model
Canadian Model
CDX-C5750/C5850
MG-363T-121
KSS-521A
in.)
3/8
× 6
in.)
1/8
1/2

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  • Page 1: Specifications

    CDX-C6850 SERVICE MANUAL US Model Canadian Model SPECIFICATIONS Model Name Using Similar Mechanism CDX-C5750/C5850 CD Drive Mechanism Type MG-363T-121 AUDIO POWER SPECIFICATIONS (US Model) Optical Pick-up Name KSS-521A POWER OUTPUT AND TOTAL HARMONIC DISTORTION 17 watts per channel minimum continuous average power into 4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than 1% total harmonic distortion.

  • Page 2: Table Of Contents

    DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT 5-5. CD Mechanism Section (3) ..........56 CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY 6. ELECTRICAL PARTS LIST ........57 DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
  • Page 3 SECTION 1 GENERAL This section is extracted from instruction manual. – 3 –...
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  • Page 10: Disassembly

    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 3 Push the bearing (L). 2 Push the bearing (R). 4 front panel assy 1 Push the button (open).

  • Page 11: Sub Panel Assy

    2-3. SUB PANEL ASSY 5 claws 1 PTT 2.6x6 6 CNP800 4 claw 3 PTT 2.6x6 2 PTT 2.6x6 7 sub panel assy 2-4. CD MECHANISM BLOCK 6 PTT 2.6x6 1 PTT 2.6x6 7 bracket (M/D) 2 PTT 2.6x6 4 CD mechanism block 5 PTT 2.6x6 3 CNP700 –...

  • Page 12: Main Board

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

  • 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 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 washer washers washer Fig. 1 3 roller assy 4 PS 2x3 2 arm (roller) 5 LOAD SW board 1 tension spring (RA) –...

  • 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 0 dB = 1 µV TUNER SECTION FM Auto Scan/Stop Level Adjustment Setting : SOURCE button : FM Cautions during repair When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair. FM RF signal generator TEST MODE...
  • Page 17 FM Stereo Separation Adjustment (WIDE) FM Stereo Separation Adjustment (NARROW) Setting : Setting : SOURCE button : FM1 SOURCE button : FM1 FM RF signal FM RF signal generator generator level meter level meter antenna antenna terminal 10 k Ω terminal 10 k Ω...
  • Page 18 AM Auto Scan/Stop Level Adjustment Adjustment Location : tuner unit (TU601) Setting : SOURCE n MODE button : AM –set upper view– 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω ) TU601 antenna terminal Carrier frequency : 1000 kHz AM AUTO SCAN/...

  • Page 19: Cd Section

    Focus Gain Adjustment (Coarse adjustment) CD SECTION 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

    SECTION 4 DIAGRAMS 4-1. IC PIN DESCRIPTION • IC801 MB90574PFV-G-179-BND (SYSTEM CONTROL) Pin No. Pin Name Pin Description LD ON Laser ON/OFF control output Focus OK signal detection input XLAT25 CD signal processing latch output DATA25 CD signal serial data output XRST Reset output to CD signal processor IC.
  • Page 21 Pin No. Pin Name Pin Description AMP ON Power amplifier power control output TXT ON Reset output to CD-TEXT decoder IC. VOL ATT Electric volume mute control output — Not used. (Open) System attenuate control output RC IN1 Rotary commander shift key input 1 TU ATT Tuner attenuate output (Not used in this set.) —...
  • Page 22 Pin No. Pin Name Pin Description 112, 113 — Not used. (Open) CD LD Loading motor control output (Loading direction) CD EJ Loading motor control output (Eject direction) L SW Sled limit switch detection input IN SW/(PH1) Disc insertion detection input D SW DOWN switch detection input —...

  • Page 23: Block Diagram -Cd Section

    CDX-C6850 4-2. BLOCK DIAGRAM — CD SECTION — DIGITAL SIGNAL OPTICAL PICK-UP RF AMP, SERVO CONTROL PROCESSOR D/A CONVERTER KSS-521A IC702 MAIN 35 PD1 14 RF PCMD VOUTL SECTION LRCK 59 CLKO BCKIN VOUTR R-CH 36 PD2 57 XLTO LRCIN CONV.

  • Page 24: Block Diagram -Main Section

    CDX-C6850 4-3. BLOCK DIAGRAM — MAIN SECTION — SUB OUT IC406 PJ400 ELECTRONIC VOLUME IC401 PJ400 FRONT R-CH R-CH SUBOUT+ PJ401 LINE AMP BUS AUDIO IN SUBOUT- IC402 LINE OUT TUNER ASSY TU601 SE2L OUT FL INFL OUTFL SECTION TONE...

  • Page 25: Circuit Boards Location

    CDX-C6850 • Waveforms (MODE:PLAY) 4-4. CIRCUIT BOARDS LOCATION THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) tuner unit for schematic diagram: (TU601) • All capacitors are in µF unless otherwise noted. pF: µµF SUB board Approx.

  • Page 26: Printed Wiring Boards -Cd Mechanism Section

    CDX-C6850 4-5. PRINTED WIRING BOARDS — CD MECHANISM SECTION — • Semiconductor Location Ref. No. Location (Page 35) M902 M901 (SLED) (SPINDLE) – 29 – – 30 –...

  • Page 27: Schematic Diagram -Cd Mechanism Section

    CDX-C6850 4-6. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 28 for Waveforms. • Refer to page 48 for IC Block Diagrams. note: • Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : CD PLAY ∗...

  • Page 28: Printed Wiring Board -Main Section

    CDX-C6850 4-7. PRINTED WIRING BOARD — MAIN SECTION — • Semiconductor Location Ref. No. Location Ref. No. Location (D402) IC801 D403 IC803 D-14 (D601) (IC901) F-13 (D604) (IC902) D701 (D702) F-12 Q110 (D801) B-14 Q111 (D807) B-13 Q210 D808 B-13...
  • Page 29 CDX-C6850 (Page 29) (Page 46) – 35 – – 36 –...

  • Page 30: Schematic Diagram -Main Section (1/2)

    CDX-C6850 4-8. SCHEMATIC DIAGRAM — MAIN SECTION (1/2) — • Refer to page 48 for IC Block Diagrams. note: (Page 39) • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : AM <...

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

    CDX-C6850 4-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/2) — • Refer to page 50 for IC Block Diagrams. (Page 38) (Page 47) note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : AM <...

  • Page 32: Printed Wiring Board -Display Section

    CDX-C6850 4-10. PRINTED WIRING BOARD — DISPLAY SECTION — (Page 46) • Semiconductor Location Ref. No. Location Ref. No. Location (D501) C-13 LED504 (D502) LED505 (D503) C-12 (LED510) B-4 (D504) B-10 (LED511) B-13 (D505) A-10 (D506) A-10 (Q501) (Q502) IC501...

  • Page 33: Schematic Diagram -Display Section

    CDX-C6850 4-11. SCHEMATIC DIAGRAM — DISPLAY SECTION — (Page 47) note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM – 43 – – 44 –...

  • Page 34: Printed Wiring Board -Relay Section

    CDX-C6850 4-12. PRINTED WIRING BOARD — RELAY SECTION — (Page 35) (Page 42) – 45 – – 46 –...

  • Page 35: Schematic Diagram -Relay Section

    CDX-C6850 4-13. SCHEMATIC DIAGRAM — RELAY SECTION — (Page 40) (Page 43) – 47 –...

  • Page 36: Ic Block Diagrams

    • IC Block Diagrams IC1 CXD2507AQ IC402, 403 TDA8574 VCCL BUFFER VCCL SERVO AUTO DATA SEQUENCER CL– SVRL XRST LIFT SENS BUFFER SUB CODE MUTE PROCESSOR INTERFACE SQCK DIGITAL LOCK SQSO REFERENCE VCCL TEST EXCK LGND SIGNAL SBSO FILO SCOR DIGITAL OUTL FILI...
  • Page 37 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 38 IC401 TDA7462D SE3L SE3R MUTE PAUSE PAUSE DETECT FRONT INPUT TREBLE/ VOICE BANDPASS OUT FL LOUDNESS VOLUME FADER GAIN & SOFT BASS CONTROL SE1L CONTROL AUTO MUTE CONTROL CIRCUIT CIRCUIT SE1R ZERO CIRCUIT FRONT MD– OUT FR FADER CDL+ CDL– COMPANDER CDR–...
  • Page 39 IC601 TDA7427AD1 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 40: 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. Example : mark ! or dotted line with mark. • Items marked “*” are not stocked since ! are critical for safety.

  • Page 41: 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 3-030-947-01 BUTTON (SOURCE) 3-030-950-01 BUTTON (OPEN) 3-030-943-01 KNOB (VOL) 3-032-321-01 SPRING (OPEN) 3-030-944-01 LEVER (SEEK/AMS) 3-030-942-01 BUTTON (DSPL) * 54 3-030-932-01 PLATE (LCD), GROUND 3-030-949-01 BUTTON (1-10) X-3376-696-1 PANEL ASSY, FRONT BACK...

  • Page 42: Cd Mechanism Section (1)

    5-3. CD MECHANISM SECTION (1) (MG-363T-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 43: Cd Mechanism Section (2)

    5-4. CD MECHANISM SECTION (2) (MG-363T-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) 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 44: Cd Mechanism Section (3)

    5-5. CD MECHANISM SECTION (3) (MG-363T-121) M901 M902 The components identified by Les composants identifiés par une mark ! or dotted line with mark. marque ! sont critiques pour la ! are critical for safety. sécurité. Replace only with part number Ne les remplacer que par une piéce specified.

  • Page 45: 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 the parts list may be different from the they are seldom required for routine service. mark ! or dotted line with mark.
  • Page 46 DISPLAY LIMIT SW LOAD SW MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark ∗ R533 1-216-045-00 METAL CHIP 1/10W 1-659-835-12 LIMIT SW BOARD ∗∗∗∗∗∗∗∗∗∗∗∗∗∗ R534 1-216-049-11 RES,CHIP 1/10W R535 1-216-053-00 METAL CHIP 1.5K 1/10W R536 1-216-053-00 METAL CHIP 1.5K 1/10W...
  • Page 47 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C223 1-163-038-00 CERAMIC CHIP 0.1uF C698 1-163-009-11 CERAMIC CHIP 0.001uF C224 1-163-022-00 CERAMIC CHIP 0.012uF C699 1-163-009-11 CERAMIC CHIP 0.001uF C229 1-163-009-11 CERAMIC CHIP 0.001uF C702 1-164-346-11 CERAMIC CHIP C230 1-163-009-11 CERAMIC CHIP 0.001uF...
  • Page 48 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < SURGE ABSORBER > < JUMPER RESISTOR > CP601 1-803-335-21 ABSORBER, CHIP SURGE JR602 1-216-295-00 SHORT JR611 1-216-295-00 SHORT < DIODE > JR614 1-216-295-00 SHORT JR616 1-216-295-00 SHORT D402 8-719-109-71 DIODE RD3.9ES-B1 JR620...
  • Page 49 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q907 8-729-901-05 TRANSISTOR DTA124EK R227 1-216-064-00 METAL CHIP 4.3K 1/10W Q908 8-729-027-52 TRANSISTOR DTC124EKA-T146 R228 1-216-082-00 RES,CHIP 1/10W Q909 8-729-015-11 TRANSISTOR 2SD1802FAST-TL R229 1-216-082-00 RES,CHIP 1/10W Q910 8-729-901-05 TRANSISTOR DTA124EK R230 1-216-089-00 RES,CHIP...
  • Page 50 MAIN RELAY SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R805 1-216-097-00 RES,CHIP 100K 1/10W R920 1-216-097-00 RES,CHIP 100K 1/10W R806 1-216-049-11 RES,CHIP 1/10W R925 1-216-097-00 RES,CHIP 100K 1/10W R807 1-216-049-11 RES,CHIP 1/10W R928 1-216-049-11 RES,CHIP 1/10W R808 1-216-049-11 RES,CHIP...
  • Page 51 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-163-011-11 CERAMIC CHIP 0.0015uF 10% JR05 1-216-296-00 SHORT 1-163-809-11 CERAMIC CHIP 0.047uF JR06 1-216-296-00 SHORT 1-164-004-11 CERAMIC CHIP 0.1uF JR07 1-216-296-00 SHORT 1-126-206-11 ELECT CHIP 100uF 6.3V JR08 1-216-296-00 SHORT 1-135-259-11 TANTAL.
  • Page 52 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark JR59 1-216-296-00 SHORT 1-216-081-00 METAL CHIP 1/10W JR60 1-216-296-00 SHORT 1-216-109-00 METAL CHIP 330K 1/10W JR61 1-216-296-00 SHORT 1-216-105-00 RES,CHIP 220K 1/10W JR62 1-216-296-00 SHORT 1-216-009-00 RES,CHIP 1/10W JR63 1-216-296-00 SHORT...
  • Page 53 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark ACCESSORIES & PACKING MATERIALS PARTS FOR INSTALLATION AND CONNECTIONS ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ 3-865-912-11 MANUAL, INSTRUCTION (ENGLISH) 3-014-370-21 FRAME, FITTING 3-865-914-11 MANUAL, INSTRUCTION, INSTALL (ENGLISH, 3-030-929-01 SPRING, FITTING FRENCH) 3-934-325-01 SCREW (+K 5X8 TP) X-3374-810-1 CASE ASSY 3-030-940-01 COLLAR ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗...
  • Page 54 CDX-C6850 Sony Corporation 99A0419-1 9-926-421-11 Personal & Mobile Communication Company Printed in Japan C1999. 1 – 66 – Published by Quality Assurance Dept.

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