SONY CDX-C8850 Service Manual

CDX-C8850/C9500

SERVICE MANUAL

Photo: CDX-C9500

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (US Model)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION 19 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.

US Model

CDX-C8850

E Model

CDX-C9500

Model Name Using Similar Mechanism CDX-C880 CD Drive Mechanism Type MG-363S-121 Optical Pick-up Name KSS-521A

Other Specifications CD player section

System Compact disc digital audio

system Signal-to-noise ratio 98 dB Frequency response 10 – 20,000 Hz Wow and flutter Below measurable limit Laser Diode Properties Material GaAlAs Wavelength 780 nm Emission Duration Continuous Laser output 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.

Tuner section

Tuning range CDX-C8850:

87.5 – 107.9 MHz

CDX-C9500:

FM tuning interval:

50 kHz/200 kHz switchable

87.5 – 108.0 MHz

(at 50 kHz step)

87.5 – 107.9 MHz

(at 200 kHz step) Antenna terminal External antenna connector Intermediate frequency 10.7 MHz Usable sensitivity 8 dBf Selectivity 75 dB at 400 kHz

50 dB at 200 kHz Signal-to-noise ratio 65 dB (stereo),

68 dB (mono) Harmonic distortion at 1 kHz

0.7% (stereo),

0.4% (mono) Separation 35 dB at 1 kHz Frequency response 30 – 15,000 Hz

Tuning range CDX-C8850:

530 – 1,710 kHz CDX-C9500: AM tuning interval: 9 kHz/10 kHz switchable 531 – 1,602 kHz (at 9 kHz step) 530 – 1,710 kHz

(at 10 kHz step) Antenna terminal External antenna connector Intermediate frequency 10.71 MHz/450 kHz Sensitivity 30 µV

Power amplifier section

Outputs Speaker outputs

(sure seal connectors) Speaker impedance 4 – 8 ohms Maximum power output 45 W × 4 (at 4 ohms)

– Continued on next page –

FM/AM COMPACT DISC PLAYER

MICROFILM

General

Outputs Line outputs (3)

Power antenna relay control lead Power amplifier control lead Telephone ATT control lead Illumination control lead

Equalizer ±12 dB; f0 = 62 Hz, 157 Hz,

396 Hz, 1.0 kHz, 2.51 kHz,

6.34 kHz, 16 kHz

Power requirements 12 V DC car battery

(negative ground)

Dimensions Approx. 178 × 50 × 182 mm

(7 1/8 × 2 × 7 1/4 in.) (w/h/d)

Mounting dimension Approx. 182 × 53 × 163 mm

(7 1/4 × 2 1/8 × 6 1/2 in.)

(w/h/d) Mass Approx. 1.4 kg (3 lb. 1 oz.) Supplied accessories Rotary commander RM-X4V (1)

Wireless remote RM-X47 (1)

(CDX-C8850)

Card remote commander

RM-X49 (1) (CDX-C9500)

Microphone (1)

Parts for installation and

connections (1 set)

Front panel case (1)

Design and specifications are subject to change without notice.

SERVICE NOTE

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Notes on Chip Component Replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic breakdown and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

NOTES ON PICK-UP FLEXIBLE BOARD

The pick-up flexible board in this set is secured to the optical pickup with an adhesive tape. Once the tape is removed, an adhering force becomes weak, and it cannot be reused. Therefore, if the optical pick-up is replaced, replace also the pickup flexible board with a new one.

SAFETY-RELATED COMPONENT WARNING!!

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 P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

TABLE OF CONTENTS

1. GENERAL

Location of controls................................................................. 4

Getting Started......................................................................... 4

Setting the clock ...................................................................... 5

CD Player ................................................................................ 5

Radio ....................................................................................... 6

Voice Drive .............................................................................. 7

Voice Memo............................................................................. 7

DSP.......................................................................................... 7

Other Functions ....................................................................... 9

CD/MD Unit ............................................................................ 9

TV/Video ............................................................................... 11

Additional Information .......................................................... 12

Connections ........................................................................... 13

2. DISASSEMBLY

2-1. Sub Panel Assy .................................................................. 15

2-2. Mechanism Block ............................................................. 15

2-3. Main Board, Power Board.................................................16

2-4. Heat Sink ........................................................................... 16

2-5. Chassis (T) Sub Assy ........................................................ 17

2-6. Lever Assy ......................................................................... 17

2-7. Servo Board....................................................................... 18

2-8. Roller Assy........................................................................ 18

2-9. Chassis (OP) (O/S) Assy ................................................... 19

2-10. Optical Pick-up Block ....................................................... 19

3. ELECTRICAL ADJUSTMENTS

Tuner Section.........................................................................20

4. DIAGRAMS

4-1. IC Pin Descriptions ........................................................... 23

4-2. Block Diagram –CD Section–........................................... 35

4-3. Block Diagram –Display Section–.................................... 36

4-4. Block Diagram –Tuner Section–....................................... 37

4-5. Circuit Boards Location .................................................... 38

4-6. Schematic Diagram –CD Mechanism Section (1/3)– ....... 39

4-7. Schematic Diagram –CD Mechanism Section (2/3)– ....... 40

4-8. Schematic Diagram –CD Mechanism Section (3/3)– ....... 41

4-9. Printed Wiring Boards –CD Mechanism Section–............ 42

4-10. Printed Wiring Board –Main Section– .............................. 44

4-11. Schematic Diagram –Main Section (1/5)– ........................ 46

4-12. Schematic Diagram –Main Section (2/5)– ........................ 47

4-13. Schematic Diagram –Main Section (3/5)– ........................ 48

4-14. Schematic Diagram –Main Section (4/5)– ........................ 49

4-15. Schematic Diagram –Main Section (5/5)– ........................ 50

4-16. Schematic Diagram –Power Section– ............................... 51

4-17. Printed Wiring Board –Power Section– ............................ 52

4-18. Printed Wiring Board –Relay Section– ............................. 53

4-19. Schematic Diagram –Relay Section–................................ 54

4-20. Schematic Diagram –Display Section–............................. 55

4-21. Printed Wiring Board –Display Section– .......................... 56

5. EXPLODED VIEWS

5-1. Chassis Section ................................................................. 63

5-2. Front Panel Section ........................................................... 64

5-3. CD Mechanism Section (1) ............................................... 65

5-4. CD Mechanism Section (2) ............................................... 66

5-5. CD Mechanism Section (3) ............................................... 67

6. ELECTRICAL PARTS LIST ........................................ 68

SECTION 1

GENERAL

This section is extracted from instruction manual.

56789101112131415

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. SUB PANEL ASSY

claws

PTT 2.6x6

CN251

PTT 2.6x6

2-2. MECHANISM BLOCK

bracket (mechanism deck)

sub panel assy

mechanism block

PTT 2.6x6

claw

PTP 2.6x6

B 2.6x3

CN201

B 2.6x3

2-3. MAIN BOARD, POWER BOARD

ground point screw

claws

(PTT 2.6x6)

claws

bracket (power)

CN401

POWER board

MAIN board

PTT 2.6x10

ground point screws

(PTT 2.6x6)

sheet (insulating)

PTT 2.6x1

2-4. HEAT SINK

heat sink

CN101

CN291

PTT 2.6x10

cord (with connector) (ANTENNA)

cord (with connector) (RCA)

(SUB OUT)

PTT 2.6x10

2-5. CHASSIS (T) SUB ASSY

P 2x3

chassis (T) sub assy

P 2x3

claw

P 2x3

2-6. LEVER ASSY

lever (R) assy

tension spring (LR)

lever (L) assy

guide (disc)

PS 2x4

DISC IN SW board

claws

2-7. SERVO BOARD

loading motor assy

heat sink

!¡

SERVO board

PS 2x4

CN4

P 2x3

wire

PS 2x4

CN2

CN5

2-8. ROLLER ASSY

• When installing, take note of the positions

arm (roller) and washers. (Fig. 1)

PS 2x3

LOAD SW board

washer

arm washer

roller assy

arm (roller)

armwashers

Fig. 1

tension spring (RA)

2-9. CHASSIS (OP) (O/S) ASSY

compression spring (FL)

tension spring (angle)

Turn loading ring in the

direction of the arrow.

chassis (OP) (O/S) assy

compression spring (FL)

Fit lever (D) in the

direction of the arrow.

damper (T)

2-10. OPTICAL PICK-UP BLOCK

sled motor assy

P 2x3

damper (T)

optical pick-up block

SECTION 3

ELECTRICAL ADJUSTMENTS

CD SECTION

CD section adjustments are done automatically in this set.

TUNER SECTION

0 dB = 1 µV

Cautions during repair

When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.

TEST MODE

This set have the test mode function. In the test mode, FM Auto Scan/Stop Level and AM Auto Scan/Stop Le vel adjustments can be performed easier than it in ordinary procedure.

1. Set the “OFF” mode.

2. Push the preset 4 button.

3. Push the preset 5 button.

4. Press the preset 1 button for more than two seconds.

5. Then the display indicates all lights, the test mode is set.

1. Push the OFF button.

Note on Adjustment

The adjustments of tuner section, should be performed according to the following sequence.

1. FM Auto Scan/Stop Level Adjustment

2. FM Stereo Separation Adjustment (WIDE)

3. FM Stereo Separation Adjustment (NARROW)

4. AM Auto Scan/Stop Level Adjustment

FM Auto Scan/Stop Level Adjustment

Setting :

SOURCE button : FM 97.9 (MHz) FREQUENCY SELECT switch (CDX-C9500) : FM200K

FM RF signal generator

antenna

terminal

set

0.01

Carrier frequency : 97.9 MHz Output level : 22 dB (12.6 µV) Mode : mono Modulation : 1 kHz, 22.5 kHz deviation (30%)

Procedure :

1. Set to the test mode.

2. Push the SOURCE button and set to FM. Display

SHUF

3. Push the preset 3 button. Display

SHUF

4. Adjust with the volume RV2 on TU101 so that the “FM”

indication turns to “FM0” indication on the display window. But, in case of already indicated “FM0”, turn the RV2 so that put out light “0” indication and adjustment.

Display

SHUF

Adjustment Location : See page 22.

FM Stereo Separation Adjustment (WIDE)

Setting :

SOURCE button : FM1 87.5 (MHz) FREQUENCY SELECT switch (CDX-C9500) : FM200K

FM Stereo Separation Adjustment (NARROW)

Setting :

SOURCE button : FM1 87.5 (MHz) FREQUENCY SELECT switch (CDX-C9500) : FM200K

FM RF signal generator

0.01

Carrier frequency : 87.5 MHz Output level : 70 dB (3.2 mV) Mode : stereo Modulation : main : 1 kHz, 33.75 kHz deviation (45%)

sub : 1 kHz, 33.75 kHz deviation (45%) 19 kHz pilot : 7.5 kHz deviation (10%)

antenna terminal

set

LINE OUT REAR

10 k

level meter

Ω

Procedure :

FM stereo

signal generator

output channel

Level meter Level meter

connection reading (dB)

L-CH L-CH A

R-CH L-CH Adjust RV3 on TU101

for minimum reading.

R-CH R-CH C

L-CH R-CH Adjust RV3 on TU101

for minimum reading.

L-CH stereo separation : A – B R-CH stereo separation : C – D The separations of both channels should be equal.

Specification : Separation more than 24 dB

Adjustment Location : See page 22.

FM RF signal generator

0.01

Carrier frequency : 87.5 MHz Output level : 70 dB (3.2 mV) Mode : stereo Modulation : main : 1 kHz, 33.75 kHz deviation (45%)

sub : 1 kHz, 33.75 kHz deviation (45%) 19 kHz pilot : 7.5 kHz deviation (10%)

antenna terminal

set

LINE OUT REAR

10 k

level meter

Ω

Procedure :

1. Push the SHIFT button.

2. Push the 4 button three times.

3. Push the 5 button twice and set to NARROW mode.

FM stereo

signal generator

output channel

Level meter Level meter

connection reading (dB)

L-CH L-CH A

R-CH L-CH Adjust RV4 on TU101

for minimum reading.

R-CH R-CH C

L-CH R-CH Adjust RV4 on TU101

for minimum reading.

L-CH stereo separation : A – B R-CH stereo separation : C – D The separations of both channels should be equal.

Specification : Separation more than 18 dB

Adjustment Location : See page 22.

AM Auto Scan/Stop Level Adjustment

Setting :

SOURCE n MODE button : AM 1000 (kHz) FREQUENCY SELECT switch (CDX-C9500) : AM10K

Adjustment Location : tuner unit (TU101)

AM RF signal generator

Carrier frequency : 1000 kHz 30% amplitude modulation by 1 kHz signal output level : 33 dB (44.7 µV)

AM dummy antenna (50

Ω

Procedure :

1. Set to the test mode. (See page 20.)

2. Push the SOURCE button.

3. Push the MODE button and set to AM. Display

SHUF

15 pF

Ω

65 pF

)

set

antenna terminal

AM AUTO SCAN/

STOP LEVEL ADJ

FM AUTO SCAN/

STOP LEVEL ADJ

SEPARATION ADJ

TU101

RV1

RV2

RV3

FM STEREO

(WIDE)

–set upper view–

4. Push the preset 3 button. Display

SHUF

5. Adjust with the volume RV1 on TU101 so that the “AM”

indication turns to “AM0” indication on the display window. But, in case of already indicated “AM0”, turn the RV1 so that put out light “0” indication and adjustment.

Display

SHUF

Adjustment Location : tuner unit (TU101)

FM STEREO

RV4

SEPARATION ADJ

(NARROW)

SECTION 4

DIAGRAMS

4-1. IC PIN DESCRIPTIONS

• IC501 CXD2548R (DIGITAL SERVO, DIGITAL SIGNAL PROCESSOR) (SERVO BOARD)

Pin No. Pin Name I/O Pin Description

1 SYSM I System mute input (Not used.) 2 RMUT1 O R-ch, “0” detection output. (“H” : ON, “L” : OFF) (Not used.) 3 LMUT2 O L-ch, “0” detection output. (“H” : ON, “L” : OFF) (Not used.) 4 CKOUT O Master clock frequency division output (Not used.) 5 VDD0 — Digital power supply 6 SBSO O Serial output of sub-P to W. 7 EXCK I Clock input for SBSO read output. 8 SQCK I Clock input for SQSO read output.

9 SQSO O SubQ 80 bit, PCM peak and level data 16 bit output. 10 SENS O SENS output. Output to CPU. 11 SCLK I Clock input for SENS real data read. 12 DATA I Serial data input from CPU. 13 XLAT I Latch input from CPU. Latch serial data at the falling edge. 14 CLOK I Serial data transfer clock input from CPU. 15 XRST I System reset (“L” : Reset) 16 ACDT O Not used. 17 PWM1 I External control input of spindle motor. 18 XLON O Microcomputer extension interface (Output) (Not used.) 19 SPOA I Microcomputer extension interface (Input A) (Not used.) 20 WFCK O WFCK (Write Flame Clock) output 21 GTOP O GTOP output 22 XUGF O XUGF output (Not used.) 23 XPCK O XPLCK output (Not used.) 24 GFS O GFS output 25 RFCK O RFCK output 26 C2PO O C2PO output (Not used.) 27 XROF O XROF output 28 SCOR O “H” output at either detection, sub code sync S0 or S1. 29 MNT0 O MNT0 output (Not used.) 30 MNT1 O MNT1 output (Not used.) 31 MNT3 O MNT3 output (Not used.) 32 VSS1 — Digital GND 33 DOUT O Digital-Out output 34 ATSK I For anti-shock. 35 MIRR O Mirror signal output (Not used.) 36 DFCT O Diffect signal output (Not used.) 37 FOK O Focus OK signal output 38 VDD1 — Digital power supply 39 VPCO1 O Charge pump output for wideband EFM PLL. 40 VPCO2 O VCO2 charge pump output for wideband EFM PLL. 41 VCK.I I VCO2 oscillator input for wideband EFM PLL. 42 V16M O VCO2 oscillator output for wideband EFM PLL. 43 VCTL I VCO2 control input for wideband EFM PLL. 44 PCO O Charge pump output for master PLL. 45 FILO O Filter output for master PLL (slave = digital PLL). 46 FILI I Filter input for master PLL. 47 AVSS4 — Analog GND 48 CLTV I VCO control voltage input for master. 49 AVDD4 — Analog power supply 50 RFAC I EFM signal input 51 BIAS I Asymmetry circuit constant current input

Pin No. Pin Name I/O Pin Description

52 ASY.I I Asymmetry comparate voltage input 53 ASY.O O EFM full-swing output (“L” : VSS, “H” : VDD) 54 VC I Center voltage input 55 FE I Focus error signal input 56 SE I Sled error signal input 57 TE I Tracking error signal input 58 CE I Center error signal input 59 RFDC I RF signal input 60 RFC I Condenser connection pin for LPF time constant of RF signal. 61 ADIO O OP amplifier output (Not used.) 62 AVSS3 — Analog GND 63 IGEN I Current source reference resistor connection for OP amplifier. 64 AVDD3 — Analog power supply

65, 66 TES2, 3 I TEST pin (Fixed at “L”.)

67 VSS2 — Digital GND 68 TEST I TEST pin (Fixed at “L”.) 69 SFDR O Sled drive output 70 SRDR O Sled drive output 71 TFDR O Tracking drive output 72 TRDR O Tracking drive output 73 FFDR O Focus drive output 74 FRDR O Focus drive output 75 VDD2 — Digital power supply 76 COUT O Track number count signal output (Not used.) 77 LOCK O Not used. 78 MDS O Servo control output of spindle motor. (Not used.) 79 MDP O Servo control output of spindle motor. 80 SSTP I Disc most inner track detection signal input 81 FSTO O 2/3 frequency division output of pins 103 and 104. 82 FSTI I Reference clock input for digital servo. 83 XTSL I X’tal select input (“L” : 16.9344 MHz) 84 C4M O 4.2336 MHz output 85 WDCK O D/A interface. Word clock f = 2Fs 86 VDD3 — Digital power supply 87 LRCK O D/A interface. LR clock f = Fs 88 LRCKI I LR clock input to DAC. (48 bit slot) (Connect to GND.) 89 PCMD O D/A interface. Serial data (2’s COMP, MSB first) 90 PCMDI I Audio data input to DAC. (48 bit slot) (Connect to GND.) 91 BCK O D/A interface. Bit clock 92 BCKI I Bit clock input to DAC. (48 bit slot) (Connect to GND.) 93 EMPH O Not used. 94 EMPHI I De-emphasis ON/OFF of DAC. (“H” : ON, “L” : OFF) (Connect to GND.) 95 VSS3 — Digital GND 96 A VSS1 — L-ch, Analog GND. 97 AVDD1 — L-ch, Analog power supply. 98 AOUT1 O L-ch, Analog output. (Not used.)

99 AIN1 I L-ch, OP amplifier input. (Connect to GND.) 100 LOUT1 O L-ch, LINE output. (Not used.) 101 A VSS1 — L-ch, Analog GND. 102 XVDD — Analog power supply for master clock. 103 XTAI I X’tal oscillator input of master clock (16.9344 MHz). 104 XTAO O X’tal oscillator output of master clock. (Not used.) 105 XVSS — Analog GND for master clock. (Connect to GND.)

Pin No. Pin Name I/O Pin Description

106 A VSS2 — R-ch, Analog GND. 107 ROUT2 O R-ch, LINE output. (Not used.) 108 AIN2 I R-ch, OP amplifier input. (Connect to GND.) 109 AOUT2 O R-ch, Analog output. (Not used.) 110 AVDD2 — R-ch, Analog power supply. 111 A VSS2 — R-ch, Analog GND. 112 VSS0 — Digital GND

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