Sony CDXC-680 Service manual

CDX-C680/C780

SERVICE MANUAL

Ver 1.1 2001. 08

Photo : CDX-C680

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

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.

US Model

Model Name Using Similar Mechanism NEW
CD Drive Mechanism Type MG-363S-121
Optical Pick-up Name KSS-520A

Other specifications
CD player section

System Compact disc digital audio

system
Signal-to-noise ratio 99 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

FM

Tuning range 87.5 - 107.9 MHz
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 62 dB (stereo),

65 dB (mono)
Harmonic distortion at 1 kHz

0.9% (stereo),

0.5% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 - 15,000 Hz
Capture ratio 2 dB

AM

Tuning range 530 - 1,710 kHz
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 –

9-925-779-12

2001H0400-1
© 2001. 8

FM/AM COMPACT DISC PLAYER

Sony Corporation

e Vehicle Company
Shinagawa Tec Service Manual Production Group

– 1 –

General

Outputs EQ output (C780)

Line outputs (3)
Power antenna relay
control lead
Power amplifier control
lead
Telephone ATT control
lead
Illumination control lead

Tone controls Bass ±8 dB at 100 Hz

Treble ±8 dB at 10 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 Parts for installation and

connections (1 set)

Front panel case (1)

Design and specifications are subject to change without
notice.

SERVICE NOTE

NOTES ON CLEANING THE OBJECTIVE LENS

cotton swabs

optical pick-up

slide base

objective lens

2-axis actuator

2-axis cover

Apply CD lens cleaner B-4 (Part No.:J-2501-000-A) to cotton swabs
(narrow type) (Part No.:J-2501-023-A) to be lightly wet. Use a force
(about 5 g (0.18 oz)) to make the objective lens in contact with the
bottom lightly, and clean the lens by spirals as following below.
Replace the cotton swab and repeat this cleaning two or three times.

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.

surface of objective lens

Notes:

Do not force to push the objective lens. Otherwise, the plate spring
supporting the objective lens will be bent, causing a deteriorated
RF waveform.
Never touch anything other than the objective lens. Otherwise, a
significant deterioration occurs in the RF waveform.

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.

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.

– 2 –

TABLE OF CONTENTS

1. GENERAL

Location of Controls................................................................ 4

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

Setting the Clock ..................................................................... 5

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

Radio ....................................................................................... 8

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

CD/MD Unit.......................................................................... 11

DSP........................................................................................ 14

TV/Video ............................................................................... 17

Connections ........................................................................... 19

2. DISASSEMBLY

2-1. Cover ................................................................................. 21

2-2. Front Panel Assy ............................................................... 21

2-3. Mechanism Block ............................................................. 22

2-4. Sub Panel Assy.................................................................. 22

2-5. Main Board ....................................................................... 23

2-6. Heat Sink ........................................................................... 23

2-7. Chassis (T) Sub Assy ........................................................ 24

2-8. Lever Assy.........................................................................24

2-9. Servo Board....................................................................... 25

2-10. Roller Assy........................................................................ 25

2-11. Chassis (OP) (O/S) Assy ................................................... 26

2-12. Optical Pick-up Block ....................................................... 26

3. ELECTRICAL ADJUSTMENTS

Tuner Section.........................................................................27

4. DIAGRAMS

4-1. IC Pin Descriptions ........................................................... 30

4-2. Circuit Boards Location .................................................... 36

4-3. Block Diagram –CD Section–........................................... 37

4-4. Block Diagram –Display Section–.................................... 39

4-5. Block Diagram –Tuner Section–....................................... 41

4-6. Printed Wiring Boards –CD Mechanism Section–............ 43

4-7. Schematic Diagram –CD Mechanism Section– ................ 47

4-8. Schematic Diagram –Main Section–................................. 52

4-9. Printed Wiring Boards –Main Section– ............................ 57

4-10. Printed Wiring Board –Display Section–.......................... 62

4-11. Schematic Diagram –Display Section–............................. 64

5. EXPLODED VIEWS

5-1. Chassis Section ................................................................. 71

5-2. Front Panel Section ........................................................... 72

5-3. CD Mechanism Section (1) ............................................... 73

5-4. CD Mechanism Section (2) ............................................... 74

5-5. CD Mechanism Section (3) ............................................... 75

6. ELECTRICAL PARTS LIST ........................................ 76

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SECTION 1

GENERAL

This section extracted from
CDX-C780's instruction manual.

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SECTION 2

DISASSEMBLY

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

2-1. COVER

1

claw

3

claws

4

cover

2

claw

2-2. FRONT PANEL ASSY

3

Push the bearing (L).

4

front panel assy

1

Push the button (open).

2

Push the bearing (R).

– 21 –

2-3. MECHANISM BLOCK

4

sub panel assy

5

PTT 2.6x6

3

claws

7

CN401

8

mechanism block

2

2-4. SUB PANEL ASSY

PTT 2.6x6

1

PTT 2.6x6

6

PTT 2.6x6

3

EL inverter unit

2

CN602

1

PTT 2.6x6

7

sub panel assy

– 22 –

6

5

claw

4

PTT 2.6x6

CN801

2-5. MAIN BOARD

4

(PTT 2.6x6)

5

MAIN board

ground point screw

1

PTT 2.6x10

3

ground point screws

(PTT 2.6x6)

2

PTT 2.6x10

2-6. HEAT SINK

5

heat sink

2

cord (with connector) (ANTENNA)

1

cord (with connector) (EQ OUT)

(C780)

3

PTT 2.6x10

4

PTT 2.6x10

– 23 –

2-7. CHASSIS (T) SUB ASSY

1

P 2x3

2

P 2x3

3

chassis (T) sub assy

2-8. LEVER ASSY

5

6

lever (R) assy

3

tension spring (LR)

7

lever (L) assy

guide (disc)

1

PS 2x4

2

DISC IN SW board

4

claws

– 24 –

2-9. SERVO BOARD

1

PS 2x4

7

loading motor assy

2

PS 2x5

5

CN6

!™

SERVO board

!º

6

P 2x3

CN4

3

PS 2x5

4

!¡

heat sink

8

PS 2x4

9

CN5

CN2

2-10. ROLLER ASSY

• When installing, take note of the positions

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

4

PS 2x3

5

LOAD SW board

washer

arm washer

3

roller assy

2

arm (roller)

armwashers

Fig. 1

1

tension spring (RA)

– 25 –