Sony CDXC-4840-R, CDXC-4850-R Service manual

CDX-C4840R/C4850R

SERVICE MANUAL

Photo: CDX-C4850R

SPECIFICA TIONS

AEP Model

UK Model

Model Name Using Similar Mechanism CDX-C570R/C580R
CD Drive Mechanism Type MG-363T-121
Optical Pick-up Name KSS-521A

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

Tuner section

FM

Tuning range 87.5 – 108.0 MHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz
Usable sensitivity 12 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),

68 dB (mono)
Harmonic distortion at 1 kHz

0.8% (stereo),

0.6% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz

MW/LW

Tuning range MW: 531 – 1,602 kHz

LW: 153 – 281 kHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz / 450 kHz
Sensitivity MW: 30 µV

LW : 50 µV

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) (CDX-C4850R)

Line output (1) (CDX-C4840R)
Power aerial relay control
lead
Power amplifier control
lead
Telephone ATT control
lead (CDX-C4850R)

T one 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 × 185 mm

(w/h/d)

Mounting dimension Approx. 182 × 53 × 162 mm

(w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and

connections (1 set)

Front panel case (1)

Design and specifications are subject to change without
notice.

MICROFILM

FM/MW/LW COMPACT DISC PLAYER

– 1 –

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.

NOTE FOR REPLACEMENT OF COMPLETE MAIN BOARD

The complete MAIN board (CDX-C4850R: A-3294-583-A, CDX­C4840R: A-3294-587-A) of this set can be set to address the speci­fication for each destination by shorting or opening one solder
bridge of the MAIN board on the AEP and UK models and German
models :

AEP and UK models : short
German model : open

The solder bridge below shold be opened when replacing the com­plete MAIN board on the German model.

– main board (side B) –

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.

Solder bridge

– 2 –

TABLE OF CONTENTS

1. GENERAL

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

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

Setting the clock ...................................................................... 4

CD Player ................................................................................ 4

Radio ....................................................................................... 5

RDS ......................................................................................... 5

Other Functions ....................................................................... 7

CD/MD Unit ............................................................................ 8

Connections ........................................................................... 10

2. DISASSEMBLY

2-1. Cover ................................................................................. 12

2-2. Front Panel Assy ............................................................... 12

2-3. Sub Panel (1) Assy ............................................................ 13

2-4. CD Mechanism Block ....................................................... 13

2-5. Main Board ....................................................................... 14

2-6. Heat Sink ........................................................................... 14

2-7. Chassis (T) Sub Assy ........................................................ 15

2-8. Lever Assy......................................................................... 15

2-9. Servo Board....................................................................... 16

2-10. Roller Assy........................................................................ 16

2-11. Chassis (OP) (O/S) Assy ................................................... 17

2-12. Optical Pick-up Block ....................................................... 17

3. ELECTRICAL ADJUSTMENTS

Tuner Section.........................................................................18

CD Section ............................................................................ 21

4. DIAGRAMS

4-1. IC Pin Description............................................................. 22

4-2. Block Diagram –CD Section–........................................... 25

4-3. Block Diagram –Tuner Section–....................................... 27

4-4. Block Diagram –Display Section–.................................... 29

4-5. Circuit Boards Location .................................................... 31

4-6. Printed Wiring Boards –CD Mechanism Section–............ 33

4-7. Schematic Diagram –CD Mechanism Section– ................ 35

4-8. Printed Wiring Board –Main Section–.............................. 37

4-9. Schematic Diagram –Main Section (1/3)– ........................ 41

4-10. Schematic Diagram –Main Section (2/3)– ........................ 43

4-11. Schematic Diagram –Main Section (3/3)– ........................ 45

4-12. Schematic Diagram –Display Section–............................. 47

4-13. Printed Wiring Board –Display Section–.......................... 49

5. EXPLODED VIEWS

5-1. Chassis Section ................................................................. 55

5-2. Front Panel Section ........................................................... 56

5-3. CD Mechanism Section (1) ............................................... 57

5-4. CD Mechanism Section (2) ............................................... 58

5-5. CD Mechanism Section (3) ............................................... 59

6. ELECTRICAL PARTS LIST ........................................ 60

– 3 –

SECTION 1

GENERAL

This section is extracted
from instruction manual.

– 4 –

– 5 –

– 6 –

– 7 –

– 8 –

– 9 –

– 10 –

– 11 –

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

1

2

front panel assy

button (release)

– 12 –

6

2-3. SUB PANEL (1) ASSY

6

sub panel (1) assy

1

PTT 2.6x6

4

claw

2

PTT 2.6x6

5

claw

3

PTT 2.6x6

2-4. CD MECHANISM BLOCK

5

CD mechanism block

2

PTT 2.6x6

8

bracket (M/D)

7

PTT 2.6x6

3

PTT 2.6x6

6

PTT 2.6x

1

PTT 2.6x6

– 13 –

4

CNP700

8

2-5. MAIN BOARD

5

ground point screw

(PTT 2.6x6)

6

MAIN board

1

PTT 2.6x8

4

ground point screws

(PTT 2.6x6)

2

PTT 2.6x8

3

PTT 2.6x

2-6. HEAT SINK

5

heat sink

4

PTT 2.6x8

3

PTT 2.6x8

(C4850R)

1

PTT 2.6x8

2

PTT 2.6x12

– 14 –

2-7. CHASSIS (T) SUB ASSY

1

P 2x3

5

chassis (T) sub assy

3

4

claw

P 2x3

2

P 2x3

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

– 15 –

2-9. SERVO BOARD

4

5

PS 2x4

1

3

P 2x3

loading motor assy

CN3

6

PS 2x4

2

CN2

7

SERVO board

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)

– 16 –

k

y

2-11. CHASSIS (OP) (O/S) ASSY

8

compression spring (FL)

1

tension spring (angle)

6

Turn loading ring in the

direction of the arrow.

9

2

tension spring (KR1)

7

chassis (OP) (O/S) ass

compression spring (FL)

5

Fit lever (D) in the

direction of the arrow.

4

damper (T)

2-12. OPTICAL PICK-UP BLOCK

1

P 2x3

2

sled motor assy

3

damper (T)

3

optical pick-up bloc

– 17 –