Sony CDX-4270-R Service manual

CDX-4270R

SERVICE MANUAL

SPECIFICATIONS

AEP Model

UK Model

Model Name Using Similar Mechanism CDX-4180R CD Drive Mechanism Type MG-363X-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

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 output (1)

Power aerial relay control lead Power amplifier control lead Telephone ATT 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 × 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

SERVICE NOTE

CAUTION

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

NOTE FOR REPLACEMENT OF COMPLETE MAIN BOARD

The complete MAIN board (A-3294-759-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

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.

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

– main board (side B) –

Solder bridge

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 ......................................................................4

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

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

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

Other Functions .......................................................................6

Connections .............................................................................8

2. DISASSEMBLY

2-1. Cover ................................................................................. 10

2-2. Front Panel Assy ............................................................... 10

2-3. Sub Panel (1) Assy ............................................................ 11

2-4. CD Mechanism Block ....................................................... 11

2-5. Main Board ....................................................................... 12

2-6. Heat Sink ........................................................................... 12

2-7. Chassis (T) Sub Assy ........................................................ 13

2-8. Lever Assy ......................................................................... 13

2-9. Servo Board....................................................................... 14

2-10. Roller Assy........................................................................ 14

2-11. Chassis (OP) (O/S) Assy ................................................... 15

2-12. Optical Pick-up Block ....................................................... 15

3. ELECTRICAL ADJUSTMENTS

Tuner Section......................................................................... 16

CD Section ............................................................................ 19

4. DIAGRAMS

4-1. IC Pin Description............................................................. 20

4-2. Block Diagram –CD Section–........................................... 22

4-3. Block Diagram –Tuner Section–....................................... 23

4-4. Block Diagram –Display Section–.................................... 24

4-5. Circuit Boards Location .................................................... 25

4-6. Printed Wiring Boards –CD Mechanism Section–............ 26

4-7. Schematic Diagram –CD Mechanism Section– ................ 27

4-8. Printed Wiring Board –Main Section–.............................. 28

4-9. Schematic Diagram –Main Section (1/3)– ........................ 30

4-10. Schematic Diagram –Main Section (2/3)– ........................ 31

4-11. Schematic Diagram –Main Section (3/3)– ........................ 32

4-12. Schematic Diagram –Display Section–............................. 33

4-13. Printed Wiring Board –Display Section– .......................... 34

5. EXPLODED VIEWS

5-1. Chassis Section ................................................................. 39

5-2. Front Panel Section ........................................................... 40

5-3. CD Mechanism Section (1) ............................................... 41

5-4. CD Mechanism Section (2) ............................................... 42

5-5. CD Mechanism Section (3) ............................................... 43

6. ELECTRICAL PARTS LIST ........................................ 44

SECTION 1

GENERAL

This section is extracted from instruction manual.

56789

SECTION 2

DISASSEMBLY

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

2-1. COVER

claw

cover

claws

claw

2-2. FRONT PANEL ASSY

front panel assy

Push the button (release).

2-3. SUB PANEL (1) ASSY

sub panel (1) assy

PTT 2.6x6

claw

PTT 2.6x6

claw

PTT 2.6x6

2-4. CD MECHANISM BLOCK

CD mechanism block

PTT 2.6x6

bracket (M/D)

PTT 2.6x6

PTT 2.6x

PTT 2.6x6

CNP700

2-5. MAIN BOARD

ground point screw

(PTT 2.6x6)

MAIN board

PTT 2.6x8

ground point screws

(PTT 2.6x6)

PTT 2.6x8

PTT 2.6x

2-6. HEAT SINK

heat sink

PTT 2.6x

PTT 2.6x8

PTT 2.6x12

2-7. CHASSIS (T) SUB ASSY

Unsolder the

lead wires.

gray

white

black

P 2x3

chassis (T) sub assy

2-8. LEVER ASSY

lever (R) assy

tension spring (LR)

lever (L) assy

guide (disc)

PS 2x4

DISC IN SW board

claws

2-9. SERVO BOARD

PS 2x4

P 2x3

loading motor assy

CN3

PS 2x4

CN2

SERVO board

2-10. ROLLER ASSY

• When installing, take note of the positions

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

PS 2x3

LOAD SW board

washer

arm

washer

Fig. 1

roller assy

arm (roller)

washers

arm

tension spring (RA)

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

compression spring (FL)

tension spring (KF1)

compression spring (FL)

tension spring (KR1)

Fit lever (D) in the

direction of the arrow.

chassis (OP) (O/S) assy

Turn loading ring in the

direction of the arrow.

damper (T)

2-12. OPTICAL PICK-UP BLOCK

P 2x3

sled motor assy

damper (T)

optical pick-up block

SECTION 3

ELECTRICAL ADJUSTMENTS

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 MW Auto Scan/Stop Level 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

3. FM RDS S-Meter Adjustment

4. MW Auto Scan/Stop Level Adjustment

FM Auto Scan/Stop Level Adjustment

Setting :

D-BASS switch : OFF SOURCE button : FM

FM RF signal

generator

antenna

terminal

0.01

Carrier frequency : 98.00 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

set

4. Adjust with the volume RV2 on TU601 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 18.

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