DOWNLOAD Sony CDX-555RF / CDX-555XRF Service Manual ↓ Size: 3 MB | Pages: 48 in PDF or view online for FREE

Photo: CDX-555XRF

Model Name Using Similar Mechanism

CDX-540RF/545RF

CD Drive Mechanism Type

MG-251A-137

Optical Pick-up Name

KSS-720A

US Model

Canadian Model

CDX-555RF

E Model

CDX-555XRF

2002J0500-1

C

 2002.10

System

Compact disc digital audio

system

Transmitting frequency

88.3 MHz/88.5 MHz/
88.7 MHz/88.9 MHz/
89.1 MHz/89.3 MHz/
89.5 MHz/89.7 MHz/
89.9 MHz (switchable)

Input/output terminals  Wired remote control

(8 pin)
RF signal (FM) output
Power input (3 pin)

Current drain

800  mA (at playback)
800 mA (at disc loading /
ejecting)

Operating temperature

–10

°

C to +55

°

C

(14

°

F to 131

°

F)

Dimensions

Approx. 262 

×

 90 

×

 185 mm

(10 

3

/

8

 

×

 3 

5

/

8

 

×

 7 

3

/

8

 in.)

(w/h/d)

Mass

Approx. 2.1  kg  (4  lb.  10  oz.)

Input/output

Aerial input terminal

Aerial output cord
CD changer  input cord

Dimensions

Approx.

122 

×

 36.5 

×

 15.5 mm

(4 

3

/

8

 

×

 1 

7

/

16

 

×

 

5

/

8

 in.)

(w/h/d)

Mass

Approx. 255  g  (9  oz.)

Dimensions

Approx.

52 

×

 8.5 

×

 90 mm

(2 

1

/

16

 

×

 

3

/

8

 

×

 3 

9

/

16

 in.)

(w/h/d)

Mass

Approx. 30 g (1 oz.) not

incl. battery

Battery

Lithium battery (CR2025)

Supplied accessories

Disc magazine (1)

Parts for installation and
connections (1 set)

Laser Diode Properties

Material

GaAlAs

Wavelength

780 nm

Emission Duration

Continuous

Laser output power

Less than 44.6 

µ

W*

*

Dimensions

Approx.

40 

×

 40 

×

 27 mm

(1 

5

/

8

 

×

 1 

5

/

8

 

×

 1 

1

/

8

 in.)

(w/h/d)

Mass

Approx. 140  g  (5  oz.)

2

0

0

0

................................................

3

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

4

Installation .......................................................................

6

Connections .....................................................................

8

3-1. Disassembly Flow ...........................................................

9

3-2. Case, (Upper.T), Front Panel Assy ................................. 10
3-3. Mechanism Deck (MG-251A-137) ................................ 10
3-4. FM Board ........................................................................ 11
3-5. MAIN Board, Slide Variable Resistor

(Elevator Height Sensor) (RV202) ................................. 11

3-6. ELJ Motor Assy (Elevator) (M104) ................................ 12
3-7. Escutcheon (T) ................................................................ 12
3-8. Chassis (U.S) Sub Assy .................................................. 13
3-9. Chassis Assy .................................................................... 13
3-10. RF Board ......................................................................... 14
3-11. Sled Motor Assy (251) (M101),

Optical Pick-up (KSS-720A) .......................................... 14

3-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 15
3-13. ELJ Motor Assy (Chucking) (M103) ............................. 15

4-1. Assembly Flow ................................................................ 16
4-2. Optical Pick-up Complete Assy ...................................... 16
4-3. Gear (Lomini)/(Load 1) Assy ......................................... 17
4-4. Operation Check ............................................................. 17

.......................... 18

.......................................... 19

7-1. Block Diagram  – SERVO Section – .............................. 21
7-2. Block Diagram  – MAIN Section – ................................ 22
7-3. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 23

7-4. Printed Wiring Boards  – RF/LSW Boards – ................. 24
7-5. Schematic Diagram  – RF/LSW Boards – ...................... 25
7-6. Printed Wiring Board

– MAIN Board (Component Side) – .............................. 26

7-7. Printed Wiring Boards

– MAIN (Conductor Side)/SW Boards – ....................... 27

7-8. Schematic Diagram  – MAIN Board (1/2) – .................. 28
7-9. Schematic Diagram  – MAIN (2/2)/SW Boards – ......... 29
7-10. Printed Wiring Board  – FM Board – ............................. 30
7-11. Schematic Diagram – FM Board – ................................. 31
7-12. IC Pin Function Description ........................................... 36

8-1. General Section-1 ............................................................ 38
8-2. General Section-2 ............................................................ 39
8-3. Mechanism Deck Section-1 (MG-251A-137) ................ 40
8-4. Mechanism Deck Section-2 (MG-251A-137) ................ 41
8-5. Mechanism Deck Section-3 (MG-251A-137) ................ 42
8-6. Mechanism Deck Section-4 (MG-251A-137) ................ 43

............................... 44

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

CAUTION

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

OPTICAL
PICK-UP
BLOCK

SEMI-FIXED
RESISTOR

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.

3

The laser diode in the optical pick-up block may suffer electro-
static 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.

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
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.

This set can playback a CD-R, CD-RW for audio use.
When test this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2502-063-1)

Remove the CASE (LOWER. T) beforehand

1) Press the lever (ML.S) assy in the direction of arrow A.
2) Removal the magazine assy.

 Take out the magazine only when the tray is completely within the

magazine. If the disk or tray is sticking out, turn on the power and
eject the magazine.

Lever (ML.S) 

Magazine assy

A

Look for this mark to
distinguish CD-Rs  for  audio  use.

This mark denotes  that a disc is not for audio
use.

You cannot play a CD-R that is not
finalized*.
You cannot play CD-RWs (rewritable CDs).

* A process necessary for a recorded CD-R disc to

power supply cord 
(J-2502-058-2) 

compact disc changer

RF output cord 
(J-2502-058-1) 

wired remote commander

When repairing this set, connect the jig (cord) for RF output ex-
tract (Part No. J-2502-058-1) and power supply (Part No. J-2502-
058-2) as the figure shown below.

4

This section is extracted from
instruction manual.

Refer to the pages for details.

1

2

3

4

5

DISC NAME (disc number/disc name)
indication
The indicated disc number matches the
disc number in the disc magazine.

6

7

8

9

0

u (play/pause) button  6
If pressed during CD playback, the CD
will pause. If pressed again, CD playback
will continue.

qa

qs

Play/pause indication
Turns around during CD playback and
flashes when the pause button is pressed.

qd

qf

qg

qh

1

2

3

4

5

6

u (play/pause) button  6

7

8

9

0

qa

When the battery becomes weak, you will not
be able to operate the unit with the wireless
remote.
Battery life is approx. six months depending
on the conditions of use.

Battery may explode if mistreated.
Do not recharge, disassemble or dispose of
in fire.

• Keep the lithium battery out of the reach of

children.
Should the battery be swallowed,
immediately consult a doctor.

• Wipe the battery with a dry cloth to assure a

good contact.

• Be sure to observe the correct polarity when

installing the battery.

• Do not hold the battery with metallic

tweezers, otherwise a short circuit may
occur.

x

Replace the battery with a Sony CR2025 or
Duracell DL-2025 lithium battery. Use of
another battery may present a risk of fire or
explosion.