CDX-GT55IP, CDX-GT55IPS, CDX-GT620IP, CDX-GT62IPW - Sony Car Audio Service Manual (repair manual)

2007L04-1

© 

2007.12

Model Name Using Similar Mechanism

CDX-GT620U/GT627UE/
GT670U/GT670US

CD Drive Mechanism Type

MG-101I-188//Q

Optical Pick-up Name

DAX-25A

•  The tuner and CD sections have no adjustments.

(Photo: CDX-GT620IP)

Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit

FM
Tuning range:
 CDX-GT62IPW/GT620IP:
  87.5 – 107.9 MHz
  CDX-GT55IP: AEP, UK model:
  87.5 – 108.0 MHz
  CDX-GT55IP: E model/GT55IPS:
  87.5 – 108.0 MHz (at 50 kHz step)
  87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval:
  CDX-GT55IP: E model/GT55IPS:
  50 kHz/200 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 
  67 dB (stereo), 69 dB (mono)
Harmonic distortion at 1 kHz: 
  0.5 % (stereo), 0.3 % (mono)
Separation: 35 dB at 1 kHz
Frequency response: 30 – 15,000 Hz

AM
CDX-GT62IPW/GT620IP:
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 

μV

MW/LW
CDX-GT55IP: AEP, UK model
Tuning range:
  MW: 531 – 1,602 kHz
  LW: 153 – 279 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency:
  10.7 MHz/450 kHz
Sensitivity:
 MW: 

30 

μV, LW: 40 μV

MW
CDX-GT55IP: E model/
GT55IPS:
Tuning range:
  531 – 1,602 kHz (at 9 kHz step)
  530 – 1,710 kHz (at 10 kHz step)
MW tuning interval:
  9 kHz/10 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 

μV

– Continued on next page –

AUDIO POWER SPECIFICATIONS 
(CDX-GT62IPW/GT620IP)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into 
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more 
than 5% total harmonic distortion.

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.

The laser diode in the optical pick-up block may suffer electrostat-
ic break-down because of the potential difference generated by the 
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also 
use the procedure in the printed matter which is included in the 
repair parts.
The fl exible 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 refl ective 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.

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

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

TEST  DISCS
Please use the following test discs for the check on the CD section.

 

YDES-18 (Part No. 3-702-101-01)

 

PATD-012 (Part No. 4-225-203-01)

SW
CDX-GT55IP: E model/GT55IPS:
Tuning range:
  SW1: 2,940 – 7,735 kHz
  SW2: 9,500 – 18,135 kHz
  (except for 10,140 – 11,575 kHz)
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 

μV

Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W × 4 (at 4 ohms)

Output:
  Audio outputs terminal (front, sub/rear switchable)
  Power antenna (aerial) relay control terminal
 Power 

amplifi er control terminal

Inputs:
  Telephone ATT control terminal
  Remote controller input terminal
  Antenna (aerial) input terminal
  AUX input jack (stereo mini jack)
  iPod signal input terminal (dock connector)
Tone controls:
  Low: ±10 dB at 60 Hz (XPLOD)
  Mid: ±10 dB at 1 kHz (XPLOD)
  High: ±10 dB at 10 kHz (XPLOD)
Power requirements: 12 V DC car battery
  (negative ground (earth))
Dimensions: Approx. 178 × 50 × 180 mm
 (7

 1/8

 × 2 × 7

 1/8

 in.) (w/h/d)

Mounting dimensions: Approx. 182 × 53 × 162 mm
 (7

 1/4

 × 2

 1/8

 × 6

 1/2

 in.) (w/h/d)

Mass: Approx. 1.3 kg (2 lb 14 oz.)
Supplied accessories:
  Card remote commander: RM-X151
  Parts for installation and connections (1 set)

0 OR  DOTTED  LINE  

0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0 SUR  

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

 

Location of Controls .......................................................   5

 Connections 

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

7

3-1.   Sub (AUX) Panel Assy  ..................................................   11
3-2.   CD Mechanism Block .....................................................   11
3-3.   Main Board .....................................................................   12
3-4. Servo 

Board 

....................................................................  12

3-5. Chassis 

(T) 

Sub 

Assy 

......................................................  13

3-6.  Roller Arm Assy ..............................................................   13
3-7. Chassis 

(OP) 

Assy 

...........................................................  14

3-8. Chucking 

Arm 

Sub 

Assy 

.................................................  14

3-9. Sled 

Motor 

Assy 

..............................................................  15

3-10.  Optical Pick-up Section ..................................................   16
3-11. Optical Pick-up ...............................................................   16

DIAGNOSIS  FUNCTION 

 .....................................   17

5-1.  Block Diagram –Main Section– .....................................   21
5-2.  Block Diagram –Display Section– .................................   22
5-3.  Printed Wiring Board –Main Section– ............................   24
5-4.  Schematic Diagram –Main Section (1/4)– ......................   25
5-5.  Schematic Diagram –Main Section (2/4)– ......................   26
5-6.  Schematic Diagram –Main Section (3/4)– ......................   27
5-7.  Schematic Diagram –Main Section (4/4)– ......................   28
5-8.  Printed Wiring Board –Sub Section- ..............................   29
5-9.  Schematic Diagram –Sub Section- .................................   30
5-10.  Printed Wiring Boards –Key Section – ...........................   31
5-11.  Schematic Diagram –Key Section – ...............................   32

6-1. Main 

Section 

...................................................................  38

6-2.  Front Panel Section .........................................................   39
6-3.  CD Mechanism Section (MG-101I-188//Q) ...................   40

  ..............................   41

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution:  The printed pattern (copper foil) may peel away if the 

heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

• 

Usable with ordinary solder

 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

This compact disc player is classifi ed as a CLASS 1 LASER 

 

 

 

 

 

product. The CLASS 1 LASER PRODUCT label is located on the 
exterior.

This label is located on the bottom of the chassis.

You can play CD-DA (also containing CD TEXT) and CD-R/
CD-RW (MP3/WMA/AAC fi les).

CD-DA

MP3

WMA

AAC

EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig (extension 
cable) as shown below.

•  Connect the MAIN board (CN350) and the SERVO board 

(CN401) with the extension cable (Part No. J-2502-076-1).

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (A-1362-921-A) 
should be replaced since any parts in the SERVO board cannot be 
repaired.

NOTE FOR REPLACEMENT OF THE AUX JACK (J901)
To replace the AUX jack requires alignment.
1.  Insert the AUX jack into the KEY board.
2.  Place the KEY board on the front panel.
3.  Solder the three terminals of the jack.

NOTE  FOR  THE  16-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 16-pin connector (CN901) connect-
ing the front panel with the main body.
Do not touch the connector directly with your bare hand. Poor con-
tact may be caused.