CDX-GT740UI, CDX-GT747UI, CDX-GT790UI - Sony Car Audio Service Manual (repair manual). Page 2

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.

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)

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

Output:
  Audio outputs terminal (front/rear)
  Subwoofer output terminal (mono)
  Power antenna (aerial) relay control terminal
 Power 

amplifi er control terminal

Inputs:
  Remote controller input terminal
  Antenna (aerial) input terminal
  Telephone ATT control terminal
  Illumination control terminal
  BUS control input terminal
  BUS audio input terminal
  AUX input jack (stereo mini jack)
  USB signal input 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 × 182 mm
 (7

 1

/

8

 × 2 × 7 

1

/

4

 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: 
  US model: RM-X172
  AEP, UK, RU model: RM-X174
  E model: RM-X176
  Parts for installation and connections (1 set)

• Abbreviation
  RU 

: Russian model

COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE  
WITH  MARK  0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS