CDX-GT930UI, CDX-GT937UI, CDX-GT980UI - Sony Car Audio Service Manual (repair manual)

2010B04-1

© 

2010.02

Model Name Using Similar Mechanism

NEW

CD Drive Mechanism Type

MG-101Z-188//Q

Optical Pick-up Name

DAX-25A

•  The tuner and CD sections have no adjustments.

(Photo: CDX-GT930UI)

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

Tuner section
FM
Tuning range:
  CDX-GT930UI: US model:
  87.5 – 107.9 MHz
  CDX-GT930UI: AEP, UK model:
  87.5 – 108.0 MHz
 CDX-GT980UI:
  87.5 – 108.0 MHz (at 50 kHz step)
  87.5 – 107.9 MHz (at 200 kHz step)
 CDX-GT937UI:
  FM1/FM2: 87.5 – 108.0 MHz (at 50 kHz step)
  FM3: 65 – 74 MHz (at 30 kHz step)
FM tuning interval:
 CDX-GT980UI:
  50 kHz/200 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz

AM
CDX-GT930UI: US model/GT980UI:
Tuning range: 
  CDX-GT930UI: US model:
  530 – 1,710 kHz
 CDX-GT980UI:
  531 – 1,602 kHz (at 9 kHz step)
  530 – 1,710 kHz (at 10 kHz step)
AM tuning interval:
 CDX-GT980UI:
  9 kHz/10 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 

μV

MW/LW
CDX-GT930UI: AEP, UK model/GT937UI:
Tuning range:
  MW: 531 – 1,602 kHz
  LW: 153 – 279 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector

– Continued on next page –

Intermediate frequency: 25 kHz
Sensitivity: MW: 26 

μV, LW: 45 μV

USB Player section
Interface: USB (Full-speed)
Maximum current: 500mA

Power amplifi er section
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output:
 52 

W 

× 4 (at 4 ohms)

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

amplifi er control terminal

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 

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.

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.

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.

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)

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 terminal
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 × 190 mm

 (7

 1/8

 

× 2 × 7

 1/2

 in.) (w/h/d)

Mounting dimensions: 
 Approx. 

182 

× 53 × 163 mm

 (7

 1/4

 

× 2

 1/8

 

× 6

 1/2

 in.) (w/h/d)

Mass: Approx. 1.7 kg (3 lb 12 oz)
Supplied accessories:
  Card remote commander: 
  RM-X172 (CDX-GT930UI: US model)
  RM-X174 (CDX-GT930UI: AEP, UK model/GT937UI)
 RM-X176 

(CDX-GT980UI)

  Parts for installation and connections (1 set)

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

 

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

 Connections 

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

8

3-1. Base 

Panel 

Assy 

 

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

3-2.  Sub Panel Assy  ...............................................................   12
3-3.   CD Mechanism Block .....................................................   13
3-4.  Driving Section (DB-F07) ..............................................   13
3-5. Main 

Board 

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

3-6. Servo 

Board 

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

3-7. Chassis 

(T) 

Sub 

Assy 

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

3-8.  Roller Arm Assy ..............................................................   15
3-9. Chassis 

(OP) 

Assy 

...........................................................  16

3-10. Chucking Arm Sub Assy .................................................   16
3-11. Sled Motor Assy ..............................................................  17
3-12.  Optical Pick-up Section ..................................................   18
3-13. Optical Pick-up ...............................................................   18

4-1.  Block Diagram –Main Section– .....................................   19
4-2.  Block Diagram –Display Section– .................................   20
4-3.  Printed Wiring Boards –Main Section (1/2)– .................   22
4-4.  Printed Wiring Board –Main Section (2/2)– ...................   23
4-5.  Schematic Diagram –Main Section (1/4)– ......................   24
4-6.  Schematic Diagram –Main Section (2/4)– ......................   25
4-7.  Schematic Diagram –Main Section (3/4)– ......................   26
4-8.  Schematic Diagram –Main Section (4/4)– ......................   27
4-9.  Printed Wiring Board –Base Panel Section– ..................   28
4-10.  Schematic Diagram –Base Panel Section– .....................   29
4-11.  Printed Wiring Board –Display Section– ........................   30
4-12.  Schematic Diagram –Display Section– ..........................   31

5-1. Main 

Section 

...................................................................  41

5-2.  Main Board Section ........................................................   42
5-2. Front 

Section 

...................................................................  43

5-3.  CD Mechanism Section (MG-101Z-188//Q) ..................   44

  ..............................   45

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.

PLAYABLE  DISCS  ON  THIS  UNIT
This unit can play CD-DA (also containing CD TEXT) and CD-
R/CD-RW (MP3/WMA/AAC fi les).

CD-DA

MP3

WMA

AAC

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.

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

•  Connect the MAIN board (CNP301) and the SERVO board 

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

NOTE  FOR  THE  OPENING  OF  THE  FRONT  PANEL
In this set, the front panel is lowered to below the bottom face 
when it is opened.
When servicing the set, place it on a stand having a height of about 
2 cm.

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (Part No. A-1554-
409-A) should be replaced since any parts in the SERVO board 
cannot be repaired.