CDX-GT16 — Sony Car Audio Service Manual (repair manual)

2008C04-1

© 

2008.03

Model Name Using Similar Mechanism

CDX-GT220/GT227EE

CD Drive Mechanism Type

MG-101TC-188//Q

Optical Pick-up Name

DAX-25A

•  The tuner and CD sections have no adjustments.

CD player section
Signal-to-noise ratio 

95 dB

Frequency response 

10 – 20,000 Hz

Wow and fl utter 

Below measurable limit

Tuner section
FM
Tuning range 

87.5 – 108 MHz

Antenna terminal 

External antenna 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

MW
Tuning range 

531 – 1,602 kHz

Antenna terminal 

External antenna connector

Intermediate frequency 

10.7 MHz/450 kHz

Sensitivity 30 

μV

SW
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

Power amplifi er section
Outputs 

Speaker outputs (sure seal connectors)

Speaker impedance 

4 – 8 ohms

Maximum power output  45 W 

× 4 (at 4 ohms)

General
Output 

Power antenna relay control terminal 

Inputs 

Antenna input terminal

 

AUX input jack (stereo mini jack)

Tone controls 

Low: ±10 dB at 100 Hz

 

High: ±10 dB at 10 kHz

Loudness 

+9 dB at 100 Hz

 

+5 dB at 10 kHz

Power requirements 

12 V DC car battery (negative ground)

Dimensions Approx. 

178 

× 50 × 179 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. 1.2 kg (2 lb. 11 oz.)

Supplied accessories 

Parts for installation and connections (1 set)

Design and specifi cations are subject to change
without notice.

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.

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.

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), CD-R/CD-
RW (MP3/WMA fi les also containing Multi Session).

CD-DA

MP3

WMA

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)

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 

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

 

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

 Connections 

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

5

3-1.  Sub Panel (LCD) Assy  ...................................................   8
3-2.   CD Mechanism Block .....................................................   8
3-3. Main 

Board 

.....................................................................   9

3-4. Servo 

Board 

....................................................................   9

3-5.  Chassis (T) Sub Assy ......................................................   10
3-6.  Roller Arm Assy ..............................................................   10
3-7. Chassis 

(OP) 

Assy 

...........................................................  11

3-8. Chucking 

Arm 

Sub 

Assy 

.................................................  11

3-9. Sled 

Motor 

Assy 

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

3-10. Optical Pick-up Section ..................................................   13
3-11. Optical Pick-up ...............................................................  13

DIAGNOSIS  FUNCTION 

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

5-1.  Block Diagram –Main Section– .....................................   17
5-2.  Block Diagram –Display Section– .................................   18
5-3.  Printed Wiring Board –Main Section– ............................   19
5-4.  Schematic Diagram –Main Section (1/3)– ......................   20
5-5.  Schematic Diagram –Main Section (2/3)– ......................   21
5-6.  Schematic Diagram –Main Section (3/3)– ......................   22
5-7.  Printed Wiring Board –Key Section– .............................   23
5-8.  Schematic Diagram –Key Section– ................................   24

6-1. Main 

Section 

...................................................................  29

6-2.  Front Panel Section .........................................................   30
6-3.  CD Mechanism Section ..................................................   31

  ..............................   32

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.

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 

(CN2) with the extension cable (Part No. J-2502-076-1).

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (A-1201-631-A) 
should be replaced since any parts in the SERVO board cannot be 
repaired.