CDX-GT680UI, CDX-GT686UI - Sony Car Audio Service Manual (repair manual)

2008K04-1

© 

2008.11

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

FM
Tuning range:
  E, Mexican, Indian model: 87.5 – 108.0 MHz (at 50 kHz step)
   

87.5 – 107.9 MHz (at 200 kHz step)

  Saudi Arabia model: 

87.5 – 107.9 MHz

FM tuning interval:
  E, Mexican, Indian model: 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
Tuning range: 
  E, Mexican, Indian model: 531 – 1,602 kHz (at 9 kHz step)
   

530 – 1,710 kHz (at 10 kHz step)

  Saudi Arabia model: 

530 – 1,710 kHz

AM tuning interval:
  E, Mexican, Indian model: 9 kHz/10 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 

μV

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

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

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-GT680UI

– Continued on next page –

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 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 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)
  BUS 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 × 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: RM-X151
  Parts for installation and connections (1 set)

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

CD-DA

MP3

WMA

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.

 •  CD Play back

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

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.

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

 

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

 Connections 

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

6

3-1.   Sub Panel 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

4-1.  Block Diagram –Main Section– .....................................   15
4-2.  Block Diagram –Display Section– .................................   16
4-3.  Printed Wiring Board –Main Section– ............................   17
4-4.  Schematic Diagram –Main Section (1/3)– ......................   18
4-5.  Schematic Diagram –Main Section (2/3)– ......................   19
4-6.  Schematic Diagram –Main Section (3/3)– ......................   20
4-7.  Printed Wiring Board –Sub Section– ..............................   21
4-8.  Schematic Diagram –Sub Section– .................................   22
4-9.  Printed Wiring Boards –Key Section– ............................   23
4-10.  Schematic Diagram –Key Section– ................................   24

5-1. Main 

Section 

...................................................................  31

5-2.  Front Panel Section .........................................................   32
5-3.  CD Mechanism Section (MG-101Z-188//Q) ..................   33

 ...............................   34

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

•  Connect the MAIN board (CN201) 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 (Part No. A-1554-
409-A) should be replaced since any parts in the SERVO board 
cannot be repaired.

NOTE FOR REPLACEMENT OF THE USB CONNECTOR 
(CN971)
To replace the USB connector requires alignment.
1.  Insert the USB connector into the front panel.
2.  Place the KEY board on the front panel and align the terminals 

of the USB connector with the holes in the KEY board.

3.  Solder the four terminals of the connector.

NOTE  FOR  THE  20-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 20-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.