CDX-GT56UI - Sony Car Audio Service Manual (repair manual)

2012G33-1

© 

2012.07

•  The tuner and CD sections have no adjustments.

AUDIO POWER SPECIFICATIONS
(US model)
CEA2006 Standard
Power Output: 17 Watts RMS 

 4 at 

4 Ohms < 1 % THD + N 
SN Ratio: 80 dBA
(reference: 1 Watt into 4 Ohms)

Model Name Using Similar Mechanism

NEW

CD Drive Mechanism Type

MG-101CA-188

Optical Pick-up Name

DAX-25A

Photo: CDX-GT56UI

Tuner section
FM
Tuning range: 87.5 – 107.9 MHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 25 kHz
Usable sensitivity: 8 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 80 dB (mono)
Separation: 50 dB at 1 kHz
Frequency response: 20 – 15,000 Hz

AM
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 
  9,115 kHz or 9,125 kHz/5kHz
Sensitivity: 26 

V

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

USB Player section
Interface: USB (Full-speed)
Maximum current: 1 A

Power amplifi er section
Outputs: Speaker outputs
Speaker impedance: 4 – 8 ohms
Maximum power output: 
 52 

W 

 4 (at 4 ohms)

  Audio outputs terminal (rear/sub switchable)
  Power antenna (aerial) /

 Power 

amplifi er control terminal 

 (REM 

OUT)

  Sirius XM input terminal (CDX-GT56UI)

  Remote controller input terminal

  Antenna (aerial) input terminal

  AUX input jack (stereo mini jack)

  USB signal input connector

Power requirements: 12 V DC car battery

  (negative ground (earth))

Dimensions: Approx. 178 × 50 × 179 mm

 (7 

1

/

8

 × 2 × 7 

1

/

8

 in.) (w/h/d)

  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.)

  Remote commander: RM-X211

  Parts for installation and connections (1 set)

Design and specifi cations are subject to change

without notice.

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 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.

TEST  DISCS
Use following TEST DISC when this set confi rms the operation 
and checks it.

Part No.

   

Description

3-702-101-01 

DISC (YEDS-18), TEST (for CD)

4-225-203-01 

DISC (PATD-012), TEST (for CD)

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0  SUR  

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

2

 Connections 

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

7

3-1.   Sub Panel Assy  ...............................................................   9
3-2.   CD Mechanism Block .....................................................   10
3-3.   Main Board .....................................................................   10
3-4. Servo 

Board 

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

3-5.  Chassis (T) Sub Assy ......................................................   12
3-6.  Roller Arm Assy ..............................................................   12
3-7. Chassis 

(OP) 

Assy 

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

3-8.  Chucking Arm Sub Assy .................................................   13
3-9. Sled 

Motor 

Assy 

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

3-10.  Optical Pick-up Section ..................................................   15
3-11. Optical Pick-up ...............................................................   15

4-1.  Block Diagram –Main Section– .....................................   17
4-2.  Block Diagram –Display Section– .................................   18
4-3.  Printed Wiring Board –Main Section (1/2)– ...................   20
4-4.  Printed Wiring Boards –Main Section (2/2)– .................   21
4-5.  Schematic Diagram –Main Section (1/5)– ......................   22
4-6.  Schematic Diagram –Main Section (2/5)– ......................   23
4-7.  Schematic Diagram –Main Section (3/5)– ......................   24
4-8.  Schematic Diagram –Main Section (4/5)– ......................   25
4-9.  Schematic Diagram –Main Section (5/5)– ......................   26
4-10.  Printed Wiring Board –Key Section– .............................   27
4-11.  Schematic Diagram –Key Section– ................................   28

5-1. Main 

Section 

...................................................................  39

5-2.  Front Panel Section .........................................................   40
5-3.  CD Mechanism Section (MG-101CA-188) ....................   41

 ..................................   42

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.

EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig cable (exten-
sion cable (CD mecha)) as shown below.

•  Connect the MAIN board (CN700) and the SERVO board 

(CN401) with the jig cable.

Jig cable:
Part No.

   

Description

A-1818-424-A 

EXTENSION CABLE (CD MECHA)

NOTE FOR REPLACEMENT OF THE USB CONNECTOR 
(CN902)  AND  THE  AUX  JACK (J901)
To replace the USB connector and the AUX jack requires align-
ment.
1.  Insert the USB connector and the AUX jack into the front pan-

el.

2.  Place the KEY board on the front panel and align the terminals 

of the USB connector and the AUX jack with the holes in the 
KEY board.

3.  Solder the seven terminals of the connector and three terminals 

of the jack.

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board should be replaced 
since any parts in the SERVO board cannot be repaired.

NOTE  FOR  REPLACEMENT  OF  THE  SENSOR  BOARD
When the SENSOR board is defective, exchange the MECHANI-
CAL BLOCK (Z) ASSY 08 (Former type) or MECHANICAL 
BLOCK (11CA) ASSY (New type).

Note: As for the mechanism deck (MG-101CA-188) carried in this 

unit, component parts have been changed from the midway 
of production. When you perform repair exchange of the 
mechanism deck (MG-101CA-188), refer to “ABOUT THE 
MG-101CA-188 OF FORMER AND NEW” on page 5.

The unit may not function properly if the connectors 
between the unit and the front panel are not clean. In order 
to prevent this, detach the front panel and clean the 
connectors with a cotton swab. Do not apply too much force. 
Otherwise, the connectors may be damaged. 

t For safety, turn off the ignition before cleaning the connectors, 
  and remove the key from the ignition switch.
t Never touch the connectors directly with your fingers or with 
  any metal device.

NOTE  THE  MAIN  BOARD  OR  SYSTEM  CONTROLLER 
(IC501) REPLACING
When the MAIN board or system controller (IC501) is replaced, 
the destination setting is necessary. 

Set destination according to the procedure below.

1-1.  Setting the Destination Code
1.  In the state of source off (the clock is displayed), enter the test 

mode by pressing the buttons in order of the [4] 

t [5] t [6] 

(press only the [6] button for two seconds).

2.  In the state in which the system controller version is displayed 

on the liquid crystal display, enter the destination setting mode 
by pressing the buttons in order of the [SEEK +] 

t [SEEK –] 

t [PUSH ENTER/SELECT].

3.  Input the alphanumeric character of 12 digits of “F    XXXXXX” 

displayed on the liquid crystal display, and execute the destina-
tion setting.

Note: Refer to following “1-3. Entering the Destination Code” for opera-

tion method.

4.  The resetting operation is executed by pressing the [SOURCE/

OFF] button for 1 second after the setting ends, and the unit 
returns to the normal condition.

1.  Rotate the control dial, and select the alphanumeric character 

of “0 to F”.

2.  The digit advances by pressing the [PUSH ENTER/SELECT] 

or [SEEK +] button.

 

The digit returns by pressing the [ ] or [SEEK –] button.

3.  The setting is completed by pressing the [PUSH ENTER/

SELECT] button, and the initialization operation is done.

1. Press 

the 

[ ] or [ ] button, and select the alphanumeric char-

acter of “0 to F”.

2.  The digit advances by pressing the [

] button.

 

The digit returns by pressing the [

] button.

3.  The setting is completed by pressing the [ENTER] button, and 

the initialization operation is done.

CDX-GT56UI

US, Canadian

0

1

C

3

1

2

CDX-GT56UIW US

0

1

C

3

2

2

2. Confi rmation After Destination Setting
Execute the following operation after completing the destination 
setting, and confi rm a correct destination was set.

Destination setting checking method:
1.  In the state of source off (the clock is displayed on the liquid 

crystal display),  enter the test mode by pressing the buttons in 
order of the [4] 

t [5] t [6] (press only the [6] button for two 

seconds).

2.  In the state in which the system controller version is displayed 

on the liquid crystal display, enter the destination setting value 
display mode by pressing the [DSPL] button.

3.  Confi rm the alphanumeric character of 12 digits of “F    XXXXXX” 

displayed in liquid crystal display is an value correctly input.

4.  The resetting operation is executed by pressing the [SOURCE/

OFF] button for 1 second after the confi rming ends, and the 
unit returns to the normal condition.