CDX-GT522U, CDX-GT527U - Sony Car Audio Service Manual (repair manual). Page 5

NOTE  FOR  REPLACEMENT  OF  THE  USB  CONNEC-
TOR (CN903)  AND  AUX  JACK (J901)
To replace the USB connector and AUX jack requires alignment.
1.  Insert the USB connector and AUX jack into the front panel.
2.  Place the KEY board on the front panel and align the terminals 

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

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

the jack.

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)

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 ASSY.

REPLACING  THE  LITHIUM  BATTERY  OF 
THE  REMOTE  COMMANDER
When the battery becomes weak, the range 
of the remote commander becomes shorter. 
Replace the battery with a new CR2025 
lithium battery. Use of any other battery 
may present a risk of fire or explosion.

Notes on the lithium battery
t ,eep the lithium battery out of the reach of 

children. Should the battery be swallowed, 
immediately consult a doctor.

t 8ipe the battery with a dry cloth to assure a 

good contact.

t #e sure to observe the correct polarity when 

installing the battery.

t %o not hold the battery with metallic tweezers, 

otherwise a short-circuit may occur.

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   
DPOOFDUPSTXJUIBDPUUPOTXBC%POPUBQQMZ 
too much force. Otherwise, the connectors 
may be damaged.

WARNING
#Bttery may explode if mistreated.
%POPt recharge, disassemble, or dispose 
of in fire.

t 'or safety, turn off the ignition before cleaning 

the connectors, and remove the key from the 
ignition switch.

t /ever touch the connectors directly with your 

fingers or with any metal device.