CDX-GT740UI, CDX-GT747UI, CDX-GT790UI - Sony Car Audio Service Manual (repair manual). Page 4

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

•  Connect the MAIN board (CN200) 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 
(CN902)
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  24-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 24-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.