CDX-M20 - Sony Car Audio Service Manual (repair manual). Page 4

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

of the AUX jack with the holes in the KEY board.

3.  Solder 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 

YEDS-18 (for CD)

4-225-203-01 

PATD-012 (for CD)

NOTE  FOR  THE  15-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 15-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.

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 SENSOR board is defective, exchange the MECHANICAL 
BLOCK ASSY (X).

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

•  Connect the MAIN board (CN701) and the SERVO board 

(CN401) with the jig cable.

Jig cable:
Part No.

   

Description

A-1818-424-A 

EXTENSION CABLE (CD MECHA)