MEX-BT2700, MEX-BT2707E, MEX-BT2750 - Sony Car Audio Service Manual (repair manual). Page 5

NOTE  FOR  REPLACEMENT  OF  THE  BT  BOARD
When repairing, the complete BT board (A-1433-972-A) should 
be replaced since any parts in the BT board cannot be repaired.

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (A-1552-122-A) 
should be replaced since any parts in the SERVO board cannot be 
repaired.

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 the three terminals of the jack.

KEY board

AUX jack

front panel

Under normal conditions, the battery will last approximately 1 year.
(The service life may be shorter, depending on the conditions of use.)
When the battery becomes weak, the range of the card 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
• Keep the lithium battery out of the reach of children.

• Wipe the battery with a dry cloth to assure a good contact.
• Be sure to observe the correct polarity when installing the battery.
• Do not hold the battery with metallic tweezers, otherwise a short-circuit

D

Battery may explode if mistreated.
Do not recharge, disassemble, or dispose of in fire.

4-124-437-0[]

BT2700: AEP and UK models

4-124-438-0[]

BT2700: US and Canadian models

4-127-668-0[]

BT2700: Italian model

4-127-669-0[]

BT2707E: Russian model

4-127-670-0[]

BT2750: E and Saudi Arabia models

4-127-671-0[]

BT2750: Mexican model

4-127-673-0[]

BT2750: Indian model (MARUTI SUZUKI)