Backup Battery - Sony MAV-555A Maintenance Manual

3-4-4. Backup Battery

Part name : Lithium battery (CR2450)
Part number : 1-528-229-41
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Complete the battery replacement within the short time
(about 60 minutes or less) because the memory contents
are cleared after elapse of time.
Removal
1. Remove the top plate (A). (Refer to Section 3-2-2.)
2. Loosen the two screws (with drop-safe) and remove
the PWB main clamp.
PWB main clamp
Screw (with drop-safe)
MAV-555A
Screw (with drop-safe)
3. Open the board lever in the direction of the arrow and
pull out the board from which the backup battery is
going to be replaced.
Board lever
FM-81 board
4. Remove the lithium battery (CR2450).
FM-81 board : BT400
PU-121 board : BT501
Installation
Install the new lithium battery by reversing the steps of
removal.
3-4. Replacing the Main Parts
Board lever
PU-121 board
3-9 (E)