Backup Battery - Sony MAV-555 Maintenance Manual

3-4. Replacing the Main Parts

3-4-4. Backup Battery

Part name : Lithium battery (CR2450)
Part No. : 1-528-229-4x
n
Replace a battery in a short period of time (about 60
minutes) because the memory contents can be erased.
Removal
1. Attach the top plate (A). (Refer to Section 3-2-2.)
2. Loosen the four screws (with drop-safe) and the main
board retainer.
Screws (with drop-safe)
Main board
retainer
3-12 (E)
Screws (with drop-safe)
3. Open the board lever in the direction of the arrow and
pull out the board containing the backup battery to be
replaced.
PU-109 board
4. Replace the lithium battery (CR2450).
FM-68 board : BT100
PU-109 board : BT300
Installation
Attach the parts by reversing the disassembly procedure of
steps 1 through 3.
Board lever
FM-68 board
MAV-555