Battery For Memory Backup - Sony DNW-A220 Maintenance Manual

1-14. Battery for Memory Backup

The unit is equipped with a battery for the memory (IC112) backup on the SY-259/259A board. When
replacing, be sure to use the specified part.
Replacement Part:
Part Description:
Part No.:
Recommended Replacement Period:
In the memory, the following data is stored. When the battery is dead, or replaced with a new one,
resetting current menu and menu banks 1 to 4 is required. For details on how to reset, refer to the opera-
tion manual supplied with the unit.
When the battery is dead, or replaced, error logs are all cleared.
. Current menu
. Menu banks 1 to 4
Replacement
w
When replacing the battery, ensure that a mark on the battery is correctly oriented as shown in the
following figure.
1. Disconnect the SY-259/259A board. (Refer to Section 1-8-1.)
2. Insert a flat blade driver between BT112 and IC112 to remove the battery.
3. Carefully install a new battery, ensuring that the mark's on the BT112 and IC112 are aligned.
4. Reset the current menu and menu banks. (Refer to the operation manual.)
DNW-A220
DNW-A220P
BT112/SY-259/259A board
Oscillator, crystal (in battery) M4T28-BR12SH1
1-767-156-11
Every seven years
BT112
IC112
SY-259/259A board
Driver
Mark
Mark
1-14. Battery for Memory Backup
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