Battery For Memory Backup - Sony BVW-55 Maintenance Manual

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1-14. Battery for Memory Backup

The unit is equipped with a battery for the memory (IC120) backup on the SY-272 board. When replac-

ing, be sure to use the specified part.

Replacement Part:

Part Description:

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, menu banks 1 to 4, and calender/clock is required. For details on how to reset,

refer to the operation manual supplied with the unit.

When the battery is dead, or replaced, error logs are all cleared.

. Current menu

. Menu banks 1 to 4

. Calender/Clock

When replacing the battery, ensure that a mark on the battery is correctly oriented as shown in the

following figure.

1. Disconnect the SY-272 board. (Refer to Section 1-8-1.)

2. Insert a flat blade driver between BT101 and IC120 to remove the battery.

3. Carefully install a new battery, ensuring that the mark's on the BT101 and IC120 are aligned.

4. Reset the current menu and menu banks. (Refer to the operation manual.)

5. Reset the calender/clock. (Refer to Section "3-3-3. Setting Mode".)

BT101/SY-272 board

M4T28-BR12SH1 (lithium battery)

1-767-156-11

Every seven years

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