Backup Battery; Replacement Of Printed Circuit Boards - Sony BKDM-3020 Maintenance Manual

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3-4. Replacement of Main Parts

3-4-3. Backup Battery

To store a part of setup data and a real-time clock, Ni-Cd

batteries are installed on CPU-119 board in BKDM-3010.

To charge the Ni-Cd batteries sufficiently, turn on the

power of DME-3000/7000 about ten hours. The sufficient-

ly charged Ni-Cd batteries enable data to be stored for

about one week.

The life of a Ni-Cd battery is about ten years. Replace the

Ni-Cd battery after a lapse of ten years since this unit is

installed or the battery is last replaced. (For the replace-

ment procedure of the battery, refer to the Maintenance

Manual Part 2.)

3-4 (E)

3-5. Replacement of Printed Circuit

Boards

3-5-1. CPU-119 Board

1. Remove the bottom plate.(Refer to the section 3-2.)

2. Remove the hexagonal cap screws securing the three

D-SUB connectors at the rear of the bottom plate.

3. Remove the nine screws on the CPU-119 board, then

remove the board.

BVWH3

CPU-119 board

BVWH3

4. Install a new CPU-119 board in the reverse order of

the steps 1 through 3.

Hexagonal

cap

screws

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