BusinessPhone Communication Platform 4.0
Maintenance Instruction ASB 150 02

## Replacement Of Batteries

The only components in the PBX requiring maintenance are the batteries used as power backup for the entire system and the battery on the VMU-boards.

To ensure sufficient battery capacity in the event of power failure, the batteries must be replaced periodically.

The replacement period for the power supply battery backup of the PBX, and for the battery on the VMU-board (ROF 157 5117/1) are five years.

For more information of the power supply battery backup of the PBX, see documents

- Installation Instruction (1531-BML BS 101 01),
- Installation Instruction (1531-BDV 113 08),
- Installation Instruction (1531-BML 351 048) and
- Installation Instruction (1531-BML 351 013).

To ensure proper function the batteries should be replaced by new ones every five years.

The replacement of the battery on the VMU-board is done easily:

1. be sure that the main supply is ON
2. then replace the battery package on the front of the VMU-board

The product No. for the battery on the VMU-board is RNV 991 942/001.

Revision: E © Ericsson Enterprise 2003