BusinessPhone Communication Platform 4.0
Fault Tracing ASB 150 02 > Procedures

## Check on power supply

Check the secondary voltage of the transformer(~36VAC), generally power supply (48VDC) and battery charger regarding connection to mains and functioning fuses. Check (if installed) the battery condition of the power back-up. Replace (if any) faulty units. The voltages (see drawing below) can be verified on the backplane. As there is always the risk of short circuits these measurements should be done when all boards have been removed.

Revision: F © Ericsson Enterprise 2003