Avaya Definity SI Maintenance Manual page 121

Troubleshooting power units
1. Remove the four screws on the top of the cabinet.
2. Remove the four screws from the fan panel at the rear of the unit.
3. Remove the fan panel.
4. If the unit is attached to the wall, disconnect the entire fan panel.
5. A cable assembly extends from the power supply and plugs into the
backplane with a Burndy connector. Squeeze the sides of the connector to
release the latch. Then pull the connector off of the backplane. See
5-4.
Figure 5-4. Power supply sub-assembly (inside view)
6. Remove the power supply from the unit. Once the power supply is
removed, disconnect the AC power cord.
7. Reconnect the AC power cord, insert the new power supply, reconnect the
Burndy connector and the cord, reinsert (if removed) the reconnected fan
panel, screw the fan panel back onto the unit, and reinsert the screws on
the top of the unit.
555-233-123
P/O
(Plug to
Power Supply)
To Backplane
Screw
Screw
Circuit
Breaker
Wire
Assembly P/O
(Blue)
(Green)
P/O
(Brown)
Wire
Assembly
(Blue)
Wire
Assembly
(Brown)
Circuit Module
(Green-Yellow
Wire Attaches to
Ground Block Screw)
P/O, PI Cable,
TY Wrap
Issue 4 May 2002
Figure
5-17