Maintenance Object Repair Procedures
555-233-123
10-368 Issue 4 May 2002
Figure 10-17. 631DA or 631DB AC Power Unit
Power Unit Replacement Procedures
If the power unit to be replaced is in a control carrier of a PPN system, refer to
‘‘Replacing power supplies and fans’’ in Chapter 5, ‘‘Routine Maintenance
Procedures’’ before replacing the power unit.
1. Set the power switch to OFF, and unplug the power cord.
2. Move the locking slide on the power unit to its leftmost position and unlatch
the locking lever.
3. Remove the power unit from the carrier.
STATUS
LOCKING
LEVER
LOCKING
SLIDE
POWER
CORD
OUTLET
LEDS
RED
AMBER
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