User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-278CARR-POW (Carrier Port Power Unit) for AC-Powered Systems
10
FAIL There is a problem with one or both power units on the
tested carrier.
1. For each power unit that has all sttus LEDs OFF,
check the AC input to the power unit at the power
unit outlet (see Figure 10-12 and Figure 10-13). If
there is no AC, then check the appropriate fuses
(see Figure 10-14) for the affected power unit. If the
fuses are blown out, replace the fuses (see ). If the
fuses blow out again or AC does not show up at the
power unit outlet, then there is probably a power
wiring problem in the cabinet. Follow normal
escalation procedures.
2. At this point AC should be present at the power unit
outlet. If the carrier being tested is the 1A or 2A
carrier or the 1B carrier in a High or Critical
Reliability system, refer to "Troubleshooting Control
Carrier Power Units" in Chapter 5, "Routine
Maintenance Procedures". Otherwise, use the
recycle carrier PC command (where PC is the
appropriate port network and carrier) in an attempt
to bring back the power units for this carrier.
If the test passes, the trouble is cleared. If the test
does not pass, one power unit, or both, in the tested
carrier is defective.
If only one power unit is defective, the status LEDs
on the healthy power unit light green for a moment.
When the recycle test determines that both power
units are defective, the software turns off power to
both the good and defective power units. This
causes the status LED(s) on the good power unit to
light red.
3. Unplug both power units, and wait about one minute
to allow the power units to cool down. Plug in the
power units. If either power unit is operating properly
(that is, the status LEDs show green), then replace
the defective power unit(s). See "Power Unit
Replacement Procedures" in this section.
Table 10-83. TEST #127 Power Unit Query Test — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page