CARR-POW (Carrier Port Power Unit) for AC-Powered
Systems
Issue 4 May 2002
10-375 555-233-123
FAIL There is a problem with one or both power units on the tested
carrier.
1. For each power unit that has all status 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 10-142. TEST #127 Power Unit Query Test — Continued
Error
Code
Te s t
Result Description/Recommendation
Continued on next page
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