Avaya Definity SI, Maintenance Manual, Page: 1176 / 2968

Maintenance Object Repair Procedures
555-233-123 10-390 Issue 4 May 2002
FAIL There is a problem with one or both port carrier power units on
the tested carrier.
1. For each port carrier power unit that has all status LEDs
OFF, check the DC input to the port carrier power unit at
the port carrier power unit outlet (see Figures 11-19
through 11-22). If there is no DC, then check the
appropriate circuit breakers for the affected port carrier
power unit. If the circuit breaker has tripped (that is, it is in
the down position), reset the circuit breaker. If the circuit
breaker trips again or DC is not present at the port carrier
power unit outlet, there is probably a power wiring
problem in the cabinet. Follow normal escalation
procedures.
2. At this point, DC should be present at the port carrier
power supply outlet. If the carrier being tested is the 1A or
2A carrier, or the 1B carrier in a High or Critical Reliability
system, see “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 port carrier power unit, or both, in the tested
carrier is defective.
If only one port carrier power unit is defective, the status LEDs
on the healthy port carrier power unit light green for a moment.
When the recycle test determines that both port carrier power
units are defective, the software turns off power to both the
good and defective port carrier power units. This causes the
status LED(s) on the good port carrier power unit to light red.
Table 10-144. TEST #127 Power Unit Query Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page