DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-367CABINET (Cabinet Sensors)
9
1
(Cont’d.)
FAIL
(Cont’d.)
NONVARIABLE-SPEEDFAN ASSEMBLIES (older or upgraded
cabinets): The AHD1 circuit pack has reported an air flow prob lem.
The temperature difference between the air intake and the air exhaust
is at least 150C (590F)) and the absolute temperature at the top of the
cabinet is at least 500C (1220F). The fans should be running at high
speed. If none of the fans are running then:
1. Look for an resolve all alarms against CARR-POW.
2. Verify that 48 VDC is available to the fan wiring harness connector
between pin pairs 2/3, 8/9, and 10/11. The tolerable range for this
measurement is -42.5 V to -52.5 V.
If 48 VDC is present and the fans are not running, replace the
AHD1 circuit pack.
3. If the fans still do not run, escalate the problem.
4. If 48 VDC is not present, replace the CFY1B current limiter card.
If the fans still do not run, escalate the problem.
If some fans are running and some not, replace the defective fans.
5. If all fans can then be started, wait 5 minutes and rerun the test. If
the test fails again, proceed to the next step.
6. If all fans are running but not at high speed, measure the cabinet
temperature at the air intake and the air exhaust at the top of the
cabinet.
a. If the 150C/500C criteria is met, there is a problem with the
AHD1 circuit pack or the fans. Replace the AHD1 circuit pac k
and/or fans. If the fans run at high speed, wait 5 minutes for the
cabinet to cool, then retest. If the test fails, escalate the
problem.
b. If the 150C/500C criteria is not met, the SYSAM (in a PPN) or
EPN Maintenance circuit pack is incorrectly reporting this
cond ition . Resolv e all SYSA M or MAI NT error s and retest . If th e
test fails, escalate the problem.
Table 9-158. TEST #122 Cabinet Temperature Query T es t — Continued
Error
Code Test
Result Description/ Recommendation
Continued on next page