Nortel DMS-100 Series Maintenance Manual page 623

Testing power converter voltages
At your Current Location
1 Obtain a dc voltmeter.
2 Measure the voltage at the test points on the faceplates of both NT2X70 power
converters in the HIE shelf.
3 The voltages must be within 2% of the nominal values printed on the NT2X70
faceplate. Compare the voltages measured with the following acceptable
voltage ranges:
Test point voltage
+12 V
–12 V
+ 5 V
– 5 V
If test point voltages are
within acceptable range
not within acceptable range
4 Replace the NT2X70 power converter as Card Replacement Procedures
directs.
When you return to this procedure, go to step 5.
5 This procedure is complete.
DMS-100 Family RLCM Maintenance Manual XPM12 and up
Routine maintenance procedures 13-7
Testing power converter voltages Testing power converter voltages
Acceptable range
+11.76 V to +12.24 V
–12.24 V to –11.76 V
+4.9 V to +5.1 V
–5.1 V to –4.9 V
Do
step 5
step 4
HIE HIE
(continued) (end)