Nortel DMS-100 Series Maintenance Manual page 457

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 all NT2X70 power
converters in the SME frame.
3 The voltages must be within 2 percent of the nominal values printed on the
NT2X70 faceplate. Compare the voltages measured with the acceptable
voltage ranges given below.
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 directed in Card Replacement
Procedures .
On returning to this procedure, go to step 5.
5 The procedure is complete
Routine maintenance procedures 12-19
Testing power converter voltages Testing power converter voltages
DMS-100 Family SMS Maintenance Manual XPM10 and up
SMS
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
SMS
(continued) (end)