Nortel DMS-100 Series Maintenance Manual page 692

13-90 OPM routine maintenance procedures
Testing power converter voltages
HIE
(end)
Testing power converter voltages
At your current location
1
2
3
Test point voltage
+12 V
-12 V
+ 5 V
-5 V
4
5
297-8361-550 Standard 04.01 September 2000
Obtain a dc voltmeter.
Measure the voltage at the test points on the faceplates of all NT2X70 power
converters in the HIE frame.
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.
If test point voltages are
within acceptable range
not within acceptable range step 4
Replace the NT2X70 power converter as directed in Card Replacement
Procedures .
On returning to this procedure, go to step 5.
The procedure is complete.
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 through -4.9 V
Do
step 5