Lucent Technologies SLC 5 Series - Page 158

363-205-401 Power Up: DLP-518
Issue 7, March 1997 Page 3 of 4
15. Check wiring on power shelf between
336A RECTIFIER
and
PRU
using
SD-7C119-01. Repeat procedure from Step
13
after locating and correcting
trouble.
16. On
PRU
, connect DMM test leads to −
20HZ
jack and
FR GND
jack.
Response: DMM indicates between −50 and −60 volts.
17. Leave DMM test leads connected to −
20HZ
and
FR GND
jacks and condition
DMM to measure AC volts.
Response: DMM indicates between 90 and 110 volts.
18. Is AC/DC ringing voltages present at −
20HZ
jack on the
PRU
?
If
YES,
then proceed to Step
20.
If
NO,
then continue with Step
19.
19. Check wiring on power shelf between
3C( ) RINGING GENERATOR
and
PRU
using SD-7C119-01. Repeat procedure from Step
16
after locating and cor-
recting trouble.
20. Condition DMM to measure DC volts.
21. On
PRU
, connect DMM test leads to
+20HZ
jack and
FR GND
jack.
Response: DMM indicates between 50 and 60 volts.
22. Leave DMM test leads connected to
+20HZ
and
FR GND
jacks and condition
DMM to measure AC volts.
Response: DMM indicates between 90 and 110 volts.
23. Is AC/DC ringing voltages present at
+20HZ
jack on the
PRU
?
If
YES,
then proceed to Step
25
.
If
NO,
then continue with Step
24.
24. Replace
PRU
and repeat procedure from Step
2
.
25. Is another
PRU
to be installed at this time?
If
YES,
then proceed to Step
1
.
If
NO,
then
STOP. YOU HAVE COMPLETED THIS PROCEDURE.