Lucent Technologies SLC 5 Series - Page 127

363-205-401 Power Up: DLP-509
Issue 7, March 1997 Page 3 of 4
10. Condition digital multimeter (DMM) to measure DC volts.
11. On
PRU
, connect DMM test leads to −
48
jack and
FR GND
jack.
12. Does DMM indicate between −42 and −56 volts?
If
YES,
then proceed to Step
14.
If
NO,
then continue with Step
13.
13. Check wiring on power shelf between
336A RECTIFIER
and
PRU
using
SD-7C119-01. Repeat procedure from Step
11
after locating and correcting
trouble.
14. On
PRU
, connect DMM test leads to −
20HZ
jack and
FR GND
jack.
Response: DMM indicates between −50 and −60 volts.
15. 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.
16. Is AC/DC ringing voltages present at −
20HZ
jack on the
PRU
?
If
YES,
then proceed to Step
18.
If
NO,
then continue with Step
17.
17. Check wiring on power shelf between
3C RINGING GENERATOR
and
PRU
using SD-7C119-01. Repeat procedure from Step
14
after locating and cor-
recting trouble.
18. Condition DMM to measure DC volts.
19. On
PRU
, connect DMM test leads to
+20HZ
jack and
FR GND
jack.
Response: DMM indicates between 50 and 60 volts.
20. 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.
21. Is AC/DC ringing voltages present at
+20HZ
jack on the
PRU
?
If
YES,
then
STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If
NO,
then continue with Step
22.
22. Replace
PRU
and repeat procedure from Step
2
.