Power Up: DLP-508 363-205-401
Page 2 of 4 Issue 7, March 1997
7. Does DMM indicate between −50 and −60 volts?
If
YES,
then proceed to Step
23.
If
NO,
then continue with Step
8.
8. Is
FAIL
indicator on
RINGING GENERATOR
off?
If
YES,
then proceed to Step
10.
If
NO,
then continue with Step
9.
9. Replace
RINGING GENERATOR
and repeat from Step
3.
10. Condition DMM to measure DC volts.
11. On
RINGING GENERATOR
, connect DMM test leads to −
48V
jack and
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 connecting to
RINGING GENERATOR
. Repeat
procedure from Step
3
after locating and correcting trouble.
14. Condition DMM to measure AC volts.
15. On
LDU
, connect DMM test leads to −
20 HZ
jack and
GND
jack.
16. Does DMM indicate between 90 and 110 volts?
If
YES,
then continue with Step
17.
If
NO,
then proceed to Step
20.
17. Condition DMM to measure DC volts.
18. On
LDU
, connect DMM test leads to −
20 HZ
jack and
GND
jack.
19. Does DMM indicate between −50 and −60 volts?
If
YES,
then proceed to Step
21.
If
NO,
then continue with Step
20.
20. Replace
RINGING GENERATOR
and repeat from Step
3.
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