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.
