Power Up: DLP-521
363-205-401
Page 2 of 2
Issue 7, March 1997
8.
Is AC/DC ringing present on RING GEN1?
If NO, then continue with Step 9.
If YES, then proceed to Step 10.
9.
Check wiring on power shelf connecting to RING GEN1 using SD-7C163-01.
Repeat procedure from Step 3 after locating and correcting trouble.
10. Condition DMM to measure DC volts.
11. On RING GEN1, connect DMM test leads to
−
48V jack and GND jack.
12. Does DMM indicate between
−
42 and
−
56 volts?
If NO, then continue with Step 13.
If YES, then proceed to Step 14.
13. Replace RING GEN1 and repeat the procedure from Step 3. If replacement
RING GEN1
−
48V voltage requirements are not met, proceed to Step 9.
14. Did any
−
20HZ fuses blow on RCU?
If YES, then continue with Step 15.
If NO, then proceed to Step 16.
15. Replace RCU
−
20HZ fuse. If replacement fuse blows, replace RCU
Reference:
DLP-520
16. Have both 3H1 RINGING GENERATORs been tested?
If YES, then proceed to Step 19.
If NO, then continue with Step 17.
17. Unseat RING GEN1.
18. Insert second 3H1 RINGING GENERATOR into RING GEN2 slot in power
shelf and repeat from Step 3.
19. Reseat RING GEN1.
STOP. YOU HAVE COMPLETED THIS PROCEDURE.
