363-205-401
Power Up: DLP-520
Issue 7, March 1997
Page 3 of 4
15. Replace RCU and repeat from Step 7.
16. Get DMM and condition it to measure DC volts.
17. Connect DMM test leads to
−
48V jack and GND jack on RCU.
18. Does meter indicate
−
43 to
−
56 volts?
If YES, then proceed to Step 20.
If NO, then continue with Step 19.
19. Replace RCU and repeat from Step 7.
20. On RCU at +20HZA jack and GND jack [Figure 1], measure DC positive ring-
ing.
Requirement: Meter indicates between 50 and 60 volts
21. Condition DMM to measure AC volts. Measure AC positive ringing at same
jacks (+20HZA and GND).
Requirement: Meter indicates between 90 and 110 volts.
22. Did meter indicate as required in Step 20 and Step 21?
If YES, then proceed to Step 24.
If NO, then continue with Step 23.
23. Replace RCU and repeat from Step 7.
24. Have both +20HZA and +20HZB jacks been tested?
If YES, then STOP. YOU HAVE COMPLETED THIS PROCEDURE
If NO, then continue with Step 25.
25. Condition DMM to measure DC volts and repeat from Step 20 for +20HZB
jack.
