Lucent DDM-2000 OC-3 User And Service Manual page 731

TAP-118
: Trouble Clearing
Page 5 of 8
26.
NOTE:
The air flow sensor could get contaminated with dust in environments
where excessive dust is present and/or in situations where the fan filter
was not installed. The air flow sensor is located in the area where fan
pack #2 is located. When fan pack #2 is removed, it is still difficult to see
if the air flow sensor has accumulated dust. If dust is suspected and a
replacement fan shelf is not available, then personnel experienced in the
air flow sensor cleaning procedures may clean the sensor element.
27. Remove fan shelf front cover.
28.
NOTE:
Fan packs are numbered from left to right as viewed from the front of the
fan shelf. To remove fan pack, disconnect fan cable from fan pack.
Remove 2 screws holding fan in place. Slide out fan pack.
Remove fan pack #2. See Figure 2.
29. Locate air flow sensor (Figure 2) and direct a gentle blast of clean dry air
toward the center of the vertical sensor orifice.
30. Reinsert fan pack #2. Reinstall screws and connect fan cable.
31. Reinstall front cover and momentarily depress the ALARM RESET button.
32. Is FILTER REPLACE LED lighted on fan shelf?
If YES, then proceed to Step 15.
If NO, then STOP. YOU HAVE COMPLETED THIS PROCEDURE.
33. Is FAN FAULT 1, 2, 3, or 4 LED lighted on fan shelf?
If YES, then continue with Step 34.
If NO, then proceed to Step 35.
34.
NOTE:
Fan packs are numbered from left to right as viewed from the front of the
fan shelf. To replace fan pack, remove front cover and disconnect fan
cable from failed fan pack. Remove 2 screws holding fan in place. Slide
out old fan and install new one. Reinstall screws and connect fan cable.
Trouble is in fan pack associated with lighted LED. Replace ED-8C733-30, G6
fan pack.
Reference: DLP-548
DDM-2000 OC-3 M
Issue 2, February 2000
ULTIPLEXER
363-206-285