Manual 0-2470 67 CUSTOMER/OPERATOR SERVICE
The fan assembly consists of a rotary fan, an attached spacer
plate, and a foam seal. To replace the fan assembly:
1. Remove the LDD board to expose the top panel.
2. Remove the two nuts which hold the input connection block
from the top panel. Move the input block and its mounting
panel up out of the way.
3. Remove the four nuts which hold the top panel to the front
and rear panel and lift the top panel to allow the fan assembly
to be removed by lifting it out.
4. Remove the old fan by removing the two wires from the fan
terminals and removing the four mounting screws from the
rear panel. A small socket wrench or needlenose pliers may
be necessary to hold the nuts while removing the screws.
5. Replace with a new fan assembly. Slide the assembly in
gently so that the foam seal doesn’t catch and seals tightly
against the heatsinks.
6. Place the fan guard on the outside of the unit and reinstall the
four fan mounting screws and nuts.
7. Connect the two wires back onto the fan terminals (polarity
doesn’t matter).
8. Put the top panel onto its mounting studs and make sure the
studs on the bottom of the panel enter the holes in the top of
the heatsinks. Some slight wiggling of the heatsinks may help
this alignment. Tighten the panel mounting nuts to just short
of fully tight and measure the distance between the middle
and top panels. Move the panel slightly until this distance is
4 1/16 inches from the top of the middle panel to the top of
the top panel. Tighten the mounting screws the rest of the
way. Check this measurement again, because if it is off, you
will have difficulty reassembling the enclosure.
9. Install the LDD board and remount the input block to the top
panel.
Fan Assembly
5.08 SERVICE PROCEDURES (continued)
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