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only the receivers top cover must be removed for access. If boards Al or A9 are to be removed or
installed, both the receiver's bottom and top covers must be removed for access. The procedure for
removing either cover is as follows:
.
1. Position the Receiver horizontall¥ so that the cover to be removed is up.
2. Loosen (counterclockwise) the six
(6)
~
turnJasteners located on the Gover.
3. Carefully lift the cover by its edges and remove it from the Receiver.
Installation of either cover is as follows:
:. 1.
Position the cover on the Receiver so that the six
(6)
~
turn fasteners on the cover align
with their mounting holes on the Receiver, and so that the front edge of the cover is
inserted into the slot on the rear of the front panel.
2. Apply a small amount of hand pressure to the cover to engage the fastener with its
mount.
3.
Tighten (clockwise) the six
(6)
fasteners
~
turn.
5.7.3
Al Module Removal
1. Perform the Preliminary Procedure as directed in Paragraph 5.7.1.
2. Remove both the receiver top and bottom covers as directed in Paragraph 5.7.2.
3. Disconnect 5MB connector Al W2PI from J5 on the receiver frame.
4. Disconnect BNC connector AIWlJl from Jl (the RF IN jack) on the rear panel.
5. Stand the Receiver on its side.
6. Working from the bottom of the Receiver, loosen and remove the two screws and hard-
ware from the ends of the Al module.
CAUTION
Do not allow the Al module to drop when the screws are removed.
Failure to do so may cause damage to the Al module or to the
Receiver.
7. Carefully lift out the Al module from the top of the Receiver.
5.7.4
Al Module Installation
Installation is the reverse of removal with the following notes:
1. The end ,of the A 1 module marked "IN", when positioned correctly, is mounted on the
mount nearest S2 (EXT-INT REF switch).
2. When installing the mounting screw at the "IN" end, ensure that the ground lug on the
AIWIJl cable is placed inside the Al module between the Al cover and the threaded
mount, and that the mounting screw goes through the lug.
5-17
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