Orban OPTIMOD-TV 8182A Operating Manual page 86

Open the rear panel (procedure 13). With the transistors removed, it is possible
to release the circuit card from its plastic post mounts by squeezing the tangs in
each of the four corners to permit pulling the card off the posts.
**** This procedure is directly reversible with cautions:
-- See the discussion above regarding heat- conduction insulators.
-- The power transistor sockets must be correctly aligned with the rear- panel
holes to prevent short circuits.
The screws mounting the transistors should be tightened evenly. For best
thermal contact, tighten each screw a small amount, alternating between
screws. Tighten securely, but not enough to damage the threads in the
sockets.
-- Note that there must be a split lockwasher under each screwhead to
accomodate thermal cycling.
The Thermalloy ( TM) plastic cover does not attach in a conventional or
readily obvious way. It rides on the circumference of the special split
lockwasher and does not ( and should not) become captured under the head of
the screw. Consequently, the cover may be slightly loose even after screws
are tightened securely. This is normal, and should not ( and cannot) be
corrected.
-- Be sure to reinstall the press- fit plugs that cover the screwheads.
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