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****
This procedure is directly reversible with cautions:
When
replacing
a cover,
align
it
as
closely
as
possible
with
the
corresponding holes, and start all screws. After all screws have been started,
tighten all screws to normal tightness, " inland" screws first.
b)
Access
To
Area Behind Rear
Panel: If
the
covers
are
still
in
place,
they
needn't be removed.
Remove
eight
screws
holding
the
top
cover
to
the
flange
of
the
rear
panel.
Remove the corresponding eight screws from the bottom cover. The rear panel will
remain solidly in place.
Set the chassis, bottom cover down, on a pad on a table. Allow 6" ( 15cm) between
the
rear
panel
of
the
chassis
and
the
table
edge.
Unplug
the
power
cord.
Now remove three groups of three screws which are circled in black on the rear
panel.
VERY carefully and slowly, pull the rear panel about
3/4" ( 2cm) toward you, and
tilt
the top edge down until the rear panel is horizontal and resting on the table.
CAUTION
Watch
for
snags
in
the
internal
wiring,
and
for
any
stress
on
the
ceramic
feedthrough
capacitors
on
the
divider
wall
or
RF
filter
box.
These capacitors are very fragile and difficult to replace.
****
This procedure is directly reversible with cautions:
When
positioning
the
rear
panel
over
the
corresponding
holes,
make
sure
that
no wires
are pinched under
the
flanges.
Start,
but
do not
tighten
all
nine screws. Observe the areas where the flanges on the rear panel meet the
flanges on the side panels. Adjust the rear panel so that the flanges line up
in order
to provide a flat
mounting surface
for the cover when
tightened.
c)
Access To
Input Filter Car& First
open
the
rear
panel ( procedure
b above).
Remove
the
four
screws
holding
the
RF
filter
box
to
the
rear
panel.
VERY
carefully
and
slowly,
tilt
the
metal
box
back
to
vertical,
taking
care
to
avoid
snagging
the
internal
wiring
and
stressing
the
ceramic
feedthrough
capacitors.
This will reveal the internal circuit card, which is attached to the rear panel by
four # 4-40 screws. While this card can be removed for component replacement, it
is
easier ( though less workmanly) to clip out
the defective
component
from
the
topside
and
to
install
its
replacement
by
tack- soldering
to
the
old
leads.
****
This procedure is directly reversible with cautions:
--
If components have been replaced, make sure that reassembly will not result
in crushing of the component against the rear panel.
Tilt
the
box
back
to
horizontal (so
it
rests
against
the
rear
panel)
very
slowly
and
carefully.
Watch
for
wire
snags
and
dress wires
appropriately.
Make sure that no wires are crushed under the flange.
d) Access To Unregulated Power Supply Chamber: If the covers are not
already
removed, remove the five cover screws which attach the top cover to the flange
of
the
side panel. Remove the corresponding five screws from the bottom cover.
C-2
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