Field Service Procedure – Replacement Pol Pot Kit, USAT
Page
4
of
7
Document No
135929 Rev A
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Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
5.
The
rotation
of
the
pol
pot
consists
of
3
complete
revolutions.
When
installing
the
pot
it’s
good
practice
to
set
it
in
the
center
of
its
range
(1.5
turns
from
one
of
its
end
stops)
while
aligning
the
feed
in
the
centre
of
its
range
(so
that
the
LNB
is
horizontal
with
the
coax
cable
pointing
towards
the
left).
This
means
the
calibration
of
the
pot
will
only
require
minimal
adjustment
and
prevent
damage
to
the
assembly
by
allowing
it
to
drive
into
one
of
its
mechanical
end
stops
(which
is
possible
if
there
is
a
large
amount
of
error
in
the
pot
alignment).
6.
Install
the
replacement
pot
assembly
onto
the
feed
by
looping
the
pulley
through
the
belt.
Then
install
the
flat
washer,
followed
by
the
star
washer
onto
the
retaining
screw
and
apply
Loctite
242
to
the
thread.
Pull
down
on
the
assembly
to
tension
the
belt
and
tighten
the
retaining
screw.
*Note:
Additional
mounting
hardware
is
provided
in
the
kit
should
it
be
required.
7.
Verify
the
tension
of
the
belt
by
pressing
on
it
at
the
central
position
between
the
pol
pot
pulley
and
the
main
drive
sprocket.
There
should
be
a
little
give,
but
the
belt
should
be
tight
enough
that
the
axis
will
drive
correctly,
without
skipping
on
the
teeth
of
the
pulley.
If
the
belt
is
too
tight/loose
repeat
the
previous
step
until
the
belt
tension
is
correct.
8.
Install
the
pol
pots
harness
connection
into
its
mounting
point
and
connect
the
reflector
harness
to
the
pol
pot
connector.
9.
Refer
to
the
following
calibration
procedure
to
align
the
potentiometer.
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