Field Service Procedure – Replacement PCU Kit, Coastal
Page
5
of
9
Document No
135553 Rev A
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consent of Sea Tel, Inc.
6.8.
Pol
Pot
/
Motor
Move
Test.
This
test
moves
the
feed
assembly
at
various
speeds
in
Polarization
and
checks
the
results
using
the
POL
potentiometer.
“Test
POL
Assy”
will
be
displayed
as
the
test
runs.
An
Error
code
8.01
‐
8.07
will
be
displayed
if
one
of
these
tests
fails.
A
failure
indicates
a
failed
motor,
belt
or
potentiometer.
This
could
be
due
to:
1.
Mechanical
binding
of
the
polarization
assembly
‐
With
the
antenna
powered
down,
visually
inspect
the
polarization
assembly
(including
LNB
and
cables)
for
drag
against
the
pedestal
or
dish.
Rotate
the
polarization
assembly
by
hand
to
feel
for
any
binding
in
rotation.
Re
‐
route
cables
to
remove
fouling
with
the
pedestal.
If
binding
is
felt,
remove
motor
belt
and
re
‐
check
binding.
If
the
polarization
assembly
is
still
binding
(indicating
bearing
failure)
it
must
be
replaced.
If
this
check
found
a
problem,
and
you
have
corrected
it,
re
‐
run
the
BIT
tests.
2.
Pol
drive
belt
or
pol
pot
drive
belt
dragging
or
slipping
‐
Inspect
drive
belts
for
chaffing
or
wear
(leaves
black
dust).
Inspect
the
drive
belts
proper
tension
(belts
should
be
semi
‐
taut
when
pinched
in
on
both
sides
of
the
motor
drive
sprocket
or
pot
drive
sprocket.
The
belts
should
not
flex
more
than
1/16th
inch
on
both
sides
when
pinched).
Re
‐
align
and
tension
the
motor
and
pot
for
correct
belt
path
and
tension.
If
this
check
found
a
problem,
and
you
have
corrected
it,
re
‐
run
the
BIT
tests.
3.
Rotate
the
polarization
assembly
to
center
of
its
mechanical
range
(LNB
vertical)
and
observe
while
BIT
test
runs.
If
the
pol
motor
does
not
drive
during
the
test,
replace
the
pol
motor
and
re
‐
run
the
BIT
tests.
If
the
polang
potentiometer
(pol
pot)
is
mounted
out
of
position
or
has
failed,
rotate
the
polarization
assembly
to
the
center
of
its
mechanical
range.
Loosen
pot
mounting
bracket
to
de
‐
couple
the
belt
and
rotate
the
pot
sprocket.
If
the
sprocket
is
loose
on
the
shaft
of
the
pot,
tighten
the
set
screws.
If
the
pot
does
not
rotate,
replace
it.
Check
continuity
of
the
pot
from
the
wiper
and
both
the
clockwise
and
counter
‐
clockwise
contacts.
Clockwise
to
counter
‐
clockwise
ends
and
vice
versa,
a
steady
resistance
from
0
–
5
or
5
–
0
ohms
should
be
measured
(depending
on
the
direction
of
rotation)
from
wiper
to
clockwise,
or
counter
‐
clockwise,
to
verify
proper
operation.
The
pot
is
a
three
turn
potentiometer,
rotate
the
sprocket
to
find
one
end
stop
and
then
rotate
it
exactly
1
½
turns
away
from
that
stop
to
the
center
of
rotation.
Hold
the
sprocket
in
place
while
re
‐
coupling
the
belt,
tension
the
belt
as
you
tighten
the
pot
mounting
bracket.
If
this
check
found
a
problem,
and
you
have
corrected
it,
rerun
the
BIT
tests.
Check
the
harness
for
good
continuity
from
point
‐
to
‐
point
and
that
there
are
no
shorts
from
wire
‐
to
‐
wire
or
from
wire
‐
to
‐
ground
that
are
not
supposed
to
be
there
as
per
the
above
diagram.
Repair
any
harness
problems
found
and
rerun
the
BIT
tests.
If
there
are
no
problems
with
any
of
the
steps
above,
replace
the
PCU
and
rerun
the
BIT
tests.
Summary of Contents for Coastal
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