
Field Service Procedure – Replacement Pol Pot Kit, 4012
Page
6
of
16
Document No
136829 Rev A
Copyright © Sea Tel, Inc 2012 - The information contained in this document is proprietary to Sea
Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
6.
Verify
the
Resistance
of
the
Pol
Pot:
The
polang
potentiometer
(pol
pot)
consists
of
an
internal
slider
as
well
as
a
clockwise
and
counter
‐
clockwise
contact.
To
verify
the
resistance
of
the
pot
a
multi
meter
can
be
used
to
measure
between
the
slider
and
one
of
the
wipers
whilst
rotating
the
shaft
through
its
range
and
verifying
the
0
–
5
ohms
is
outputted
correctly.
Remove
the
pot
from
the
RF
cage
as
per
the
replacement
procedure
of
this
document
and
measure
the
resistance.
Looking
down
onto
the
shaft
of
the
pot
rotate
it
clockwise
until
it
reaches
its
end
stop.
Now
measure
the
resistance
between
the
slider
and
the
CCW
contact
(grey
cable,
pin
2
on
the
IDC
connector
and
the
red
cable
pin
3
on
the
IDC
connector).
The
feedback
should
be
approximately
5k
ohms.
Now
slowly
rotate
the
shaft
of
the
pot
counter
clockwise,
the
reading
should
count
down
sequentially.
After
one
and
a
half
turns
the
pot
will
be
in
the
center
of
its
range
giving
a
resistance
of
approximately
2.5k
ohms.
Continue
to
rotate
the
pot
until
the
counter
clockwise
end
stop
(it
will
now
have
turned
through
all
3
rotations
of
its
range),
the
resistance
should
be
approximately
0
ohms.
Leaving
the
pot
at
its
counter
clockwise
end
stop
measure
between
the
clockwise
contact
and
the
slider
(grey
cable,
pin
2
on
the
IDC
connector
and
the
brown
cable
pin
1
on
the
IDC
connector)
the
resistance
should
be
reversed
from
the
previous
rotation,
reading
5
ohms.
Rotating
the
shaft
of
the
pot
clockwise
should
reduce
the
resistance
through
its
range
to
0
ohms.
Any
error
with
the
pot
not
giving
the
correct
resistance
is
an
indication
the
pot
is
defective
and
needs
replacing.
Summary of Contents for 4012
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