
Procedure, Field Replacement, Level Cage Kit, Side Exit
Page
4
of
8
Document No
135265 Rev B
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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.
10.
Diagnostics:
Any
incorrect
readings
from
the
above
tests
would
relate
to
an
error
in
the
antennas
control
loop
causing
the
system
to
not
stabilize
correctly.
The
most
likely
cause
of
this
is
a
defective
sensor
in
the
level
cage.
The
next
step
would
be
to
replace
and
re
‐
calibrate
the
level
cage.
Now
repeat
the
failed
test
to
verify
that
the
system
is
now
functioning
correctly.
Should
the
problem
remain,
another
possible
cause
may
be
a
fault
with
the
reference
harness
between
the
level
cage
and
PCU.
The
PCU
itself
should
not
be
ruled
out
as
faulty
either.
Even
so,
the
level
cage
is
the
most
likely
component
to
be
causing
this
issue,
therefore
replacing
it
is
the
first
step
when
troubleshooting.
Once
the
problem
has
been
rectified,
it
is
good
practice
to
refit
the
original
level
cage
and
see
if
the
fault
returns.
It
is
possible
that
corrosion
on
the
pins
of
the
reference
harness
and/or
connectors
of
the
PCU/level
cage
caused
the
initial
fault.
By
connecting
the
replacement
level
cage,
it
is
likely
that
any
pin
corrosion
may
have
rubbed
off,
creating
a
cleaner
electrical
contact.
You
may
have
been
under
the
impression
that
replacing
the
level
cage
rectified
the
fault
when
in
actual
fact;
the
issue
was
a
poor
electrical
contact
causing
varying
resistance.
11.
Further
Information:
Should
the
system
fail
to
target
the
correct
elevation
(physically
pointing
at
a
different
position
to
the
reading
on
the
DAC),
or
have
issues
driving
past
a
certain
elevation
position
then
the
most
likely
cause
is
a
defective
level
cage
motor.
If
the
system
is
displaying
a
pedestal
error
(error
8),
there
is
a
drive
issue
with
the
antenna
and
attention
will
need
to
be
paid
to
the
motor
and
motor
driver
(servo
amp)
for
the
relevant
axis.
There
is
no
error
code
that
directly
tells
you
if
the
level
cage
or
level
cage
stepper
motor
has
failed,
however,
a
pointing
or
stabilization
issue
is
a
good
indication.
Another
potential
issue
which
could
cause
the
antenna
to
lose
the
satellite
is
if
the
vessels
gyro
compass
is
drifting.
This
accumulating
error
is
then
fed
into
the
control
loop.
This
can
be
verified
by
running
a
DacRemP
log
file
at
sea
to
monitor
the
pedestals
readings
when
the
AGC
drops,
or
by
putting
the
system
into
satellite
reference
mode
to
uncouple
the
gyro
feed
from
the
azimuth
stabilization
loop.
Summary of Contents for Side Exit
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