Field Service Procedure – Replacement PCU Kit, ST88, ST94 & ST144
Page
12
of
22
Document No
137738 Rev A
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18.
Failure
Table:
Diagnostics
from
the
above
table,
section:
17.1.
18.1.
None.
No
communication
failures
between
ADE
and
BDE
modems.
18.2.
Receive
IF
Path.
The
following
points
of
failures
assumes
LED
illumination
on
both
modems.
1.
Modem
Configuration.
Verify
BDE
modem
and
ADE
modem
are
properly
configured
(jumper
block
settings).
2.
Coax
Cable
failure
Verify
continuity
on
the
below
coaxes,
repair
or
replace
as
required.
1.
BDE
Modem
connector
bracket
(Base
Rack
Panel
Assembly)
2.
(CFE)
BDE
to
ADE
Rx
IF
(Base
Rack
Panel
to
radome
Connector
Bracket)
3.
Rx
N
to
SMA
Adapter
(Located
on
connector
bracket
at
radome
base)
4.
SMA
to
SMA
(From
connector
bracket
to
bottom
the
bottom
side
of
the
rotary
joint)
5.
SMA
to
SMA
(From
top
side
rotary
joint
to
PCU/ADE
Modem
3.
Rotary
Joint
(Receive
channel).
Verify
continuity
on
the
receive
channel
for
its
entire
360
degree
range
of
motion.
Replace
rotary
joint
if
any
sector
of
it
has
failed.
18.3.
BDE/ADE
No
Response.
The
Following
points
of
failures
assumes
LED
illumination
on
both
modems.
1.
Modem
Configuration
Verify
BDE
modem
and
ADE
modem
are
properly
configured
(jumper
block
settings).
2.
ACU
to
BDE
modem
interface
cable
failure
Verify
harness
continuity.
Repair
or
replace
as
required
3.
ACU
Antenna
Port
Failure
Install
an
RS232
Loopback
connector**
on
Antenna
Port
of
the
ACU.
Enter
an
“n0999”
Remote
Command
and
verify
that
it
echoes
back
on
the
bottom
line
of
the
display.
1.
If
loop
back
works,
BDE
Modem
failure
or
ACU
to
BDE
Interface
cable
failure.
2.
If
loop
back
does
not
work,
ACU
failure.
Summary of Contents for ST144
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