618
Description
Cause
What
To
Do
619
Description
Cause
What
To
Do
620
Description
Cause
What
To
Do
625
Description
Cause
What
To
Do
626
Description
Cause
What
To
Do
PM
modulation path failure
The PM path detector indicates
a
failure at the output
of the A3 board.
Either the signal output has failed, or the detector
has failed.
Replace the A3 board.
Modulation
20
dB step failure
The
20
dB step attenuator has failed.
The A3 board has failed.
Replace the
A3
board.
Comm
failure
:
A
serial communication failure has occurred with the
indicated assemblies.
Either the
A3
controller has failed or the indicated
assembly has failed.
If
one assembly has failed, check the indicated
assembly.
If
multiple failures have occurred, check
the controller
first.
In either case, both the controller
and the assembly should be checked.
ROM
checksum failure
The
A3
controller has detected
a
mismatch in reading
data from
ROM.
Either the controller has failed in reading from
ROM,
or the
ROM
data
has
failed.
Check the hardware connection between the mother
board and the
ROM
board.
Volatile
RAM
read/write failure
The controller detected
a
failure when comparing
data that was written to, and then read from volatile
RAM.
This is
a
hardware failure between points on the A3
board.
The A3 board failure should be verified and the board
replaced.
Service Error
Messages
5c-7
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