5c-7
Service Error Messages
616 AM modulation path failure
Description The AM path detector indicates a failure at the output of the A3 board.
Cause Either the signal output has failed, or the detector has failed.
What To Do Replace the A3 board.
617 FM modulation path failure
Description The FM path detector indicates a failure at the output of the A3 board.
Cause Either the signal output has failed, or the detector has failed.
What To Do Replace the A3 board.
618 PM modulation path failure
Description The PM path detector indicates a failure at the output of the A3 board.
Cause Either the signal output has failed, or the detector has failed.
What To Do Replace the A3 board.
619 modulation 20 dB step failure
Description The 20 dB step attenuator has failed.
Cause The A3 board has failed.
What To Do Replace the A3 board.
620 Comm failure:
Description A serial communication failure has occurred with the indicated
assemblies.
Cause Either the A3 controller has failed or the indicated assembly has failed.
What To Do 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.
625 ROM checksum failure
Description The A3 controller has detected a mismatch in reading data from ROM.
Cause Either the controller has failed in reading from ROM, or the ROM data has
failed.
What To Do Check the hardware connection between the motherboard and the ROM
board.
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