5c-6
Service Error Messages
611 200 kHz reference missing at synth
Description The A5 module indicates that the 200 kHz reference signal from the A4
module is not being detected.
Cause Either the A4 module has failed to output the 200 kHz reference signal, or
the A5 module is failing to detect the signal.
What To Do Check the 200 kHz reference output of the A4 module at the input to the
A5 module.
612 Reference out-of-lock at 10 MHz
Description The A4 module indicates that the 10 MHz reference VCO is out-of-lock.
Cause Either the A4 module has failed or a bad external reference is connected.
What To Do Disconnect any external reference and power up the instrument again or
replace the A4 module if the error is still present with no external
reference.
613 Reference out-of-lock at 1 GHz
Description The A4 module indicates that the 1 GHz reference is out-of-lock.
Cause Either the A4 module has failed or a bad external reference is connected.
What To Do Replace the A4 module.
614 400 Hz modulation source failed
Description The A3 board indicates that the 400 Hz modulation source is not present.
Cause Either the 200 kHz reference signal from the A4 module has failed, or the
A3 has failed.
What To Do Check the 200 kHz reference output of the A4 module at the input to the
A3 board.
615 1 kHz modulation source failed
Description The A3 board indicates that the 1 kHz modulation source is not present.
Cause Either the 200 kHz reference signal from the A4 modulation source has
failed, or the A3 board has failed. However, if the 400 Hz modulation
source has already been tested, the failure is most likely the A3 board.
What To Do Replace the A3 board.
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