HP 8648 A/B/C/D - Changpuak.ch

613
Description
Cause
What To Do
614
Description
Cause
What To Do
615
Description
Cause
What To Do
616
Description
Cause
What to Do
617
Description
Cause
What To Do
Referenceout-of-lockat 1GHz
The A4 module indicates that the 1 GHz reference
is out-of-lock.
Either the A4 module has failed or a bad external
reference is connected.
Replace the A4 module.
400 Hz modulation source failed
The A3 board indicates that the 400 Hz modulation
source is not present.
Either the 200 kHz reference signal from the A4
module has failed, or the A3 has failed.
Check the 200 kHz reference output of the A4
module at the input to the A3 board.
1kHzmodulationsourcefailed
The A3 board indicates that the 1 kHz modulation
source is not present.
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.
Replace the A3 board.
AMmodulat ionpathfailure
The AM 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.
FMmodulationpathfailure
The FM 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.
Service Error Messages 5c-7