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

5c-8 Service Error Messages
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.
Modulation20 dB step failure
The 20 dB step attenuator has failed.
The A3 board has failed.
Replace the A3 board.
Commfailure:
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.
ROMchecksumfailure
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.
VolatileRAMread/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.