A P P E N D I C E S
Series 8000™ O&M Manual
85
5.3.30
"No power at drive cabinet"
This fault condition is inferred when all drive cabinet faults occur sim-
ultaneously. May put system in standby.
5.3.31
"Halted at PMCU"
The system was halted via a Portable Maintenance Control Unit.
Touch-panel computer (TPC) faults
5.3.32
"Low tracking signal level"
The tracking-signal level is too low to perform steptrack operations.
Common causes:
•
Not beginning tracking on the target signal main lobe.
•
Incorrect tracking receiver frequency.
•
Incorrect tracking receiver source selected.
5.3.33
"Unstable tracking signal level"
The tracking signal is varying too rapidly to steptrack.
5.3.34
"IOC communication failure"
The link between the touch-panel computer
’s I/O
controller and the
drive cabinet has been severed. The system will de-assert the drive-
enable line.
5.3.35
"IOC2 communication failure"
See preceding, but applied to the secondary I/O controller board.