Harris Platinum Z2 CD, Manual

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888-2406-002 6-19
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.9.23.2 System ISO Overload (Fault)
If the System ISO APC Foldback routine fails to reduce the temperature of the
ISO_Bz load and the temperature reaches 145°C, the Master Controller will mute
the IPA and the exciter and the PA Controller will mute the PAs. At this point an
ISO_Bz fault will be reported in the fault log and the transmitter will mute
momentarily. This fault will most likely be proceeded by PA and PA_ISO faults
which have imbalanced the Z-Plane output. PA currents, voltages and temperatures
and PA_ISO load temperatures should be checked as a likely cause of this problem.
6.9.24 EXC#_FAULT, Fault
Indicates there is an exciter malfunction. This is a summary fault including VSWR,
Overtemp, etc.
6.9.25 EXC#_LOW, Fault
If forward power drops to 70% or less of normal exciter RF output an indication is
given.
6.9.26 EXC#_AFC Fault
This is the PLL Unlock fault from the DIGIT Exciter or the SuperCiter. It causes no
direct transmitter action, but is merely displayed in the fault log and on the front
panel fault light. Action will not be taken until an exciter low power condition is
detected. The controller will delay 10 seconds to give the exciter time to recover,
then switch to another exciter (if available).