9/15/06
888-2586-001
6-37
WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
Platinum Z16HD+
Controllers will mute all of the PAs. The system can be reset by pressing an ON
button. This fault will only show up if the Master Controller is not operational or
if the ISO APC Foldback routine initiated by the Master Controller fails to reduce
the temperature of the ISO load. The foldback description is in the Master Con-
troller Faults under “System ISO Foldback."
b.
PAC#_ISOAB or PAC#_ISOCD (Isolation or Reject loads on the AB and CD
Hybrid Combiners). This is a temperature fault which is caused by an imbalance
between the outputs of Z Planes A and B, or Z Planes C and D. If one of these
loads reaches 145°C the PA Controllers will mute all of the PAs. The temperature
of these loads is also sensed by the Master Controller. Therefore this fault should
be preceded by a an ISO APC Foldback which will be initiated by the Master
Controller. The PA controllers will protect the system if the Master Controller is
not operational or if the foldback routine fails to reduce the load temperature. The
foldback description is in the Master Controller Faults under “System ISO Fold-
back."
c.
ISO_ABCD (ISO load mounted on the ABCD hybrid which combines the out-
puts of the two power blocks). This is a temperature fault (145°C) which is
caused by an imbalance (in phase or amplitude) between the outputs of the two
power blocks AB and CD. This could be caused by failed PAs or an imbalance
between the outputs of the IPAs. The temperature of this resistor is sensed by the
Master Controller and all 4 PA Controllers. Therefore this fault should be pre-
ceded by a an ISO APC Foldback which will be initiated by the Master Control-
ler. The PA controllers will protect the system if the Master Controller is not
operational or if the foldback routine fails to reduce the load temperature. The
foldback description is in the Master Controller Faults under “System ISO Fold-
back."
!
WARNING:
THE INTEGRITY OF THE AB, CD AND ABCD LOADS CAN BE CHECKED VERY EAS-
ILY JUST USING AN OHMMETER. THE PROCEDURES ARE OUTLINED AS PART OF
THE “SYSTEM TEST” PROCEDURE EARLIER IN THIS SECTION.
6.14.12 PAC#_REF, +5V Reference Fault
This fault means that the +5V reference voltage, which comes from the Life Support
Board and is common to all of the controller boards, is less than 4.6V. This voltage is
used as the reference for all system calibration. A change in this voltage would cause
major errors in system calibration and overload settings and is therefore a critical fault.
If only one of the PA Controllers has this fault, all PAs associated with that board will
be muted and switched out. This fault will show up in the fault log as PAC#_REF
(where # is a number from 1-4).
Содержание Platinum Z16HD+
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