NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-11
Controller: High
Reflected Power
This alarm occurs if the transmitter’s average reflected power
exceeds the high SWR threshold [138 W (NV5 or NV3.5) for FM
mode, 98 W (NV5 or NV3.5) for FM+HD mode, 40 W (NV5 or NV3.5)
for HD mode]. Check for associated alarm(s) that may have caused
the alarm and refer to their troubleshooting action. Inspect the
antenna and transmission line system for damage or de-tuning, else
suspect the control/interface PWB.
Controller: High
Reject Power
This alarm occurs if the power in any single reject load exceeds 67%
of the reject shutback threshold (default is 1800 W in FM or FM+HD
mode; 900 W in HD mode). The alarm will also occur if the summed
power of both reject loads exceeds 89% of the reject shutback
threshold. Check for associated alarm(s) that may have caused the
alarm and refer to their troubleshooting action. This alarm may be
accompanied by a Reject Power Foldback alarm. Typically, high reject
power is a result of RF power module failure or removal. If no other
alarms are indicated, suspect the control/interface PWB.
Controller: High RF
Drive Power
This alarm occurs if the active exciter’s power is greater than the high
RF drive threshold [25 W for analog (FM) mode and 17 W for hybrid
(FM+HD) and all-digital (HD) mode). Compare the exciter’s
programmed level to its actual output. If a difference exists, there may
be an exciter regulation problem.
Controller: Interlock
Open
The external interlock input wired to the control/interface PWB (A1) is
open. Check the interlock connection between TB2-1 and TB2-2 on
the control/interface PWB (verify a ground potential at TB2-1). If the
interlock is intact, check all external interlock switches. Otherwise,
suspect a problem with the interlock circuitry on the control/interface
PWB.
Controller: IPA High
Current Cutback
This alarm occurs if there is a failure in one or more IPA power supply
module [A (U9), B (U10)] and the remaining IPA power supply module
is unable to provide the current required by the IPAs. This alarm is
typically accompanied by one or more Controller: Disable Module
alarms. Check the troubleshooting action in the associated alarm(s).
Alarm (with Prefix) Description and Troubleshooting Action
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