NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-1
Section 1: Responding to alarms
This section provides instructions you need when performing troubleshooting on the NV5/NV3.5
transmitter. This section includes the following topics:
• Corrective maintenance
• Electrostatic protection - see page 1-3
• Identifying an alarm - see page 1-4
• Troubleshooting tips - see page 1-23
– AUI screen lockup - see page 1-23
• Removing and reinstalling RF power modules - see page 1-29
• Troubleshooting RF power modules - see page 1-33
• Fan, IPA and Module Power Supply Replacement - see page 1-43
If none of the procedures and alarms described in this section address your problem, contact Nautel
for assistance. See “Technical support” on page ix.
Corrective maintenance
Corrective maintenance procedures consist of identifying and correcting defects or deficiencies that
arise during transmitter operation. Local and/or remote alarm signals are generated when a
malfunction occurs. If an alarm condition is caused by a malfunction in the RF power stage, the
transmitter may maintain operation at a reduced RF output level. The nature of the fault – and station
policy – will dictate whether an immediate maintenance response is necessary. Fault analysis and
rectification may be conducted from three different levels, with a different technical competence level
required for each: on-air troubleshooting, remote or local, and off-air troubleshooting.
CAUTION:
The transmitter contains many solid state devices that may be damaged if
subjected to excessive heat or high voltage transients. Every effort must be taken
to ensure that circuits are not overdriven or disconnected from their loads while
turned on.
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