Nautel GV30N, Руководство по устранению неисправностей

Страница: 51 / 365

GV30N TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 0.1 2014-11-01 PAGE 4.1.43
Troubleshooting RF Power Modules
Maintenance Philosophy
Maintenance on an RF power module consists of replacing PA PWBs or cooling fans.
Special Tools and Test Equipment
The following tools and test equipment are required to troubleshoot an RF power module.
 Digital multimeter
 Torque screwdriver, capable of torquing up to 0.67 N-m (6 in.-lbs). Required for installing
attaching hardware for PA PWB FETs.
 Soldering iron and desoldering tool
 GV30N station spares kit, if purchased (contains replacement PA PWBs and cooling fans)
 GV30N site spares kit, if purchased (contains replacement cooling fans)
 Electrical schematics in Section 4 of this manual.
 Mechanical drawing in Section 5 of this manual.
Electrostatic Precautions
The RF power module contains semiconductor devices that are susceptible to damage from electrostatic
discharge. Be sure to follow the electrostatic precautions in
“Electrostatic Protection” on page 4.1.3 at
all times.
Preparation for Troubleshooting
1. Follow the procedure in “Removing an RF Power Module” on page 4.1.41 to remove the RF power
module from the transmitter.
2. Place the RF power module on a suitable work surface.
3. Based on the AUI (local or remote) or controller UI alarm that prompted RF power module
troubleshooting, replace either the defective PA PWB (see
“PA PWB Replacement” on page 4.1.44 )
or defective cooling fan (see “Module Cooling Fan Replacement” on page 4.1.46 ).
NOTE
: If a failure occurs, you must replace the entire power amplifier PWB, rather than an individual
FET. A spare power amplifier PWB (NAPA31C) is provided in the transmitter station spares kit, if
purchased. To order a station spares kit or replacement power amplifier PWB contact Nautel. Failure to
observe this recommendation may void your equipment warranty or cause further failures.