Nautel NV5LT Troubleshooting Manual

Contents

Nautel NV5LT Troubleshooting Manual Manual pdf 50 page image

NV5LT/NV3.5LT TROUBLESHOOTING MANUAL RESPONDING TO ALARMSPAGE 4.1.42 VERSION 3.3 2016-03-10Troubleshooting RF Power ModulesMaintenance PhilosophyMaintenance on an RF power module consists of replacing PA PWBs or cooling fans.Special Tools and Test EquipmentThe 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 installingattaching hardware for PA PWB FETs. Soldering iron and desoldering tool NV5LT/NV3.5LT station spares kit, if purchased (contains replacement PA PWBs and coolingfans) NV5LT/NV3.5LT site spares kit, if purchased (contains replacement cooling fans) Electrical schematics SD-22 and SD-30 in Section 4 of this manual. Mechanical drawings MD-8 and MD-16 in Section 5 of this manual.Electrostatic PrecautionsThe RF power module contains semiconductor devices that are susceptible to damage from electrostaticdischarge. Be sure to follow the electrostatic precautions in “Electrostatic Protection” on page 4.1.3 atall times.Preparation for Troubleshooting1. Follow the procedure in “Removing an RF Power Module” on page 4.1.40 to remove the RF powermodule from the transmitter.2. Place the RF power module on a suitable work surface.3. Based on the front panel UI or remote AUI alarm that prompted RF power module troubleshooting,replace either the defective PA PWB (see “PA PWB Replacement” on page 4.1.43) or defectivecooling fan (see “Module Cooling Fan Replacement” on page 4.1.45).NOTE: If a failure occurs, you must replace the entire power amplifier PWB, rather than an individualFET. A spare power amplifier PWB (NAPA31C) is provided in the transmitter station spares kit, ifpurchased. To order a station spares kit or replacement power amplifier PWB contact Nautel. Failure toobserve this recommendation may void your equipment warranty or cause further failures.