NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-33
5. Obtain the RF power module to be tested. Remove the RF power module’s right-hand side
cover and, using four M4 screws from the cover, install the module cover runner (Nautel
Part # 206-5355) at the bottom of the module’s open side. The runner provides added
mechanical stability for the module under test while its cover is removed.
6. Carefully push the RF power module into the module extension support so that its card-edge
connector mates with the NV extension module. Firmly tighten the screws that were
installed in Step 4.
7. Set the switch on the front of the RF power module to its ‘up’ (enabled) position.
8. Press the Reset button on the AUI to enable the RF power module and its two associated
power supplies. Test or troubleshoot the RF power module as desired.
9. Reverse the steps in this procedure to remove the RF power module extension test jig and
return the RF power module to the transmitter cabinet. Press the Reset button on the AUI
to return the RF power module to service.
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
• NV5/NV3.5 station spares kit, if purchased (contains replacement PA PWBs)
• NV5/NV3.5 site spares kit, if purchased (contains replacement cooling fans)
• Electrical schematics SD-21 through SD-26 in Section 5 of this manual.
• Mechanical drawing
MD-14 through MD-18 in Section 6 of this manual.
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