Nautel NV40 Troubleshooting Manual

Also see for NV30: Operation and maintenance manual

Nautel NV40 Troubleshooting Manual Manual pdf 42 page image

NV40/NV30 Troubleshooting Manual Responding to alarmsPage 1-34 Issue 3.2 2014-12-105. Obtain the RF power module to be tested. Remove the RF power module’s right-hand sidecover and, using four M4 screws from the cover, install the module cover runner (NautelPart # 206-5355) at the bottom of the module’s open side. The runner provides addedmechanical 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-edgeconnector mates with the NV extension module. Firmly tighten the screws that wereinstalled 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 associatedpower 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 andreturn the RF power module to the transmitter cabinet. Press the Reset button on the AUIto return the RF power module to service.Troubleshooting 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• NV40/NV30 station spares kit, if purchased (contains replacement PA PWBs)• NV40/NV30 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.