Nautel XR12 Troubleshooting Manual

Also see for XR12: Installation manual Operation and maintenance manual Preinstallation manual

Contents

XR12 Troubleshooting Manual Responding to alarmsPage 1-26 Issue 3.0 2009-07-28Special ToolsRequired special tools:• A torque wrench with a torque range of 0.0 to 2.26 N-m (0 - 20 in.-lbs). Required for install-ing MOSFET attaching hardware.• A 5 mm (0.197 in.), hex, thin-walled socket, with the same size drive as the torque wrench.The outside diameter of the socket must be less than 7 mm (0.275 in.).• A 5 mm (0.197 in., hex nut driver. The diameter of the outside wall must be less than7 mm (0.275 in.).• A 2.5 mm (0.098 in.), hex screw driver (Nautel part # HAZ65), included in the ancillary kit.Electrostatic PrecautionsThe RF power module contains semiconductor devices that are susceptible to damage fromelectrostatic discharge. Be sure to follow the electrostatic precautions in “Electrostatic protection” onpage 1-3 at all times.Fault Alarm ResponseIf possible, determine which LEDs on the front of the RF power module were turned on prior to itsremoval from the transmitter.• If it is not known which front panel LEDs were on, or if none were on, proceed to “Prepa-ration for testing” on page 1-27.• If the RF Drive LED was on, connect the module to the test cable (see “Test cableconnection” on page 1-30) and perform the “RF drive tuning check” on page 1-36. If theproblem persists after tuning, suspect the module’s RF drive control PWB.• If the Temp/Inhibit LED was on, connect the module to the test cable (see “Test cableconnection” on page 1-30) and perform the “Temp/inhibit check” on page 1-36.• If one or more Block LEDs were on, proceed to “Preparation for testing” on page 1-27.NOTE:If the digital multimeter does not have diode checking capability, a dc voltage source (9 V dcbattery) is required to turn on MOSFETs during troubleshooting procedures.