Nautel XR12 Troubleshooting Manual

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

Contents

XR12 Troubleshooting Manual Responding to alarmsIssue 3.0 2009-07-28 Page 1-47Modulator assembly replacement1. Remove the modulator assembly from RF power module. Use the hex screw driver (Nautelpart # HAZ65) from the ancillary kit to remove the modulator assembly’s attachinghardware (four M3 hex head screws) at the rear of the RF power module's heat sink.2. Discard or repair the defective modulator assembly.3. Apply a thin film of thermal compound to the modulator assembly's aluminum heatsinkplate.4. Install the replacement modulator assembly in the RF power module. Mate the modulatorassembly's connector J1 to the modulator input/output PWB's connector in the RF powermodule.5. Secure the modulator assembly to the RF power module's heatsink using the four M3 hexhead screws removed in Step 1 .CAUTION:The heat sinks of modulator assemblies and RF amplifiers are coated with a filmof thermal compound. Use care to ensure the film does not become contaminatedwith foreign particles.When installing an assembly, visually inspect the mating surfaces of its heat sinkand the module's chassis. Ensure both surfaces are coated with a thin film ofthermal compound. Ensure foreign particles that may affect thermal transfer arenot embedded in the compound.