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 1-43RF Drive Power Supply assembly replacementSee Figure 1.10 on page 1-41.1. Turn off the power at the source and wait (about 5 minutes) for the green LEDs on the B+distribution PWB to turn off, indicating the capacitors are discharged (see Figure 1.9 on page1-40).2. Remove the transmitter’s lower front panel.3. Disconnect all cables attached to the RF drive power supply PWB, taking note of theconnector labels on the cables and the PWB.4. Remove and save four sets of mounting hardware from the base plate under the PWB. (ThePWB is soldered to the base plate.)5. Remove the PWB assembly from the transmitter.6. Reverse Step 1 through Step 5 to reinstall the PWB.Low Voltage Power Supply assembly replacementSee Figure MD-1.1. Turn off the power at the source and wait (about 5 minutes) for the green LEDs on the B+distribution PWB to turn off, indicating the capacitors are discharged (see Figure 1.9 on page1-40).WARNING:Lethal voltages exist inside the transmitter when the power is turnedon. Turn off the power at the source and wait until the green LEDs onthe B+ distribution PWB are off before removing any connections orPWBs (see Figure 1.9 on page 1-40).WARNING:Lethal voltages exist inside the transmitter when the power is turnedon. Turn off the power at the source and wait until the green LEDs onthe B+ distribution PWB are off before removing any connections orPWBs (see Figure 1.9 on page 1-40).