Nautel XR12 Troubleshooting Manual

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

Contents

XR12 Troubleshooting Manual Responding to alarmsPage 1-42 Issue 3.0 2009-07-285. Remove the defective PWB from the transmitter.6. Set the EXCTR A (E1), EXCTR B (E2) and SENSITIVITY (E3) jumpers on the replacementPWB to the same positions as the defective PWB.7. Reverse Step 1 through Step 5 to install the new PWB.Distribution PWB replacementSee Figure 1.10 on page 1-41.1. Turn off the ac power at the source and wait (about 5 minutes) for the green LEDs on theB+ distribution PWB to turn off, indicating the capacitors are discharged (see Figure 1.9 onpage 1-40).2. Remove the transmitter’s lower front panel.3. Disconnect all cables attached to the distribution PWB, taking note of the connector labelson the cables and the PWB.4. Remove and save six sets of mounting hardware.5. Remove the PWB from the transmitter.6. Set the E1 and E2 jumpers on the replacement PWB to the same positions as the defectivePWB. Ensure resistors R86, R87 and R97 on the replacement PWB are the same value as theresistors on the defective PWB.7. Reverse Step 1 through Step 5 to reinstall the PWB.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).