Nautel XR12 Troubleshooting Manual

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

Contents

XR12 Troubleshooting Manual Responding to alarmsPage 1-34 Issue 3.0 2009-07-285. Repeat Step 3 and Step 4 for the remaining suspect PAs. If any C or G waveform is notsatisfactory (rectangular wave, 0 to 24 V, assuming 50% duty cycle), the PA associated withthe unsatisfactory waveform is defective and must be replaced (see “RF amplifier assemblyreplacement” on page 1-48).6. Install a repaired or serviceable replacement PA in each vacant PA position, and then restartthe tests at Step 1.The following steps list the proper sequence for removing the power module from the transmitter'stest circuit.7. Remove the jumper that connects TP2 to ground (TP3 or TP4) on the RF drive controlPWB that was installed in “Test cable connection”, Step 8. on page 1-32. The Block (A, B, Cand D) alarm LEDs will turn on.8. On the front of the power module under test, press the INHIBIT button. The TEMP/INHIBITalarm LED will turn on.9. Remove the test cable's P3 plug from the power module's J1 connector. J1 is the connectoron the bottom of the power module near the front. Ignore all alarm indications.10. Remove the test cable's P1 connector from the distribution PWB's J11 connector.11. Remove the test cable's P4 plug from the power module's J2 connector. J2 is the lowerconnector on the rear of the power module.12. If repairs of the power module are complete, remove the test load from the power module'sJ3 connector, and remove the test cable's P2 plug from the transmitter's RF drive splitter's J9connectorIf repairs on the power module are not complete, the test load and the test cable'sconnection to the RF drive splitter can remain in place.WARNING:The power module must be removed from the transmitter's test circuitbefore any sub-assembly is installed or removed from the powermodule. Failure to do so can result in damage to the electroniccomponents in the power module.It is important to remove the power module from the test circuit byfollowing Step 7 through Step 12 in the order they are listed to avoidpersonal injury and damage to the power module.