Nautel Vector-LP VR125 - Page 100

Vector-LP Radio Beacon Transmitter Technical Instruction Manual Page 5-6 Section 5 Maintenance and Troubleshooting Issue 1.1
Table 5-1: Troubleshooting and Replacement Tips (Continued)
Front Panel LED
Status Message
Action
See Troubleshooting/ Replacement Paragraph
See Re-calibration Paragraph
Exciter Monitor Fault
A or B
Indicates a fault in a monitor PWB. The Monitor Fault will be accompanied by an indication of the fault. If it is not accompanied by a specific fault, replace the exciter monitor/generator PWB [side A (A7) or side B (A10)].
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10
Exciter E/G not responding A or B Indicates that an exciter monitor/generator PWB is not responding. Replace the exciter monitor/generator
PWB [side A (A7) or side B (A10)].
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10
Exciter Mon PGM Fault A or B Indicates that an exciter monitor/generator PWB has an EEPROM or Flash memory error. Replace the
exciter monitor/generator PWB [side A (A7) or side B (A10)].
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10
Exciter Keying Gate Monitor Fail A or B Indicates that the tone level is not at the correct level. Ensure that the thresholds have been set up correctly.
If they have been, and the tone is at an adequate level, replace the exciter monitor/generator PWB [side A (A7) or side B (A10)]. As long as this fault persists, output power is inhibited.
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10
Exciter Pwr. Monitor Fail A or B Indicates that the transmitter’s output power is outside of the desired thresholds. If there is no accompanying
error message, a power amplifier (A3) in an RF power block may be damaged. Try operating the transmitter at rated power. If the problem persists, check/replace FETs on the associated power amplifier.
5.6 3.6.13.4 (ensure the
replaced/repaired module is on the standby side)
Exciter Mod Depth Fault A or B Indicates that the transmitter’s modulation depth is below the desired low limit. Ensure that the thresholds
have been set up correctly. If they have been, and the mod depth is at an adequate level, replace the exciter monitor/generator PWB [side A (A7) or side B (A10)].
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10
Exciter Monitor Fail Indicates that one, not both, of the exciter monitor/generator PWBs [side A (A7) or side B (A10)] requested a
changeover. It is typical for a brief monitor fail event to occur after a changeover. If the problem persists and the transmitter is not operating near an alarm threshold, replace the faulty exciter monitor/generator PWB [side A (A7) or side B (A10)].
5.8.2 4.3.5.5 (if applicable)
4.3.5.6 (if applicable) 4.3.5.7 (if applicable) 4.3.5.8 (if applicable) 4.3.5.9 (if applicable) 4.3.5.10