Error
- CPU fault observed on the TRAK 9100 GPS Module Receiver.
- The fault occurs intermittently and clears automatically in some cases, but can last longer than 30 minutes.
Environment
- Product: ASTRO TRAK 9100
- Firmware Version:
Root Cause
- The CPU fault on the TRAK system is triggered by a time jump in the 1PPS signal from the GNSS receiver.
- This occurs as a safety measure to ensure the integrity of the 1PPS timing signal sent to downstream equipment.
- The GNSS receiver may provide an incorrect 1PPS signal due to corrupted GPS almanac information downloaded from satellites.
Workaround/Fix
- If the CPU fault clears automatically after approximately 30 minutes, no further action is necessary, as this behavior indicates the internal timing realigned successfully following detection of a time discrepancy.
- If the CPU fault lasts longer than 30 minutes then monitor the unit and if it persist replace the Trak Unit
- For TRAK units prior to version 9101-15/16, a CPU fault indicates a defective module that should be replaced.