Garmin GRA 55 Maintenance Manual - Page 31

Fault Type Electrical Electrical Fault Name +5.75V RF Monitor (Fault also included in POST, Power On Self Test Faults) [1] +5.75V Monitor (Fault also included in POST, Power On Self Test Faults) [1] +3.3V Monitor (Fault also included in POST, Power On Self Test Faults) [1] +1.9V Monitor (Fault also included in POST, Power On Self Test Faults) [1] Current Monitor Description Cause Resolution +5.75 V RF power rail outputs improper voltage Aircraft power input voltage out of range Check aircraft power supply. Cycle power to unit. Internal power supply failure If fault persists, download the assert log and send to Garmin for diagnosis. +5.75 V power rail outputs improper voltage Aircraft power input voltage out of range Check aircraft power supply. Cycle power to unit. Internal power supply failure If fault persists, download the assert log and send to Garmin for diagnosis. +3.3 V power rail outputs improper voltage Aircraft power input voltage out of range Check aircraft power supply. Cycle power to unit. Internal power supply failure If fault persists, download the assert log and send to Garmin for diagnosis. +1.9 V power rail outputs improper voltage Aircraft power input voltage out of range Check aircraft power supply. Cycle power to unit. Internal power supply failure If fault persists, download the assert log and send to Garmin for diagnosis. Aircraft power input voltage out of range Check aircraft power supply. Cycle power to unit. Improper current on +8 V power rail If fault persists, Internal power supply failure download the assert log and send to Garmin for diagnosis. 190-01277-A3 Rev. 1 System Maintenance Manual GRA 55/5500 Bell 206 STC Page 5-5