Using the trouble analysis chart and faults table provided in the illustrations, if the adaptive digital steering system was malfunctioning, but no fault codes are present on the display unit, what is most likely the problem if the DC/DC converter LED status indicator is functioning properly and the CPU LED status indicator is blinking? See illustration EL-0197. See illustration EL-0198.
• Adaptive digital steering system fault isolation using a trouble analysis (flow) chart • Meaning of LED status indications for the DC/DC converter and CPU assembly • Relationship between power supplies, control electronics (CPU), and output devices (like servo amplifiers)
• Start at the symptom: system is malfunctioning but shows no fault codes. On the trouble chart, where does that path lead when both LEDs show normal/blinking status? • If the DC/DC converter LED is normal and the CPU LED is blinking (indicating it is powered and running), which remaining component in the chain could still prevent correct steering operation? • Ask yourself: which option is not a power/logic problem, but could still cause the steering to fail even though the CPU and its power supply appear normal?
• Verify from the chart what a blinking CPU LED signifies (normal operation vs fault). • Confirm that a functioning DC/DC converter LED normally rules out DC/DC converter and upstream AC/DC supply problems, unless the chart says otherwise. • From the remaining choices, identify which component is downstream of the CPU and could stop the rudder from moving even when the CPU is operating and power is good.
No comments yet
Be the first to share your thoughts!