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Trouble Shooting
| Step | Cause | Solution | Parts |
| 1 | Ultrasonic receiver broad defective. | Replace the ultrasonic receiver broad SBA261. | Ultrasonic receiver broad (004-2997-9-SP) |
| 2 | Ultrasonic transmitter broad defective. | Replace the ultrasonic transmitter broad SBA260. | Ultrasonic transmitter board (004-2991-9-SP) |
| 3 | Main broad defective. | Replace the main board MBA861. | Main board AD8120U (004-3364-9-SP) AD8120P (004-3364A-9-SP) AD8120UN (004-3364F-9-SP) |
