Trouble Shooting
| Step | Cause | Solution | Parts |
| 1 | Bridge board BBA78 defective. | Replace bridge board BBA78. | Bridge board (004-3264-9-SP) |
| 2 | BBA78 to main board FFC defective. | Replace FFC cable. | FFC cable (104-5310-9-SP) |
| 3 | Front door cover open sensor defective. | Replace front door cover open sensor. | Cover open sensor (008-0364-9-SP) |
| 4 | Main board defective. | Replace main board MBA890. | Main board: AM7630i (004-3479A-9-SP) AM7640i (004-3479B-9-SP) AM5630i (004-3479C-9-SP) AM5640i (004-3479D-9-SP) |
