54
Upper display fails to light when START is pressed.
4.1
Plug Treadmill into wall outlet.
4.2
Is green +12V lamp on the motor control board lit?
YES
1.No power from outlet.
2.Loose wire from line cord to motor control board.
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| 3. Blown |
NO |
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| control board. Part # | |
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| 4. Failed motor control board. |
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| Part # 70080 (110V), 70081 (220V) |
4.3 Press START button on membrane panel. 
4.4
Is green +5V lamp on the motor control
board lit?
YES
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| 1. Check connections to control |
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| harness. Part # 70083 |
NO |
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| 2. Replace motor control board. | |
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| Part # 70080 (110V), 70081 (220V) |
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4.5
Is red SERIAL lamp on the motor control
board lit?
YES
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| Replace motor control board. |
NO |
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| Part # 70080 (110V), 70081 (220V) | |
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Replace display board Part # 70076
