I buy and sell pre-owned fitness machines (treadmills, ellipticals and exercise bikes). Over the past several months I've accumulated several machines that have circuit board issues. Up until now, I've just been replacing whole boards when there is a problem. However, I'm at the point where I'd like to try to see if I can repair some of these boards rather than replacing them. It would also be great to save a little money, as well as the sense of accomplishment at learning to fix them.
I've purchased a thermal imaging camera that works with my iphone. Its a Flir One Pro. I've included some shots below of this current project. Its a Horizon wt751 treadmill that turns on, console lights, incline works, everything looks fine until you press the START button to get the belt moving, it does the 3, 2, 1 countdown, the relay clicks in, but then nothing happens.
Hoping someone here can help teach me how to identify and repair the components at fault. Here are the pics of the motor control board with the 3 areas of interest circled in red:
Thermal image below of cold board before turning on power. Yellow areas here are just reflective surfaces:
Below, the treadmill has power and the heat threshold has been turned up to 150 degrees F. The 3 areas of concern as showing high heat signatures in yellow:
They are from top left, an IC identified with writing as:
1) Top left component > 78M05 (voltage regulator?)
2) middle component > UC3842BN (Switching Controllers 0.5mA Current Mode)
3) Bottom left > R15 and R16 Resistors
I've purchased a thermal imaging camera that works with my iphone. Its a Flir One Pro. I've included some shots below of this current project. Its a Horizon wt751 treadmill that turns on, console lights, incline works, everything looks fine until you press the START button to get the belt moving, it does the 3, 2, 1 countdown, the relay clicks in, but then nothing happens.
Hoping someone here can help teach me how to identify and repair the components at fault. Here are the pics of the motor control board with the 3 areas of interest circled in red:
Thermal image below of cold board before turning on power. Yellow areas here are just reflective surfaces:
Below, the treadmill has power and the heat threshold has been turned up to 150 degrees F. The 3 areas of concern as showing high heat signatures in yellow:
They are from top left, an IC identified with writing as:
1) Top left component > 78M05 (voltage regulator?)
2) middle component > UC3842BN (Switching Controllers 0.5mA Current Mode)
3) Bottom left > R15 and R16 Resistors