John:
I repaired a motor controller board for a Sears treadmil a few months
ago. I don't
think it was the same model. My board had about 5 SCRs on a heat sink
that wrapped around the board. Two of the SCRs were bad; replaced them
and that fixed the problem. Some of the SCRs were used as diodes to
convert the input AC to DC to provide the running voltages. I had to
get
the exact same SCRs for the unit to work. They were in TO-220 cases.
Hope this helps..
John G