Horizon Fitness E51 Service Manual page 36

IC Board Voltage Check (Programmable
Resistance)
To check for voltage going to the IC board, place the positive lead of
your multimeter on the top soldered pin on the backside of the IC board
and the negative lead on the second soldered pin on the backside of the
IC board. The voltage reading should be between 5 to 6 volts DC.
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