Greetings,
I am new to this esteemed forum and require some assistance and advice.

I am trying to locate the related V+ and V- on my treadmill board (B102S S07 Shanghai Elect) to hook up on a Signal Freq Gen (XY-KPWM) to run my DC motor.

Background:
My treadmill console acts faulty (occasionally ask for safety key although installed) so I would like to replace it with a pwm controller to run the treadmill motor only.
So, I suspect for the four connections required on the signal generator are:

PWM = Yellow wire PWM
Ground= Purple wire GRD
V+ = Green wire VDD ?
V- = ?

Can you please help me locate the related wires from the lower control board.
Thank you in advance.

 

You need to know the frequency of the PWM and also its amplitude.
Measure any suspected power source conductors for voltage, IOW, are they a source of voltage, or require it?
Are the conductors shown, going up to the console?