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FACE PLATE
This overlay is found on our Sports Trainer, Pro Sports Trainer, and CRT models and is screwed onto the
Upper Display Board.
FRAMES (SIDE)
One on either side, these connect with the Deck Slats and Motor Pan to form the frame of the machine.
FRAME COVERS (SIDE)
These sit on top of the Frame Rails and keep Deck in place. They also form the base for the Traction Strip.
IR POTENTIOMETER
The IR Pot is located on the PWM Motor Control Board and is used to adjust the time it takes the PWM to
react to a load or amperage spike. It normally requires adjustment if the motor feels like its surging.
MEMBRANE PANEL
This takes information from the display membrane keys and transmits it to Upper Display Board via the
ribbon cable. It is found on the PT, CT, and ET models.
PWM (Pulse Width Modulation) Motor Control Boards- Used mostly in home models but occasionally in
commercial units. This circuit board is designed to run the drive motor. It takes the AC voltage from the
wall outlet and changes it to DC voltage to run the drive motor. The AC voltage comes in on the L1 line
and L2 line terminals on the PWM where it's rectified (change from AC to DC) and comes out as DC on
terminals A+ and A- (Armature + and Armature -). Since the PWM motor control switches at such a high
frequency, the DC voltage produced is "clean" and relatively free of electrical noise or static. In other
words, it needs no external Capacitor or Choke (Inductor) to run the drive motor. It receives its commands
from the Upper Display Board via the Relay Board. Generally these need the voltage coming out of the
outlet to be + or – 8 % of the PWM rating. For example a 115v PWM should have outlet voltage of at least
106v with a maximum of 124v.
RELAY BOARDS
This circuit board controls the elevation relays, belt relays, DC transformer (for Upper Display Power), and
diagnostic lights. It is only found on mills with PWM Motor Control Boards.
SAFETY LANYARD
This is a safety feature that completes a switch in the Display Board . If it is not connected the treadmill will
not run.
SCR (Silicon Controlled Rectifier) Motor Control Boards-Used in LTD (110v) and Club Models (220v)
This circuit board is designed to run the drive motor, elevation relays, the belt relay, DC transformer for
power to Upper Display Board, and on board diagnostic lights. The SCR requires a Capacitor and Choke to
provide "clean" power to the Drive Motor. It receives its commands from the Upper Display Board and
eliminates the need for a Relay Board. These require outlet voltage of + or – 10% of the SCR rating.
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