Horizon Fitness RST 5.6 Service Manual page 22

Digital Speed Sensor Connection
Procedures:
Using a dc volt meter (if non-auto ranging set for the 20vdc range); test the voltage at the red wire and again at the yellow wire using the
blue, black or black as ground. The yellow wire should be measure twice, once with the optic speed sensor obstructed and once not obstruct-
ed. This can be done by slowly turning the motor and aligning the tines or open spaces of the optic disk with the sensor.
Desired Results:
The voltage charts contain typical desired results on a fully functional system. A variance from the norm would indicate a defective compo-
nent.
Checkpoint
Yellow Digital Speed Sensor
Red Digital Speed Sensor
Drive Motor Connection
Procedures:
Using a dc volt meter (if non-auto ranging set for the 200vdc range), test the voltage at the red and black motor leads with the motor still
attached.
Note 1: This should be tested after the console cable and speed sensor points as they can give the same results as a defective lower board.
Note 2: A non-functional system may still have a voltage present with no motor attached. For accurate results, the motor must be attached
when the voltage is checked.
Desired Results:
The voltage charts contain typical desired results on a fully functional system. A variance from the norm would indicate a defective
component.
Checkpoint Voltage Before Start
Across Motor Out,
No Motor Attached
Across Motor Out,
W/ Motor Attached
Drive Motor Checkpoints
Procedures:
Unplug the motor from the lower board. Using a dc volt meter (if non-auto ranging set for the 20vdc range), attach volt meter leads directly
into the motor leads and turn the running belt.
Desired Results:
The motor should generate 5-15 vdc depending on the speed it is turned.
Procedures:
Unplug the motor from the lower board. Using an ohm meter (if non-auto ranging set for the 200 ohm range), attach ohm meter leads
directly into the motor leads.
Desired Results:
The motor should read approximately 1.0-1.5 ohms.
22 | rst 5.6 & rct 7.6 service manual 2007_rev1.0
R S T5. 6 & R CT 7 . 6 S e a r s S e r v i c e M a n u a l 2 0 0 7
N o M o to r M o ve me n t V o l t a g e Ch e c k p o i nt s
Voltage With Sensor
Obstructed
5.0 vdc
5.0 vdc
Voltage After Start @ 0.5mph
0.0-22.5 vdc
0.0 vdc
Voltage With Sensor Not
0.3 vdc
5.0 vdc
0.0-22.5 vdc
2.5-10 vdc
Obstructed
Voltage AFter Start @ 10.0mph
0.0-22.5 vdc
100.0 vdc