008 Sears CA Treadmill Service Manual [rev 1.0] |
1
Section Two |
Voltage Checks
Upper Board Checkpoints
Procedures:
Using a dc volt meter (if non-auto ranging set for the 20vdc range), test the voltage at the grey and again at the
white console cable connections using the yellow, orange or red wires as ground. Two tests are to be performed;
test once with power on before the treadmill is started and again after Start is pressed.
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
Voltage After Start
Console Cable Grey to Yellow (Gnd)
0.0 vdc
0.3 +/- .3 vdc, increases as speed increases.
(as shown on console)
Console Cable White to Yellow (Gnd) 4.3 +/- .3 vdc
0.0 vdc
Lower Board Checkpoints
Console Cable Connection
Procedures:
Using a dc volt meter (if non-auto ranging set for the 20vdc range), test the voltage at the grey and again at the
white console cable connections using the yellow, orange or red wires as ground. Two tests are to be performed;
test once with power on before the treadmill is started and again after Start is pressed. Note: this is the same
procedure as the upper board console cable connection. If results vary from the upper board, the console cable is
the likely cause and a continuity check should be performed.
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
Volatge After Start
Console Cable Grey to Yellow (Gnd)
0.0 vdc
0.3 vdc, increases as speed increases.
(as shown on console)
Console Cable White to Yellow (Gnd) 4.3 vdc
0.0 vdc
Note: 2.75 Hp motors and higher: the reading on the console cable -white to yellow (gnd) is 1.6 + or - .3vdc
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 obstructed. 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 component.
Checkpoint
Voltage With Sensor
Obstructed
Voltage With Sensor Not Obstructed
Yellow Digital Speed Sensor
5.0 +/- 0.4 vdc
0.3 vdc
Red Digital Speed Sensor
5.0 +/- 0.4 vdc
5.0 +/- 0.4 vdc
>>
No Motor Movement Voltage Checkpoints
