Service manual

Troubleshooting Procedures
Elevation Problems
If you have elevation problems, follow these steps to diag-
nose and repair the problem(s):
1. Calibrate the unit. Calibration will correct the
problem or diagnose the cause. While the unit is
in calibration, the potentiometer reading should
decrease when going up and increase while going
down. The elevation numbers increase as the
platform rises and decreases as it goes down.
2. If the problem continues, do the following:
a. With the power ON, press the START and
INCLINE UP buttons. The INCLINE UP light
should come on, indicating the command was
received at the lower board. If the light does not
come on: check the connections of the 8 PIN
cables to the upper and lower boards. Replace
the cables if the light on the lower board still
does not respond to the command.
Note: The down light does not respond unless
the machine has elevation.
b. If the UP ELEVATION light comes on, and the
machine does not elevate: disconnect the white
wire (elevation common), black wire (flat unit),
and red wire (folding unit) from the lower board.
Press POWER and START, then push the UP
ELEVATION button. Check the voltage from each
terminal, with a multi-meter. The tool should read
220 to 230 A/C volts.
c. If you do not get a reading of 220 to 230 A/C volts,
but the light responds: change the lower control
board.
d. If you get a voltage reading from these ports
without pressing the UP ELEVATION button,
or the UP light is stuck on: the machine has
a bad overlay or a stuck button on the upper
electronics board. Replace the overlay and the
button.
d. If you get a reading of 220 to 230 A/C volts
when pressing the UP ELEVATION button and
the machine does not elevate: check for an
OHMS reading on the red and black wire of
the potentimeter. Replace the potentiometer if
you do not get an OHM reading. Replace the
elevation motor if you do get readings.
3. Swap the up and down wires to return the machine
to a zero elevation if the unit gets stuck at an
incline. Calibrate the unit. If it does not correct the
elevation problem, follow above steps to diagnose.
Service Manual
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