Troubleshooting The Incline System - Precor AMT Series Service Manual

2 The following voltage reading must be taken while the unit is in
motion. Extreme care must be taken to keep meter wires, hands, etc.
clear of all moving parts. Using an AC voltmeter, measure the
voltage between red and black, red and white and black and white
wires at 3 Phase Gen In of the lower PCA. AC voltage readings will
vary depending on the unit's stride rate at the time the measurement
is taken. At a stride rate of 50 strides per minute, all three
voltage readings will be approximately 40 VAC - 45 VAC.
3 If any of the readings in step 2 are significantly low, replace the
generator. If you have performed all of the above tests and are
unable to resolve the problem, contact Precor customer support.

Troubleshooting the Incline System

The incline motor is a 12 Vdc motor with an internally driven 1KΩ
(Ohms) potentiometer used to track ramp position. Because the incline
motor is a DC motor, direction is controlled by the polarity applied to
the incline motor. When a positive voltage is applied to the motor, the
motor will move upward. When a negative voltage is applied to the
motor, the motor will move downward. As the motor moves, the 1 KΩ
(Ohms) potentiometer is rotated via an internal gear drive system. The
potentiometer's changing resistance is fed to the incline control
system and converted to an A/D (analog to digital) number that is used
in the to indicate ramp position.
The operating system has a battery monitoring system. If the battery
voltage falls below 11 Vdc when stride height movement is initiated or
the battery voltage falls below 10 Vdc after the ramp movement has been
initiated, ramp movement will be stopped and the message ERROR 46 will
be displayed. Stride Height motion will not be enabled until such time
as the battery voltage exceeds the above limits. The battery voltage
must be raised to correct this condition either by battery charging or
battery replacement. This is strictly a battery problem and not a
incline system or incline motor problem.
1 If an Error 40 (no incline movement) is being displayed continue
with step 2. If an Error 42 is being displayed (incline out of
range) skip to step 12.
2 If the incline moves briefly and then displays an Error 40, skip to
step 12. If the incline does not move prior to displaying the Error
40 continue with step 3.
3 Remove the gasket, top cover, front cover, back cover, center beam
cover, back cover and right side cover.
which should be approximately 12 vdc. Remove the in-line 10 amp slow
blow 3AG fuse and check with the ohms setting on the multi-meter.
The fuse should read 1 ohm or less.
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Check the battery voltage
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