Troubleshooting The Incline System - Precor AMT12 Base Service Manual

Troubleshooting the Incline System

The lift motor is a 12 Vdc motor with an internally driven 1KΩ (Ohms) potentiometer used to track
ramp position. Because the lift motor is a DC motor, direction is controlled by the polarity applied to
the lift 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 lift 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. Check the battery voltage 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.
4 Remove the F1 fuse (6.3 amps) from the lower PCA. See Diagram 6.4.
Check the fuses resistance using an ohmmeter. The fuse should read 1 ohm or less. If the reading is
significantly high, replace the fuse. If the fuse is good or replacing the fuse does not correct the
problem, continue with step 5.
Figure 63: Lower PCA Fuse Locations
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