Precor TRM 811.v2, Service Manual

Page: 60 / 114

© Precor Incorporated, Unauthorized Reproduction and Distribution Prohibited by Law Page 60
Troubleshooting the Incline System
Incline System Description:
The Lift system consists of an AC line voltage driven lift motor (120VAC or 240VAC), and an
internal 1k
Ω
5W potentiometer for lift position monitoring. When you start to troubleshoot the lift
system it is important to determine if the problem is due to an inability to move the lift, or an
inability to monitor the lift position.
This will determine whether you need to troubleshoot the AC voltages going to the motor
windings, or if you need to troubleshoot the DC voltages and/or ohm readings from the
potentiometer. The error log will help determine which is causing the issue.
Press and hold the reset key for at least 6 seconds, if there are errors logged in the error log this
action will take you into the error log.
If there is an error code for a lift system error (Error 40 through 45) logged in the error log, go to
the appropriate error code troubleshooting page and follow the steps for that error.
Note: All resistance measurements must be performed with power removed from the
treadmill. Performing resistance measurements with voltage applied may damage your
ohmmeter.
Operation of lift motor for testing:
In manual operation the treadmill will require the running belt to be moving to operate the lift. For
this reason it is recommended that the servicer use the Machine Tests within the "Hardware
Validation" mode (accessible through Pause-5-1-7-6-5-7-6-1) to check lift operation. This will
allow the lift to move without moving the running belt. Additionally the lift will be able to be
operated independently of the A/D setting being out of range. This allows for the technician to
recover from a lift motor that has erroneously moved beyond the normal operating range.
Error 40 - No Lift Motion Detected
MCL
– Green
ASL
– Yellow Solid
Description
Error indicates that the incline (lift) system has been instructed to start moving and no lift motion
has been detected by the lift position monitoring system.
Possible Causes
1. Lift connector not seated
2.
Lift motor connector pins damaged
3. Lift motor winding blown
4. Lift motor is physically jammed and unable to move
5. Lift capacitor is bad
6. Lift fuse is open
7. The Control Module is bad