Procedure 6.6 - Troubleshooting The Incline System - Precor C576i Service Manual

Procedure 6.6 - Troubleshooting the Incline System

The incline motor is a 12 Vdc motor with an internally driven 1 KΩ potentiometer used to track
ramp position. Because the incline motor is a DC motor, incline motor direction is controlled by
the polarity of the DC voltage applied to the incline motor. When a positive voltage is applied to
the incline motor, the incline motor will move upward. When a negative voltage is applied to the
incline motor, the incline motor will move downward. As the incline motor moves the 1 KΩ
potentiometer is rotated via an internal gear drive system. The potentiometer's changing
resistance is fed to the incline control system and converted to and A/D (analog to digital) reading
that is used in the diagnostics system to indicate ramp position.
The ramp operating system has a battery monitoring system. If the battery voltage falls below 11
Vdc when ramp movement is initiated or the battery voltage falls below 10 Vdc after ramp
movement has been initiated, ramp movement will be stopped and the message "NO RAMP
LOW VOLTAGE" will be displayed. Ramp 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 rear cover. 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 Ω 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 4.
4. Enter the diagnostic program per Procedure 3.2. Using the diagnostic program allows you to
test the incline system without continuously pedalling the unit. Connect a DC volt meter to
the J3 connector on the lower PCA as follows: voltmeter common lead to terminal 3 (black
wire) and voltmeter "hot" lead to terminal 2 (red wire). Using the CROSSRAMP
operate the incline. The voltmeter should read +12 Vdc when the incline is instructed to
move upward and -12 Vdc when the incline is instructed to move downward.
If when the CROSSRAMP keys are pressed, the display does not indicate that the incline
5.
should be moving, troubleshoot the upper PCA and keypad per Procedure 6.2.
6. If the voltage measurements in step 4 are correct continue with step 7. If the either voltage
measurement in step 4 is significantly low, replace the lower PCA.
7. Verify that all of the wires in the intermediate cable (the cable inserted in to J3 of the lower
PCA) are securely inserted into the connector housing and providing a good electrical
connection.
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