Precor EFX546 Service Manual download pdf (Page 30)

C546 Self Powered Elliptical Fitness Crosstrainer

Page 30

Procedure 6.6 - Troubleshooting the LIft Motor

The lift motor is a 12 Vdc motor with an internally driven 1 KΩ potentiometer used to track ramp

position. Because the lift motor is a DC motor, lift motor direction is controlled by the polarity of

the DC voltage applied to the lift motor. When a positive voltage is applied to the lift motor, the lift

motor will move upward. When a negative voltage is applied to the lift motor, the lift motor will

move downward. As the lift motor moves the 1 KΩ potentiometer is rotated via an internal gear

drive system. The potentiometer’s changing resistance is fed to the lift 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 lift system or lift motor problem.

1. If an Error 40 (no lift movement) is being displayed continue with step 2. If an Error 42 is

being displayed (lift out of range) skip to step 12.

2. If the lift moves briefly and then displays an Error 40, skip to step 12. If the lift 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 lift 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

, keys operate

the lift. The voltmeter should read +12 Vdc when the lift is instructed to move upward and -

12 Vdc when the lift is instructed to move downward.

5. If when the CROSSRAMP keys are pressed, the display does not indicate that the lift 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 lift 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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Precor EFX546 Service Manual Page 30