Precor C954i Service Manual download pdf (Page 33)

C954, C956 Treadmill

Page 33

Procedure 5.7 - Troubleshooting the Lift System (version 3)

Lift System Description:

The lift system on these units consists of an AC line voltage driven lift motor (120 Vac), and an

internal 1 KΩ potentiometer for lift position identification. The lift motor contains two motor

windings, one to operate the motor in an “upward” direction and the other to operate the motor in

a “downward” direction. As the lift motor is operated, the motor also rotates the potentiometer via

an internal gear system. Therefore, the position of the lift system can be determined by

monitoring the value of the internal potentiometer. The lift motor is initially set at a known starting

position (calibration, See Procedure 4.1), subsequent motor movement is tracked via the

potentiometer resistance reading.

Note:

All resistance measurements must be performed with power removed from the treadmill.

Performing resistance measurements with voltage applied may damage your ohmmeter.

Procedure

1. If the lift motor operates but creates a lift error (error 40 or 42) go to step 16. If the lift motor

will not move continue with step 2.

2. Set the treadmills circuit breaker in the “off” position and remove the AC line cord from the

AC outlet.

3. Remove the F2 (Lift AC) fuse from the lower PCA. Using an ohmmeter, check the resistance

of the F2 fuse. See Diagram 5.2. The fuse should measure approximately 0.1 Ω or less. If

the fuse is open or high resistance, replace the fuse.

Diagram 5.2 - Lower PCA

Fuse F2

J1 Connector

J7 Connector

J3 Connector

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 72 73

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Precor C954i Service Manual Page 33