Precor C954i Service Manual download pdf (Page 20)

C954, C956 Treadmill

Page 1-20 Page 20

Procedure 5.2 - Troubleshooting the Lift System (version

1 & 2)

Lift System Description:

The lift system on these units consists of an AC line voltage driven lift motor (120 Vac or 240

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

System

Fuse

Fan

Lift

“Up” LED

“Down” LED

J5, Term 1

Fan Wires

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 72 73

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Precor C954i Service Manual Page 20