d. Replace the fuse if bad. Switch the power ON. If the fuse immediately blows
after power up, troubleshoot the issue causing the blown fuse including: lift
motor cable wires or connector pins short circuiting (inspect cable), a short cir-
cuited lift motor capacitor (see
Verify the lift motor capacitor
step), or a bad MC
lift switch can cause the lift platform to jam which in turn can cause a blown lift
fuse (see
Lift motion in only one direction
step).
5. Verify the lift motor capacitor.
The lift capacitor is mounted inside the lift motor. If the lift capacitor is shorted, the lift
fuse will blow (open). If the lift capacitor is leaky, it may work for lighter people and not
for others. If the lift capacitor is open, the lift platform will not move.
a. Shorted lift motor capacitor test: Disconnect the lift motor connector from the
MC and using an ohmmeter measure between pins 7 (red) 8 (Black) of the lift
motor connector. If the resistance is 0 ohms, replace the lift motor.
b. Leaky or Open lift motor capacitor test: Connect the lift motor cable connector
to the MC. With the incline below 15% (to allow room for lift travel), measure the
AC voltage between pins 7 (red) and 8 (Black) of the lift motor connector.
Select the manual running program and press the INCLINE UP control. The AC
voltmeter should momentarily read between 1.5 to 2.0 times the AC line
voltage. If this reading is significantly low, replace the lift motor. Note that the
AC line voltage reading will only be present for a short period before an error
condition is displayed
6. Lift motion in only one direction:
A failed MC lift switch or failed lift motor winding can cause this failure.
a. A shorted MC lift switch will cause uncommanded UP or DOWN lift movement
as soon as the machine is powered up. Typically this fault will cause the lift
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
Page 271
7 Troubleshooting
System Troubleshooting Procedures
