Precor Experience 700 line Series, Service Manual

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Possible Fault Causes:
l
Lift motor cable connector pins damaged or not properly seated (plugged in)
l
Damaged lift motor windings.
l
Lift platform is physically jammed and unable to move.
l
Lift fuse is blown (open).
l
Bad MC lift motor control circuitry.
1. Check for damaged lift motor cable wiring and/or connectors:
Inspect the lift motor cable wires and connector pins for damage which could cause an
open or short circuit condition. Make sure the cable connector is properly connected and
seated to the MC LIFT connector. Test the incline lift system operation. if the lift system
does not correctly operate, continue procedure.
2. Switch the input power OFF. Disconnect the MC LIFT connector. With an ohmmeter,
measure between terminals 5 (white) & 1 (black) and 5 (white) & 2 (red) of the lift motor
cable LIFT connector. Both readings should be approximately 12 ohms for a 120VAC
lift motor and approximately 24 ohms for a 240 VAC lift motor. If either reading is sig-
nificantly high or open replace the lift motor
3. Disconnect the lift motor tube from the lift platform. If the lift platform is jammed, dis-
connect the lift motor from the lift platform. If the lift tube or lift nut is jammed against the
motor housing, rotate the lift nut or lift tube away from the motor housing:
a. If the lift motor was jammed, make sure the lift fuse is good. Do the
Check for a
blown lift motor fuse step.
b. If the lift motor was jammed, recalibrate the lift motor and reinstall the lift motor
into the lift platform, see "Lift Motor Calibration" on page 49 .
c. Verify the lift movement and operation. if there are remaining lift motor fault con-
ditions, continue procedure.
4. Check for a blown lift motor fuse:
a. Remove the MC, see "Motor Controller (MC) Replacement" on page 89 .
b. The lift motor fuse (2 Amp) is located on the LPCA
1
board in the MC module.
Remove the MC bottom cover to access the fuse. Use a small standard screw-
driver to unsnap the clip fasteners and remove the cover.
c. Remove the fuse and use a multimeter to measure the resistance across the fuse
leads. The resistance will read almost zero ohms for a good fuse. any high or infin-
ite resistance reading indicates the fuse is bad (open circuit).
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 circuited lift
motor capacitor (see
Verify the lift motor capacitor step), or a bad MC lift switch
1
Lower PCA board
Page 190
6 Troubleshooting
System Troubleshooting Procedures