C960 Series Commercial Treadmill
Page 34
Procedure 5.3 - Troubleshooting the Lift System (i Units)
Lift System Description:
The C962i and C964i treadmills were manufactured with two types of lift systems. Units built prior
to April 20, 2000 consisted of an AC line voltage driven lift motor (120 Vac or 240 Vac) and an
external 10 KW potentiometer. The 10KW potentiometer rotates as the lift operates and indicates
the current lift position. The lift system is factory calibrated, but will require re-calibration
whenever the upper PCA is replaced (refer to procedure 4.2). Units built after April 19, 2000,
utilized a lift motor with an internal 1 KW potentiometer. Use the procedure in steps 1-14 for
trpubleshooting units manufactured prior to April 20, 2000. Start with step 15 for units
manufactured after April 19, 2000.
Note:
All resistance measurements must be performed with power removed from the treadmill.
Performing resistances measurements with voltage applied may damage your ohmmeter.
Whenever the upper PCA is replaced on a C962i or C964i manufactured prior April 20, 2000, the
lift system must be re-calibrated.
1. If the lift motor operates but creates a lift error (error 40, 41 or 42) go to step 8. If the lift
motor will not move continue with step 2.
2. Put the treadmill in a condition in which the lift motor is ready to be operated (for example,
quick start into the manual program). Using an AC voltmeter, monitor the voltage across the
lift capacitor and press one of the incline keys. Approximately 1.4 times the AC input voltage
should appear on the lift capacitor when a incline key is pressed. Approximately 170 Vac on
a 120 Vac unit or approximately 340 Vac on a 240 Vac unit. The actual lift capacitor voltage
will vary with the AC input voltage. If AC line voltage or 1.4 times line voltage is on the lift
capacitor go to step 6. If no AC voltage is on the lift capacitor, continue with step 3.
3. Set the treadmill circuit breaker in the “off” position. Remove the 2 amp lift fuse (F2) from the
lower PCA. Using an ohmmeter, measure the fuse resistance. The fuse should measure
approximately 1W or less. If the fuse is open (•) or significantly higher than 1W, replace the
fuse. If the fuse was bad, perform the test in step 4 before applying power to the lift. If the
fuse was good continue with step 5.
4. Using an ohmmeter, measure the resistance across the lift capacitor terminals. The lower
PCA resistance should be extremely high (megohms), the capacitor resistance should be
extremely high (megohms) and the lift motor winding should read approximately 34W (120
Vac units) or 122W (240 Vac units). Therefore, if the measurement is significantly lower
than 34W or 122W, disconnect both red leads from the lift capacitor. Measure the resistance
between the black leads on the lift capacitor and red lead to the lower PCA. If it measures
significantly low, replace the lower logic/lift PCA. Measure the resistance between the black
leads on the lift capacitor and red lead to the lift motor. If it measures significantly low,
replace the lift motor. Measure the resistance between the black leads on the lift capacitor
and other terminal of the lift capacitor. If it measures significantly low, replace the lift
capacitor.
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