Precor 9.23 Service Manual page 19

4. Insert the AC power cord in the AC outlet and set the on/off switch in the "on" position. Set
the treadmill to operate in the manual program. Connect an AC voltmeter between terminal
of 1 (red wire) and terminal 2 (white wire) of the JK4 connector on the lower PCA. Press the
INCLINE key. The UP LED should illuminate and the AC voltmeter should read AC line
voltage (105 to 120 VAC). If the incline operated normally in the upward direction skip to
step 8.
5. If the display indicated that the incline should be moving upwards and the UP LED did not
illuminate the problem is probably in the data cable between the upper and lower PCA.
Replace the data cable per Procedure 6.11.
6. If the UP LED illuminated and the AC voltage reading in step 4 was absent or significantly
low, the problem is probably in the lower PCA. Replace the lower PCA per Procedure 6.3.
7. If the voltage reading in step 4 was correct and incline motor did not move, the problem is
probably the incline motor. To verify the lift motor's condition, remove power from the
treadmill and measure between terminals 1 and 2 of JK4 with an ohmmeter. The motor
winding should measure approximately 27Ω. If the measurement is significantly high,
replace the incline motor per Procedure 6.1.
8. Connect an AC voltmeter between terminal 2 (white wire) and terminal 3 (black wire) of the
JK4 connector on the lower PCA. Press the INCLINE
illuminate and the AC voltmeter should read AC line voltage (105 to 120 VAC)
9. If the display indicated that the incline should be moving downwards and the DOWN LED
did not illuminate the problem is probably in the data cable between the upper and lower
PCA. Replace the data cable per Procedure 6.11.
10. If the DOWN LED illuminated and the AC voltage reading in step 8 was absent or
significantly low, the problem is probably in the lower PCA. Replace the lower PCA per
Procedure 6.3.
11. If the voltage reading in step 8 was correct and incline motor did not move, the problem is
probably the incline motor. To verify the lift motor's condition, remove power from the
treadmill and measure between terminals 2 and 3 of JK4 with an ohmmeter. The motor
winding should measure approximately 27Ω. If the measurement is significantly high,
replace the incline motor per Procedure 6.1.
12. If you have performed all of the procedures above and have been unable to correct the
problem, call Precor customer support.
13. Remove Jk3 connector from the lower PCA, refer to Diagram 5.2. With an ohmmeter,
measure between pins 1 and 3 of JK3 (red and black wires). You should measure
approximately 10 KΩ (10,000Ω).
20081-118
9.23, 9.27 Treadmill
key. The DOWN LED should
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