Precor 9.21, Service Manual

9.23, 9.27 Treadmill

Page 18

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

S

 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 interconnect cable between the upper and lower 
PCA. Replace the interconnect cable per Procedure 6.12.

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 27

Ω

. 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

T

 key. The 

DOWN 

LED should 

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 interconnect cable between the upper and 
lower PCA. Replace the interconnect cable per Procedure 6.12.

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 27

Ω

. 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 K

Ω (10,000Ω

).