Precor Precision 400 Series Service Manual page 115

5. Connect an AC voltmeter between terminals 1 & 4 of the J1 connector. Set the tread-
mill in the manual program and press the LIFT ▲ key. The AC voltmeter should read
AC line voltage (120 VDC) and the red UP LED should illuminate. Note that the AC
line voltage reading will only be present before an error condition is displayed.
6. If the F2 fuse is good and the UP LED illuminates and the AC voltmeter does not read
the presence of AC line voltage replace the lower logic PCA.
7. If the UP LED does not illuminate and the display indicates that the lift should be mov-
ing upward, replace the upper PCA.
8. If the AC voltmeter reads the presence of AC line voltage and an error 40 is displayed,
go to Lift motor connector resistance
9. If the AC voltmeter reads the presence of AC line voltage and an error 42 is displayed,
go to Inspect lift motor
Lift motor connector resistance check
10. Set the treadmill's circuit breaker in the "OFF" position and remove the AC line cord
from the AC outlet. Remove the lift motor connector from the J1 connector on the
lower PCA. Visually inspect the lift motor connector for broken or improperly crimped
connections. Using an ohmmeter, read the resistance between terminals 1 & 4 and
between terminals 3 & 4. Both readings should be approximately 12 W. If either read-
ing is open or very high resistance, replace the lift motor.
Inspect lift motor connectors
11. Set the treadmill's circuit breaker in the "OFF" position and remove the AC line cord
from the AC outlet. Remove the lift motor connector from the J7 connector on the
lower PCA. Visually inspect the lift motor connector for broken or improperly crimped
connections. Using an ohmmeter, measure between terminals 1 & 3, 1 & 2 and 2 & 3
of the lift motor connector. Terminals 1 and 3 should read approximately 1 KW. The
sum of the two readings between terminals 2 & 3 and 1 & 2 should total approximately
1 KW. If either reading is open or very high resistance, replace the lift motor.
12. Set the treadmill's circuit breaker in the "OFF" position and remove the AC line cord
from the AC outlet. Remove the lift motor connector from the J1 connector on the
lower PCA. Visually inspect the lift motor connector for broken, frayed or improperly
crimped connections. Using an ohmmeter, read the resistance between terminals 1 &
4, 3 & 4 and 1 & 3. The readings should be approximately 12 Ω, 12 Ω, and 24 Ω
respectively. If the reading is significantly low, replace the lift moto.
1
LPCA Replacement
1
Lower Printed Circuit Assembly board; also refered to as the Lower PCA or simply as the
lower board. On treadmills, it is the console to base function interface and the motor con-
troller unit (MCU). On self-powered units, it is the lower PCA console to base function inter-
face.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
check.
connector.
7 Troubleshooting
System Troubleshooting Procedures
Page 108