Precor Precision 400 Series Service Manual page 120

If the initial speed sensor voltages are correct, go
initial speed sensor voltage is 0 Vdc or significantly low when a flywheel lobe is between the
speed sensor "legs', continue.
Measure the LPCA voltage between J3 connector terminals 1 (red wire) and terminal 4
(black wire). The voltage should measure approximately 5 Vdc. If the voltage is missing or
significantly low, disconnect the speed sensor plug from the lower
voltage between the J3 connector terminal pins 1 & 4. If the voltage is approximately 5 Vdc,
replace the speed sensor. If the voltage is missing or significantly low, replace the lower
logic PCA.
Contact Precor customer service
If you have performed all of the above procedures and have been unable to correct the prob-
lem, call Precor Customer Support.
See Also
1
Printed circuit assembly, generally referred to as either an upper PCA or lower PCA.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
System Troubleshooting Procedures
Contact Precor Customer
PCA
7 Troubleshooting
Service. If the
1
. Measure the
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