3. Rotate the step-up pulley so that the speed sensor magnet is not near the speed
sensor.Using a DC
1
voltmeter, measure the voltage between terminal 1 and terminal
2 of J8 on the lower PCA
2
. The measurement should be approximately 5 Vdc. If the
measurement is correct, skip to step 4. If the voltage is missing or significantly low,
disconnect the speed sensor and repeat the voltage measurement on the J8 on the
lower PCA. If the measurement is now correct (5 Vdc), replace the speed sensor. If
the voltage is still missing or significantly low, replace the lower PCA. Verify operation
and return to service
4. Rotate the step-up pulley so that the speed sensor magnet is next to the reed switch.
Using a DC voltmeter, measure the voltage between terminal 1 and terminal 2 of J8
on the lower PCA. The measurement should be approximately 0 Vdc. If the voltage is
5 Vdc or significantly high, replace the speed sensor2. Verify operation and return to
service.
5. With an ohmmeter connected to terminals 1 and 2 of J8 on the lower PCA, rock the
step-up disk forward and backward so that the magnet is passing in front of and away
from the reed switch. The ohmmeter should alternate between continuity (very low
resistance) and infinity (open circuit). If the resistance measurement does not altern-
ate between continuity and infinity, repeat steps 2 through 4. If the resistance does
alternate between continuity and infinity, continue procedure.
6. If you have performed all of the above tests and the stride rate is not displayed when
the unit is operated, there are three parts that could cause the problem. There are not
any good tests to check these parts other than substituting a known good part. They
are lower PCA, data cable and upper PCA. Replace only one part at a time. If the new
part does not correct the problem, replace the original part.
7. If you have performed all of the above tests and the speed sensor is still not func-
tioning, call Precor Technical Support.
1
Direct Current: electrical current that only flows in one direction.
2
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.
Page 226
7 Troubleshooting
System Troubleshooting Procedures
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