Precor C842 Service Manual page 34

Diagram 6.8 - Alternator, C846 version 1
"P" Terminal
"EXC" Terminal
10. With the ohmmeter still on the diode scale, connect the Ω lead of the ohmmeter to the "P"
terminal and the common lead to the "E" terminal of the alternator. The ohmmeter should
read open (∞). Connect the Ω lead of the ohmmeter to the "P" terminal and the common
lead to the "B" terminal of the alternator. The ohmmeter should read approximately 0.5.
11. Reconnect the J1 connector.to the lower PCA
12. If the voltages in step 5 were not correct and the resistance readings in steps 6, 7 and 8
were correct, replace the lower PCA.
13. If the resistance readings in steps 7, 8 and 9 were not correct replace the alternator.
14. If you have performed all of the previous tests and have not been able to locate the trouble,
call Precor customer support.
15. Enter the "manual" program and set the work level at "level 20". Pedal the cycle and confirm
that there is no resistance or that the resistance is abnormally low.
Note:
The voltage readings in this procedure will vary with the pedaling rate. Pedal the cycle at
approximately 60 RPM with the work level set at "10" while taking the voltage readings in this
procedure. Resistance readings must be taken with the power off and the cycle idle.
16. Measure the DC voltage at the terminals M1 and M2 of the lower PCA. See Diagram 6.9.
The voltage reading should be approximately 11 Vdc. If the reading is significantly low, or
significantly high, skip to step 18.
17. If the reading in step 18 was correct, the pedalling resistance should be correct, skip back to
step 15.
18. Disconnect the eddy current magnet wires from terminals M1 and M2 of the lower PCA.
Measure between the eddy current magnet wires with an ohmmeter. It should read
approximately 10 Ω.
C842, C842i, C846, C846i Upright and Recumbent Cycle
"B" Terminal
"S" Terminal
"E" Terminal
Page 34