Systematic Electrical Troubleshooting - Stairmaster MOMENTUM C40 Owner's Manual

SYSTEMATIC ELECTRICAL TROUBLESHOOTING

okay to use the machine with the battery charger connected. After 48
hours, repeat step 3 - 4. If the voltage measured is below 6.0 VDC then
the battery is bad.
5. Plug the battery connector back into the power control board.
6. Test the main cable. Remove the four console knobs from the console.
Gently lift the console up and disconnect the main cable from the back
of the console. Have an assistant pedal the bike and while you test pins
1 and 10 of the main cable at the console connection for a minimum of
6.0 VDC.
7. Reconnect the main cable to the console.
8. Verify that the inductive switch is adjusted to within 1/32" (0.8 cm) of
the speed sensor disk on the front of the alternator.
9. Test the inductive switch. Unplug the inductive switch cable from the
power control board and test pins 1 and 2 for AC voltage while pedal-
ing. VAC should increase with RPM.
10. Test the inductive switch PCB point. Plug the inductive switch back in.
Use a voltmeter to verify that the AC voltage at yellow test points 10
and 12 of the PCB increases when RPM's increase (test point 10 is
positive, test point 12 is negative).
11. Test the alternator. Unplug the alternator wiring connector from the
PCB.
12. Connect alligator clips between the B+ terminal and the FLD terminal
of the alternator.
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