EFX 885, 835, 825
Service Manual 20039-166
Page 135
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Troubleshooting 9.2 Troubleshooting the Generator
The generator performs three functions in the EFX. First, by controlling the amount of electrical load applied to the
battery. Lastly, one of the generators six phase output windings is monitored to determine when the unit is in use and
when it is idle. This system also determines the stride rate by determining the operating speed (output frequency) of the
monitored generator winding.
Warning
Because this is a self powered unit, it will either be necessary to either equip the unit with the optional external power
supply or have an assistant pedal on the unit while voltage measurements are being taken. Because of the danger of
working on the unit while it is in motion using the optional external power supply is strongly recommended.
1.
Perform the generator resistance test per Procedure 8.1. If any of the resistance measurements are significantly
high or significantly low, replace the generator.
2.
The following voltage reading must be taken while the unit is in motion. Extreme care must be taken to keep
meter leads, hands, etc. clear of all moving parts. Using an AC voltmeter, measure the voltage between 1 & 3, 2
at the time the measurement is taken. At a stride rate of 100 strides per minute, all three voltage readings will
be approximately 100 VAC -110 VAC.
3.
If any of the six readings in step 2 are significantly low, replace the generator.
4.
If you have performed all of the above tests and are unable to resolve the problem, contact Precor customer
support.
Summary of Contents for EFX 825
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