FEIN - Repair - Tools
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MVK
04 / 08
3.3. Major function control 2
Malfunction
Possible Causes
Test Possibilities
3.2.2
Motor switches off “for
no reason“.
Loose contact (loose contact in mains
feedline leads to the initiation of the self-
start lock, for example).
Electronics defective.
Test continuity.
See above.
3.2.3
Speed varies.
Machine too weak,
regular behaviour not
noticeable.
Electronics defective.
Additional mechanical loading (drive,
bearing, vibrations, ...)
collector, carbon brushes defective.
Electronics defective.
See above.
Check.
Visual check of brush sparking.
Measure motor voltage. Voltage
must rise when the machine is
loaded.
3.2.4
Motor starts if the
machine is switched
on and plugged into
the mains.
Electronics defective.
No further check necessary.
