A SERVICE OF

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The shaft rotates in
air bearings, but not
freely, in this case
air pressure is
normal.
- Air ventilation hole
(AO) of spindle is
closed by dirt, or
sealed, or used small
inlet pipe to air out, or
this pipe is damaged.
- Air ventilation hole (Air
out) of brushes sensor
(BV) is closed by dirt,
or sealed, or used
small inlet pipe to air
out, or this pipe is
damaged.
- Check spindle’s air outlet
- Check brushes ventilation
Contact resistance
of the sensor more
than 10 K
- Brushes are too short
- Electrical connections
problem
- Replace the brushes
- Check electrical connections
Short circuit
between the
brushes
- There is conductive
Carbon powder in the
contact area of the
brushes
- Short circuit in brushes
cable
- Clean the brushes area.
- Check brushes ventilation
- Check the brushes cable
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