Maier MHI-6220, Instruction Manual

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2. Maintenance of the Negative Ion-Producing Electrodes (Needlepoints)
Every 2-3 months, or if the unit begins making noise, the dust and particulate should be
wiped off from the ends of each of the needlepoints inside the front grill of the unit. First,
make sure that the unit is unplugged. Next, remove the collector plate (see the photo above).
Now, the needlepoints will be accessible through the opening left by the removal of the
collector plate. To clean the needlepoints, either wipe off the dust with cloth, or a cotton swab
(like Q-tip) dipped in rubbing alcohol.
3. Cleaning the front grill
If the front grill has collected enough dust, the unit can generate sparks. The situation like
this arises when Negative Ions generated by the needlepoints gets blocked by the dust
collected on the front grill. To avoid this kind of situation, make sure the front grill has no
visible sign of dust particles. If there is dust, then use a cleaning brush or a vacuum cleaner
and remove the dust.