![background image](http://html1.mh-extra.com/html/formax/6404-series/6404-series_operators-manual_2320050100.webp)
Clean the sensors on the envelope or document path
When the display warns about dusty sensors in the envelope or document path, clean them
as follows:
1.
Open side cover A.
2.
Place bellows B in the upper air plug C and firmly squeeze a few times to blow the
dust from the document path sensor.
3.
Place the bellows in the lower air plug and firmly squeeze a few times to blow the
dust from the envelope path sensor.
4.
Calibrate the photocells (see
Resetting photocells
on page 93).
Clean the exit sensors
To clean the exit sensors:
1.
Rotate a slightly moistened cotton swab in the lower hole, to clean the lower exit
sensor.
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