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BTP-L42II User’s Manual
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Follow the steps below to clean the mark sensor:
A. Transmissive sensor
1) Turn off the printer and open the top cover;
2) Wipe off the dust and stains on the surface of the
transmissive sensor with alcohol cotton ball (it should be
wrung out);
3) Wait for 5 to 10 minutes until the alcohol evaporates
completely, and close top cover.
B. Reflective sensor
1) Turn off the printer and open the top cover;
2) Find the reflective sensor and take off the top cover board of
it;
3) Wipe off dust and stains on the surface of sensor with alcohol
cotton ball (it should be wrung out);
4) Wait for 5 to 10 minutes until the alcohol evaporates
completely, close the top cover board of the sensor, and
close the top cover.