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SECTION 4: CLEANING AND MAINTENANCE
SATO D508/D512 Operator Manual Page 4-5
4.4 CLEANING THE SENSOR
The gap sensor is used to control the positioning of the label. It is a transmissive see-thru sensor
that detects the edge of the label by looking through the backing paper which is translucent and
detecting the presence of the opaque label.
So when dust, dirt or other foreign matter interferes with the light path of the sensor, erratic label
positioning occurs. The sensor should thus be cleaned regularly, after every two rolls of labels.
1. Turn the printer OFF and remove the power cable.
2. Open the Top Cover.
3. Locate the sensor located next to the yellow screw-
driver, near the left-hand side label guide so that it
moves whenever the Label Guide are adjusted for dif-
ferent media widths.
4. Apply Thermal Print Head Cleaner to a cotton swab.
5. Use the cotton swab to clean any foreign matter from
the exposed surface of the sensor by inserting the cot-
ton tip in the paper slot and briskly cleaning it with a
back and forth motion.