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34 ST/SV-3210 and ST/SV-3306
4.4.3 TOF Sensor Cleaning
If the TOF Sensor becomes blocked with paper particles, Top of Form
detection can be inconsistent or fail completely. To clean the sensor:
n Turn ‘Off’ and unplug the printer.
o ST Models: Raise the access cover; see Section 3.2.
p Slide the printhead latch to the unlocked position, raise the Printhead
Assembly (see Section 4.4.1) and remove the ticket stock.
q Using a soft brush or compressed air, remove any debris
accumulated on the TOF Sensor. (If necessary, an isopropyl alcohol
dampened cotton swab can be used to remove build-up.)
r If necessary allow the sensor to dry, then lower the Printhead
Assembly and slide the printhead latch into the locked position.
s Plug in and turn ‘On’ the printer.
t Load ticket stock (see Section 3.2).
u ST Models: Close the access cover.