SATO S84-ex Operator's Manual page 292

7 Maintenance
5
Turn the head lock lever 
counterclockwise to lock the print head.
6
Using two hands, pull the cleaning
sheet away from the product.
7
After you pull out the cleaning sheet,
repeat steps 4 through 6, two or three
more times.
When no more dirt appears on the cleaning sheet
after you have pulled it out, stop repeating these
steps.
8
Turn the head lock lever  clockwise to
unlock the print head.
9
Use a cotton swab/cloth dabbed with
cleaning liquid to clean the dirt on the
print head .
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