Sharp ER-A770 Instruction Manual page 69

3. Replacement of the ink ribbon cassette
When the print becomes faint, replace the ink ribbon cassette with a new one according to the
procedures described below.
Be sure to turn off the remote printer before replacing the ink ribbon cassette.
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6.
Take up the slack in the paper and set the roll in
position.
7.
Close the paper cover.
1.
Remove the paper cover and the ribbon cover.