MUTOH ValueJet VJ-1638UR Operation Manual page 32

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32 Loading Roll Media into the printer
Rewind the roll media a little by rolling Flange on Roll media holder
while holding the edge of the media, and eliminate any slack or slant.
Note
If you set the roll media free while rewinding, the roll media may fall out from Media
feed slot and fall toward the back of the printer.
Confirm that the right edge of the roll media does not go beyond the
loading mark. If it does, it may affect print quality.