Oki RT322POS - Manual (Page 18)

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3-7-2. Removing the Paper Roll Holder
When using a paper roll with an 79.5 mm width, install the paper roll holder into the groover
as shown. And change the setting at memory switch #4. For instructions on setting the memory
switch, refer to the separate Programmer's Technical Reference manual.
Note: After using a paper roll with a width of 79.5 mm, do not change to a paper roll with
a width of 115.5 mm. This is because the printer head has deteriorated as a result of
a portion of the head having been in direct contact with the rubber roller.
Paper roll holder