A&D 191 - Manual (Page 11)

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If your printer is used infrequently, the print impression
may become weak because the ribbon has dried out. To
advance the ribbon to a new section, hold down the
Paper Feed switch for several seconds.
Below are the steps for replacing the ribbon:
1. Turn the printer offline.
2. Four small grooves are embossed on each side of
the printer cover. Push down on one or both of these
areas until the printer cover tilts.
3. When the printer cover is tilted up, lift it completely
off.
4. Push down on the right side of ribbon cartridge
where it is marked “PUSH”. Remove the cartridge.
Changing the P Changing the P Changing the P Changing the P Changing the Printer rinter rinter rinter rinter
Ribbon Ribbon Ribbon Ribbon Ribbon