Sony UP-2100 Operating Instructions Manual page 9

Note
Never put your hand into the ink ribbon compartment. The thermal head
becomes very hot. You may burn yourself if you touch it.
When the ink ribbon cartridge cannot be ejected
Turn the power off, then back on again. Then, after a while, press the ink ribbon
cartridge.
In this case, the image in memory will be lost.
3
Remove any slack from the ink ribbon.
If the ribbon is left slack, it may be damaged when inserted.
Wind the spool until
the not-used part
comes to the right end.
4
Insert the ink ribbon cartridge firmly until it stops.
When the ink ribbon cartridge cannot be inserted
Turn the power off, then back on gain. Then, insert the ink ribbon cartridge.
5
Close the front panel.
9
Operation