Olivetti ECR 2500 Euro Instruction Manual page 17

2. Remove the old ink cartridge by pulling the plastic tab on the front
of the cartridge towards you while rotating the cartridge.
3. Extract the inked ribbon cartridge from its sealed package and
slightly turn the ribbon tension knob on the front of the cartridge
clockwise (in the direction of the arrows on the cartridge) to tighten
the ribbon properly.
4. Holding the cartridge by its front plastic tab, place the lower edge of
the cartridge on the printer assembly's cartridge support base and
then snap the cartridge into place by rotating it forward while
pressing downward. Note that the inked ribbon must slide into its
related slit in front of the print mechanism.
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5. Slightly turn the ribbon tension knob on the cartridge clockwise (in
the direction of the arrows on the cartridge) to ensure that the
ribbon is properly taut.
6. Reposition the printer compartment cover by firstly inserting its rear
snap features into the related slots on the case and then gently
tilting the front part of the cover downward so the side and front
snap features slip perfectly into their respective slots. When doing
so, remember to ease the customer receipt through the customer
receipt output slot on the cover so that it can then be fed outside the
machine. Lock the compartment cover once positioned.