Removing The Ribbon Cartridge; Inserting The Ribbon Cartridge - Olivetti PR2 E Service Manual

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Push the ribbon guide downwards until it releases from the print carriage.
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Remove the old cartridge by pulling it outwards.
Fig 3-1 7 Removing the Ribbon Cartridge
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Insert the cartridge into the feed gears, hooking it on the two sides and making sure to insert pin (1)
into the related hole of the ribbon feed knob.
Fig. 3-18 Inserting the Ribbon Cartridge