Fujitsu ULTIMA90 Maintenance Manual page 45

Installation
1. Remove the new ribbon cassette from its package. Push in the two
ribbon release tabs. The tabs snap into the cassette and the ribbon
feed mechanism engages.
2. Remove the ribbon guide (green part) from the ribbon cassette. Don't
turn the ribbon feed knob before installation.
R ibbon guide (green)
Figure 4.17 Ribbon cassette removal
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Operation panel