IBM 3 User Manual page 23

Ribbon Guide
Ribbon Lift
Assembly
Figure 9. Installing Ribbon Cartridge
Figure 10. Aligning Ribbon Cartridge Pins
10. Turn the ribbon advance knob again in the direction of the arrow to take up
11. If the ribbon is not running freely, or to ensure that you have installed the
Ribbon Shield
Printhead
Cartridge
Supports
9. Align the ribbon mounting pins on the left and right side of the ribbon
cartridge with the slots in the cartridge supports. Snap the ribbon cartridge
down into place.
any slack in the ribbon, as you slide the printhead back and forth to ensure
that the ribbon guide runs freely along the ribbon.
ribbon cartridge correctly, check that:
Chapter 1. Getting Started
13