Ricoh Di-C1.5a Manual page 143

Drum
Development
Roller
One PCDU for each color.
The drum units are identical and can be interchanged. But the
development units cannot (they already contain developer).
Four colors are developed at the same time.
Slide 143
This shows the most important components of the PCDU.
The image transfer roller (not shown here) pulls the toner off the drum and onto
the transfer belt.
Overview
143
Di-C1.5 Training
Cleaning
Brush
Cleaning
Blade
Charge Roller