Ricoh Di-C1 Manual page 105

New Unit Detection Mechanisms
PCDU, Development Unit
The development unit (as part of the PCDU, or as
a separate development unit) contains an ID chip.
The ID chip contains information that tells the
machine that the unit is new.
PCDU Toner Collection Bottle
The machine uses the 'bottle full sensor' to
determine if the bottle was replaced.
This only works if the bottle is in a 'full' or 'near-
full' condition.
Slide 105
The ID chip in the development unit contains all the counters for the PCDU
(drum unit counters, development unit counters).
If we replace the development unit as a separate unit, the new ID chip does
not contain the drum counters for the drum unit that is still in the machine.
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Di-C1 Training