Ricoh D109 Service Training page 40

Shipped state
Slide 40
New PCU Detection
The machine automatically detects a new PCU at these times:
At time of copier installation
When a replacement PCU is installed
A new PCU must be initialized before it can be used. These also must be done:
Agitate toner/developer mix.
Initialize the TD sensor.
Initialize the PCU counter.
The machine automatically detects a new PCU and performs initialization. In the
shipped state, the connection plates are pressed together and make a complete circuit.
This tells the CPU that the PCU is new and must be initialized. When the PCU gear
rotates, the top connection plate gets free and breaks the circuit.
Pre-installed PCUs do not use this mechanism. A factory-set flag tells a new machine
to initialize the PCU when the machine is switched on for the first time.
New PCU Detection
PCU gear
40
Plate
S-C4L Training