Pcu - Ricoh K-C3.5L Service Training

Practice replacing PCU components.
Slide 48
More on Lab Work

PCU

When a new PCU is installed, new developer must also be installed and SP
2214 must be done to reinitialize the TD sensor.
There is no new PCU detection in this machine. This is because the user does
not replace the PCU.
Developer
Before adding new developer, note that you must tap the top of the PCU at
several locations, as described in step 2 of the procedure.
This is to remove recycled toner from the toner collection coil. If this toner is
not removed, it may fall into the new developer while the technician is
reassembling the machine. Then there will be too much toner in the
developer, and this will cause toner spots on copies.
This toner may drop into the developer when replacing other parts of the
mechanism, but there is no point in tapping the coil because we are not
going to remove the old developer. So, to remove the excess toner, the
technician has to make skyshot copies after replacing any PCU
components, as explained in step 7 of the 'After Replacement or
Adjustment' section.
These skyshot copies are not necessary after replacing developer,
because the coil was tapped to remove the toner before adding new
developer.
Step 1 of the procedure says make 5 copies. These are test copies to
check whether we have a problem with excess toner causing spots on
copies.
Note that in step 6, we open and close the cover. This is to activate the cover
sensor and trigger the toner supply coil rotation to dislodge toner blockages in
the coil.
If new developer is added without changing the PCU, SP 2214 must also be
done.
Also, after adding a new PCU, new developer must be added, so developer
Lab Work
FSM Replacement and Adjustment
Be sure to do the After Replacement or Adjustment
when you are finished practicing. (Also, see the notes section
below.)
Pay attention to all notes, cautions, and warnings in the
manual.
PCU Section
48
Model K-C3.5L
procedure