PHOTOCONDUCTOR UNIT
17 January, 2003
6-40
6.4.8 PCU DETECTION (DEVELOPMENT UNIT DETECTION)
Detection Pins
The drum positioning plate [A] contains eight push switches [B]. These detect when
a new PCU or a new development unit has just been installed. They also detect if
the PCUs and development units are in the machine.
Each PCU and each development unit includes a pin [C], which activates the
switch when the drum positioning plate is closed. On a new unit, this pin does not
activate the switch. When the unit is driven for the first time, the pin comes out and
activates the switch.
Detection Process
After the machine is turned on or the front cover is closed, the machine checks
each switch (“Result 1” in the table). Then the machine drives the PCUs and
development units for 5 seconds and checks each switch again (“Result 2” in the
table). The condition detected by the machine depends on the combination of
results as shown in the table.
Result 1
Result 2
Detection
Action
OFF OFF
The PCU or development unit is
not placed in the machine, or the
drum positioning plate is not
secured by the two screws.
The machine displays an error
message.
OFF ON
A new PCU or development unit
has just been installed.
The machine resets the
counter for the PCU or
development unit.
ON ON
The current PCU or
development unit is present.
The machine goes to the
standby mode.
G080D952.WMF
[A]
[B]
[C]