PHOTOCONDUCTOR UNIT (PCU)
1 October, 1999
2-6
2.2.3 NEW PCU DETECTION MECHANINSM
When the PCU counter reaches 60K, the “Replace PCU” message is displayed.
The new PCU detect switch [A] detects when a new PCU is installed. Each PCU
has an actuator [B]. When a new PCU is installed in the machine, the actuator [B]
pushes the new PCU detect switch. The actuator is a sector gear, and this gear
engages with the drum gear [C]. When the drum rotates, the actuator is released
from the drum gear. The actuator drops away from the new PCU detect switch and
remains in this "down" position for the duration of the PCU's life.
The machine can recognize when a new PCU has been installed in the machine
because the actuator of the new PCU comes in contact with the new PCU detect
switch. Then, the machine automatically resets the PCU counter.
After the front cover and right cover are closed, the machine then performs the TD
sensor initial setting procedure automatically (for about 45 seconds). During this
time, the drum rotates and the actuator drops away from the sensor.
While the machine performs the TD sensor initial setting, the machine makes an ID
sensor pattern on the drum. This checks whether the developer has fallen into the
development unit (in other words, it checks whether the user or technician
remembered to remove the developer seal from the PCU at machine installation). If
the machine does not detect the ID sensor pattern, SC 392 is generated.
NOTE: The PCU counter can be cleared by the printer engine service mode
(Service Menu 2: PCU Count clr).
G038D206.WMF
[A]
[B]
[C]
