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1st Transfer Section Main Unit Theory of Operation
2-44
II Composition/Operation
8.3.4 1st Transfer Roller pressure/retraction failure detection control
• The machine monitors the state of the Retraction Position Sensor/1st Image Transfer
(PC9) for detection of failures.
A. Detection of failure during pressure operation
• If the Retraction Position Sensor/1st Image Transfer (PC9) is not blocked within a prede-
termined period of time after the Pressure/Retraction Clutch/1st Image Transfer (CL4)
has been energized, the machine determines that there is an Intermediate Transfer Belt
pressure failure.
B. Detection of failure during retraction operation
• If the Retraction Position Sensor/1st Image Transfer (PC9) is not unblocked within a pre-
determined period of time after the Pressure/Retraction Clutch/1st Image Transfer (CL4)
has been energized, the machine determines that there is an Intermediate Transfer Belt
retraction failure.
C. Detection of pressure/retraction failure during a print cycle
• A media misfeed in control logic results if there is a condition developing in which a pres-
sure/retraction sequence is not carried out at correct timing during the 1st transfer
sequence.
• A pressure/retraction sequence is not completed at timing, at which printing starts in the
sub scan direction.
D. 1st transfer control provided when a malfunction occurs
• If a media misfeed or malfunction is detected with a toner image left on any one of the Y,
M, C, and K Photo Conductors, the toner image on the Photo Conductor is first trans-
ferred onto the Transfer Belt and then the subsequent procedures are performed.
1. It is determined that the machine stops in mid-printing operation due to a media mis-
feed or malfunction.
2. The output of each laser diode is shut down so as not to form an electrostatic latent
image on the surface of the Photo Conductor.
3. The developing bias output for each color is shut down so as not to allow development
to take place.
4. The Transfer Belt is driven for the distance between exposure and transfer, thereby
transferring the toner image on the surface of the Photo Conductor onto the Transfer
Belt. Drive of the Transfer Belt is then stopped.
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