Canon IR2200, IR3300, IR2800 manual Checking the Photointerrupters, Paper Sensor, Open/Closed Sensor

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

6.1.2 Checking the Photointerrupters

The photointerrupters are checked in service mode; go through the tables attached to the lists of electrical components to find out the state* of a specific sensor, which may be any of the following:

a. Paper Sensor

Move the sensor lever by hand to simulate the presence of paper; then, check the Service Mode screen.

If it is difficult to check the Service Mode screen while moving the sensor lever, put paper over the point of detection, and then check the Service Mode screen.

b. Open/Closed Sensor

Check the Service Mode screen while opening/closing the cover/unit in question.

c. Position Sensor, Presence/Absence Sensor

Move the unit in question by hand. Try removing and then mounting it. If the I/O level changes in response to operation, the sensor may be assumed to be normal.

To check a photointerrupter found inside a unit which is detached in con- junction with a drawer connector, be sure to check the Service Mode while the unit in question is set.

*The state of a sensor refers to any of the following:

•For a paper sensor, the presence or the absence of paper.

•For an open/closed sensor, the state in which the cover/unit is closed.

•For a home position sensor or a set sensor, the item in question is in home position or set in place.

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 4-47 T