I hate that Sensor
OHP Sensor may be out of alignment with the reflector in the Paper Feeder Frame Assembly, there may be a loose connection, or it may be faulty.
Open the Right Door Assembly and the OHP Sensor (with a blue tinted lens) is located on the machine side in the center below the registration roller and the ITB. Ensure that the sensor is correctly seated in the mounting frame and re-seat the harness to the sensor. If code will not clear replace the sensor. (RH7-7129-020)
to add on see picture
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from Canon ( blah,blah,blah)
E045 Error Codes can be difficult to troubleshoot-
Since the OHP sensor emits IR light it is not visible with the naked human eye. The signal that turns on the OHP Transmitter is momentary at initial rotation and difficult to read with a meter. If the code occurs at initial rotation you can not monitor the signal during copying when its on time is longer than at initial rotation.
Physically check the OHP Transmitter and be certain it is securely mounted to the machine.
To facilitate troubleshooting of the E045 Error Code a Digital Camera can be used to view the Infrared light (IR) the OHP Transmitter emits at initial rotation. Open the Right Door and interlock the door, locate the OHP Transmitter, turn on the Digital Camera and view the OHP Transmitter using the camera's LCD screen. Turn on the Main power switch of the imageRUNNER and as it goes into initial rotation you will be able to view the IR light using the cameras LCD screen ( you will not see the IR light if you view through the optical finder of the camera). If the light is present you most likely need to gently reposition the OHP Transmitter position. First gently pull the OHP mounting bracket toward you and then test with the right door closed. You may need to do this procedure several times.
If this fails to eliminate the E045 then gently position the OHP bracket away from you.
NOTE: you will not be able to see IR light with certain Digital Cameras, a simple check is to point a TV remote control device at your camera and view the LCD screen.
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