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E045 is the HP sensor error located inside the right door. It maybe dirty or dislodged. Clean or replace. No special reset, just OFF/ON.
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)
with such error displayed press the print button, the machine shows another sub code, if it is 11 or 12 means a trouble with the scanner section. to fix take out the glass ,clean the white strip left, the lamp reflector and mirrors, open the lens cover (5) screws, clean the lens and CCD. if the subcode is 16 a trouble with laser
9 out of 10 times this is caused by dirty contacts. It can also be caused by some electrical charge getting to the paper as it goes through the printer or a faulty (weak) power supply board. Your first check should be to remove all of the consumables and clean all metal contacts with an alcohol wipe or similar. Hope this helps.
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Look at cleaning the glass panel over the laser lens. It is quite likely that toner, dust or other muck has fallen onto the lens.
The other item to replace is the PCU/Drum unit as there may be damage on it. Clean the lens first though.