is an error detection to the fixing inlet home position sensor.
PS63 (Fixing Inlet sensor) and PS66 (Fixing Inlet HP sensor)
may be caused by a poor connection on the front door switch. Try inspecting & re-seating the connection at the front door open/close switch=
++ make sure the front door is not vibrating away from the front door open/close switch (MSW7).
The door Magnet Action Catch may not properly be holding the door closed.
++ if paper is stuck in unit 1 frame side connector you might get a E840
. If no paper is found in the connector check the connector for damage or cracks. Frame side connector assembly (FM2-5091-000).