Canon iR4570 Series Service Manual page 766

Code Cause
E191 There is an error in the communication with the high-voltage power supply.
0000 The data transmission/reception does not
end normally 500 msec after the most
recent transmission/reception of data
ended normally.
E202 There is an error in the detection of the CIS home position.
0001 The attempt to detect the home position
fails when the CIS is moved forward.
0002 The attempt to detect the home position
fails when the CIS is moved back.
E225 The light intensity of the CIS is faulty.
0001 During shading operation, the intensity is
below a specific level.
0002 During DF stream reading, the sheet-to-
sheet light intensity is faulty.
E227 The reader unit power supply is faulty.
0001 At time of power-on, the 24-V port is off.
0002 At the start of a job, the 24-V port is off.
0003 At the end of a job, the 24-V port is off.
0004 When a load is being driven, the 24-V
port is off.
E248 The backup memory is faulty.
Remedy
Replace the high-voltage power supply.
Replace the DC controller PCB.
Disconnect and then connect the harness
connector. Replace the following as
necessary: scanner home position sensor,
scanner motor, reader controller PCB.
Disconnect and then connect the harness
connector. Replace the following as
necessary: scanner home position sensor,
scanner motor, reader controller PCB.
Disconnect and then connect the flexible
cable. Replace the following as necessary:
flexible cable, CIS, reader controller PCB.
Disconnect and then connect the flexible
cable. Replace the following as necessary:
flexible cable, CIS, reader controller PCB.
Disconnect and then connect the power
supply harness connector. Replace the
power supply.
Disconnect and then connect the power
supply harness connector. Replace the
power supply.
Disconnect and then connect the power
supply harness connector. Replace the
power supply.
Disconnect and then connect the power
supply harness. Replace the power supply.