C4 Paper Feed Sensor paper jam error

Error code
  • 73 C4 Paper Feed Sensor paper jam error
Occurrence condition
  • The C4 Paper Feed Sensor detected paper when the power was turned ON, when the cover was closed, or when the product recovered from the power saving mode.
Assumed cause
  • Foreign objects or pieces of paper in the paper transport path
  • The C4 Paper Feed Sensor has a dirty surface, has fallen off, or is faulty
  • Mechanical control board failure
Related parts
  • C4 Pickup Unit (C4 Paper Feed Sensor)
  • Paper Feed Cover
  • Mechanical control board
Troubleshooting
Step Confirmation and action YES NO
1

Check paper transport path

Is there any foreign matter, paper chips, etc. in the paper transport path?

Remove any foreign objects or pieces of paper

Go to step 2
2

Check the operation of the C4 Paper Feed Sensor

Check the operation of the C4 Paper Feed Sensor with the diagnostic function.

Does the signal change between when the paper is placed and when it is not?

 End Go to step 3
3

Check the C4 Paper Feed Sensor for installation, dirt, and connector connection

Is the C4 Paper Feed Sensor installed improperly? Is there dirt on the sensor? Is the connector not fully inserted?

Is the relay connector for the C4 Pickup Unit not fully inserted?

 Clean the sensor surface, or fully insert the connector.

Replace sequentially

  • C4 Feed sensor
  • Mechanical control board