Toner container sealing/release holder shift cam HPsensor timeout (Bk) errorDescriptionof detectionHP sensor of release holder shift cam cannot detectwithin specified period of time.Measures 1. Check the connection of the toner container drivemotor (M7) harness. (Check whether the wire is notcaught by parts.) Check the connection with the DCcontroller PCB.Motor side: J7103, J8040 PCB side: J12482. Check the connection between the release holder shiftcam HP sensor (PS8) and the DC controller PCB.Sensor side: J7135, J8040 PCB side: J12483. Clean and replace the toner feed screw rotationsensor.4. Replace the hopper/stirring supply motor.5. Replace the hopper unit.CAUTION:As for Remedy 5, since it is difficult to identify the cause,it is recommended to replace the unit.NOTE:After performing the above remedy work, go throughthe following to clear the error: COPIER> FUNCTION>