Canon imagePRESS C800 Series Troubleshooting Manual page 186

Chapter 1
8) Use a dedicated tool [1] to deactivate the Front Door Switch.
9) Turn ON the main power switch and then immediately disable (turn OFF) the warm-up rotation.
Service Mode > COPIER > Function > INSTALL > AINR-OFF (ON/OFF of warm-up rotation deactivation) > "1"
10) Execute the Potential Sensor adjustment.
Service Mode > COPIER > Function > DPC > OFST (Adjustment Potential Control PCB detect potential)
11) Enable (Turn ON) the warm-up rotation.
Service Mode > COPIER > Function > INSTALL > AINR-OFF (ON/OFF of warm-up rotation deactivation) > "0"
12) Turn OFF the main power switch.
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