The maintenance guide says:
4,006.45: PC_DEV_FAULT_300DPI_CAL
Calibration failure: Target Volt-Sec Area of 300 dpi could not be achieved. Check the hardware. The printhead may need to be renormalized.
The maintenance guide says:
7,004.46:PM_FAULT_DM_CAM_SENSOR_BAD
No transitions are observed of the drum maintenance cam sensor. The sensor may be bad or the drum maintenance cam may be jammed.
Hope this helps.
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