Error code SC315 means "Potential Sensor Calibration Error 5" . Solution 1 (for errors SC312, SC313, SC314, SC315): If the drum unit is not correctly installed, SC312, SC313, SC314 or SC315 will occur. Install or replace it correctly Solution 2 : Try to turn the main switch off and on. Check the wires. Potential sensor is bad Potential sensor connector is bad or disconnected Potential sensor wires are disconnected Development power pack is bad IOB is bad OPC connector is bad
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