Brother International HL-2400C Service Manual - Page 269
Replace the IOD1 PCB.
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VIII-24 Error Code E3 Concerned Part Drum HP Sensor Is the belt cartridge properly installed ? YES Does the transfer drum rotate lightly ? YES Check the connector. Is DCN5 of IOD1 properly connected to the drum HP sensor ? Check the voltage: +5V-1 Is the voltage +5V between DCN5-1 and 3 ? NO Is the voltage +5V between DCN2-1 and 2 ? NO Replace the low voltage power supply (LVPS). NO Is E3 error cleared ? YES Finished. NO Re-install or replace the belt cartridge. NO Is the encoder plate deformed ? YES Is the rotation torque excessive ? Replace the transfer drum. NO NO Connect them properly Is E3 error cleared ? NO Is E3 error cleared ? YES YES Finished. YES Replace the drum HP sensor. YES Replace the IOD1 PCB. Is E3 error cleared ? NO Replace the MCTL PCB. MCTL 1LCN IOD1 45 HPSEN-N 45 DCN5 Drum PH Sensor (EN) Relay connector LVPS ACN1 DCN1 1 +5V-1 1 1 DCN2 2 HPSEN-N 2 2 3 SGND 3 3 +5V-1 1 SGND 2