Brother International HL-2400C Service Manual - Page 261
Is the connection between ECN17 of IOD2 and Clutch DCLY OK ?
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Error Code Name of Part D1 Developer Clutch (DCLY) Check the Connector. Is the connection between ECN17 of IOD2 and Clutch (DCLY) OK ? NO Is the harness of Clutch (DCLY) broken ? YES Connect the harness. Connect the connector properly. Is D1 Error cleared ? YES NO Finished VIII-16 Check the voltage at DCLY ON-N. Does the voltage drop( Does the voltage jump( +24V)between ECN17-3 and ECN2-8? YES NO )between ECN1-1 and ECN2-12 ? YES NO Replace current MCTL PCB with a new one. Is D1 Error cleared ? NO YES Finished Replace the clutch (DCLY) with a new one. Replace IOD2 PCB with a new one. Is D1 Error cleared ? YES NO Finished Re-check from beginning of section. MCTL IOD2 12CN ECN1 ECN17 1 DCL(Y)ON-P 1 1 3 +24V-1 Developer Clutch(Y) DCL(Y)ON-P DCLY ECN2 +24V-1 5 PGND 8 SGND 12