Brother International HL-2400C Service Manual - Page 264
Is the connection between ECN13 of IOD2 and Clutch DCLK OK ?
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Error Code Name of Part D4 Developer Clutch (DCLK) Check the Connector. Is the connection between ECN13 of IOD2 and Clutch (DCLK) OK ? NO Is the harness of Clutch (DCLK) broken ? YES Connect the harness. Connect the connector properly. Is D4 Error cleared ? YES NO Finished VIII-19 Check the voltage at DCLK ON-N. Does the voltage drop( Does the voltage jump( +24V)between ECN13-3 and ECN2-8? YES NO )between ECN1-4 and ECN2-12 ? YES NO Replace current MCTL PCB with a new one. Is D4 Error cleared ? NO YES Finished Replace the clutch (DCLK) with a new clutch. Replace IOD2 PCB with a new one. Is D4 Error cleared ? YES NO Finished Re-check from beginning of section. MCTL IOD2 12CN ECN1 ECN13 4 DCL(Y)ON-P 4 +24V-1 1 DCL(Y)ON-P 3 ECN2 +24V-1 5 PGND 8 SGND 12 DCLY