HP 8550 Service Manual - Page 503
E054 printer, The duplexing feeding roller 1 home position sensor PS23 does
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Note E054 (printer) This error pertains to the duplexing unit, which is an accessory. The duplexing feeding roller 1 home position sensor (PS23) does not detect the home position of the duplexing feeding roller 1 when copy paper is being fed to the duplexing unit. Cause Step Duplexing 1 feeding roller 1 home position sensor lever Duplexing 2 feeding roller drive gear Duplexing driver 3 PCB Duplexing 4 feeding roller 1 home position sensor (PS23) Duplexing 5 feeding clutch (CL5) Duplexing motor 6 (M8) Duplexing driver PCB Checks Is the duplexing feeding roller 1 home position sensor level damaged? Y/N YES Is the drive gear of the duplexing YES feeding roller worn or cracked? Are connectors J2003, J2004, and NO J2007 on the duplexing driver PCB connected securely? Replace the duplexing feeding roller 1 home position sensor. Is the problem corrected? YES Disconnect connector J2003 of the duplexing feeding clutch, and measure the resistance between connectors J2003-1 and J2003-2 on the harness side. Is it about 140Ω? Replace the duplexing motor. Is the problem corrected? NO YES NO Action Replace the lever. Replace the worn or cracking gear. Connect the connectors securely. Replace the sensor. Replace the duplexing feeding clutch. Replace the duplexing motor (M8). Replace the duplexing driver PCB. EN Copy module troubleshooting 501