HP 8550 Service Manual - Page 533
fewer than the specified value., when the number of delivery motor clock pulses per 200 msec is
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E404 This error indicates that either the delivery motor (M5) does not rotate, or the delivery motor sensor (S13) is faulty. This error occurs when the number of delivery motor clock pulses per 200 msec is fewer than the specified value. Cause Delivery motor clock sensor (S13) Step 1 Delivery motor 2 (M5) Checks Yes/No Action Set the meter range to 20 V dc, NO and connect the - probe to J14-1 on the DADF controller PCB. Does the reading jump between 0 V and 5V when the clock disk is turned slowly by hand? Check the wiring from the delivery motor clock sensor (S13) to the DADF controller PCB. If normal, replace the belt motor clock sensor (S13). Set the meter range to 200 V dc, and connect the + probe to J14-8 and the - probe to J14-7 on the DADF controller PCB. Does the reading change to 23 V when the Copy Start key is pressed? YES NO Check the wiring from the delivery motor (M5) to the DADF controller PCB. If normal, replace the delivery motor (M5). Replace the DADF controller PCB. E411 This error indicates that either the document tray paper sensor (S1) or the registration sensor (S3) is faulty. This error occurs when the output of the sensor is 2.3 V or higher when there is no paper in the document tray. Cause Document tray paper sensor (S1) Registration sensor (S3) Step 1 2 Document tray 3 paper sensor (S1) Registration sensor (lightreceiving) (LED3) Checks Yes/No Action Adjust the levels of the document YES tray paper sensor and the registration sensor. is the problem corrected? Adjust the levels of every sensor. Is the light-receiving section of YES each sensor soiled with paper lint. Clean the light-receiving side of the sensor with a cotton swab. For the document tray paper NO sensor, measure the voltage between connectors J5-7 and J5-9 of the DADF controller PCB. For the registration sensor on the light-receiving side, measure the voltage between connectors J9- B10 and J9-B9 of the DADF controller PCB. Is the voltage between 0.6 V and 1.1 V? Check the wiring. If normal, replace the document tray paper sensor (S1) or the registration (light-receiving) sensor (LED3). EN ADF troubleshooting 531