HP 8550 Service Manual - Page 531
Numbered error codes, mounted on the spindle of the pick-up motor M1, and the rotation
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Note Numbered error codes If the table indicates replacement of a part, exchange the entire ADF. E401 This error indicates that either the pick-up motor (M1) does not rotate or the pick-up roller sensor (S5) is faulty. In normal operation, a flag is mounted on the spindle of the pick-up motor (M1), and the rotation of the pick-up motor is mounted in reference to the flag blocking the pick-up roller sensor (S5). This error appears when the sensor does not turn on and off two times or more per second. Cause Pick-up roller sensor (S5) Step 1 Pick-up motor 2 (M1) Checks Yes/No Action Set the meter range to 20 V dc, NO and connect the + probe to J5-1 and the - probe to J5-2 on the DADF controller PCB. Turn the flag (light-blocking plate) on the pick-up roller shaft by hand. Is the voltage about 5 V when the flag is at the sensor and 0.15 V when the flag is not at the sensor? Set the meter range to 200V dc, and connect the + probe to J12-1 and the - probe to J12-2 on the DADF controller PCB. Does the reading change to 22 V when the Copy Start key is pressed? YES NO Check the wiring from the pickup motor (M1) to the DADF controller PCB. If normal, replace the pick-up motor. Replace the DADF controller PCB. EN ADF troubleshooting 529