HP 8550 Service Manual - Page 285

Table 76. Improper placement detection Fault Sensor Description ADF operation Code Recirculation lever S11 idle rotation Immediately after the Stops operation immediately 01H recirculation motor M4 starts upon detection. to operate, the recirculating lever rotates idly without coming into contact with an original. Pick-up failure S7 Sensor S7 does not detect the The separation belt, feeding 03H leading edge of an original roller, and pick-up roller stop 1500 msec after the start of operation immediately. The pickup. original moving in advance is delivered after the end of copying; then, the ADF stops operation. Paper stopper plate S7 overriding At time of placement of Stops operation immediately 05H originals, the originals ride upon detection. over the paper stopper plate. Count mismatch S3 The number of originals Stops operation immediately 11H placed on the document tray upon detection. after jam removal is fewer than the number of originals copied. Original count S3 The recirculating lever does Stops operation after counting 12H not fall under the document 100 sheets. tray, not enabling detection of the last original. Note: Normally, the document tray can hold as many as 50 sheets of A5, STMT, A4, B5, or LTR or 25 sheets of A3, B4, 11-by-17 inch, or LGL. Original extraction S14 The recirculating lever fell Stops operation immediately 13H under the document tray while upon detection. an original was being processed. Wrong original size S3 The original that is picked up is Stops operation immediately 14H a non-standard size. upon detection. Wrong original size or S3 size mix in reduced page composition mode 1. The original that is picked Stop detection immediately 15H up is of a type not supported upon detection. by reduced page composition mode, or 2. The original that is picked up is of a size different from the size of the first original. EN ADF 283