HP 8550 Service Manual - Page 282

Table 74. Jam detection Function Jam Type Pick-up Original retraction Sensor S1, S7 Pick-up Pick-up delay S7 Pick-up Registration S3, S7 delay Pick-up Pick-up Reversal Double S3 feeding Original S3 leading edge retreat Reversal S8 delay Reversal Reversal S8 stationary Reversal Reversal S8 delay 2 Reversal Reversal Reversal S8 initial paper Reversal S3 pick-up delay Reversal Delivery Reversal S3 pick-up stationary Delivery delay S6 Delivery Delivery S6 Stationery Delivery ADF open MS1 Description Code Sensor S7 does not detect the leading edge of an 01H original 1500 msec after the pick-up motor (M1) has turned on and, in addition, sensor S1 does not detect an original. Sensor S7 does not detect the leading edge of an 02H original 1500 msec after the pick-up motor (M1) has turned on. Sensor S3 does not detect the leading edge of an 03H original 350 msec after sensor S7 has detected the leading edge of an original. Sensor S3 remains on even when the first original is 06H placed on the copyboard. At the start of original pick-up, sensor S8 does not 08H detect the leading edge of an original. At time of original reversal or delivery, sensor S8 does 11H not detect the leading edge of an original 140 mm or 225 msec after the belt motor (M3) has started to rotate clockwise. At time of original reversal or delivery, sensor S8 does 12H not detect the trailing edge of an original after a reversal delay check. At time of original delivery pick up, sensor S8 does not 13H detect the preceding original 50 mm after the belt motor has started to rotate counterclockwise. (The original to be delivered is moved back to the copyboard glass together with the original picked up.) At time of original reversal, sensor S8 is on. 20H At time of original reversal, sensor S3 does not detect 21H the leading edge of the original that has been reversed 100 mm or 300 msec after sensor S8 has detected and original. Sensor S3 does not detect the trailing edge of an 23H original (original size + 180 mm) after sensor S8 has been turned on. At time of original delivery, sensor S6 does not detect 41H an original 100 mm or 250 msec after sensor S8 has detected the leading edge of an original. Sensor S6 does not detect the trailing edge of an 42H original 100 mm or 250 msec after a reversal stationary check. The ADF is open while in operation. 81H 280 Chapter - 5 Theory of operation EN