HP LaserJet 4 Service Manual - Page 123
Paper Jam Detection
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Table 5-5 Motors Motors M1 M2 M3 M4 M5 FM1 Description Main Motor (Gear Train Drive Motor) Paper Input Assembly Drive Motor 500-sheet Lower Cassette Pickup Motor Envelope Feeder Drive Motor Scanner Motor Exhaust Fan Motor Paper Jam Detection The Input/Registration Sensor (PS1) and the Paper Exit Sensor (PS3) detect paper moving through the printer. If a paper jam is detected, the DC Controller PCA immediately stops the printing process and 13 PAPER JAM or REMOVE PAPER JAM message is displayed. A paper jam can be detected under any of the following conditions: • Input Paper Delay Jam: When paper does not reach the Input Paper Sensor (PS1) within the required time. • Input Paper Stationary Jam: When paper does not clear the Input Paper Sensor (PS1) within a specified time. • Paper Exit Delay Jam: When paper does not reach the Paper Exit Sensor (PS3) within the required time. • Paper Exit Stationary Jam: When paper does not clear the Paper Exit Sensor (PS3) within a specified time. • False Paper Jam: If the Rear Door is open, a paper jam message is displayed because PS3 senses a jam. Note A defective PS5 (Paper End Sensor) can also cause a paper jam when paper is fed from the MP Tray (Tray 1). Functional Overview 5-11