HP 2300d Service Manual - Page 108
Jam detection, Pickup sensors
UPC - 808736471091
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Jam detection The following mechanisms detect the presence of media and paper-feed conditions: q top-of-page sensor (PS2305) q delivery sensor (PS2301) q reversed-paper sensor (PS501) q automatic duplexer pickup paper sensor (PS503) The CPU detects a jam by checking for the presence of media through sensors against the timing stored in the CPU. If the CPU determines a jam, it stops the print operation and notifies the formatter of a jam. Pickup sensors Pickup delay jam This printer performs retry control to readdress any pickup delay jam that the pickup error causes. Pickup operation is conducted a maximum of twice at all pickup sources except for the automatic duplex feed unit. If the top-of-page sensor (PS2305) cannot detect the media leading edge within a specified period of time (T) the printer performs the pickup operation again. If PS2305 cannot detect the media leading edge within the specified period of time (T), a jam is indicated. q paper pickup from the tray1: T = approximately 2.5 seconds q paper pickup from the cassette: T = approximately 3.0 seconds q paper pickup from the paper feeder: T = approximately 4.4 seconds q paper pickup from the automatic duplexer feed unit: T = approximately 4.5 seconds Pickup stationary jam A. When the WAIT period starts-a pickup stationary jam is assessed if the top-of-page sensor detects media when the WAIT period starts. B. During media feeding-a pickup stationary jam is assessed if the top-of-page sensor (PS2305) does not detect the trailing edge of the media within 3.8 seconds after detecting the leading edge. 106 Theory of operation ENWW