Possible Area Z jam codes not caused by sensor in duplex unit:J001 jam found at power on (jam was nor cleared on closing jam door, sensor covered or bad at power up or door closed, door switch bad following a jams (machine thinks door has not been opened.)
J009 paper has reached lower duplex sensor (exit sensor) but has not reached the registration sensor. Normally a mechanical jam or foreign material jam at the duplex roller.
There are also 6 jam codes within the duplex unit. 4 are detected by the entrance sensor, upper sensor. Lead edge and trail edge entering the duplex unit and lead and trail edge exiting the inverter. The other 2 are detected at the duplex exit sensor. Lead edge and exit edge.
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