Duplexing unit jam detection
The duplexing unit provides the following paper-detection sensors to detect paper presence and normal
paper-feed operation.
●
Duplexing feed sensor (SR2)
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Duplexing jam sensor (SR1)
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Top-of-page sensor (SR5 in the device)
The duplexing driver CPU determines whether or not a paper jam exists by checking if paper is present
at the sensor at the specified timing. The specified timing is stored in the CPU memory. If the CPU
determines that a jam has occurred, it stops the duplexing feed operation and notifies the formatter.
Table 4-4 Duplexing unit jam detection
Jam type Description Specified timing (approximate)
Reversing delay When SR2 does not detect paper within
the specified timing after SR6 detects the
media trailing edge, the CPU notifies the
formatter of a reversing delay jam.
T = 1.1 s
Duplexing delay When SR1 does not detect paper within
the specified timing after SR2 detects the
media leading edge, the CPU notifies the
formatter of a duplexing delay jam.
T = 1.5 s
Duplexing pickup delay When SR5 does not detect paper within
the specified timing after the duplexing
pickup operation begins, the CPU
notifies the formatter of a duplexing
pickup delay jam.
T = 3.3 s
Automatic delivery is available if either SR1 or SR2 detects paper before beginning the print operation.
ENWW Duplexing unit 137
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