Figure 5-31 Duplex printing control
Duplex printing jam detection
The duplex printing unit uses the duplex-unit-pickup sensor (PS122) to detect jams. The
microprocessor on the dc controller PCA determines a jam situation if the sensor indicates that paper
is present at an unexpected time or that paper is not present at the expected time. The
microprocessor on the dc controller PCA notifies the formatter that a jam has occurred.
When a jam is detected, the transport process stops and a 13.XX.YY JAM message appears on the
control-panel display. For more information about jam messages, see
Resolving control-panel
messages.
126 5 Theory of operation
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