Duplexer jam detection
The following sensors detect whether or not the print media is present and is feeding normally.
■ Tray 2 paper sensor (PS101)
■ Pre-feed sensor (PS102)
■ Top-of-page sensor (PS103)
■ Face-down tray paper-full sensor (PS104)
■ Tray 1 (multipurpose tray) paper sensor (PS105)
■ Paper-width sensor (PS106)
■ Fuser-delivery sensor 1 (PS108)
The microprocessor on the dc controller PCA detects a jam by using the sensor to check for media
presence at a specific timing that is stored in the memory.
If the dc controller PCA detects that a jam has occurred, it stops the print operation and an error
message appears on the control-panel display. See
Alphabetical printer messages and Numerical
printer messages.
136 5 Theory of operation
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