ADF pickup jam
If the leading edge of the media did not reach the registration sensor within a specific period of time,
the scanner controller PCA determines that an ADF pickup jam has occurred.
ADF jam
Jams can occur in three places inside the ADF: at the registration senor, read sensor, and exit sensor.
Registration sensor jam
If the registration sensor does not detect the trailing edge of the media after the leading edge
reaches the scan-ready position, the scanner-controller PCA determines that an ADF paper jam has
occurred.
Also, when the scanner duplexer is being used, if the registration sensor does not detect the leading
edge of the media after a specific period of time after media enters the duplexer, the scanner-
controller PCA determines that a jam has occurred.
Read sensor jam
If the read sensor does not detect the leading edge of the media within a specific period of time, or if
the read sensor does not detect the trailing edge of the media within a specific period of time after it
detects the leading edge, the scanner-controller PCA determines that a jam has occurred.
Exit sensor jam
If the exit sensor does not detect the leading edge of the media within a specific period of time after
the leading edge reaches the read sensor, or if the exit sensor does not detect the trailing edge of
the media within a specific period of time after the read sensor detects the trailing edge, the scanner-
controller PCA determines that a jam has occurred.
ADF cover open jam
If the ADF jam-access cover is opened while media is feeding through the ADF, a jam occurs.
ADF open jam
If the ADF is opened while media is feeding through the ADF, a jam occurs.
142 5 Theory of operation
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