- Hewlett-Packard Digital Sender Service Manual

Jam detection
When the sensors inside the ADF detect a jam, the feed and read motors immediately stop. A signal is
sent to the scanner controller board, which notifies the formatter. An error message appears on the
control-panel display.
To clear a jam, open the jam-access cover and remove the media. When sensors do not detect media
after entering the jam state, the jam message is cleared from the control-panel display.
Residual-media jam
During the initialization sequence or after the ADF jam cover has been opened and closed, if the
registration sensor, read sensor, or exit sensor detects the presence of media, the scanner controller
board determines that a residual-media jam has occurred.
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 board determines that an ADF pickup jam has occurred.
ADF jam
ADF jams can occur in three places inside the ADF.
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 board determines that an ADF jam has occurred.
Also, when the scanner duplexer is in use, 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 board
determines that an ADF 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 board determines that an ADF 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
board determines that an ADF 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.
ENWW Flatbed unit and ADF system 33