HP LaserJet M4345 MFP - Duplex-printing jam detection; Duplex-unit-pickup delay jam

Figure 4-32 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.
Duplex-unit-pickup delay jam
If the duplex-unit-pickup sensor (PS122) does not detect the leading edge of the paper within a
specific time period after the duplex feed motor (M107) starts driving, the microprocessor on the DC
controller PCA determines that a duplex-unit-pickup delay jam has occurred.
158 Chapter 4 Theory of operation ENWW