Jam detection
The device contains five sensors that verify whether or not media is transported smoothly through the
device.
Figure 6-2 Jam-detection sensors on page 216 shows the sensors.
Figure 6-2 Jam-detection sensors
PS901 Top-of-page sensor SR2 Delivery sensor
PS903 Media-width sensor PS4 Output-bin-full sensor
PS502 Duplex sensor
The CPU on the ECU identifies jams by checking whether media is present during the printing process
against media-transport timing, which is stored in memory. When the CPU determines that a jam has
occurred, it stops the printing operation and sends a signal to the formatter so that the touchscreen can
show an error message.
The CPU determines a residual-media jam if one or more of the sensors PS901, SR2, PS502, or
PS903 detects that media is present after power-on or when an open door (for example, the cartridge
door) is shut.
The CPU determines a delivery-delay jam if PS4 does not detect the leading edge of the media within
a specified time after PS901 detects the leading edge.
216 Chapter 6 Troubleshooting ENWW
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