HP color laserjet 2550 series Manuale Di Servizio
●
PS716 paper sensor (optional tray 2)
●
PS717 paper-feed sensor
Note
Only optional tray 2 is shown; optional tray 3 is similar.
Figure 4-7.
Optional tray 2 (250-sheet paper tray)
Jam detection
The registration sensor (PS711) and the fuser sensor (PS1) detect media that is moving
through the printer. If a jam is detected, the dc controller immediately stops the printing
process and sends a message to the video controller circuit.
through the printer. If a jam is detected, the dc controller immediately stops the printing
process and sends a message to the video controller circuit.
A jam can be detected under any of the following conditions:
●
Pickup delay jam. The leading edge of the print media does not reach the registration
sensor (PS711) within 1.1 seconds (tray 1), 1.7 seconds (optional tray 2), or 2.8 seconds
(optional tray 3).
sensor (PS711) within 1.1 seconds (tray 1), 1.7 seconds (optional tray 2), or 2.8 seconds
(optional tray 3).
●
Pickup stationary jam. The registration clutch is on, and the registration sensor (PS711)
does not detect the trailing edge of the media within 3.4 seconds after the start of a re-
pickup operation.
does not detect the trailing edge of the media within 3.4 seconds after the start of a re-
pickup operation.
●
Fuser wrap-jam. The main CPU detects media inside the fuser front sensor (PS720)
when the power is turned on or after the top cover is closed.
when the power is turned on or after the top cover is closed.
ENWW
Pickup and feed system
77