HP manual 251

Table 7-7	Paper Jam Troubleshooting Checklist
Jam Location			Checks and Action Required
Input Area Jams		1.	Check that the Transfer Roller is fully seated and shows no
(Sensed by PS1.)			sign of wear.
		2.	Check that the Toner Cartridge is fully seated.
		3.	Check that the cassettes are not overfull and the media is
			loaded correctly.
		4.	Ensure that the media meets specs. (media is not too
			smooth or rough), and it has been stored properly.
		5.	Ensure that the paper tray is fully seated (especially if
			printing from the Lower Cassette).
		6.	Ensure that the spring force of the Lower Cassette is set
			correctly.
Registration Area		1.	If paper is damaged at the Registration Sensor (PS1),
Jams			check that the Transfer Charge Roller is properly seated.
(Sensed by PS1.)
Lower Cassette		1.	The LC Tray (Tray 3) is not fully seated into the printer. Seat
Paper Jams			the LC Tray firmly into the printer.
(Sensed by PS1.)		2.	The Lower Cassette feed pressure (spring force)
			adjustment is incorrect. Set the spring force as shown in
			Chapter 3.
Fuser Assembly		1.	Check that the Fuser Pressure Roller Levers are down
Jams			(LJ4 and 4 Plus Only).
(Sensed by PS3.)		2.	Check that the Exit Sensor Arm (PS3) is free throughout its
			travel and that the Exit Sensor Arm is installed correctly.
False Paper Jams		1.	PS1, PS3, or PS5 are damaged or mechanically broken.
		2.	The sensor wires are damaged or disconnected.
		3.	The rear door is open.
Paper Jam occurs		4.	Paper out sensors in the paper tray or envelope feeder
			may be defective, or the sensor flags may be broken or
when the last
			missing. PS2 is the sensor for the PC Tray (Tray 2), PS4 is
sheet of paper is
			the sensor for the MP Tray (Tray 1), PS6 is the sensor for
fed from the tray.
			the LC Tray (Tray 3), and PS7 is the sensor for the
			Envelope Feeder.

Troubleshooting 7-21