HP Pro 4300 C9H70UT C9H70UT#ABA manual Jams in the paper path, Jams in the duplex path

Jams in the paper path

	Table 47. Causes of paper-path jams
	Cause	Solution
	The cartridge shutter open/close mechanism is	The shutter in the print cartridge should open as you
	damaged.	insert the print cartridge. If the shutter does not
		open, replace the print cartridge.
	The registration roller is dirty, worn, or damaged.	Clean the registration roller assembly if it is dirty. If it
	(This applies to jams that occur before the	is dirty after cleaning, or if it is worn or damaged,
	registration rollers.)	replace the registration assembly. See “Registration
		assembly” on page 198.
	The paper-feed assembly (including clutch CL101)	Replace the paper feed assembly. See “Paper feed
	might be damaged. (This applies to jams that occur	assembly” on page 195.
	before the registration rollers.)
	The drive gears are damaged.	Check the drive gears in the paper pickup and main
	(This can cause jams that occur before media	drive assemblies. Replace the pickup or main drive
	reaches the registration rollers.)	assemblies if the gears are damaged. See
		“Paper-pickup assembly,” on page 183 and/or “Main
		drive assembly” on page 186.
	The pre-feed (PS102), top-of-page (PS103), or	Replace the sensor. See “Location of printer
	fuser assembly (PS108) sensor(s) is defective.	switches and sensors” on page 336.
	The DC controller PCA is defective.	Replace the DC controller PCA. See
		“DC controller PCA” on page 181.
Note	Avoid using odd-sized media. Odd-sized media might not transport properly between the transfer
	roller and the fuser without getting jammed.
	Avoid using short-grained paper. Short-grain paper might excessively curl and become jammed.
	This type of jam is often found between the fuser and the output destination or in the duplexer.

Jams in the duplex path

Table 48. Causes of duplex path jams

Cause	Solution
The oblique rollers are worn or damaged.	Replace the duplexer.
The oblique roller drive gears are worn or damaged.	Replace the duplexer.
The duplex feed guide is damaged.	Replace the duplexer.
The duplex sensors are defective.	Replace the duplexer.

Q2431-90912 Chapter 7 Troubleshooting 303