HP 4 C2001A, C2021A, 5n C3952A, 5 C3916A, 5m C3917A, 4 plus C2037A manual Faulty Registration

Table 7-14	Faulty Registration
Possible Cause		Action
Paper. The surface of the paper may be		Change paper. Try a brand of paper
too smooth for the pickup roller to move		known to be good.
the paper through the paper path.
Worn Pickup Roller and Separation Pad.		If the Paper Pickup Roller, or the
		Separation Pad are sufficiently worn, the
		leading edge of the paper may not reach
		the registration assembly in time.
		Replace the Pickup Roller and
		Separation Pad together.
PS1 faulty. If the Input/Registration		Replace the Input/Registration Sensor.
sensor (PS1) is broken, it can not sense
the presence of paper at the registration
point.
Drive Gears. If any gear within the gear		Examine the gears along the paper path
drive train becomes excessively worn or		for wear and contamination. Clean and
dirty, erratic paper movement results,		inspect the gears. Replace any broken or
causing image misregistration.		defective gears.
Paper Tray. The paper tray may be		Verify that the tray is loaded correctly.
preventing the paper from moving		Verify that the paper tray is seated fully
through the printer.		into the printer. If possible, exchange tray
		with another printer to see if the problem
		is associated with the tray. Note the HP
		LaserJet 4/4M tray is NOT
		interchangeable with the HP LaserJet 4
		Plus/4M Plus tray. The LJ5 paper trays
		are not compatible with the LJ4 or LJ4+.
		Replace the paper tray.
DC Controller replaced.		If the DC Controller was replaced, adjust
		VR202 as shown in Chapter 6.
Paper Input Assembly replaced.		The HP LaserJet 4/4M Paper Input
		Assembly is NOT compatible with the HP
		LaserJet 4 Plus/4M Plus. The LJ5 Paper
		Input Assembly is not compatible with the
		LJ4 or LJ4+ Input Assemblies. Installing
		a non-compatible Input Assembly results
		in paper input registration problems.

Troubleshooting 7-39