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