Table | Faulty Registration |
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Possible Cause |
| Action | |
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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. |
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Worn Pickup Roller and Separation Pad. |
| If the Paper Pickup Roller, or the | |
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| Separation Pad are sufficiently worn, the |
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| leading edge of the paper may not reach |
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| the registration assembly in time. |
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| Replace the Pickup Roller and |
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| Separation Pad together. |
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PS1 faulty. If the Input/Registration |
| Replace the Input/Registration Sensor. | |
sensor (PS1) is broken, it can not sense |
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the presence of paper at the registration |
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point. |
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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. | |
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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. |
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| into the printer. If possible, exchange tray |
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| with another printer to see if the problem |
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| is associated with the tray. Note the HP |
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| LaserJet 4/4M tray is NOT |
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| interchangeable with the HP LaserJet 4 |
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| Plus/4M Plus tray. The LJ5 paper trays |
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| are not compatible with the LJ4 or LJ4+. |
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| Replace the paper tray. |
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DC Controller replaced. |
| If the DC Controller was replaced, adjust | |
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| VR202 as shown in Chapter 6. |
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Paper Input Assembly replaced. |
| The HP LaserJet 4/4M Paper Input | |
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| Assembly is NOT compatible with the HP |
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| LaserJet 4 Plus/4M Plus. The LJ5 Paper |
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| Input Assembly is not compatible with the |
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| LJ4 or LJ4+ Input Assemblies. Installing |
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| a |
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| in paper input registration problems. |
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Troubleshooting