HP LaserJet 4 Service Manual - Page 269
Possible Cause, Action, Table 7-14
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Table 7-14 Faulty Registration Possible Cause Action Paper. The surface of the paper may be too smooth for the pickup roller to move the paper through the paper path. Change paper. Try a brand of paper known to be good. 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 sensor (PS1) is broken, it can not sense the presence of paper at the registration point. Replace the Input/Registration Sensor. Drive Gears. If any gear within the gear drive train becomes excessively worn or dirty, erratic paper movement results, causing image misregistration. Examine the gears along the paper path for wear and contamination. Clean and inspect the gears. Replace any broken or defective gears. Paper Tray. The paper tray may be preventing the paper from moving through the printer. Verify that the tray is loaded correctly. Verify that the paper tray is seated fully 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