- Hewlett-Packard Printer User Manual

Possible Cause Action
Laser/Scanning Assembly or DC
Controller PCA.
Replace the Laser/Scanning Assembly
followed by the DC Controller PCA, if
necessary (see Figure 7-12 for locations).
Table 7-22
Black Pages with Horizontal White Strips
Possible Cause Action
Input/Registration Sensor (PS1). The
Paper Pickup Roller positions the leading
edge of the paper at the
Input/Registration Sensor (PS1). If this
sensor is defective it may not sense the
presence of the paper reliably (on time).
Replace the Input/Registration Sensor.
Skew tolerance for the printer is 1.5mm
over 260mm page length.
Drive Gears. If any gear within the gear
drive train becomes excessively worn, or
is excessively dirty, erratic paper
movement would result, leading to image
misregistration.
Closely examine the gears along the
paper path for wear and contamination.
Clean and inspect the gears. Replace
any defective gear.
Paper Tray. The paper tray may be
preventing the paper from freely moving
through the printer.
Verify that the tray is loaded correctly.
Verify that the paper tray is seated fully
into the printer. Switch trays to verify that
the problem follows the tray. Replace the
paper tray.
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 paper known to be
good.
Paper too heavy? See Paper Specifications in Chapter 2.
Table 7-23 Image Skew
Troubleshooting 7-43