HP 5m C3917A, C2021A, 5n C3952A, 5 C3916A 22Black Pages with Horizontal White Strips, Image Skew

Table 7-22Black Pages with Horizontal White Strips

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

Troubleshooting 7-43