HP 4101mfp See Cleaning the ADF delivery guide, Clear mylar strip on, Vertical lines, Unit on

Table 23. Image defects (continued)

Problem	Condition	Solution
Page skew	The ADF unit or scan unit needs to	● Calibrate the scan unit. See
	be calibrated.	“Calibration” on page 47 and/or
		“Performing manual calibration” on
		page 48.
	ADF input tray guides are not	● Verify that the ADF guides are not
	properly adjusted.	adjusted to tightly against the media or
		to loosely and separate from the
		media.
	ADF paper delivery guide (clear	● Clean the ADF paper delivery guide.
	mylar strip) is dirty.	See “Cleaning the ADF delivery guide
		(clear mylar strip)” on page 37.
Vertical lines	Dirty glass, whiteboard cover, ADF	● Clean the glass, whiteboard cover,
	delivery guide (clear mylar strip).	and/or ADF delivery guide (clear mylar
		strip). See “Cleaning the product” on
		page 36.
	ADF unit and/or scan unit is	● Calibrate the scan unit. See
	improperly calibrated.	“Calibration” on page 47 and/or
		“Performing manual calibration” on
		page 48.
	Deformed pickup roller.	● Replace the deformed roller. See “ADF
		pickup roller” on page 74.
	Foreign substances are deposited	● Clean the pickup roller (flatbed).
	on the pickup roller.	● If the problem persists, replace the
		pickup roller. See “ADF pickup roller”
		on page 74.
	Defective optical-unit CCD driver.	● Replace the optical unit. See “Optical
		unit” on page 95.
	Scars on the mirrors or lens in the	● Replace the flatbed optical unit. See
	flatbed optical unit.	“Optical unit” on page 95.
Image shifted	Image is shifted vertically,	● Calibrate the scan unit. See
	horizontally, or both ways on the	“Calibration” on page 47.
	page. Scan unit is improperly
	calibrated.

Image skips	Image shifts on the page or starts	●	Verify that the ADF document-detect-
	and stops at irregular intervals		sensor (PS2) and leading-edge-sensor
			(PS1) flags move freely. See
			“Document-detect sensor (PS2)” on
			page 68, “Leading-edge sensor (PS1)”
			on page 68, and “ADF components”
			on page 56.
Unexpected image	Unexpected images when using the	●	Verify that there is not any media left
	ADF to make copies.		on the glass from a previous copy job.

C9148-90909 7 Troubleshooting 139