HP Pro 4300 C9H70UT C9H70UT#ABA manual Image defects, Image quality, HP paper specification

	Image defects
	Overview
	This section helps you define print-quality problems and what to do to correct them. Often
	print-quality problems can be handled easily by making sure that the printer is properly
	maintained, using print media that meets HP specifications, or running a cleaning page.
Note	Do not use letterhead paper that is printed with low-temperature inks, such as those used in some
	types of thermography.
	Do not use raised letterhead.
	The printer uses heat and pressure to fuse toner to the paper. Make sure that any colored paper
	or preprinted forms use inks that are compatible with the printer’s temperature of 230° C (446° F)
	for 0.05 second.
	Avoid using paper that has been damaged due to having already been used in a printer or copier.
	(Do not print on both sides of envelopes, transparencies, or labels.)

Image quality

When you are working with customers, obtain a print sample before you begin troubleshooting their printer. Ask the customer to explain the quality expected from the printer. The print sample will also help clarify the image-quality issue.

Table 53. Image quality checks

Image quality checks Action

Does the problem repeat on the page?

Use the repetitive defect table to determine the cause of the repeating defect. See “Repetitive defects troubleshooting” on page 325.

Is the print cartridge full and is it manufactured by HP?

Check the print cartridge as described in this chapter and verify that you are not using the EconoMode setting when sending the print job. See “Check the print cartridge” on page 309 and “EconoMode” on page 309.

Is the customer using print	For more information about HP’s paper specification standards, see
media that meets all	chapter 1 or the HP LaserJet Printer Family Print Media Guide. See
HP paper specification	“Supported sizes and weights of media” on page 10 and “Supported types of
standards?	media” on page 14.

Is the print sample similar to those in the print quality tables that begin on

page 311?

Compare the sample to the print quality tables in this chapter and perform the corresponding procedures that are recommended. See table 54 on page 311.

Is the problem with the print cartridge, the transfer roller, or the fuser?

Perform the half self-test functional check and the drum rotational functional check to determine the location of the defect. See “Half self-test functional check” on page 310 and “Drum rotation functional check” on page 310.

If a correct toner image is present on the drum’s surface, assume that the first four functions of the electrophotographic process are functioning, and troubleshoot the failure as a transfer or fusing problem. If the image on the paper looks good before it enters the fuser, then the problem exists in the fuser.

308 Troubleshooting Q2431-90912