HP Pro 4300 C9H70UT C9H70UT#ABA manual Specks or dots Possible cause Recommended action

Table 57. Specks or dots

Possible cause Recommended action

Specks

Specks might appear on a page after a jam has been cleared. Print two to three more pages and see if they disappear.

There is dirt in the printer.	1. Print a few more pages and see if the problem corrects itself.
	2. Clean the inside of the printer (see chapter 4)
	3. Process a printer cleaning page. See “Running the cleaning
	page manually” on page 56.
The print cartridge has damaged	● Perform the half self-test functional check (see “Half self-test
components.	functional check” on page 310). If the problem developed on the
	print drum, replace the print cartridge.
The media does not meet specifications	1. Turn over the stack of media in the tray. Also try rotating the
or is not stored properly.	media 180 degrees.
	2. Check the media for type and quality. Replace the media,
	and advise the customer to use the HP recommended
	media and to store it correctly. See “Paper specifications” on
	page 9.
The fuser rollers are worn out.	● Replace the fuser. See “Fuser” on page 162
Dots (in the paper path direction)
The static eliminator teeth are dirty.	● Clean the static eliminator teeth with a small brush or
	compressed air.
Poor contact between the static	● Clean the contacts, if they are dirty. If the problem persists after
eliminator teeth and the power supply.	cleaning, or the contacts are damaged or deformed, replace
	them.
The transfer roller is deformed or	● Replace the transfer roller. See “Transfer roller” on page 138.
deteriorated.
The power supply is defective.	● Replace the power supply. See “Power supply” on page 188.

314 Troubleshooting Q2431-90912