08-18-2010 10:20 AM
08-18-2010 11:21 AM
08-18-2010 11:06 PM
Load your media in tray 1, print the page as your doing to produce the defect but watch the paper as it's loading, it will pull in initally about an inch (which will load into the registration assembly), then almost immediately it will continue to feed into the printer, if you hold a piece of paper manually in the printer you can work out how far you want it to feed before it gets to the fuser, I normally make a small pencil mark on the paper so when I see it has fed this far you stop the half test.
To stop the test simply open the top cover, remove the print cartrige then very carefully remove the paper, inspect it to see if the defect is on the media, if it is then it has happened before the fuser.
If the defect is on the main face i.e upper then the cartridge is your suspect, if its on the under side then the transfer roller.
The half test is used to qualify the print process and can save you changing the fuser or other parts without reducing the odds down to an acceptable level.
hope this helps you narrow the issue down.
(Don't forget Kudos if people have helped)