I managed to find another fuser draw assembly and swapped the heated rollers over from the faulty fuser into the new one and it solved the problem. Sadly I never found which part was defect but its now working. great! Dave TI managed to find another fuser draw assembly and swapped the heated rollers over from the faulty fuser into the new one and it solved the problem. Sadly I never found which part was defect but its now working. great! Dave T
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My Lions club was given a 780 and most of the time it will print one sheet at a time OK. But trying to print multiples it stops half way thru the fuser or on the exit side of the paper is printed. We have replaced the fuser, imaging unit, waste canister. This printer has great features and quality. We really would like to use it to it fullest potental. Your thoughts.
This problem occurs do to a defect in the fuser drawer. In the fuser drawer, there are two black plastic parts that can go up or down. Their function is to push the belt cleaner on and off the accumulator belt after every pass. A defect in this system causes these parts to stay up, pushing the belt cleaner on to the belt every step except the last one, causing only the black toner to remain on the belt.
It's hard to track what the exact cause is but I would recommend checking gearing and gear teeth in your fuser drawer.
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Are the streaks evident when printing actual images? I was told by an experienced Xerox service tech that those solid-fill test pages can be misleading -- mine does the same but prints photos beautifully. I suggest printing some full page photos, check for the streaks. You've already done just about all you can.
When you print something from a website and the print box comes up, click on preferences tab, and when it comes up click on color . Then click on print in grayscale and change the setting from High Quality to Black ink only, click apply at the bottom, then OK. It should print in black ink.
It looks like you may have some damage to the black IU. If you have an old one or a spare to try as a test that might help. The drum is easily scratched and this then produces marks or lines in the appropriate colour.
I had this problem when I used a generic toner. I installed a xerox cyan toner, then printed many sheets of a large blue rectangle. After about 15 pages the blue started to spread into the shape, after 30 pages the blue was back. Printing a lot of blue was necessary to get the new toner thru the system.
Doubt it be the fuser(100 000life), "just magenta dots".... fuser would be "all smudged" or "black marks" , "the print rubs off" , "paper is creasing or jamming"
Can prove it by stopping a print (open door) when paper is1/2 way threw machine, you need to stop it before it goes threw the hot bit, so you can tell if the hot bit (fuser) puts the marks on the paper.
Transfer roller one would expect to effect whole print Smudged/Faint,uneven density
It will be the imaging unit ( 30 000 pagelife Ouch$ ) or possible leaking toner (if aftermarket)
Remove imaging unit and inspect film you should find image of lines, dots are usually chips or sticky stuff on drum surface, carefull no oily human fingers on surface please.
When stopping machine mid print and perfecting your timing, pull out the imaging unit and look at replica of your print notice if marked and where.
only print black and white now, suddenly
I managed to find another fuser draw assembly and swapped the heated rollers over from the faulty fuser into the new one and it solved the problem. Sadly I never found which part was defect but its now working.
great!
Dave T
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