IR 5570 Poor fusing

[bizhub1]

Hello, I have a 5570 that is having some fusing issues. Toner smearing on the front and backs of copies, especially on long runs. Seems to be running at the correct temp, no error codes, Any suggestions would be appreciated.

[totoro]

I would check the pressure roller, pr bushings and pr bearings first as they are a problem in this series. Then check the bushings and bearing for the hot roller.

[bizhub1]

I have replaced the lfr and bearings, the upper is fine and still not fusing correctly

[charm5496]

what kind of paper stock is the customer running?
This unit is not as forgiving as the previous IR models.

[Herrmann]

The IR 5700 has an inductive heater system, to prevent overheating of the upper fixing roller, there is a metal shielding plate inside the fixing roller called *flux shielding plate* (no joke). Check if this shield is positioned correctly

[bizhub1]

Thanks for the replys gentlemen, I have checked the shutter and all seems fine, I was out at 2 different 5570s in the field and checked them with a katun b/w test chart and they do the same thing. It seems all right when you run just text, but when you run some heavier coverage it smears toner and builds up on the upper and lower. Maybe thats part of this machine, it seems they all run at about 185C, that seems to low to me. I am going to try a different heater core and see if that helps.

[bizhub1]

Just wanted to let you guys know I replaced the UFR, thermistor unit, bearings and bushings, inspected the heater and shutter unit, still get specks and smears on prints.

[NSCT]

Are they using aftermarket toner?

[djbass]

piccy of a test page might help if possible.

[bizhub1]

It is oem toner, the machine has 150k on it

[mrfixit51]

Your solution may lie in these settings...

COPIER > OPTION > BODY>FIX-TEMP in level 2

Use it to select down sequence mode.

0: normal (default)
1: standard + 10 deg C
2: standard - 5 deg C

Your solution may lie in these settings...

[bizhub1]

thanks for the reply mr. fixit. Yes I tried all the adj. and none of them make a difference. The more I look at this fuser the more I am not impressed.

[ReproKev]

I have the same problem with a 5570 at a small print shop. When running card stock you can easily rub the toner off. I've replaced UFR, LFR, bushings and bearings - that helped some. I'm ordering thermistors today. I'll let you know if that helps more.

[Herrmann]

Let's Try some diagnostics, first at all, place a few sheet of a4/ltr paper in the bypass. Then enter Service Mode, COPIER>FUNCTION>FIXING, the do the NIP-CHK. A sheet comes out with a gleamy stripe on it. It should measure between 4,5-6,5mm in the middle and get bigger to the ends of the sheet, up to 8mm. What results do you get?

[bizhub1]

yes, thanks for the reply, did nip test right away, was at about 5mm, I actually adj. it both ways for the hell of it, made no difference.