Savin 4075 poor fusing

[Exok]

Hello all,
I have a Savin 4075 with what seems to be a fusing problem.

Using standard 20lb paper, copies are coming out with toner streaks from the fusing unit. Causing the machine to jam before the paper reaches the fusing unit, you see that the image looks fine with no streaks. The streaks seem to start at the lead edge. The customer also prints on a thicker letterhead paper and the problem is much worse on that paper. Looks like very poor fusing. You can even wipe off some of the image from the letterhead paper.

I've made sure all the fusing SP settings are at default.

I've replaced: Upper and Lower fusing rollers. Upper and lower fuser roller bearings. Upper roller bushings, both thermistors, fusing web and web pressure roller.

After replacing all that, my symptoms were worse than when I started.

I did get a little better results when I increased the fusing temp in SP settings. I think the normal setting is 190F and I maxed it at 205F. But the problem remains.

My manager suggested replacing developer to see if there is defective toner causing the problem.

Any other suggestions would be welcome.

Thanks

[blackcat4866]

Re: Savin 4075 poor fusing

... My manager suggested replacing developer to see if there is defective toner causing the problem.

Any other suggestions would be welcome.

Thanks

If you're worried about generic toner (and that is a distinct possibility), you'll need to change both the developer & toner to OEM.

Also your newly rebuilt fuser is probably again caked with partially fused toner from previous attempts. Have you considered lowering the fuser temperature? It's equally likely that the proper heat window is a lower temperature. Both too high and too low temperatures produce indistinguishable results.

You've done a nice thorough examination of the problem, and explained yourself clearly. I enjoy answering posts like this.
I started the day with just the opposite:
Customer: I'd like my machine defaulted to black & white.
Me: OK. What kind of machine do you have?
Customer: Um, I don't know ... it's gray, I think.
Me: (Ah, a genius.) ...

=^..^=

[mikadonovan]

Re: Savin 4075 poor fusing

Me: OK. What kind of machine do you have?
Customer: Um, I don't know ... it's gray, I think.
Me: (Ah, a genius.) ...

LOL. Gotta love it just a little.

[trc]

[Fearless V K]

Re: Savin 4075 poor fusing

check your fusing lamps for continuity. I have seen one of the 3 lamps go out and not pop a code. you should also be able to check the fuser temp in service mode to make sure it is actually where it should be.

[Exok]

Re: Savin 4075 poor fusing

All 3 lamps are good and watching temp from SP mode checks out. When I go back, I'll try lowering the temp to 180 to see what results I get. The press roller and bearings have been replaced, along with the upper roller and its bearings and bushings and the thermistors (both). I don't recall but I doubt it was an OEM press roller as we are no longer an official Savin dealer anymore. Most likely Katun part. I've never had any problem with Katun press rollers in the past though. (drums... yes, I refuse to use Katun drums)

I didn't get a chance to go back yet this week. I'll update you after my next visit. Feel free to add any additional suggestions.

Thanks!

[techsass]

Re: Savin 4075 poor fusing

Is this the same as a Ricoh 2075? (B140 engine)

If it isn't a Toner issue, I'd check the Pressure roller cam assy. You should get an error if the motor flag isn't turning, but the Pressure roller may still not be butted up against the Hot roller properly. You might try bypassing the cam mechanism so that you always have full pressure to test it.

Also be sure to clean the upper frame between the Transfer & Fuser units. That always gets caked with toner that can cause streaks.

[Exok]

Re: Savin 4075 poor fusing

Looks like my developer went bad. I went back to this machine yesterday and put in a fresh bag of developer. All copies are fusing great now, even the thicker letterhead paper. The old developer only had about 100k copies on it so it should have been good for a while longer. I ran many copies of heavy toner fill to make sure the toner being added didn't make the problem come back and so far it looks good. I had to order another part for the machine though.

A 2nd problem popped up while testing the machine. When my paper level went low on tray 1, the machine displayed "add paper". There are 3 paper height sensors on the right half of the tandem tray. If the top sensor was being blocked it would trigger the machine to say "add paper". After a bit of troubleshooting, it looks like the problem is with the paper feed control board. When I go back with the board, I'll test the toner / fusing problem some more and report back you to folks.

Thanks for all the suggestions.