I'll tell you, the copier gods have not been smiling on me lately!!! Weird, stupid problems......My latest is a 4035 that is not fusing in the center of the page. Changed out fuser, DV assy, drum unit. Running through the 11 X 8 1/2 way, fuses fine on top and bottom of page but about 4 inches in the middle you can smudge the toner if you rub it. The more copies you make, the worse it gets, leaving toner on the heat and pressure rollers. I'm at a total loss here, any suggestions would be appreciated. Thanks.... Jeff M.

I would make sure the toner cartridge has the right color handle, (Blue) I remember reading somewhere there was a problem with the back of the copier where the fuser inserts into the connector with some pins not making good contact.

Is the firmware up to the most recent version available and is the fuser type set right in the Maintenance mode area.

just a guess is the fusing temp correct??

Thanks for your replies. The toner is OEM (blue handle) and the firmware is the latest version. For the fuser type, I know there is 0, 1 & 2, but how do you tell which is which? I tried all 3 settings but none seems to make a difference. I tried upping and lowering the fuser temps, nada. As for damaged pins, I thought about something along those lines, but, a: wouldn't there be an error code if connections were not made correctly, and b: why is only the middle of the fuser affected? Thanks again. Jeff M.

In every fuser box there is a paper that has the instructions on it for checking to make sure that the correct fuser type is set. With out having a new fuser in front of me I can't be sure, but I think it should be Type 1, Check U962. As for the fuser temps, the defaults should be 130 for the control temp during copying, Primary stabilization fixing temp should be 120 for the 4035, Secondary stabilization should be 145. All these settings should be checked in MM U161. Are the thermistors working properly, i have noticed that build up occurs on the face of these that will affect what temp they are reporting, also is the thermistor in proper location and riding on the surface of the heat roller? Other things could be the paper type setting for the cassettes, depending on what you have the paper type set for affects what the fuser temp will be, if you have Bond type paper, which is the highest temp setting according to tech support, but are running plain paper instead, you could get offsetting to occur, but if you are actually running a bond paper or a slightly heavier paper with plain settings you could get poor fusing to occur.

Did you put a NEW fuser in or did you rebuild the current fuser? Many times we will take two broken fuser to make a usable one. I try to think about basics;
1)Could lower press roller be fat on the ends causing a gap in the middle. This could also cause wrinkling though.
2) Could it be a bad heat lamp.
3) I have questioned if the toner is mixed well in the cartridge. Shake the toner cartridge, is the toner gritty in the center of the paper.
I am thinking it is a mechanical problem, not a software issue, since it is fusing on the top & bottom, just the middle is not fusing.

If you replaced the fuser then you have a fuser type 1. Also, Have you tried other paper or orientation?

Thanks for your replies. Both fusers (the original one in the machine and the one I replaced it with) are OEM, both with under 160K on them. Each will work in another machine, so I don't think i';s the fuser itself. It was set to type 0 (I never changed it when I reconned the machine, it only had 70K when I got it). Changed the setting to 1 & 2 with no discernable difference. It's been doing 15K per month since last July without missing a beat, all of a sudden this happened. Tried my paper, re-oreinted the paper to 8 1/2 X 11R, all with no change. Jeff M.

They modified the pressure springs on this fuser. Can you get your hands on a new unit?

I have a 5035 and I'll have another 4035 coming in this week. I'll try the 50 fuser when I get back in Monday, but I'll be honest, I don't have high hopes. Will let you know what happens. Thanks... Jeff M.

Update on the fusing problem on a 4035. It was the power source power supply (PSPCB). Was talking to Mark @ Ambassador and he suggested it might be only one heat lamp was being powered. So I dug out the service manual and traced what controlled the fuser. Tried another PSPCB and worked perfectly! Thanks to all for your responses and especially to Mark! Jeff M.

wow!!! thanks for the update!!