MPC 4500 fusing problems

[countrytech]

G'day I am having a run on colour problems, and this one has me beat.
The prints (copies) with full colour designs are not being totally fused, and as a result some of the image is being left on the fuser belt. I have tried increasing the temp. and this has little or no effect. Black copies are fine, it is only with solid colour that the problem exists. If I change the settings to ' thick 2 ' I get a slightly better (not good by any means) result. Fuser pressure appears fine. No obvious damage to the belt.
Machine has only done 80k black and 35k colour. Am I missing something, or has anyone had this concern?
Thanks

[TonerMunkeh]

Set the paper type to middle thick and increase the fusing temperature by 5 degrees for that setting in SP modes. That usually sorts fusing problems for me.

[Fearless V K]

I agree, also check the condition of the oil supply roller.

[countrytech]

The oil roll was very dirty, so have ordered another. Will let you know the result

[rthonpm]

Don't forget to also order the cleaning roller for the oiler. Most fusing issues with this machine can be eliminated by replacing these almost religiously.

[Prodigal Son]

When I get heating issues I usually replace thermistors... there are 2 such in the MPC4500 fuser, my bets are on them.

[Ltd]

Don't forget to also order the cleaning roller for the oiler. Most fusing issues with this machine can be eliminated by replacing these almost religiously.

Yes, Oil+Cleaning rollers need to check first.

[Wishbone]

Also 24-26 lb. paper works best in these.

[countrytech]

Thanks guys customer is using 80gsm paper

[countrytech]

G'day I wish I had another mpc4500 to compare, as when I check the print out of the temps it just seems wrong. For example ( 1106-01 ) fusing temp reads centre +97 ends +98 and pressure is +158. Could be the thermisters on the belt? I checked a mpc3000 and all temps are what I would call close to average about 160. The defult ready temp for the 4500 is listed as 138
I think I'll add 2 thermisters to the rolls on order.
On top of that I now have a LD135 giving a ' 0 ' reading on the centre thermister, and has cooked the fuser roll. Anyway its friday tomorrow

[countrytech]

update - the oil roller and the thermistors have been changed, and now as a copier it is acceptable, but when printing from pc , the non fusing problem appears. Tomorrow i'll check their system. If any other suggestions, please let me know. Thanks

[kentala]

MPC4500 fuser trouble

Gday Mate,

Whilst all these are good suggestions.Sometimes certain things just wont fuse properly.This is where the machines limitations can be a factor.I'd try the new oil/cleaning roller trick or a new fuser.You can only bump the temp so much.Increasing this will reduce fuser life .Sometimes you just can't do the impossible brother!

[Prodigal Son]

update - the oil roller and the thermistors have been changed, and now as a copier it is acceptable, but when printing from pc , the non fusing problem appears. Tomorrow i'll check their system. If any other suggestions, please let me know. Thanks

Whenever I get these problems I usually end up explaining to the customer how to change from plain to heavy paper in the driver (paper tab). If they print on heavier paper, or if the paper is moist (some ppl buy their paper from an offset printing business and they moist their paper because it's better when using it for offset) you must fuse it longer. You could always try to run the paper through the copier first (just copy a white paper), then put it back in the tray and try printing on it. If that works it's probable the paper is moist.

[countrytech]

At last it appears to be working ok. Had to change the fuser - complete - as the thermistors and rolls improved the image but not completely. Thanks to all who assisted