DC12's fusing problem. HELP

[sengineer]

Dear engineers what do you think about dc12 that used mainly for printing heavyweight materials about 250 gramms/m2? How to obtain maximum fusing quality and not face with insufficient oil conditions?
The quastine arised because i faced with the machine with 50K counter and dead heat rolls. The surface of heat roll was practically dry even with just installed new oil system.

A month ago another engineer not qualified with this machine found out a strange stains on fused lightweight prints. Heavyweight was OK. After discussion with another man that only seen the defect on scanned e-mailed image they made a decision to replace oil system.
At the moment of replacement I was with 1st engineer and saw defect by myself. This was intricate watermarks. Having replaced the oil system we found out the defect to arise. My quick check brought to light Oil pump was operable and provided oil to metering roll, donor roll oiled too but heat roll was practically dry. Nip is about 10mm I/B O/B, but about 7-8 mm in the middle. Prints not gloss. Plain paper prints have watermarks and wave deformation. NIP variations doesn't give any good results. Only fusing problems with toner pulled off with my nail.
So... I Think all the problem are due to old oil assy with dirty steel metering roll that didn't supply enough oil and after a great amount of heavyweight prints this conditions caused degradation of heat roll surface. Now after installing new oiler i have to replace heat/pressure rolls. Am I right?
Please analize this incident and give me an advice.
What about oil assy rolls from different materials?
How to prevent occurance of heat rolls degradation under same print volume and heavyweight materials. Thanks to any information

[xcopytech]

replace fuser rolls, adjust fuser nip to 10.5 +-0.5 mm.
clean external heat roll, clean oil blade and pickup roll (metal roll in oil assembly).
check oil pump

to keep machine in good working condition will need to clean fuser assy every 10.000 prints.

[davidj7]

i used to take prints in paper up to 300 gsm although xerox dosent recommend it .I had no problems.Do things xcopytech told and it will run fine.Replace is what I would do if nearing HFSI

[sengineer]

How you clean fuser assy every 10K ?

Usually I clean oil filter, tubes and wick from dirty oil. Steel metering roll and external heat roll I clean with strong solvent. What about donor roll and heat rolls. What fluid can be used if needed for servicing?

[xcopytech]

fuser rolls do not clean with any solvent cleaner.
usually do not clean fuser rolls with anything, just replace them.
if you keep pickup roll clean and with good oil system (pump, tube) you will not have any reason to clean fuser rolls.
also if you have to replace oil pump and do not have it on stock can use pump from canon clc 1100, or from older xerox machines like 5760/65-5790/99.

[WIWA]

Hello, on your case use only genuine Xerox fuser rolls adjust them to 10.0 +- .5 after a good run on white paper only just to brake in the rolls. check oil pump and paper dust at the oil tank to prevent pump clogging. clean external roll with stealwool the best to clean it . use clean fuser web not rolled back . the last thing increase oil pump time at nvm value 777-051 10000 is the maximun.

hope this help,

Wiwa 72

Gonzos build v1.0

[sengineer]

Thanks for NVM . Thought about increasing oil dispence but didn't find an instruction. Don't remeber if it mentioned in EDOC.
What range of adjustment does this NVM chain provide and in what units does it measured? milliseconds?

[WIWA]

Hi, yes is in ms for enviorements high pumpers I recommend 10000 full blast but a hint for to much oil is jamming on glossy paper at the start on the fuser you may see oil on the paper border. but normally I use 8000 with good results.



Hope this help,

Wiwa 72
Gonzos build v.1.0

[xcopytech]

But SM told that with 11.50.3 IOT software, this does not work, machine do not control pump separately from fuser motor.

[TechMate]

What range of adjustment does this NVM chain provide and in what units does it measured? milliseconds?

The nominal value for nvm 777-051 is 3000ms (range 100-10000) but it only works with machine firmware below version 11.50.3c