2238 screeching noise

[leo34staffs]

Hi guys,
We have a customer that is having a problem, whereas first thing in the morning the machines makes a screeching noise, i am going to go there first thing in the morning, as when i go it never happens. The only problem is that first thing in the morning is 6 AM. So does anybody have any ideas of what could be causing this, i have already stripped/cleaned the transfer to no avail.

Thanks.

[rthonpm]

Check the PCU's and the dev units. Sometimes they seem to walk forward, even with the newer developer units installed.

[nmfaxman]

Check the fuser unit.
As it warms up the silicon oil becomes more fluid.
If it happens only in the morning and not any other time I would focus on something that warms up the fastest.
Tell them to not turn it off and let the energy saver control temp.

"If a noise doesn't cause a jam or a failure code, I can't find it."

[blackcat4866]

I agree with nmfaxman. Fuser bearings will very commonly squeal like a stuck pig at startup, but after the fuser heat warms them up a while they can quiet down. Look at the outer surface of the fuser bearings. If you have rust, or scraping marks, or the fuser is just difficult to turn, that's it.

=^..^=

[tjvincent]

I would bet its one of the drum units , they are all the same. Put the old screwdriver as a stethoscope and listen , i always seemed to find it when running the first copy or when it did a recalibration.

[Jomama46]

All good possibilities and I would add oil supply unit, when they get dry from dust, they can squeal like a stuck pig.

[leo34staffs]

Thanks for all the input guys, when i went there ,the noise only lasted for about 10 seconds then went away!!! i replaced the oil supply unit and the user said it was quieter, so i replaced the fuser assy aswell, that had done 146% of its life....no call back as yet about the noise so i think its sorted.

Many thanks for your posts....they always point me in the right direction.