Looking for toner fpr xerox 3001 copier

disconnect the toner sensor jack from back side of developer module and make copies

There is a low toner sensor in that machine that gets impacted with toner then doesnt work correctly. It uses sound waves to detect the toner, and once it gets very dirty it no longer works right. It will need to be removed and cleaned.

replace toner cartiage

Check for a jam sensor actuator hanging up. Check for paper dust or toner particals on the sensors if you can see them.
On these types of machines they require lubrication on the fuser mat for proper lubrication to the heat roll and paper transport.
If this mat has not been serviced it might contain high amount of toner on it causing excessive drag on the heat roll. There can be unusual wihistling or bumpy noise when this occurs.
Also the in this case the heat roll might be damaged and may be replaced.

3001 without a doubt, much more reliable.

[Jam 1] Open and close the door. The Reason - In fuser unit or in device of the bypass presenting has stuck the paper. The Action - Delete the stuck paper.

Paper must cover the center to hit the sensor. If paper still goes through without stopping, the paper drive clutch is faulty.

Google a business called "the parts drop" . Give Britt a call I am sure he will have one.

"K" is the black toner.
Follow this link to a "flash" demonstration on how to change toner (scroll down to the bottom of the page):

http://www.office.xerox.com/perl-bin/product.pl?page=sprt&product=6115MFP&country=United%20States&language=en

*please rate me :)

J1 is detecting either a low or out of toner condition.
Maybe just need to have the cartridge shook, replaced or it could lastly need the toner sensor replaced.