For Xerox® models: 4112 style
Drum Reset Connector CRUM - resets 013R00646, 13R646, 013R00639, 13R639
This part is the RF (Radio Frequency) chip which is needed to reset the Drum counter to 0. Please make sure that your machines use this reorder number (13R646) because there are several versions of the Drum Cartridges / CRUMs for these machines and the CRUMs are not interchangeable.
he Drum Reset CRUM is located just under the top cover near the rear end. You will find that our generic CRUM has larger components than the Original ones... When you install it, place it with the flat side up... because of the larger electrical components on our crum, the top cover will not close completely when you reinstall it. but the CRUM will function properly if installed this way.