Price exc vat :
The printer manufacturer has installed a built-in counter to make sure that you replace the drum at certain intervals to maintain image quality. In most cases it is not necessary to replace the drum If the drum was working correctly before displaying "Replace Drum Unit" message. The drum will work correctly with a new chip installed which will reset the counter to 100% again.
HP Drum Reset Instructions:
Replace your old chip with the new chip. Replacing the chip will reset the counter back to zero and you can continue printing.
One chip required per drum.