Resetting the Hewlett Packard C6656A (#56) or C8727A (#27) Black Ink Cartridge Estimated Ink Level

There are a few different ways to get the estimated ink level to read full on your HP toolbox.  To better understand the procedure you are about to follow, it helps to know what causes your cartridge to read empty.  There is a serial number embedded in the electrical that allows the printer to keep track of each cartridge's activity.  The printer will remember the previous two cartridges that have been inserted.  After a third cartridge has been inserted, the memory of the first cartridge is dumped and lost forever.  After that, if the first cartridge is reinserted into the printer, it will read full again even though it may actually be empty.  Listed below are two procedures to reset the estimated ink level for the #56 and #27.