HP Photosmart 3210 Inkjet Printer Head Repair and Cleaning

After I repaired it, one of my cartridges went empty. I got the dreaded, non-resettable, "ink system has failed error 0xc18a0206", which is misleading printer techno-babble for: your cartridge is empty sooner than I expected. Not shown in the video, see instructions below on how to clear this. To clear the infamous "ink system has failed 0xc18a0206" error message (provided you unclogged the heads beforehand as in the video): hold cancel and OK while you power down, and keep holding while you power back up until it eventually powers down again. Then press power on, you'll enter the OOB NVRAM reset and launch a long clean and reset of the inkjet system. If the system is unclogged, the crippling error will be cleared. So here are some secret key combinations for the HP 3210 and related units: Advanced firmware menus access: press the left and right arrows together. Then enter one of three codes: 1,2,3 1,2,4 1,2,7 Each leads to a different advanced firmware menu which you can navigate using the left and right arrow , OK and cancel keys. You can even restart the machine in manufacturing maintenance mode (at your own risk, I did not try).