The red light on the printer beneath the ink drop remains lit, and I cannot recall if this is normal or not.
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Dave,
What red light are you referring to here? On my 2200 the only lights are the following: (1) power light in the middle of the power button (steady when on but not printing, blinking when printing), (2) light in the middle of the paper feed button (comes on when there is a paper jam), and (3) the seven red lights that each sit directly in front of one of the ink cartridges. There are no lights (on my 2200) on or near either the roll-feed button or the ink-drop button.
If the red light is the one next to the black cartridge, then, since you have swapped the MK and PK a few times, it sounds to me as if the chips on the cartridges aren't making good contact with the contacts on the printer. If this is the case, and you want to take the chance, you might try cleaning those contacts with rubbing alcohol on a Q-tip (very carefully so as not to bend the contacts or get alcohol or lint into the ink nozzle. Take the cartridge out first and use a good light to see the contacts behind its socket.
I have not tried this myself, so I make no guarantees. But it
might work, and if it does, it's less expensive than an overhaul. If this doesn't work, there may be something more seriously wrong.
Good luck!