I have a 700ml cartridge for VLM that I used for years (2011-2016) in a 7900. I traded the (dead) 7900 for a (dead) 9900 last year. Since it was dead, I didn’t get around to working on it until last month. At that point, the VLM didn’t register in the 9900 - it doesn’t think there’s a cart in the slot. Since it had worked for years, I assumed that the chip had gone on the fritz. Well, the new chip came, I installed it - and no luck. The printer still doesn’t see anything in that channel.
So I put my Piezoflush cart for that channel in - success. An old - very empty - Epson 350ml cart also registers, albeit empty. So I think the printer is probably fine.
What else should I check on the failing 700ml cart with either original or replaced chip? I don’t like the chances of both the old and new chip being non-functional, so I am inclined to think that there’s something goofy with the cart itself. Of course I can’t realistically check the clearances and contact point of the cart while it’s in the printer.
This definitely isn’t a life-or-death situation. This 9900 is about to be converted to Piezography and the only reason for putting an ink-ful VLM in this printer at all is to verify that the channel is clear, which it has been all along aside from the usual not-used-in-months clogs.