thanks Mark
it could be an absolute bargain, but wary of it being a money pit (I wouldnt want to be paying $000's for technician to replace the heads etc.)
my trouble is, I used to be a computer engineer plus I own old classic cars, so have an attitude of "I could probably fix that"
I am likewise blessed (?cursed?) with the same attitude that once led me back in the late 50's to install a free, but untested WWII surplus Harley V-2 25HP motorcycle engine in a little 12' speed boat I had rebuilt, inventing (or re-inventing) the "V-drive" with engine facing forward, in the process. I had no doubt it would work, and it did, with twin un-muffled exhaust pipes out the transom, sounding like the hounds of hell were coming! Unfortunately, it ran about three MPH slower than the old Evinrude 15 outboard it replaced, and I ran out of money before getting the optimum propeller/drive ratio sorted out. But the process itself was worth it.
Fast forward to last year when my 4 year old Canon iPF5100 threw a paper sensor error code after refusing to print. Yeah, I can fix that little problem! After a half-day disassembly to expose the sensor and replace it, then buttoning things up and re-starting, not only a sensor error, but two others, including a head error. Rather than plunge on with the service manual, I knew I had met my match, consigned it to the electronics graveyard after harvesting inks, roll spindle, and cassette tray, and ordered a new one. The $1500 price (free delivery, no tax) was identical to the retail value of the $600 worth of the twelve 90ml starter carts, and the two new printheads at $450 each.
Lesson learned: Few things in our lives are as complex as the microsecond choreography of even the most basic inkjet printhead's dance across the page while laying down thousands of precise dots per second. And a single failure will often be followed by a concatenation of interrelated problems.
There's an instructive enormous thread several years past in this forum, of 80+ pages, regarding the rehab of the 9900's little brother 7900. Reading this, I think, would discourage even the most fervent DIY'er from the seduction of a long dormant, unproven LF printer. Anyone with the link?