WF3530 Ribbon cable cut, where can I get a diagram and replacement?

The way these cables are integrated usually requires a new printhead mech assembly. While it can be replaced, the issue is in many cases, it’s about as much as a new printer, especially with Epson due to the permanent printhead setup.

Unless you can find a donor with a WIC error or an unrelated code, you’re usually replacing the entire printer. There is a chance the 3640 cable will work, but take it apart enough to confirm. If not, scrap this and buy a new printer.

That said, this isn’t as much of an issue with laser printers. I have an HP M401n (and a separate scanner), until the M401n started misbehaving and I looked for a replacement machine - I found an identical printer with 8,871 pages for $133 from someone who I trust to pack heavy equipment and the count is genuine. With many business lasers, you can find a replacement unit which uses your same toner cart for about as much as a low end ripoff machine :-). Now this isn't always the best option if you're just buying one but if you're happy with one you know it's worth looking. The lose-lose situation with cost is unique to inkjets, unless it’s a specialty machine like a Epson Discproducer or Rimage CD printer. I would have zero reservations about buying a HP CLJ M451dn from the same seller (with a reasonable page count) as the M401n since I know them and I'm very happy with how they perform.

Used business lasers also tend to be a good buy as well in many cases, as long as you’re aware of what you are getting. The grey area of this market is high page count (100k+), ESPECIALLY COLOR LASER. I wouldn’t be scared of a unit in the 100-150k page range, but that also means you better pay almost nothing AND be prepared to do the roller and separation pad replacement when that day comes - and on color, if the ITB has an issue, dump the printer unless you can get it for very little. The closest “like for like” to my M401n is the M404n, and that’s a Dynamic Security printer. Those things make me sick and while I didn't save much going to another M401n, it's a SureSupply printer which only nags.