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Usually those are in place with some hooks you will find parallel to the guide rails, with a spring on one side to keep it under tension.

How does your nozzle pattern check look? All nozzles cleared? If so, it seems all nozzles work great individually as shown on the test prints, but not when combining them together for a photo print. It may be that some rows of nozzles are out of alignment, you can try the alignment tool from...

Because the lines are not crossing the letters, I would doubt it is some kind of smearing. I assume the lines are parallel with the printhead direction? If so I'd think the lines are overlapping prints where there printhead changes direction and/or feeds the paper just a bit too little. You...

On the second picture I read HP7740HP7720 engraved to the mount, I'd think it might be a official HP tool? Seems a bit of an excessive mounting solution for it to be an aftermarket tool, but for a official service provider or factory it would make sense.

You need to enter the 'recovery mode' before you write can write the firmware. This guide on reddit describes the process, looking at the comments the procedure seems to work. Needless to say I found this solution as a first hit on Google, so perhaps you already found and attempted this.

I am shocked by what I'm reading, designing a board like that is downright malicious in my opinion. Not providing service tools to access the counter EEPROM is one thing, but designing the board so it cannot be erased with software is something else. Thank you for the detailed write up even...

I can confirm that the stock Ender3 KE (same extrusion and hotend) does print PETG great. I've never used ABS myself but I know it can be tricky without an enclosure, both for health and warping reasons. I eventually upgraded both the extruder housing & wheels to allow for more aggressive...

You can typically use pigment inks in dye printers and vice versa, but there’s plenty of variables that could cause issues or even break your hardware. How well the ink settles to the paper has mostly to do with the paper/ink quality and type, not so much with the printer itself. Additionally...

Well then, my praises of Brother aged poorly it seems :lol:

The sensor on that board might be broken, maybe there is some other broken part somewhere, honestly could still be many reasons. If I was working on that printer I’d think that sensor board faulty, and look for a replacement part. Yet I would not have been surprised if that doesn’t solve...

You can check the list for supported instruments on Argyll, recently got a ES-1000 and had no issues calibrating and profiling using GUI DisplayCAL or command line Argyll. It is not fool proof or intuitive at all, so it requires some reading and getting used to, or past experience to operate...

Just glue wouldn't repair the broken traces, but you could potentially repair this board by adding bridge wires to the solder points over the broken area. It's a single sided PCB so you can follow the traces by eye going from solder point to solder point. Obviously replacing the board would be...

OrcaSlicer is a fork of Bambu Studio, which is a fork of Prusaslicer. I tried Orca when the scarf joints were introduced, and I was impressed by the performance. That feature may or may not have been introduced elsewhere since then. In the past I've heard people say some algorithms in Cura are...

Generally speaking I would think a printer in the same series/time frame could share the same display unit, as it would be way cheaper for Brother to order from a LCD manufacturer in bulk rather than designing something different for each machine they produce. I also doubt the (custom ordered)...

It is really up to experimentation with the unknown solution and raw materials the factory uses. As far as I understand it pigment inks are a bit more difficult to manufacture because of the pigments themselves. The big firms ground their own, and obviously know the ideal mixture for a certain...

I doubt it would be worth your time, as much as I love to use and maintain retro hardware sometimes you got to bite the bullet and move on. Some parts and things like gaskets, glue, lubrication etc could be too worn or degraded to fulfill their function, even though they look visually OK. If you...

As far as my knowledge goes, water based print ink commonly has a very slight amount of biocides as an additive to prevent mould and other life from inhabiting the solution. If you are sure that it is mould, perhaps the aftermarket ink you used before didn’t contain it or in too slight amounts...

In my opinion and experience Brother is THE best manufacturer in terms of price, support and features for office applications. I haven't had much experience with their inkjet printers though. This became very apparent to me when looking for a new document scanner for one of my clients in the...

Good luck, I'm interested in your results. As a note for your experiments, the various inks Epson produces differ 'somewhat' in composition. You can find the differences in their safety data sheets.

For the sake of crossing potential causes off the list, and I didn't read you mentioned it, are you certain it is not caused by software? If not, you could try a print from another device with freshly installed drivers, before you continue with the hardware troubleshooting.