本体の分解方法を教えてください

⟐ Answer accepted 6月 21, 2026 at 19:39 GMT-7

⟐ Answered 8月 15, 2026 at 18:38 GMT-7

⟐ Answered 8月 12, 2026 at 22:41 GMT-7

I've had the bad idea to upgrade the firmware of our Epson WF-7840 (version CD17M6 now).

Now, our non epson cartridges are not recognised anymore.

I've search the web about how to downgrade the firmware. I found the procedure, found how to put the printer in "recovery mode" and, on the Epson website, I found the "Recovery Mode Firmware version CB08LC" for the Epson WF-7840.

But it doesn't work...

First problem, the model of the printer does not appear in the "Epson firmware updater" but it sees that a printer is connected.

Second problem, and it is where it stops, when I launch the Update, it fails with a message on the printer's screen "Data file not found".

I tried with my mac (macbook pro 16" m1 max) and with an older macbook pro from 2009 with the same result. I tried with another USB cable and still no luck.

What am I doing wrong?

⟐ Commented 8月 12, 2026 at 15:20 GMT-7

⟐ Answered 8月 09, 2026 at 18:57 GMT-7

Has there been any power outages in your area recently? Have you tried connecting the printer to a different outlet? Based on the symptom the printer seems to have a blown fuse in the circuitry components.

⟐ Answered 8月 09, 2026 at 7:47 GMT-7

⟐ Answered 8月 07, 2026 at 14:37 GMT-7

I have an Epson L386 printer, connected to wireless network.

Unfortunately I made a reset to router and now I don't remember my previous password.

So at this point I can't connect my printer to network. I am searching for hours, and

I still haven't figured out how can I reset my printer to factory reset, since it is not connected to network.

Any ideas?

Best regards

⟐ Commented 8月 07, 2026 at 13:25 GMT-7

I don't think there is any issue with the hardware because its printing single pages without any problem, just the duplex printing is causing problems.

I want to add to this... I am also having problem with the odd page/even page printing. Every 15 pages or so later, the printer will skip a page, thus completely disturbing the page sequence. The vendor has not been able to give any solution. Wrote to Epson, got no reply yet (it has been two weeks).

This problem is occurring in Foxit PDF reader as well as MS Word, making the printer practically useless to me.

⟐ Answered 8月 02, 2026 at 21:56 GMT-7

Hoping some could help!

⟐ Commented 8月 01, 2026 at 20:27 GMT-7

⟐ Commented 8月 01, 2026 at 2:46 GMT-7

I had cleaned the heads at least 10 times. The test page prints ok, but only.

All others print in white.

The noozle check shows yellow, cian and magenta, but no black.

Minha impressora só imprime a página de teste.

Já fiz limpeza de cabeças umas dez vezes. No Nozzle check aparecem as cores mas nada em preto.

Todas as outras tentativas a folha sai em branco.

⟐ Answered 7月 24, 2026 at 13:12 GMT-7

⟐ Answer accepted 7月 23, 2026 at 16:19 GMT-7

⟐ Answer accepted 7月 20, 2026 at 4:40 GMT-7

⟐ Commented 7月 18, 2026 at 12:45 GMT-7

⟐ Commented 7月 17, 2026 at 20:31 GMT-7

Downloaded what i could from Epson support and still the same result each time & also checked printer settings

Totally lost :-D

Any ideas ?

⟐ Edited 7月 14, 2026 at 13:14 GMT-7

⟐ Answered 7月 11, 2026 at 4:53 GMT-7

Thanks for showing an interest. Here is an overall view of a printed page

and a closer view

an alignment page

and a closer view

⟐ Commented 7月 11, 2026 at 4:19 GMT-7