本体の分解方法を教えてください

⟐ Answered 11月 17, 2025 at 22:46 GMT-7

⟐ Commented 6月 11, 2026 at 3:12 GMT-7

The paper starts to feed and then never quite gets grabbed coming out of the paper tray. It doesn't jam, it just doesn't feed. When I feed manually, the printer works fine, but that is a royal pain!

I have tried cleaning all the rollers underneath - in back and front.

Other suggestions?

⟐ Commented 6月 10, 2026 at 23:50 GMT-7

⟐ Commented 6月 10, 2026 at 19:51 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 6月 10, 2026 at 16:40 GMT-7

⟐ Answered 6月 10, 2026 at 15:46 GMT-7

⟐ Commented 6月 10, 2026 at 13:37 GMT-7

1.     When I print a document with more than one page using the 2-sided print feature it prints on two sides, but the second side prints upside down.  I’ve checked all the printer properties and can see nothing untoward.

2.     When I launch Brother Utilities, and click on the Status Monitor icon nothing happens

⟐ Commented 6月 09, 2026 at 5:11 GMT-7

Here is other messages that shows on the printer

1. Ink Cartridge(s) Problem The following Ink Cartridges must be replaced. I have brand new ink cartridges.

2. It was printing about 2 weeks ago, when I replaced the empty ink cartridge. Then, it stopped. I called HP and they sent another one. Now, it will not accept the new cartridge. 

3. I have downloaded print drivers from HP.com and I have uninstalled and reinstalled the printer software about 4x.

⟐ Answered 6月 09, 2026 at 1:50 GMT-7

⟐ Answer edited 6月 07, 2026 at 13:58 GMT-7

⟐ Answer edited 6月 07, 2026 at 12:39 GMT-7

Please Guide,

⟐ Answered 6月 06, 2026 at 8:20 GMT-7

We have a small torsion spring which we don't know where it goes. I think I can find it, but man if someone had any guides, manuals, videos, etc. of a teardown and reassembly I could watch...

We don't have $500 to replace it but we definitely have need to use it soon.

I'm absolutely shocked at how thoroughly this nasty green chemical completely lined the entire inside of this printer.

⟐ Answered 6月 04, 2026 at 5:38 GMT-7

I bought the HP OfficeJet Pro 8620 printer in 2015 and up until december 2019 it has worked perfectly. One day out of the blue, I recieved this error message: “The printhead appears to be missing, not detected, or incorrectly installed. Error code 0xc19a0023" . I reseated the printhead one time and the printer worked until next day, when the same error appeared. I followed HP’s troubleshooting steps 1. reset printer 2. reseat printhead 3 times 3. updating firmware, but no luck. I’ve disassembled the printhead and cleaned the contacts on PC board. I ordered this cleaning solution and cleaned the printhead, both soaking in the solution for some time and pushing the solution through. No luck. I then went on to buy this new print head from eBay, but the new one instantly gave the same error message.

Then I continued to troubleshoot some more. Since the new printhead failed I thought maybe the problem is in the printhead carriage inside the printer. I disassembled it and cleaned the contacts on the PC board. (This one is also possible to buy on aliexpress , but I’ve not done it). Everything looks ok. All the pins are undamaged. I’ve reset the CMOS battery on the main board, disconnected all cables and checked the cables specificly for the printhead carriage. I don’t have the equipment or knowledge to test if the cables actually work, but everything looks ok. Still getting the error message.

One last thing that I came by today on this page is that it might be the unoriginal ink that I installed for the first time last time I replaced my cartridges (about 3 months ago, I switched the last color from original HP to unoriginal). Could it really be the problem? Is it still worth a try to buy new original HP cartridges and will it even fix the problem? Or is the damage done already and not reversable? I’m a bit hesitant to invest more on this printer since I already blew up 72 EUR for the printhead…. Returning the printhead to China from where I live costs almost 40 EUR so it’s not worth the refund.

EDIT: I found an official statement from HP about a new firmware update removing Dynamic Security Feature which makes the printer fail when unoriginal ink is installed. However they explicitly say it’s only connected to a cartridge error message. Other error messages are not related. So in theory I’ve already solved this issue, when I updated my printer to the newest firmware early in the troubleshooting process. Both printheads give the same error message. This decreses my belief in buying new original ink to fix the problem…

EDIT 2: I found the old original HP empty cartridges I had before and installed them just to see if it would remove the error, but it didn’t. So now I don’t have to waste money on buying new ink at least…

Or am I missing something else? Thanks for helping out!

⟐ Answered 6月 04, 2026 at 2:04 GMT-7

I removed the empty cartridges (cyan, magenta and yellow were low), shook all of the cartridges, pulled off the tape cover and installed the cyan, magenta and yellow cartridges.

The cyan ink cartridge was the only cartridge that could not be recognized at that time.

So, I reseated the cyan cartridge. I still got the message that it wasn’t recognized.

Then I reseated the cyan cartridge again. I still got the message that it wasn’t recognized.

So then, I power cycled the printer.

I turned the printer off, I unplugged the printer from the wall, and I unplugged the power cord from the printer for a complete power cycle for about 5 minutes.

I plugged the power cord into the printer, plugged the cord into the wall outlet and turned on the power button.

That did not solve the problem.

I went to the Epson Support Services site and other internet sites and saw tips for solving this problem.

I followed the instructions on the Epson site, which were the same steps that I had tried as I mentioned above, but this time, I used a soft cloth to clean the cyan connections on the cartridge and in the cartridge carriage and I checked each cartridge to make sure the gold colored chip was on the cartridges. They all have the gold colored chip.

It didn’t fix the problem.

Then I saw a tip that said that installing firmware would fix some problems with the printer.

So I entered my printer information and was returned a download of firmware for my printer.

The firmware installed successfully.

Now, the black ink cartridge that had been working is no longer being recognized along with the cyan ink cartridge.

It seems when you install a defective cartridge and then take it out, the cartridge carriage in the printer becomes “unture” and if that’s not the case, then the problem has to be with the firmware or maybe both.

Something in the printer seems to get set when you install and then remove a defective cartridge. Somehow there is no way for the printer to reset itself to accept another cartridge install.

How do you make the printer "un-remember" the removed cartridge?

So now what do I do? How can I fix this problem?

⟐ Commented 6月 01, 2026 at 15:09 GMT-7