I had the error message L-4 .can you halp to fix this problem?

There does not appear to be a single solution that always fixes this error message. For some users, procedures for cleaning the nozzles works. For others, switching the particular software program you are attempting to print with works. For a considerable number, contacting epson about your warranty (a year) yields a replacement printer being shipped. The approach from Epson for tackling this problem appears to be powering the printer off, detaching peripherals, reseating cartridges, waiting 5 minutes, an re-powering. Here is a link offering variations of this: https://tonixcomp.net/epson-error-code-0x97/

Which ever fix is employed, the ones which do NOT work include replacement of drivers, scanning for viruses, and firmware updates. Hope this saves you some time. I also note that this error message is not confined to a single epson model but it is generally a good thing to supply that model number as well as your OS when researching a problem.

press the start button (big green button) , to see the next part of the error code ,
a simple reset should be able to fix this , so depending on your copier model, and the rest of your code ..........

If you are receiving this error, you should run the Microsoft patch (KB884020) for it. Follow the instructions below to do this. Alternatively, you can download a zip file with the patch, registry file,.
1) Download the patch from Microsoft's site
2) Run the update to install it
3) Run this short Registry fix to complete the update. Type the following lines in Notepad and save the file as FixReg.reg on your desktop, then double click on it to install into your registry.
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec]
"AssumeUDPEncapsulationContextOnSendRule"=dword:00000002
4) Reboot your computer
If you experience the error message again, reboot your computer first. In most cases this will solve many connectivity issues that are not associated with this SP2 bug.

7 blinks followed by a pause and repetitive 7 blinks problelm fixed by alternatively toggling between "heated dry" and "normal buttons within 6 seconds

Follow this document

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00310229&cc=us&lc=en&dlc=en&product=91463

After following the document if the issue is not fixed, try this final step

1. Disconnected power cord from back of printer ( while printer is Power on)
2. Press and Hold # and 6 Button together
3. While holding the button, connect the power cord
4. Leave the #6 button after 5 seconds.
5. Follow the instructions to align the printer.

( Hopefully this should fix the issue, else consider your printer as broken unit which cannot be fixed )

If you still get the error message, Your printer is broken. Contact www.hp.com/support and enter 7140xi in product and choose chat or email to let HP know the issue.

My plasma display the "error message condition 1" and red flashing light start blinking and TV screen shut down. Who can halp me to fix the problem??

L1-00 is a mirror base feed trouble. Make sure the scanner mirrors move freely. Check for a scanner lock usually underneath the scanner frame to make sure the mirrors aren't "locked". otherwise check the cables and belts in the optics section but do NOT didassemble them without experience doing so. Lubricate scanner rails. Usually caused by accidental scanner lock engagement.

try this reset procedure. Most likely this will work.

Performing a Fault Reset 14 will reset your WorkCentre and will help to clear error codes.

1. Find the pink Clear button on the Control Panel of the WorkCentre.
2. Find the button below the word Auto.
3. Press these buttons in the following sequence: [Clear], [Auto], [Clear], [Auto] NOTE: All of the lights on the Control Panel should go out and the LED Display should go blank. If the lights do not go out, then repeat step 3 until they do. It may be necessary to increase or decrease the pace of the [Clear], [Auto], [Clear], [Auto] sequence.
   
4. Press the [10's] key one time and the [1's] key four times to enter '14' in the LED Display, as if you were to make 14 copies.
5. Press the green [Start] button.
6. Press the pink [Clear] button two times.
7. The WorkCentre should now warm up and come to ready.
8. If the above steps do not clear the error code, repeat steps 3 to 6 a second time.

fuser error - needs a tec - heater lamp, thermal fuse or thermister is broke. No simple fix