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Code M2 means your photocopier machine require maintenance.In maintenance some old parts of your machine will be replaced with the new one and all this will be performed by technical services representative.
Since this appears to be a non-US model I can only base my response on the closest US body type AR-M237.
U2-40 means the countdown (CRUM) chip in your toner cartridge either broke or went to zero. If you can put in a fresh CRUM chip in your cartridge, that's great, otherwise you'll have to replace the toner cartridge.
L4-01 means main motor lock, probably due to a brownout or otherwise missed timing. You can probably get by with a power off and on. Not sharing your copier with other devices on the same outlet will also help here.
To reset error codes, put the machine in test mode with the four-key combo: # - * - C - * ... 16-Start clears your U2 trouble, 14-Start and 17-Start clear the rest. Then hit CA and allow your copier to reboot. Good luck!
open the front cover. remove the toner cartridge/s by lifting the green lever and pulling the toner out. Open the left side door. look at where you just pulled out the toner and there is one screw (facing you) holding each drum in place - loosen the screw and pull the drum out towards you....done.
Possible bind in one or more of the developer units. Replace as needed.
Sec. 11 Page 11-61 it talks about Paper Feed Drive Motor, it is the
same motor as the Black Developer Drive Motor.
For L4-04 swap those two motors around to troubleshoot bad motor
There is a long list here for the U2 code so if you let me know I will tell you what it means..
Again what is the Last part of the Code?
If it is U2-40 code, it is a Crum Chip, Take the toner out clean the end of the toner cartridge, there is a chip, a small plastic connection piece with bronze/silver wire on it.
Or replace the toner cartridge.
You will also need to clear the code with simulation 16.
Turning the machine off might work but, not usually.
Performing a Fault Reset 14 will reset your WorkCentre and will help to clear error codes.
Find the pink Clear button on the Control Panel of the WorkCentre.
Find the button below the word Auto.
Press these buttons in the following sequence: [Clear], [Auto], [Clear], [Auto]
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.
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.
Press the green [Start] button.
Press the pink [Clear] button two times.
The WorkCentre should now warm up and come to ready.
If the above steps do not clear the error code, repeat steps 3 to 6 a second time.