Panasonic stuck in self test mode

SOURCE: Stuck in self check mode

Manually pull down the front shield, then somewhat forcefully pull down the inner shield and maybe two little white pins so the tray is exposed with nothing blocking it. Have someone plug the machine in while you are holding everything out of the way and the tray should start to open. Pull your fingers out quickly so you don't block the tray from sliding out.

SOURCE: Printer stuck on Perfoming Self Test

Step1
If you're setting up the printer or changing the toner or ink cartridge for the first time, double-check the instructions to make sure that you installed the cartridge correctly and, for new printers, that you have removed all the pieces of cardboard or plastic packing material. 
Step
2
Check to see whether paper is feeding from the paper tray. If it's not leaving the tray at all, try feeding a page manually (if that's an option) or using a different paper tray. Sometimes a problem with the tray can be traced to a broken spring or a piece of plastic. 
Step
3
If paper is feeding from the tray but jamming in the printer, examine where the jam is occurring and then inspect the printer carefully to see if you can find what is causing the problem. A piece of paper, for instance, might be blocking the paper path. 
Step
4
If paper is feeding through the printer but coming out blank, check to see whether the printer is out of toner or ink. A defective toner or ink cartridge could be the problem.

SOURCE: Panasonic DMR E65 cycling in self test on start up

Check the IC in the primairy power supply,common fault.

SOURCE: 6210 Stuck in self test mode

Perform the steps provided below.

1. Unplug the power cord from the HP All-in-One.
2. Wait for 20 seconds.
3. Press and hold # and 3 while plugging in the power cord to the HP All-in-One.
4. Release the buttons after the HP All-in-One starts up.
5. The HP All-in-One will now be reset to factory defaults.

1. Press the Power button, and turn off the HP All-in-One.
2. Unplug the power cord from the wall outlet.
3. Unplug the power cord from the back of the HP All-in-One.
4. Wait for 20 seconds.
5. Plug the power cord into the wall outlet.
6. Press and hold # and 6 while plugging the power cord back into the HP All-in-One.
7. Turn on the All-in-One by pressing the Power button ( ).

SOURCE: I have a Panasonic UF-6000 stuck in self test

Unplug the machine from the rear

Hold down the ENERGY SAVER key
Plug back in while holding down the above key
Scroll down to SHIPMENT SET
press SET
press 2

Wait for the reboot