Electronics Repair Questions? Ask an Electronics Technician
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First, try unplugging the register from the power. Leave it that way, unplugged, for at least 20 minutes. Then after that, turn the key to turn it Off, then after that, plug it in to power again. Try turning it On, see if it now comes up and responds normally.
There may be more to try, so if that does not work, let me know, and I will suggest further possible remedies.
OK... I was rather suspecting it would not. But it had to be tried, once. Now: what shows up on the register's display, exactly, at this time?
Have you tried using the master or manager key to do a keyed reset? it might erase all transactions.
It might also erase all programming... you would have to set up the initial setup and programming on the register again... would that be OK?
Unplug it from power, remove batteries, turn key to REG position.
Plug in again this way... and the display should show "L 000", or something very similar. If so, it was reset successfully.
Try it again - make sure there are no batteries in it first. Unplug it for longer than 5 minutes, before trying it again, also.
Well. I don't know what further to suggest, except that, if your register was not plugged into power through a surge protector, you may have a 'broken' register, perhaps owing to a power fluctuation or surge affecting it during that transaction in which it locked up.
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Very well. Good luck with it, and I'm sorry the conclusion wasn't any better.