Why Does My Register Doing A Solid Beep When Plugged In And Key Turned To Reg ?

Most Sharp register, including the ER-A420, have a rechargeable battery mounted inside to hold all memory when the power goes out. It should last a few months, but two years is a bit much. This might get it going:

1. Unplug from AC POWER.
2. Turn the key to PGM.
3. Hold down both paper feed keys (at top-left of keyboard).
4. While holding those two buttons down, plug the power back in.
5. Turn the key back to REG.
6. Enter 1 CASH # to sign on as Cashier 1.
7. Try a sale.

There is a strong chance this won't do the job, because the memory has been randomized by total loss of power when the battery died. Worse yet, the battery may be too far gone to ever take a solid charge again. If so, you probably need the help of a Sharp register dealer to replace the battery, totally clear all memory and reprogram it. It's probably worth the money; the -420 is an excellent little register.

https://www.fixya.com/support/t27334823-er_a320_sharp_register_beeps_keys_dont

Thanks

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Troublshooter101