I would like to input cash amounts for items that

Hi. It is a printer error. Check printers and connections.

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For those who have been asking, one of the users has the Casio QT-6000 manuals here:
https://the-checkout-tech.com/manuals/cashregisters/Casio4.php

ERROR wrong operator, Error clerk/Error clerk in check tracking
input correct check number or assign the proper clerk. That clerk was not assigned that range of checks

http://totalpos.co.nz/wp-content/uploads/2012/10/QT6000REF_E060915D.pdf

Mode PGM 3
Clerks
pick the clerk you want to use
Put you new name in the the description
you might need a number
them ESC all the way out
now Mode REG

job done

you can reset the time and attendance with in Z mode

reset the table and all should be ok

RE-assign your clerks and log in

The cash register has lost it's setting, check to see if it has a backup battery probably exhausted.

Sounds like the battery may not have been replaced on time. If so, it will have lost all programming. Best to see a dealer about this problem. ---------------------------------------------------
If anyone needs more information, The Casio QT series manuals are here:
QT-6000 programming manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6000_programming_manual.html
QT-6000 Reference manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6000_reference_manual.html
QT-6000 Users manual http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6000_users_manual.html
QT-6100 Programming manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6100_programming_manual.html
QT-6100 Reference manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6100_reference_manual.html
QT-6600 Programming manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_QT-6600_Programming_manual.html

1. Press [Mode]
2. Press [PGM1]
3. Input current time (in 24hours format, eg 9:30pm = 2130)
4. Press [X/Date time]

I am not personally familiar with this product, but i have located a manual that details basic and advanced programming features for your model.

Right-Click the link, and select " Save As " and save it to your desktop or other useful location.

(PDF)Casio QT-6000 Manual