How to get out of off mode we do not use clerk#

Not sure why pressing Clerk+1 is a problem, because that is the logical way to assign a clerk to the register.

Have a read through the manual. Make sure the key is in the right mode.

https://www.manualslib.com/manual/357987/Casio-Ce-7000.html#product-TK-6500%20Series

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The training mode on the 5200 is activated using a clerk number that has been programmed to be a training clerk. To log the clerk off turn key to REG and press 0 then clerk. Then log on a clerk which isnt programmed for training - try 1 then clerk. If that doesnt work, try 2 then clerk. Clerk key is usually top right key on keyboard.

It sounds like you are not logging off first. Press 0 CLK# to log off then log a new person on eg 3 CLK# for Jane.
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wrong category

You probably changed the clerk secret code. change the code back to 1 for clerk 1, 2 for clerk 2 etc, then see if you can sign on

Hi. Error 8 usually means no clerk logged in. Type your clerk code and press your CLK# (clerk number) button to sign on. Default is 1 then CLK#

It sounds like you might have used the wrong clerk system in your MAC code. If you use a single clerk button on keyboard, you need clerk code set in the MAC code. If you use the clerk buttons at the top of the keyboard, you need to set clerk key in the MAC code. If you tell me the MAC code you used during the reset, I can see which system you are using.
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Looks like you will have to contact a Casio Authorized Dealer. Sounds like you don't have the master or owner password, therefore that would be like giving away the combination to a safe full of credit card receipts.

I think you have a clerk stock in memory . move to pgm mode 3 subtotoal o and hit clerk key then subtotal.

Hi,

Turn key to PROGRAM mode.
2 SUBTOTAL (the display should now show 'P2')
Now type the number of the clerk to change e.g to change clerk 3, press 3 on the numeric pad.
07 SUBTOTAL
Now type the new name for the clerk using the alphabet sheet (usually under your other keysheet).
CASH
SUBTOTAL

Hope this helps. If you have any trouble, just let me know.

Mark