Need to key in my specials prices have used up all 24 preset ****

check and replace your power supply

You just use one of the item buttons. Re-name it to MISC then when you use it in REG mode, type a price each time and press MISC. This is the standard way to make a MISC button Make sure you don't use a decimal point when entering prices. Hope that makes sense

No you cannot do that

INH. UNIT PR. means "Inhibit unit price". It means there is no price preprogramed for that department or PLU. Each department can be left open-priced, or preset. Open price is how you usually think of using a cash register: you enter a price, then touch the button. Preset price requires programing a price for a department in advance, but saves time in operation. You touch the Coffee button, for instance, and it automatically rings up the price you've set for a cup of coffee.
If you touch a normal, non-preset department without entering the price first, the register will error with the INH. UNIT PR message.
Touch the CLear key, enter the price, then touch the department.
Many of the Sharp registers, and I think the XE-A402 is one, allow a department to be both open and preset. It can also be programed to be inhibited completely.
The Owners Manual can be downloaded from Sharp here.

Try this: Turn key to program mode 0 CASH SUBTOTAL 3 SUBTOTAL 0 CASH SUBTOTAL
This should remove the preset amount from the CASH button. Now it should work normally when finishing the sale.
Now turn back to REG mode when entering the price, DO NOT use a decimal, so type 2000 for 20 dollars. Now press a PLU (item) button. SUBTOTAL Type the amount received (NO DECIMAL, so 5000 for 50 dollars) Press CASH Change should be displayed, and drawer open
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Looking for a manual for a Casio TE-2200, TE-2400 cash register? Go here:
http://the-checkout-tech.com/manuals/cashregisters/Casio4.php

Try this: Turn key to program mode 0 CASH SUBTOTAL 3 SUBTOTAL 0 CASH SUBTOTAL
This should remove the preset amount from the CASH button. Now it should work normally when finishing the sale.
Now turn back to REG mode when entering the price, DO NOT use a decimal, so type 2000 for 20 dollars. Now press a PLU (item) button. SUBTOTAL Type the amount received (NO DECIMAL, so 5000 for 50 dollars) Press CASH Change should be displayed, and drawer open
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If anyone needs a manual for a Casio TE-2400 cash register, go here:
http://the-checkout-tech.com/manuals/cashregisters/Casio4.php

Seems to me that if i remember right i read something that said you had to tell the machine what was taxable, as in all purchases or just some purchases and you also had to program in the tax as 7% would be .07. That's all i remember about that, but maybe this will point you in the right direction. Hope this helps

Seems like u need to re-program ur Cash Register...
before that, Please try...
1. Key turn to OFF
2. Keep pressing [Receipt Feed] button
3. Key turn to PGM
4. Release [Receipt Feed] button
5. Press [Subtotal]
6. Key turn back to REG & try to use

Yes, u need to do it in PGM3 to change price for scanning PLU. The PGM1 is for Normal PLU price change.

Of course , u can use Casio CV-10 software to do the price change too.

Hi. I'm afraid this is not a 'basic requirement' of a cash register. You are working with a very complicated area of cash registers that only the medium to high end machines can even do. If you are getting stuck already, then you will not be able to work out the more complex batch processing areas of scanning either.
Your dealer should have setup the majority of this for you before you left their store (especially the keyboard layout issue and keysheet for the keyboard), then you would normally receive extensive training if you are going to be making program changes yourself in future.
You will need to learn about the difference between flat PLUs and scanning PLUs, 'Not found PLUs' like you have run into so far, then deletion techniques, PLU status programming, manual entry using OBR method etc. The book is only a guide to what you should have learnt during training. You really need to go back to the dealer and get a training session. They should be able to sort out all of these problems for you. It will take a one on one demo to fully train the ins and outs of full scanning systems.

Mark