E34 message when pressing dept 9 key

It sounds like you are seeing the time display. Turn the key to REG mode and try pressing CL (clear). If it doesn't beep, get the keyboard checked by a technician

It's an operation error. You have pressed a wrong sequence. Most common reason is using a decimal point in prices.
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If anyone needs a Sharp XE-A20S manual, one of the users has it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A20S_operating_programming_manual.html

It's an operation error. You have pressed a wrong sequence. Most common reason is using a decimal point in prices. Leave out the point and try again.
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If anyone needs a Sharp XE-A20S manual, one of the users has it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A20S_operating_programming_manual.html

That machine uses a thermal paper only. and only print on one side

You have two different errors. "PPPPPPPP" means the printer has run out of paper. Change the paper roll then press clear (CL). "E32" means you have logged off and no one has logged on to use the machine. Enter your log on code and then press CLK#.If you need a manual for the XE-A20s, one of our users has it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A20S_operating_programming_manual.html

wrong category

The other departments or PLUs have not had tax selected. If you look in dept and PLU programming, you will find an option to apply TAX1, TAX2 etc.

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If anyone needs a manual for a Sharp XE-A20s, there is one here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A20S_operating_programming_manual.html

That is strange. You may have had the clerk sign on codes changed by someone. Make sure you are using the CLK# button at the top of the keyboard next to DEPT SHIFT button. Make sure the key is turned to REG position. If 1 CLK# doesn't work, try 2 CLK# or 9 CLK# Most machines will print the clerk number on the display once you enter it correctly e.g "-01-"
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If anyone needs more information, the Sharp XE-A40s cash register manual is here: http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A40S_operation_programming_manual.html

try the link below
http://www.giveawayoftheday.com/sharp+xe+a20s+pc+link/

Hi.
Yes you are right. you have logged yourself out of the machine. it is telling you to log back in.

Press 1 then CLK# or CASH#

Mark