On a Sam4S ER-180U, the receipt printer can be switched ON/OFF in REG Mode. All reports in X/Z Mode will still print even the receipt printer has been turned off. To switch receipt printer ON or OFF there is a RCPT ON/OFF key. ( Red Key Below)

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Turn Receipt On and Off

To turn receipts off press RCPT ON/OFF once.
To turn receipt back on press RCPT ON/OFF only once again.