Sindoh M612 - Manual (Page 212)

Settings and changes of each function and additional functions
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4 After setting in details including receiver`s number, place A3 original on the flatbed and press【A3 Start】 or
[【Start】 button.
(The original size is fixed to A3. In order to change the original size and make a fax, you have to work in
general mode by pressing 【Fax】 button in the home screen.)