Fax (facsimile) machines are common telecommunication instruments for transmitting and receiving long distance static images, forms and documents by way of wire or wireless transmission mode. At the transmitting terminal, the transmitter of the fax machines scans an original document, transmits an image of the document to a remote fax receiver which reproduces the received image on a printer of the receiver. Fax machines have come into widespread use in the past several years as a convenient means for transmitting written information. Facsimile machines operate by encoding an image on a paper into a series of tones that are then transmitted over the telephone network to a receiving facsimile machine. The receiving facsimile machine decodes the transmitted message and reconstructs the image. Facsimile machines have various functions, such as an image capturing function, a printing function, a communication function, a multi-copying function, an auto-answer function, a memory transmission function, and a scheduled/delayed transmission function. A fax machine comprises a feed roller driven to feed sheets of paper individually, and a transmission roller driven to deliver fed sheet of paper at a higher speed. Most facsimile (fax) machines today have the capability to warn the user when the end of the paper roll is near or the paper has been exhausted. This warning is done through audible alarms and/or display messages on the fax machine. Facsimile machines have internal memory used for purposes such as transmit and receive buffering, and storing image data while the data are being coded and decoded. Most facsimile machines have two modes of operation: a main operating mode and a standby mode. In the main operating mode, power is supplied to the facsimile machine by a main power supply for performing all functions. In the standby mode, the main power supply is de-energized to conserve power and to extend the life of various parts and equipment in the facsimile machine. Most facsimile machines include a microprocessor-based controller that monitors various inputs and controls the overall operation of the facsimile machine.
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