MX-1800N (serv.man44). Fax Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 21

• Only one destination can be entered.

• The following functions cannot be used with direct transmission:

Programs, timer transmission, 2in1, Card Shot, Job Build, Polling Memory, File, Quick File, Two-side Scanning

• Resending will not take place when a direct transmission is not successful due to a communication error or other reason.

• If a fax transmission is already in progress when the direct transmission operation is performed, the direct transmission will 

wait until the previous transmission is finished. When the previous transmission is completed, the direct transmission will 
begin. While the direct transmission is waiting, the [JOB STATUS] key can be pressed to display the job status screen. No 
other operations are possible.

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 (page 48)