Our brother intellifax 4750e fax machine will not

MAYBE LASERUNIT PRBLM

Hi Deanna, unfortunately it is not possible on this unit to have the date and time stamped as that is produced by the senders machine, this feature is referred to as the station ID on your brother machine.

CRC error in answerback. It means the error correction digits didn't match the data that was sent. I've seen a few cases where this was bad phone line conditions - once I could see the phone lines scraping against the gutters in the storm outside the window - but usually it's a flaky Main Board in the fax.
Unplugging all the cables on the board and plugging them back in might clean a bad connection, but we're seldom that lucky.

There are a few possibilities. 1) The phone cord coming from the wall is plugged into the phone port on the fax instead of the Line port. It should be on the line port.
2) The fax have been set for distinctive ring. This causes the fax to ignore the normal incoming ring tone and is instead waiting for the distinctive ring from the phone co.
3) The modem in the fax has gone bad. If you have had any power failures or electrical storms/problems this is a possible cause.
Some models will also not answer if the machine is out of toner or paper.

To set up for receiving Fax, do the following:
Press Mode button repeatedly untin Fax and Fax/Tel lights are lit.
Faxes will automatically print and answering machine will take the calls. If you have a dedicated fax line, do the following:
Press Mode button repeatedly until just the FAX light is lit. Then the machine will answer every call as a fax.

try installing a line filter

Open up the doc feeder and clean the scanner glass

Your scanner block has a loose connection or it is bad.

The drum is scratch ,or there is a paper jammed .

Make sure that the phone line is pluged into line on fax machine and not ext.