Check you paper path ways by using paper path cleaner (its rough paper that cleanse the inside of your printer. Use this tip only if it's a laser fax machine.
If not (inkjet) then you may have an issue with either the commands on the fax machine or a defect on the motherboard internaly (which either needs to be replaced)
Try the cleaning method above for inkjet (just in case)
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Check you paper path ways by using paper path cleaner (its rough paper that cleanse the inside of your printer. Use this tip only if it's a laser fax machine.
If not (inkjet) then you may have an issue with either the commands on the fax machine or a defect on the motherboard internaly (which either needs to be replaced)
Try the cleaning method above for inkjet (just in case)