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This means that your Brother machine experienced a communications error when sending or receiving a FAX. This is generally caused by either interference on the line, phone line connection or another device on the line.
Try resending the documents and see if the message no longer appears.
Verify that the Brother printer is in the list. If the Brother printer is listed, continue to step 4. If the Brother printer is not listed, the driver may not be installed properly. Skip to PART 8 to reinstall the Brother driver. Verify that the Brother printer is set as default. This is especially important if you use the print icon to. If 'Unable to Init. 4F' is still on the display, go to step 11. If 'Unable to Init. 4F' has cleared, go to step 12. Unplug the machine from the power outlet for approximately one-minute, then plug it back in. If 'Unable to Init. 4F' still on the display, go to step 13. If 'Unable to Init. 4F' has cleared, go to step 12.
If the message still appears, there may be a problem with the way the Brother machine is connected or you may have a bad telephone line. Disconnect any other equipment on the telephone line, i.e. answering machine, modem, extra telephones, switching devices, adapters, etc. Make sure the telephone line is connected directly from the jack (socket) on the Brother machine labeled 'Line' to the telephone wall jack (socket).
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Try resending again. If the transmission is successful, the problem was created by the connection of the Brother machine and the other devices on the line. Reconnect the other pieces of equipment one at a time to see which is causing the problem. If the error continues to appear on the report, try connecting the Brother machine to a different telephone line or have the line checked by the telephone company.
Although the Brother MFC-6490CW can be used in a both wired and wireless network, only one of the connection methods can be used at a time. Page 31 For Wireless Network Users Confirm your network environment (Infrastructure Mode) The following instructions will offer two methods for installing your Brother machine in a wireless network environment. I have a Brother MFC-6490CW. I got the message: Unable to init. I checked for for foreign object inside; nothing - Answered by a verified Technician.
Brother Mfc 6490cw User Manual
Brother Mfc 6490cw Printer
To protect your investment against power surges and lighting, Brother strongly recommends that you connect your machine to a surge protector. In particular we suggest that you use a surge protector that is compatible with both standard AC power cords and telephone line cords. Surge protectors equipped with telephone jacks (sockets) will assist in insulating your machine from any power surge that might travel through a telephone line.