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how to troubleshoot brother 7820n scan check cable error

1. push the scan button on the printer
2. error "check cable"
3. but i can print, and i can access printer web page - printer ip is 192.168.1.11
4. run installation check - show scanner ip as 192.168.1.7 - dhcp changed
5. install check said to check control panel scanners and cameras
6. get properties on brother mfc-7820n lan - in network setting - specify machine by address was using old address - i changed it to specify machine by name so future ip changes won't impair printing
7. all is working

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