Troubleshooting Based On Problem Type; 1 ] Control Panel And Lcd Problems; 2 ] Fax Problems; 3 ] Communications Problems - Brother MFC5490CN Service Manual

4.2.4 Troubleshooting Based on Problem Type

[ 1 ] Control panel and LCD problems

Problem
(1) LCD shows nothing.
(2) Control panel inoperative.

[ 2 ] FAX problems

Problem
(1) No faxes will be able to be sent.
(2) Speed dialing will not work.
(3) Dial does not switch between
tone and pulse.
(4) The ringer does not sound.

[ 3 ] Communications problems

Problem
(1) No tone is transmitted.
• LCD and its flat cable
• Panel-main harness
• Control panel PCB
• Power supply PCB
• Main PCB
• Panel-main harness
• Control panel PCB
• Rubber keypads
• Main PCB
• Rubber keypads
• Control panel PCB
• Main PCB
• MJ PCB
• Ordinary dialing function
If it works normally, check the main PCB; if not, refer to item
(1) above.
• Main PCB
• Speaker
• Main PCB
• MJ PCB
• Main PCB
• MJ PCB
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