Brother DCP375CW - Troubleshooting Based on Problem Type; 1 ] Control Panel and LCD Problems; 2 ] Fax;Telephone Problems (for MFC Only)

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4.2.4 Troubleshooting Based on Problem Type
[ 1 ] Control panel and LCD problems
[ 2 ] FAX/Telephone problems (For MFC only)
* For models with handset
Problem Check:
(1) LCD shows nothing. • LCD and its flat cable
• Panel-main harness
• Control panel PCB-to-PCB harness (for models with touch
panel)
• Control panel PCB
• Power supply PCB
• Main PCB
(2) Control panel inoperative. • Panel-main harness
• Control panel PCB
• Rubber keypads
• Main PCB
(3) Touch panel inoperative. • Adjust the touch panel with Function code 78 in the
maintenance mode. (Refer to Chapter 9, Section 9.4.28.)
• Touch panel harness
• Touch panel relay PCB (in the LCD unit)
• LCD unit
• Main PCB
Problem Check:
(1) No faxes will be able to be sent. • Hook switch*
• Rubber keypads
• Control panel PCB
• Main PCB
• MJ PCB
(2) Speed dialing will not work. • Ordinary dialing function
If it works normally, check the main PCB; if not, refer to item
(1) above.
(3) Dial does not switch between
tone and pulse.
• Main PCB
(4) The ringer does not sound. • Speaker harness
• Speaker
• Main PCB
• MJ PCB
(5) No phone call can be made with
the handset.*
• Curled cord
• Handset
• Hook switch PCB
• Main PCB