Brother MFC-9840CDW, DCP-9045CDN Speaker is silent during on-hookdialing, Dialing function does not switch between "tone" and "pulse

Speaker is silent during on-hook dialing.

Step	Possible cause	Check	Result	Remedy
1	Connection	Are the main PCB and	No	Reconnect the connector
	between main	speaker connected		properly.
	PCB and speaker	properly?
2	Speaker	Is the problem solved	Yes	Replace the Speaker.
		after replacing the
		speaker?
3	Connection	Are the main PCB and	No	Reconnect the connector
	between main	NCU PCB connected		properly.
	PCB and NCU	properly?
	PCB
4	Harness between	Is the harness damaged?	Yes	Replace the harness with
	main PCB and			a normal one.
	NCU PCB
5	Connection	Are the main PCB and	No	Reconnect the connector
	between main	control panel PCB		properly.
	PCB and control	connected properly?
	panel PCB
6	Harness between	Is the harness damaged?	Yes	Replace the harness with
	main PCB and			a normal one.
	control panel PCB
7	NCU PCB	Is the problem solved	Yes	Replace the NCU PCB
		after replacing the NCU		ASSY.
		PCB ASSY?
8	Main PCB	Is the problem solved	Yes	Replace the main PCB
		after replacing the main		ASSY.
		PCB ASSY?

Dialing function does not switch between "tone" and "pulse".

Step	Possible cause	Check	Result	Remedy
1	Connection	Are the main PCB and	No	Reconnect the connector
	between main	NCU PCB connected		properly.
	PCB and NCU	properly?
	PCB
2	Harness between	Is the harness damaged?	Yes	Replace the harness with
	main PCB and			a normal one.
	NCU PCB
3	NCU PCB	Is the problem solved	Yes	Replace the NCU PCB
		after replacing the NCU		ASSY.
		PCB ASSY?
4	Main PCB	Is the problem solved	Yes	Replace the main PCB
		after replacing the main		ASSY.
		PCB ASSY?

1-69 Confidential