Brother International MFC 8890DW Service Manual - Page 144
Speaker is silent during on-hook dialing., Dialing function does not switch between tone and
UPC - 012502622673
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■ Speaker is silent during on-hook dialing. Step 1 2 3 4 5 6 Possible cause Connection between main PCB and speaker Speaker Connection between main PCB and NCU PCB Harness between main PCB and NCU PCB Connection between main PCB and control panel PCB Harness between main PCB and control panel PCB Check Are the main PCB and speaker connected properly? Is the problem solved after replacing the speaker? Are the main PCB and NCU PCB connected properly? Is the harness damaged? Are the main PCB and control panel PCB connected properly? Is the harness damaged? Result Remedy Reconnect the connector No properly. Replace the Speaker. Yes Reconnect the connector No properly. Replace the harness with a Yes normal one. Reconnect the connector No properly. Replace the harness with a Yes normal one. NCU PCB 7 Main PCB 8 Is the problem solved after replacing the NCU PCB ASSY? Is the problem solved after replacing the main PCB ASSY? Replace the NCU PCB Yes ASSY. Replace the main PCB Yes ASSY. ■ Dialing function does not switch between "tone" and "pulse". Step 1 2 3 4 Possible cause Connection between main PCB and NCU PCB Harness between main PCB and NCU PCB NCU PCB Main PCB Check Are the main PCB and NCU PCB connected properly? Result Remedy Reconnect the connector No properly. Is the harness damaged? Replace the harness with a Yes normal one. Is the problem solved after replacing the NCU PCB ASSY? Is the problem solved after replacing the main PCB ASSY? Replace the NCU PCB Yes ASSY. Replace the main PCB Yes ASSY. 3-72 Confidential