Brother International DCP 8040 Service Manual - Page 236
Main PCB, relay PCB,
UPC - 012502610328
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MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL F-5 Speaker is silent during on-hook dialing. 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, relay PCB, and control panel PCB Harness between main PCB, relay PCB, and control panel PCB NCU PCB Relay PCB Main PCB Step 1 2 3 4 5 6 7 8 9 Check Main PCB and speaker are properly connected. Replacement of speaker solves the problem. Main PCB and NCU PCB are properly connected. Harness wire is damaged. Main PCB, relay PCB, and control panel PCB are properly connected. Harness wire is damaged. Replacement of NCU PCB solves the problem. Replacement of relay PCB solves the problem. Replacement of main PCB solves the problem. Result Remedy No Fix the connection properly. Yes Replace the speaker with a normal part. No Fix the connection properly. Yes Replace the harness with a normal part. No Fix the connection properly. Yes Replace the harness with a normal part. Yes Replace the NCU PCB with a normal part. Yes Replace the relay PCB with a normal part. Yes Replace the main PCB with a normal part. F-6 Dialing function does not switch between "tone" and "pulse". Possible cause Connection between main PCB and NCU PCB Harness between main PCB and NCU PCB NCU PCB Main PCB Step 1 2 3 4 Check Main PCB and NCU PCB are properly connected. Harness wire is damaged. Replacement of NCU PCB solves the problem. Replacement of main PCB solves the problem. Result Remedy No Fix the connection properly. Yes Replace the harness with a normal part. Yes Replace the NCU PCB with a normal part. Yes Replace the main PCB with a normal part. 6-33