Brother International MFC 8890DW Service Manual - Page 140
The control panel does not work., Rubber Key
UPC - 012502622673
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■ The control panel does not work. - Check whether the function lock is not set. Step 1 2 3 4 5 6 Possible cause Key sticking Connection between main PCB and control panel PCB Harness between main PCB and control panel PCB Rubber Key Control panel PCB Main PCB Check Is there a key on the control panel stuck? Are the main PCB and control panel PCB connected properly? Is the harness damaged? Is the problem solved after replacing the rubber key? Is the problem solved after replacing the control panel PCB? Is the problem solved after replacing the main PCB ASSY? Result Remedy Clean up the panel cover, Yes or remove the burrs from panel cover and panel keys. Reconnect the connector No properly. Replace the harness with a Yes normal one. Replace the rubber Key. Yes Replace the control panel Yes PCB. Replace the main PCB Yes ASSY. 3-68 Confidential
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