Brother DCP-8070D Service Manual page 163

■ The control panel does not work.
<User Check>
- Check whether the function lock is not set.
Step Possible cause
Key sticking
1
Connection
between main
2
PCB and control
panel PCB
Rubber Key
3
Control panel
4 PCB
Main PCB
5
Check
Is there a key on the
control panel stuck?
Are the main PCB and
control panel PCB
connected properly?
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?
3-72
Result Remedy
Clean up the panel cover,
or remove the burrs from
Yes
panel cover and panel
keys.
Reconnect the connector
properly.
No
Replace the rubber Key.
Yes
Replace the control panel
Yes PCB.
Replace the main PCB
Yes ASSY.
Confidential