Brother DCP-7090 Service Manual page 88

 Error code 0401
BD sensor failure (second time)
Error code 0405
BD sensor failure (first time)
<User Check>
• There is a possibility of condensation. Leave the front and back cover open for at least 30
minutes when the power is ON. Close those covers and turn the power switch OFF and then
back ON again.
Step
Connection failure of the laser
1
unit flat cable
2 Laser unit failure
3 Main PCB failure
Cause
2-48
Remedy
Reconnect the laser unit flat cable.
Replace the laser unit.
Replace the main PCB ASSY.
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