We fixed this by taking the finishing unit (tower to the left) and leaning against it so it had better contact with the rest the copier
SOURCE: brother laser mcf-8440/ machin error 7a
and brother would say...7a= Main motor does not synchronize with the reference clock, .... check.....
• Thermistor ASSY
• Main PCB
• Engine PCB
• Main motor
and fix i'd say is to replace main board.
SOURCE: display screen says: door/covers open close covers of relay unit??
I believe the "relay Unit" on that machine is the section that transports copies to either the finisher (if installed) or the exit tray on the LEFT side of that machine. Sometimes neither of these units are present, but the relay unit may still be installed.
There are 2 flip up covers on that section (left and right), and you will probably see that one of them (usually the left one) has come unclipped, or perhaps the plastic clip that holds it closed is broken. If you flip up this unit. You will see a black button at the back end that is engaged when ther unit is closed. If you simply pree this button with your finger, hopefully the message will go away - this may at least help you troubleshoot what is causing the "cover open" message). Even if the clip is broken, it is often just a matter of seating the unit correctly so that the switch is engaged when the unit is closed. There is also the same switch on the right cover that could be causing the problem, but this cover doesn't sem to get damged as often.
I hope this helps. Please let me know.
SOURCE: message on sharp ar501 copier. close finisher
Check the finisher covers sensor or microswitch.or anymore mechanical components deformation.
SOURCE: showin cover open but doesnt indicate plus sc code 670
Check the
fuse FU1 y FU2 in the power supply board FU1 display open door Without saying
as. The flat cable of the laser also can cause the fault of open door,
cut or badly connected this also it can be indicate door opened without
indicating as.
El cable plano del laser cortado o mal conectado, tambien puede provocar
la falla de puerta abierta sin indicar cual de ellas está abierta.
SOURCE: unit says ''close finisher unit and finisher covers''
I have the same issue. Did you ever find a resolution?
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