Print unable EF in Brother DCP-7055 machine How to solve?

https://www.manualslib.com/manual/794794/Brother-Dcp-7055.html?page=106

Brother DCP 7055 Service Manual Error Code Ee ef

Quoting from the free manual Page 2-69:

? Error code EF
Print Unable EF
Turn the power off and then back on again.
The supplied power is unstable.
Step
The irregular power supply is
detected
1
2
Main PCB failure
Note:
• The irregular power supply detection error (Machine Error EF) occurs when there is a
large fluctuation in the power supply voltage supplied to the machine.
In this case, if the same power supply is used, the same error might occur again even if
the low voltage power supply PCB ASSY is replaced.

Please provide detailed information on what the problem is; just saying model and problem give us nothing to work with.

Error code EF - Irregular power supply is detected
Print Unable EF
Turn the power off and then back on again.

Check the ventilation fan (not working)

Solution to print unable error et

How solution Unebal to EF in Brother DCP 7055 matchine ?

PRint unable EF

I have brother DCP 7055 it shows print unable 72 & some time it show 71 error pls suggest

This came from the Brother HelpDesk, yes they rang me and it worked.
Cover open Press Clear "Replace Drum?" (ignore this and quickly...) Press Start (blank screen, quickly...) Press Up arrows then switch to down arrow to 00 Press OK

brother dcp 7055 error-EF laser