Brother MFC6800 Service Manual page 145

Power requirements
Check that:
(1) The power supply specified on the rating plate located on the bottom of the machine is used.
The supply voltage stays within the rating ±10%.
(2) Each voltage level on AC input lines and DC lines is correct.
(3) All cables and harnesses are firmly connected.
(4) None of the fuses are blown.
Recording paper
Check that:
(1) A recommended type of recording paper is used.
(2) The recording paper is not dampened.
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