Brother DCP-9040CN Service Manual page 332

1.4.8 Operational Check of Control Panel Button (Function code 13)
<Function>
This function allows you to check the control panel button for normal operation.
<Operating Procedure>
(1) Press the 1 and 3 buttons in this order in the initial stage of the maintenance mode.
The machine displays "00" on the LCD.
(2) Press the buttons in the order designated in the illustration shown below.
The LCD shows the corresponding number in decimal notation each time a button is
pressed. Check that the displayed number is correct by referring to the illustration below.
If a button is pressed out of order, the machine displays the "INVALID OPERATE" on the
LCD. To return to the status ready to accept button entry for operational check, press the
Stop/Exit button.
(3) After the last number button is pressed, the machine beeps for one second and returns to
the initial stage of the maintenance mode.
To terminate this operation, press the Stop/Exit button. The machine beeps for one
second and returns to the initial stage of the maintenance mode.
MFC-9440CN/ 9450CDN
DCP-9040CN/ 9042CDN
Fig. 5-6
Fig. 5-7
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