Brother FAX 750, Service Manual

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3.6 Operational Check of LCD
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Function
This function allows you to check whether the LCD on the control panel works normally.
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Operating Procedure
(1) Press the 1 and 2 keys in this
order in the initial stage of the
maintenance mode.
The LCD shows
(2) Press the Start key. Each
time you press the Start key,
the LCD cycles through the
displays shown at right.
(3) Press the Stop key in any process of the above display cycle. The equipment beeps for one
second and returns to the initial stage of the maintenance mode.
3.7 Operational Check of Control Panel PCB
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Function
This function allows you to check the control panel PCB for normal operation.
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Operating Procedure
(1) Press the 1 and 3 keys in this order in the initial stage of the maintenance mode.
The "00 " will appear on the LCD.
(2) Press the keys and buttons in the order designated in the illustration shown below.
The LCD shows the corresponding number in decimal notation each time a key or button is
pressed. Check that the displayed number is correct by referring to the illustration below.
If a key or button is pressed out of order, the equipment beeps and displays the "INVALID
OPERATE" on the LCD. To return to the status ready to accept key & button entry for
operational check, press the
Stop key.
(3) After the last number key or button is pressed, the equipment beeps and returns to the initial
stage of the maintenance mode.
To terminate this operation, press the Stop key. The equipment returns to the initial stage of
the maintenance mode.