Brother International MFC-9880N Service Manual - Page 135

3.6 Operational Check of LCD n Function This function allows you to check whether the LCD on the control panel works normally. n Operating Procedure (1) Press the 1 and 2 keys in this order in the initial stage of the maintenance mode. The LCD shows (2) For machines w/ fax: Press the Fax Start key. Each time you press the Fax Start key, the LCD cycles through the displays shown at right. For machines w/o fax: Press the Sort key. Each time you press the Sort key, the LCD cycles through the displays shown at right. Fax Start key or Sort key Fax Start key or Sort key Fax Start key or Sort key (3) Press the Stop key in any process of the above display cycle. The machine beeps for one second and returns to the initial stage of the maintenance mode. NOTE: The above illustration shows a 2-row LCD as a sample. 3.7 Operational Check of Control Panel PCB n Function This function allows you to check the control panel PCB for normal operation. n 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 machine 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 machine beeps and returns to the initial stage of the maintenance mode. To terminate this operation, press the Stop key. The machine returns to the initial stage of the maintenance mode. V - 13