Control Panel Problems; No Display On The Lcd; Led Does Not Light Up; The Control Panel Does Not Work - Brother MFC Series Service Manual

4.6

Control Panel Problems

4.6.1

No display on the LCD

Step
1 Panel harness connection failure Reconnect the Panel harness.
2 LCD flat cable connection failure Reconnect the LCD flat cable.
3 Panel PCB defective
4 LCD unit defective
5 Power cord defective
6 Power supply PCB defective
7 Main PCB defective
4.6.2

LED does not light up

Step
1 Panel harness connection failure Reconnect the Panel harness.
2 Panel PCB defective
3 Control panel ASSY defective
4 Power cord defective
5 Power supply PCB defective
6 Main PCB defective
4.6.3

The control panel does not work

Step
1 Panel harness connection failure Reconnect the Panel harness.
2 Rubber key not properly attached Reattach the Rubber key. (1-Line LCD model)
3 Rubber key defective
4 Panel PCB defective
5 Control panel ASSY defective
6 Main PCB defective
4.6.4

Touch panel inoperative (only for models with a touch panel)

Step
1 Touch panel unadjusted
2 Panel harness connection failure Reconnect the Panel harness.
3 Control panel ASSY defective
4 Main PCB defective
Cause
Replace the Panel PCB. (1-Line LCD model)
Replace the Control panel ASSY and LCD unit.
Replace the Power supply PCB ASSY.
(US/CAN)
Replace the Power cord. (Outside US/CAN)
Replace the Power supply PCB ASSY.
Replace the Main PCB ASSY.
Cause
Replace the Panel PCB. (1-Line LCD model)
Replace the Control panel ASSY.
Replace the Power supply PCB ASSY.
(US/CAN)
Replace the Power cord. (Outside US/CAN)
Replace the Power supply PCB ASSY.
Replace the Main PCB ASSY.
Cause
Replace the Rubber key. (1-Line LCD model)
Replace the Panel PCB ASSY. (1-Line LCD model)
Replace the Control panel ASSY.
Replace the Main PCB ASSY.
Cause
Adjust the Touch panel.
(Refer to
Replace the Control panel ASSY.
Replace the Main PCB ASSY.
2-65
Solution
Solution
Solution
Solution
Chapter 5, Section 1.4.28)
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