Control Panel Problems; No Display On The Lcd; Led Does Not Light Up; The Control Panel Does Not Work - Brother DCP-J552DW Service Manual

4.6

Control Panel Problems

4.6.1

No display on the LCD

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

LED does not light up

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

The control panel does not work

Step
1 Panel harness connection failure
2 Rubber key not properly attached
3 Rubber key defective
4 Panel PCB defective
5 Control panel ASSY defective
6 Main PCB defective
4.6.4

Touch panel inoperative

Step
1 Touch panel unadjusted
2 Panel harness connection failure
3 Control panel ASSY defective
4 Main PCB defective
Cause
Reconnect the panel harness.
Reconnect the LCD flat cable.
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
Reconnect the panel harness.
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
Reconnect the panel harness.
Reattach the rubber key.
Replace the rubber key.
Replace the panel PCB.
Replace the control panel ASSY.
Replace the main PCB ASSY.
Cause
Adjust the touch panel.
(Refer to
Reconnect the panel harness.
Replace the control panel ASSY.
Replace the main PCB ASSY.
2-73
Solution
Solution
Solution
Solution
Chapter 5, Section 1.3.31)
Confidential