Confidential
2-73
4.6
Control Panel Problems
4.6.1 No display on LCD
4.6.2 No display on LED
4.6.3 The control panel does not work
4.6.4 Touch panel inoperative
Step
Cause
Solution
1
LCD PCB harness connection
failure
Reconnect the LCD PCB harness.
2
LCD harness connection
failure
Reconnect the LCD harness.
3
LCD unit defective
Replace the LCD unit.
4
LCD PCB ASSY defective
Replace the LCD PCB ASSY.
5
Power supply PCB and
power cord defective
Replace the power supply PCB ASSY.
6
Main PCB defective
Replace the main PCB ASSY.
Step
Cause
Solution
1
LCD PCB harness connection
failure
Reconnect the LCD PCB harness.
2
Panel PCB harness
connection failure
Reconnect the panel PCB harness.
3
LCD PCB ASSY defective
Replace the LCD PCB ASSY.
4
Panel PCB defective
Replace the panel ASSY.
5
Power supply PCB and
power cord defective
Replace the power supply PCB ASSY.
6
Main PCB defective
Replace the main PCB ASSY.
Step
Cause
Solution
1
Panel PCB harness
connection failure
Reconnect the panel PCB harness.
2
Panel PCB defective
Replace the panel ASSY.
3
Power supply PCB defective
Replace the power supply PCB ASSY.
4
Main PCB defective
Replace the main PCB ASSY.
Step
Cause
Solution
1
LCD PCB harness connection
failure
Reconnect the LCD PCB harness.
2
Touch panel harness
connection failure
Reconnect the touch panel harness.
3
LCD PCB ASSY defective
Replace the LCD PCB ASSY.
4
Touch panel ASSY defective
Replace the touch panel ASSY.
5
Power supply PCB defective
Replace the power supply PCB ASSY.
6
Main PCB defective
Replace the main PCB ASSY.
Summary of Contents for MFC-J6920DW
Page 123: ...3 3 Confidential 2 PACKING ...
Page 146: ...3 26 Confidential 3 Set the protective part Protective part ...
Page 308: ...5 37 Confidential pfadj2 Pattern ...
Page 315: ...5 44 Confidential Margin Check Pattern ...
Page 362: ...App 3 8 Confidential When the following screen appears click Close to close the screen ...