Brother MFC-J3520 Service Manual

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.

Brother MFC-J3520 Specifications

General

Print Technology	Inkjet
Duplex Printing	Yes
Fax Modem Speed	33.6 kbps
Functions	Print, Copy, Scan, Fax
Standard Paper Capacity	250 sheets
Mobile Printing	Yes
Max Print Resolution	6000 x 1200 dpi
Scanner Type	Flatbed + ADF
Max Scan Resolution	1200 x 2400 dpi
Connectivity	USB, Ethernet, Wi-Fi
Automatic Document Feeder (ADF)	Yes
Ink Cartridges	Black, Cyan, Magenta, Yellow
Print Speed (Black)	Up to 35 ppm (draft), 12 ppm (ISO)
Print Speed (Color)	27 ppm
Display	2.7" Touchscreen Color LCD