Brother MFC-J6935DW Service Manual

Confidential
2-78
4.6 Control Panel Problems
4.6.1 No display on LCD/Incorrect display on LCD
4.6.2 No display on LED
4.6.3 The control panel does not work
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 LCD flat cable connection
failure
Reconnect the LCD flat cable.
3 Breakage of panel flat cable Replace the panel flat cable.
4 LCD PCB defective Replace the LCD PCB.
5 LCD defective Replace the LCD ASSY.
6 Control panel ASSY defective Replace the control panel ASSY.
7 AC cord ASSY or power
supply PCB defective
Replace the AC cord ASSY or power supply
PCB ASSY.
8 Main PCB defective Replace the main PCB.
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 Breakage of panel flat cable Replace the panel flat cable.
3 Panel PCB defective Replace the panel PCB ASSY.
4 LCD PCB defective Replace the LCD PCB.
5 Control panel ASSY defective Replace the control panel ASSY.
6 AC cord ASSY or power
supply PCB defective
Replace the AC cord ASSY or power supply
PCB ASSY.
7 Main PCB defective Replace the main PCB.
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 Panel PCB defective Replace the panel PCB ASSY.
3 LCD PCB defective Replace the LCD PCB.
4 Key defective Replace the control panel ASSY.
5 Main PCB defective Replace the main PCB.

Brother MFC-J6935DW Specifications

General

Type	all in one, copier, fax, scanner
Color	gray
Touch Screen	yes
Display Size	3.7 inches
Tray Capacity	500
Output Tray Capacity	100
Automatic Document Feeder Capacity	50 sheets
Paper Size	letter, ledger, executive, envelope (com-10, dl envelope, monarch), a3, a4, a5, a6 photo 4"x6", 3.5"x5", 5"x7", 5"x8", manual by-pass: 3.5" x 5" to 11" x 17"
Printing Method	color
Color Print Speed	20 pages per minute
Mono Print Speed	22 pages per minute
First Page Print Time	6 seconds
Print Resolution Mono	up to 4800 x 1200
Print Resolution Color	up to 4800 x 1200
Two-Sided Printing	no
Maximum Number of Pages Per Month	up to 30, 000
Photo Printing	yes
Scanner Type	flatbed
Scan Resolution	up to 19200 x 19200
Duplex Scan	yes
Fax Function	yes
Cartridges	lc3029bk/c/m/y inkvestment super high-yield cartridges
Number Of Cartridges	4
Number of Ink Tanks	0
Internal Memory	yes
Memory Card	no
Network	wired, wireless
Connectivity	apple airprint, brother iprint&scan, ethernet, google cloud print, mopria print service, nfc, usb, wi-fi direct
OS Compatibility	windows 10, 8.1, 8, 7, vista; windows server 2012, 2012 r2, 2008, 2008 r2; os x v 10.11.x, 10.10.x, 10.9.5.x; hdd space for drivers and apps
Mobile Devices Connection	yes

Weight and Dimensions

Depth	22.7 inches
Height	14.7 inches
Width	22.6 inches
Net Weight	51.8 pounds