Brother MFC-L8850CDW Service Manual

2-116
Confidential
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
< User Check >
- Turn the power OFF/ON.
Step Cause Remedy
1 The version of the panel
firmware and the main
firmware do not match.
Install the latest panel firmware and main
firmware.
2 Connection failure of the key
PCB flat cable
Reconnect the key PCB flat cable.
3 Connection failure of the
panel PCB harness
Reconnect the panel PCB harness.
4 Connection failure of the LCD
flat cable
Reconnect the LCD flat cable.
5 Connection failure of the
low-voltage power supply
PCB harness
Reconnect the low-voltage power supply
PCB harness.
6 AC cord failure Replace the AC cord.
7 Panel PCB failure Replace the panel PCB unit.
8 LCD failure Replace the LCD.
9 Key PCB failure Replace the panel cover ASSY.
10 Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
unit.
11 Main PCB failure Replace the main PCB ASSY.

Brother MFC-L8850CDW Specifications

General

Type	all in one
Color	white
Tray Capacity	300
Automatic Document Feeder Capacity	50 sheets
Paper Size	8.5"x14"
Paper Handling	up to 300 sheets
Color Print Speed	32 pages per minute
Mono Print Speed	32 pages per minute
Print Resolution Color	up to 2400 x 600
Maximum Number of Pages Per Month	unknown
Scanner Type	flatbed
Scan Resolution	up to 2400 x 1200
Copier Resolution Mono	up to 600 x 600
Copier Resolution Color	up to 600 x 600
Cartridges	tn331bk, tn331c, tn331m, tn331y
Number Of Cartridges	4
Internal Memory	yes
Memory Card	no
Network	wired, wireless
Connectivity	usb, google cloud print
OS Compatibility	windows, mac os, linux
Mobile Devices Connection	yes

Weight and Dimensions

Height	19.3 inches
Width	20.7 inches
Net Weight	67.4 pounds