Brother MFC-L8850CDW Service Manual

2-85
Confidential
4.2 Troubleshooting for Paper Feeding Problems
Problems related to paper feeding are end user recoverable if following the User Check items.
If the same problem occurs again, follow each procedure in the order of the number described
in the Step column in the tables below.
4.2.1 No paper feeding from paper tray 1
< User Check >
- Check if the paper is loaded into the paper tray correctly.
- Check that too much paper is not loaded in the paper tray.
- Turn back the paper loaded in the paper tray or change the orientation of the paper by 180°.
- Check if the thickness of the paper is 60 to 105 g/m
2
.
- Check whether the MP tray or T2 paper tray unit is specified for the paper feeding tray.
- Fan the stack of paper well and reinsert the papers into the paper tray.
- When the T2 paper tray unit is available, check if the T2 paper tray unit is closed correctly.
- Clean the T1 paper pick-up roller.
Step Cause Remedy
1 T1 paper feed actuator coming
off
Re-assemble the T1 paper feed actuator.
2 Connection failure of the main
motor harness
Reconnect the main motor harness.
3 T1 roller holder ASSY installation
failure
Install the T1 roller holder ASSY correctly.
4 Connection failure of the T1
paper feed sensor PCB harness
Reconnect the T1 paper feed sensor PCB
harness.
5 T1 paper pick-up roller worn out Replace the PF kit 1.
6 T1 paper feed sensor failure Replace the T1 paper feed sensor PCB
ASSY.
7 Lift gear 46 damaged Replace the lift gear 46.
8 Paper feed related gear
damaged
Replace the main drive unit.
9 Main motor failure Replace the process drive unit.
10 Paper feed unit failure Replace the paper feed unit.
11 Fuser unit damaged Replace the fuser unit.
12 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