Brother MFC-L8850CDW Service Manual

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Confidential
■ Error code 6801
The internal temperature sensor or side thermistor of the fuser unit detected a temperature
higher than the specified value.
< User Check >
- Decrease the room temperature.
- Place the machine away from a heater.
■ Error code 6901
Some fuser unit errors occurred at power-ON or upon recovery from sleep mode.
Error code 6902
After the errors was detected at the fuser unit, power was turned ON again and the error is
being checked. (If power is turned OFF and ON after error code 6901 occurred, this code is
displayed for about 15 minutes.)
Cooling Down
Wait for a while
Step Cause Remedy
1 Connection failure of the internal
temperature sensor harness
Reconnect the internal temperature
sensor harness.
2 Side thermistor of the fuser unit
failure
Replace the fuser unit.
3 Main PCB failure Replace the main PCB ASSY.
Self-Diagnostic
Turn the power off, then on again. Leave the machine for 15 min.
Self-Diagnostic
Will Automatically Restart within 15 minutes.
Step Cause Remedy
1 Connection failure of each
harness of the fuser unit
Reconnect each harness of the fuser unit.
2 Connection failure of the eject
sensor PCB harness
Reconnect the eject sensor PCB harness.
3 Fuser unit failure Replace the fuser unit.
4 Eject sensor PCB failure Replace the eject sensor PCB ASSY.
5 Low-voltage power supply PCB
failure
Replace the low-voltage power supply
PCB unit.
6 Main PCB failure Replace the main PCB ASSY.
Note:
- Turn OFF the power switch. After checking that the fuser unit has cooled sufficiently, turn
ON the power switch again and leave the machine for ten minutes. This problem may
then be cleared.
- To clear the fuser unit error after the remedy of the error is taken, enter the maintenance
mode and then exit from the maintenance mode using Function code 99.

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