Brother MFC-8220 Service Manual

CHAPTER 6 TROUBLESHOOTING
6-22
M-6 Fixing heater temperature failure
Possible cause Step Check Result Remedy
Poor thermistor
harness contact
1 Is the contact of connector
CN7 on the engine PCB good?
No Reconnect the connector.
Blown thermal
fuse
2 Remove the fixing unit and
measure the resistance of the
thermal fuse. Is it open circuit?
Yes Replace the fixing unit.
Thermistor
failure
3 Is the thermistor installed
properly?
Yes Replace the fixing unit.
No Reinstall the thermistor
properly.
Halogen heater
lamp failure
4 Remove the fixing unit and
measure the resistance of the
halogen heater lamp. Is it
open circuit?
Yes Replace the halogen heater
lamp.
M-7 Laser Unit failure
Possible cause Step Check Result Remedy
Harness
connection
failure (1)
1 Is the LD harness connector
on the main PCB secured
correctly?
No Reconnect the connector
securely.
Yes Replace the laser unit.
Harness
connection
failure (2)
2 Is the polygon motor connector
on the engine PCB secured
correctly?
No Reconnect the connector
securely.
Yes Replace the laser unit.
M-9 Fixing Unit failure
Possible cause Step Check Result Remedy
Poor thermistor
harness contact
1 Is the contact of connector
CN7 on the engine PCB good?
No Reconnect the connector.
Blown thermal
fuse
2 Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
Yes Replace the fixing unit.
Thermistor
failure
3 Is the thermistor installed
properly?
Yes Replace the fixing unit.
No Reinstall the thermistor
properly.
Halogen heater
lamp failure
4 Remove the fixing unit and
measure the resistance of the
halogen heater lamp. Is it
open circuit?
Yes Replace the halogen heater
lamp.
Heater harness
connection
failure
5 Is the heater harness
connector connected to the
low-voltage power supply PCB
and fixing unit secure?
No Reconnect the connectors
securely.

Brother MFC-8220 Specifications

General

Type	all in one
Tray Capacity	250
Automatic Document Feeder Capacity	30 sheets
Paper Size	letter, legal, a4, b5, a5, b6, a6, exe
Paper Handling	up to 250 sheets
Mono Print Speed	21 pages per minute
Print Resolution Mono	up to 2400 x 600
Maximum Number of Pages Per Month	up to 20, 000
Scanner Type	sheetfed
Scan Resolution	up to 300 x 600
Copier Resolution Mono	up to 600
Fax Function	yes
Cartridges	n/a
Number Of Cartridges	2
Internal Memory	yes
Network	not applicable
Connectivity	parallel, usb 2.0
OS Compatibility	pc: windows 95, 98, 98se, me, nt workstation 4.0, 2000 professional or xp, mac: os 8.6 to 9.2, os x 10.1, 10.2.1 to 10.3 or later, available usb 2.0 or parallel port
Mobile Devices Connection	no

Weight and Dimensions

Height	13.2 inches
Width	17 inches
Net Weight	25.6 pounds