Brother MFC-8220 Service Manual page 199

M-3 Main motor failure
Possible cause Step
Failure of 1
connector
Main motor 2
Engine PCB 3
Main PCB 4
M-4 No paper supplied
Possible cause Step
Separation pad / 1
paper pick-up
roller failure
Failure of 2
connector
Engine PCB 3
circuit
Paper pick-up
clutch solenoid
Main PCB 4
M-5 Insufficient output from high-voltage power supply unit
Possible cause Step
High-voltage 1
contact
High-voltage 2
power supply
PCB
Check
Is the connection of connector
CN9 on the engine PCB
correct?
Is the problem solved by
replacing the main motor?
Is the problem solved by
replacing the engine PCB?
Is the problem solved by
replacing the main PCB?
Check
Is the surface of the separation
pad or the paper pick-up roller
dirty or worn out?
Is the contact of the solenoid
connector on the engine PCB
good?
Set paper in the manual feed
tray and make a test print by
pressing the control panel
button.
Does the voltage between pins
2 (solenoid) and 1 (24V) of the
CN16 connector on the engine
PCB change from approx. 24V
DC to 0V within the specified
time?
Is the problem solved by
replacing the main PCB?
Check
Do any of the terminals on the
high-voltage contacts have dirt
or contact burns?
Check the connections of the
connector between the high-
voltage power supply and the
engine PCB are secured
correctly.
6-21
Result Remedy
No Reconnect the connector.
No Replace the main motor.
No Replace the engine PCB.
No Replace the main PCB.
Result Remedy
Yes 1) Clean the surface of the
separation pad or paper
pick-up roller.
2) Replace the separation
pad or paper pick-up roller.
No Reconnect the connector.
No Replace the engine PCB.
Yes Replace the paper pick-up
clutch solenoid.
No Replace the main PCB.
Result Remedy
Yes Clean the terminals.
Yes Replace the high-voltage
power supply PCB.
No Reconnect the connector
between the high-voltage
power supply and the engine
PCB.
MFC-8220
SERVICE MANUAL