Brother MFC-8460N Servise Manual page 346

WARNING
If you analyze malfunctions with the power plug inserted into the power outlet, special caution should
be exercised even if the power switch is OFF because it is a single pole switch.
(3) Main motor failure
Possible cause Step
Failure of 1
connector
Main motor 2
Main PCB 3
(4) No paper supplied
Possible cause Step
Separation pad 1
/ pickup roller
failure
Failure of 2
connector
HVPS circuit 3
Paper pickup
clutch
solenoid
Main PCB 4
Check
Is the connection of
connector CN6 on the main
PCB correct?
Is the problem solved by
replacing the main motor?
Is the problem solved by
replacing the main PCB?
Check
Is the surface of the
separation pad or the
pickup roller dirty or worn
out?
Is the contact of the
solenoid connector on the
relay front PCB good?
Set the document into the
ADF, select MP tray in the
copy mode and press the
[Start] key.
Does the voltage between
pins 1(SOLENOID) and 2
(24V) of the CN1 TRAY1,
CN3 MP connector on the
relay front PCB change
from approx. 24V DC to
0V within the specified
time?
Is the problem solved by
replacing the main PCB?
9-22
Result Remedy
No Reconnect the connector.
Yes Replace the main motor.
Yes Replace the main PCB.
Result Remedy
Yes 1) Clean the surface of the
separation pad or pickup
roller.
2) Replace the separation pad
or pickup roller.
No Reconnect the connector.
Yes Replace the HVPS.
No Replace the paper pickup clutch
solenoid.
Yes Replace the main PCB.
Confidential