Brother HL-5240 Service Manual page 147

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
WARNING
Check
Is the connection of connector
CN4 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 paper in the manual feed
slot and make a test print by
pressing the Go button.
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?
4-33
HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
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 relay front PCB.
No Replace the paper pickup
clutch solenoid.
Yes Replace the main PCB.
Confidential