Brother 1240 Service Manual page 141

M-3 Main motor does not rotate
Possible cause Step
Failure of 1
connector
Main motor 2
Engine PCB 3
Main PCB 4
M-4 No paper supplied
Possible cause Step
Failure of 1
connector
Engine PCB 2
circuit
Paper pick-up
clutch solenoid
Separation pad / 3
pick-up roller
failure
Main PCB 4
Check
Is the connection of connector
P9 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 contact of the solenoid
connector on the engine PCB
good?
Set paper in the manual paper
slot and make a test print by
pressing the control panel
button.
Does the voltage between pins
2 (SOLENOID) and 1 (24V) of
the P13 connector on the
engine PCB change from
approx. 24V DC to 0V within
the specified time?
Is the surface of the separation
pad or the pick-up roller dirty or
worn out?
Is the problem solved by
replacing the main PCB?
6-19
CHAPTER 6 TROUBLESHOOTING
Result Remedy
No Reconnect the connector.
Yes Replace the main motor.
Yes Replace the engine PCB.
Yes Replace the main PCB.
Result Remedy
No Reconnect the connector.
Yes Replace the engine PCB.
No Replace the paper pick-up
solenoid.
Yes 1) Clean the surface of the
separation pad or pick-up
roller.
2) Replace the separation pad
or pick-up roller.
Yes Replace the main PCB.