Brother HL-1040 - Manual (Page 90)

IV-23
M-3 Main motor unrotated
Possible cause Step Check Result Remedy
Failure of
connector 1 Is the connection of connector
P9 on the panel sensor PCB
correct? No Reconnect the connector.
Main motor (M1) 2 Disconnect connector P9 from
the panel sensor PCB.
Measure the resistance
between the connector pins of
the main motor by using a
circuit tester.
Do the measured resistances
satisfy the prescribed values in
the table below?
P9-5 and P9-6
P9-7 and P9-8 Approx.4.5
Approx.4.5
No Replace the main motor.
Main PCB 3 Is the problem solved by
replacing the main PCB? Yes Replace the main PCB.
Sub motor
unrotated 4 Disconnect connector P9 from
the panel sensor PCB.
Measure the resistance
between the connector pins of
the main motor by using a
circuit tester.
Do the measured resistances
satisfy the prescribed values in
the table below?
P9-1 and P9-2
P9-3 and P9-4 Approx.9.1
Approx.9.1
No Replace the sub motor.
M-4 No paper supplied
Possible cause Step Check Result Remedy
Connection
failure 1 Is the contact of connector P3
on the panel sensor PCB
good? No Reconnect the connector.
Panel sensor
PCB circuit 2 Set paper in the manual paper
slot and make a test print by
pressing the switch on the
control panel. No Replace the panel sensor
PCB.
Paper pick-up
clutch solenoid Does the voltage between pins
2 (SOLENOID) and 1 (24V) of
the P3 connector on the panel
sensor PCB change from
approx. 24V DC to 0V within
the specified time? Yes Replace the paper pick-up
solenoid.
MP tray unit
failure 3 Is the surface of the separation
pad or the pick up roller
stained or worn out? Yes Clean the surface or replace.
Main PCB 4 Is the problem solved by
replacing the main PCB? Yes Replace the main PCB.