Brother HL1060 - B/W Laser Printer Service Manual page 87

M-3 Main motor unrotated
Possible cause Step
Failure of
connector
Main motor (M1)
Driver PCB
M-4 No paper supplied
Possible cause Step
Connection
failure
Driver PCB
circuit
Paper pick-up
clutch solenoid
MP tray unit
failure
Main PCB
Relay PCB
Check
1 Is the connection of connector
P12 on the driver PCB correct?
2 Disconnect connector P12 from
the driver 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?
P12-1 and P12-3
P12-4 and P12-6
3 is the problem solved by
replacing the driver PCB?
Check
1 Is the contact of connector P11
on the driver PCB good?
2 Set paper on the manual paper
slot and make the test print by
pressing the switch on the
control panel.
Does the voltage between pins
2 (SOLENOID) and 1 (24V) of
the P11 connector on the driver
PCB change from approx. 24V
DC to 0V within the specified
time?
3 Is the surface of the separation
pad or the pick up roller worn
out or stained?
4 Is the problem solved by
replacing the main PCB?
5 Is the problem solved by
replacing the relay PCB?
CHAPTER IV -23
Result
No
No
Approx. 9
Approx. 9
Yes
Result
No
No
Yes
Yes
Yes
Yes
Remedy
Reconnect the connector.
Replace the Main motor.
Replace the driver PCB.
Remedy
Reconnect the connector.
Replace the driver PCB.
Replace the paper pick-up
solenoid.
Clean the surface or replace.
Replace the main PCB.
Replace the relay PCB.