Brother HL-1070 Service Manual page 87

M-3
Possible cause
Failure of
connector
Main motor (M1)
Driver PCB
M-4
Possible cause
Connection
failure
Driver PCB
circuit
Paper pick-up
clutch solenoid
MP tray unit
failure
Main PCB
Relay PCB
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Main motor unrotated
Step
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?
No paper supplied
Step
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?
Check Result
No
No
Approx. 9
Approx. 9
Yes
Check Result
No
No
Yes
Yes
Yes
Yes
IV-23
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.