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