Brother International HL-1070 Service Manual - Page 87

M-3 Main motor unrotated Possible cause Failure of connector Main motor (M1) Step 1 2 Check Is the connection of connector P12 on the driver PCB correct? 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? Result No No Remedy Reconnect the connector. Replace the Main motor. P12-1 and P12-3 P12-4 and P12-6 Approx. 9 Approx. 9 Driver PCB 3 is the problem solved by replacing the driver PCB? Yes Replace the driver PCB. M-4 No paper supplied Possible cause Connection failure Driver PCB circuit Paper pick-up clutch solenoid MP tray unit failure Main PCB Relay PCB Step Check Result Remedy 1 Is the contact of connector P11 No Reconnect the connector. on the driver PCB good? 2 Set paper on the manual paper No Replace the driver PCB. 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? Yes Replace the paper pick-up solenoid. 3 Is the surface of the separation Yes Clean the surface or replace. pad or the pick up roller worn out or stained? 4 Is the problem solved by replacing the main PCB? Yes Replace the main PCB. 5 Is the problem solved by replacing the relay PCB? Yes Replace the relay PCB. IV-23