Service manual

4 TROUBLESHOOTING FOR OPERATION FAILURES
7-10
DUPLO DF-755 86V-M12D0-0
4.2.2 Button operations are disabled on the control panel
1) Is there any button which remains pressed?
Yes:
Release the button and check for button input.
2) Are the following connectors connected normally?
•MC unit (PCB1): J3
•Control panel: J2
No:
Connect them properly.
3) Are the bundled wires between the connectors of step 2) disconnected or short-circuited?
Yes:
Replace the bundled wires. Check for problems in the electric parts of the part
connected to and replace if faulty.
4) Is the problem solved after replacing the control panel (PCB2)?
Yes:
End.
No:
Replace the MC unit (PCB1).