Service manual

4 TROUBLESHOOTING FOR OPERATION FAILURES
7-9
DUPLO DF-755 86V-M12D0-0
4 TROUBLESHOOTING FOR OPERATION FAILURES
4.1 Power
4.1.1 Power does not turn on
1) Is the power plug inserted into the power outlet properly?
No:
Insert it properly.
2) Is the fuse (F1) burned out?
Yes:
Replace the fuse (F1).
3) Are the following connectors connected properly?
•AC motor drive unit: J1, J4
•MC unit (PCB1): J6
No:
Connect them properly.
4) Are the bundled wires between the connectors of step 3) 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.
5) Is rated power supplied to the outlet?
No:
Explain to the user that the unit is not faulty.
6) When the power switch is turned on, is power conducted to it?
No:
Replace the power switch.
7) When the power switch is turned on, is AC power supplied to the AC motor drive unit (PCB3)?
Yes:
Replace the AC motor drive unit (PCB3).
No:
Replace the bundled wires from the power switch to the AC motor drive unit
(PCB3). Check for problems in the electric parts of the part connected to and
replace if faulty.
4.2 Operations
4.2.1 Nothing is displayed on the control panel
1) Check "4.1.1 Power does not turn on."
2) Are the following connectors connected properly?
•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).