Makita DUC256, Repair Manual, Page: 31 / 32

31 / 32
9-3 Flowchart for Troubleshooting
Check the items in the following flowchart in order from the top to bottom. (Description of the item is referred to
CIRCUIT DIAGRAM in Fig. 50 .) After corrective action, return to the start of Troubleshooting and re-check again.
Symptom Cause Corrective action
(Continuing to next page)
Check Lead wires or replace
them.
Replace Controller.
Lead wires are broken.
No
Replace Controller.
Connect Connectors firmly.
Connectors are poorly
connected.
Replace Switch unit for
preventing kickback
No
Yes
Controller is broken.
Tester indicates proper figure. When tester cannot be
prepared, go to “Yes”.
Yes
No
Yes
Yes
No
No Yes
Replace Controller. Controller is broken.
Check Lead wires or replace
them. Lead wires are broken.
Three lamps of
Battery fuel gauge
on each Battery
light up.
Controller is broken.
No problem
Check Lead wires or replace
them.
Lead wires are broken.
Switch unit for preventing
kickback is broken.
See *1 in next page.
The mode lamp
blinks in green.
Power source lamp
lights up.
The mode lamp lights
up in green when
Main switch is pressed
more than 2 seconds.
Replace Trigger switch. Trigger switch is broken.
Variable speed
control works
properly by
Trigger.
Check Lead wires or replace
them. Lead wires are broken.
Replace Controller. Controller is broken.
Power source lamp
blinks in green when
Trigger switch is
pulled.
Motor runs when the
machine is switched
on. Try 10 times. In
case of occasional
starting, go to “No”.
Yes
No
No
Yes
Yes
No