Flowchart For Troubleshooting - Makita DUC256 Repair Manual

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