Flowchart Of Troubleshooting - Makita DTD155 Repair Manual

9-2

Flowchart of Troubleshooting

Check the items from the top to the bottom of the following list. (Description of the item is referred to Circuit diagram)
After corrective action, return to the start of Troubleshooting and re-check again.
Symptom
Does Tester indicate within the range of
0.7-0.9V? If Tester is not available, go to
"Yes".
Yes
Yes
Motor runs when
the machine is
switched on.
(Do this test 10
times each in
Forward/Reverse
rotation. In case
of occasional no
start, go to "No"
No
(continued to next page)
No
No
Rotation speed can
be changed, and
the direction of
rotation can be
changed.
Yes
No
LED job light is
on.
Yes
The machine
works properly.
24 / 26
Cause
Controller is broken.
Connectors are poorly
connected.
Lead wires are broken.
Switch is broken.
Connectors are poorly
connected.
Lead wires are broken.
LED circuit is broken.
Switch is broken.
Corrective action
Replace Controller.
Connect Connectors firmly.
Check Lead wires and
replace them.
Replace Switch.
Connect Connectors firmly.
Check Lead wires and
replace them.
Replace LED circuit.
Replace Switch.