Troubleshooting; Note For Repairing; Test For Checking The Short-Circuit In Fet (Field Effect Transistor) Of Controller - Makita DUC256 Repair Manual

9

TROUBLESHOOTING

Whenever you find any trouble in your machine, first, see this list to check the machine for solution.
9-1

Note for Repairing

The content may vary depending on the model.
1
Use a full charged battery which has a star mark.
2
When Housing is disassembled, check the conditions of the electrical parts (Connectors, Lead wires, Switches, etc.),
Rotor, Stator, Gear section, etc.
3
Be sure to test the machine 10 times to correctly diagnose functions such as variable speed control, etc.
4
In order to make it easier to reproduce symptoms, run the motor at Normal speed.
5
Use the following Repairing tools for diagnosing LED and Switch.
Repairing tools
1R402
1R402-B
1R412
1R413
9-2

Test for checking the short-circuit in FET (Field Effect Transistor) of controller

1.0v
For checking variable resistance value or electrical continuity at contact points
For checking whether LED lights up
For checking variable resistance value or electrical continuity at contact points
Fig. 55
1R402
Fig. 56
1R402-B
1R402-B
Purpose
1
Set Digital tester 1R402 to Diode mode.
2
Connect Black probe to the plus pole of Terminal
and Red probe to the minus pole.
By attaching 1R402-B to each probe of 1R402, you
can make your hands free for easier check.
Be careful not to reverse them. The reversed contacts
could spoil the test.
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Tips
Note