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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
Purpose
1R402
For checking variable resistance value or electrical continuity at contact points
1R402-B
1R412
For checking whether LED lights up
1R413
For checking variable resistance value or electrical continuity at contact points
9-2
Test for checking the short-circuit in FET (Field Effect Transistor) of controller
Fig. 55
1
Set Digital tester 1R402 to Diode mode.
Fig. 56
2
Connect Black probe to the plus pole of Terminal
and Red probe to the minus pole.
Tips
By attaching 1R402-B to each probe of 1R402, you
can make your hands free for easier check.
Note
Be careful not to reverse them. The reversed contacts
could spoil the test.
1R402-B
1R402-B
1R402
1.0v