Makita DGA405 Technical Information page 9

R
epair
[4] TROUBLE SHOOTING (cont.)
Test for recognizing the short-circuit of FET* on controller
Remove Battery, and then do as shown in Fig. T-3.
Fig. T-3
1. Set Digital tester (1R402) in the diode mode (
3. Attach the black bar to (+) Terminal,
and the red bar to (-) Terminal.
Note: Be careful not to reverse them.
The reverse attachment could spoil the test.
Wait until the display shows the value without
fluctuation.
black bar
red bar
*FET: Field effect transistor
mark).
4. There is no fault of FET on Controller if the display
indicates between 0.79V and 0.81V.
If the display indicates 0V or 0.4V approximately,
FET built in Controller has any trouble,
and Stator complete** has to be replaced.
(+) Terminal
(-) Terminal
2. Lock Switch lever complete
with an insulating tape or a like.
Insulating tape
Switch lever complete
**It includes Controller.
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