Short-Circuit Test On Fet (Field Effect Transistor) Of Controller - Makita DTD155 Repair Manual

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Short-circuit test on FET (Field Effect Transistor) of controller

Trouble on Controller can be checked with Digital tester as follows.
Fig. 52
Fig. 53
Fig. 54
1
Set Digital tester (1R402-A) to the Diode mode.
2
After removing the battery from the machine, pull Switch
trigger and hold it in the "ON" position with tape or the like.
3
Attach Black probe to the plus pole of Terminal, and Red probe
to the minus pole.
Be careful not to attach the probes to the wrong Terminals.
4
Wait until the voltage value shown on the tester is stable , and
then check the value. There is no problem with FET of
Controller if the value is within the range of 0.7V -0.9V. If the
value is 0V or 0.4V approx., Controller is broken. Replace it
with a new one.
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Note