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NOTE: Before troubleshooting, be sure to wipe off all dust, water, and other foreign matter from the
internal parts, and then dry the parts completely.
Trouble
Cause
1. Motor
Flexible shaft is locked. Turn on the switch and check whether the switch
does not
rotate.
Stator FET PCB ass'y
is inclined (improperly
mounted).
Ball bearing in the rotor
ass'y is locked.
Contact failure of the
magnet in the rotor
ass'y
Connector cables of
the switch and battery
terminal are improperly
inserted.
Faulty stator FET PCB
ass'y
2. Motor
Ball bearing in the
stops in a
flexible ass'y is faulty.
few
seconds
after
Ball bearing in the rotor
starting.
ass'y is faulty.
3. Mode
Connector cable of the
cannot
switch panel is
be
improperly inserted.
changed.
• Warning signals
This product features functions that are designed to protect the tool itself as well as the battery.
During work, from the time the switch is being pulled and ten seconds after its release, each of the
protective functions may be activated, resulting in the indicator lamp on the switch panel to blink as
shown in the table below to notify the user. When any of the safeguard functions is triggered,
immediately remove your finger from the switch trigger and take corrective action described in the
table below.
Indicator
lamps blink.
TROUBLESHOOTING GUIDE
panel indicates overload status or not.
Remove the flexible ass'y and check whether the
motor rotates or not.
Turn on the switch and check whether the switch
panel indicates overload status or not.
Remove the flexible ass'y and check whether the
motor rotates or not.
Turn on the switch and check whether the switch
panel indicates overload status or not.
Check whether the ball bearing in the rotor ass'y
smoothly rotates or not.
Check whether the sensor magnet in the rotor ass'y
is deviated from the end face of the rotor core or not.
Turn on the switch and check whether the indicator
lamp on the switch panel lights or not.
Check whether the connector cables are properly
inserted or not.
Check the surface of the PCB for peeling of
urethane, missing of elements, or trace of dropping.
Turn on the switch and check whether the switch
panel indicates overload status or not.
Remove the flexible ass'y and check whether the
motor stops or not.
Turn on the switch and check whether the switch
panel indicates overload status or not.
Check whether the ball bearing smoothly moves or
not.
Turn on the switch and check whether the indicator
lamp on the switch panel lights or not.
Check whether the connector cable is properly
inserted or not.
Safeguard function
Overload protection
Temperature protection
Checking
LED light display
ON 0.1 second/OFF 0.1 second
ON 0.5 second/OFF 0.5 second
-1-
Corrective action
Replace the flexible
ass'y with new one.
Properly mount
housing (A).(B) set
according to the
reassembly procedure.
Replace the rotor ass'y
with new one.
Replace the rotor ass'y
with new one.
Properly insert the
connector cables of the
switch and battery
terminal.
Replace the stator FET
PCB ass'y.
Replace the flexible
ass'y with new one.
Replace the rotor ass'y
with new one.
Properly insert the
connector cable of the
switch panel.
Corrective action
Remove the cause of the
overloading.
Allow the tool and battery
to thoroughly cool.
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