4 TROUBLESHOOTING GUIDE

< TROUBLE > < CHECK > < REMEDY >
Does not operate. <CHECK BATTERY PACK.> NO Replace battery pack.
→If no less than 18V DC is available across the (+) and (-) terminals →
after charging for the rated charging time
(approx. 65 minutes for EY9250), the battery pack is OK.
NOTE: The battery pack is sold separately as an optional accessory.
See the nearest sales dealer for details. The battery pack has a
limited life.
The pack should be replaced if;
-after being charged for the rated charging time the battery
voltage is less than 18V DC or the usable time is extremely short.
-the battery leaks. Check battery for leaks and terminals for
corrosion
↓OK
<CHECK TERMINAL CONNECTIONS BETWEEN MAIN UNIT NO Repair contacts.
AND BATTERY PACK.> →
Check for proper terminal contacts.
↓OK
<CHECK SWITCH BLOCK.> NO Contacts in switch block
(See WIRING CONNECTION DIAGRAM.) →are defective.
Check continuity between following terminals. Replace switch &
1) Inspection of the switch operated contact. FET block.
When switch handle is depressed all the way:
-There should be 0Ωbetween (A) - (D) , and between (B) - (C) ;
when switch lever is set to forward side.
2) Inspection of the brake.
When switch handle is not depressed:
-There should be 0Ωbetween (A) - (B)
↓OK
<CHECK CARBON BRUSH.> NO Replace carbon
1) The condition of carbon brush. →brushes.
-There should be more than 1mm from the line of the carbon brush.
2) The continuity of carbon brush.
-There should be 0Ωbetween the motor lead wire and the
metal fitting of carbon brush.
↓OK
<CHECK MOTOR ROTOR.> NO Replace motor
Check the condition of rotor if there is any wear, crack and deformation. →rotor assembly.
↓OK
<CHECK MOTOR STATOR.> NO Replace motor
Check the condition of motor case if there is any crack and deformation. →stator.
Does not speed- <CHECK SWITCH.> NO Repair the contact
control. →Follow the procedure above “CHECK SWITCH”. →or replace switch
Attach the battery pack and confirm the switch operation & FET block.
when depressing the switch handle little by little.

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EY3544-U1