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4 TROUBLESHOOTING GUIDE
< TROUBLE >
Does not operate.
→ If no less than 18V DC is available across the (+) and (-) terminals
Does not speed-
→ Follow the procedure above "CHECK SWITCH".
control.
<CHECK BATTERY PACK.>
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
<CHECK TERMINAL CONNECTIONS BETWEEN MAIN UNIT
Check for proper terminal contacts.
<CHECK SWITCH BLOCK.>
(See WIRING CONNECTION DIAGRAM.)
Check continuity between following terminals.
1) Inspection of the switch operated contact.
When switch handle is depressed all the way:
-
There should be 0Ω between (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 0Ω between (A) - (B)
<CHECK CARBON BRUSH.>
1) The condition of carbon brush.
-
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.
<CHECK MOTOR ROTOR.>
Check the condition of rotor if there is any wear, crack and deformation.
<CHECK MOTOR STATOR.>
Check the condition of motor case if there is any crack and deformation.
<CHECK SWITCH.>
Attach the battery pack and confirm the switch operation
when depressing the switch handle little by little.
< CHECK >
↓OK
AND BATTERY PACK.>
↓OK
↓OK
↓OK
↓OK
7
EY3544-U1
< REMEDY >
NO Replace battery pack.
→
NO Repair contacts.
→
NO Contacts in switch block
→
are defective.
Replace switch &
FET block.
NO Replace carbon
→
brushes.
NO Replace motor
→
rotor assembly.
NO Replace motor
→
stator.
NO Repair the contact
→
or replace switch
& FET block.
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