4 TROUBLESHOOTING GUIDE
(Refer to WIRING CONNECTION DIAGRAM)
<TROUBLE > 
Does not operate.
Does not speed- control or does not brake.
→
→
<CHECK >
<CHECK BATTERY PACK.>
If no less than 12V DC is available across the (+) and
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 12V 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
AND BATTERY PACK.>
Check for proper terminal contacts.
↓OK
<CHECK SWITCH BLOCK.>
(See .WIRING CONNECTION DIAGRAM.)
Check continuity between following terminals.
*Inspection of the forward / reverse selection switch. 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.
-There should be 0Ω between (A) - (D) , and between (B) - (C) ; when switch lever is set to foward side.
*Inspection of the brake.
When switch handle is not depressed:
-There should be 0Ω between (A) - (B) .
↓OK
<CHECK MOTOR.>
It is OK if motor rotates 22,200 ± 2,800rpm with
NOTE: It is OK if motor rotates slowly when connecting 3V DC between white and black lead wires.
<CHECK FET.>
Even if FET block is defective, it can not be replaced individually. Replace whole switch block.
<REMEDY >
NO Replace battery pack.
→
NO Repair contacts.
→
NO Contacts in switch block
→are defective. Replace switch & FET block.
NO Replace motor.
→
NO Repair the contact or
→replace switch & FET block.
7
