Trouble Shooting Guide - Panasonic EY3654 Service Manual

EY3654

4 TROUBLE SHOOTING GUIDE

(Refer to WIRING CONNECTION DIAGRAM.)
CHECK POINTS FOR ELECTRICAL PARTS.
< TROUBLE >
→
Does not operate.
→
Does not
speedcontrol.
<CHECK BATTERY PACK.>
If no less than 7.2 V DC is available across the (+) and (-) terminals, 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
7.2 V 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 AND
Check for proper terminal contacts.
<CHECK MICRO SWITCH.>
(See WIRING CONNECTION DIAGRAM.)
1. When lever is slightly depressed;
* There should be continuity between (1) and (3).
* There is no continuity between (1) and (2) or (2) and (3).
2. When lever is not depressed;
* There should be continuity between (1) and (2).
* There is no continuity between (1) and (3) or (2) and (3).
<CHECK VAROAB;ERESOSTAMCE.>
Disconnect white leae wire coming from variable resistance.
There should be 50 ± 10kΩ between (A) and (C).
There should be 0 - 50 ± 10kΩ between (A) and (B).
Disconnect blue lead wire coming from module, if it shows wave
form as follows with (-) terminal and blue lead wire connected to 7.2V DC.
<CHECK FET CIRCUIT BLOCK.>
Check lead wire terminals. Disconnect lead wire.
The motor normally operates with its white (+) and black (-) lead wires connected to
7.2 V DC.
Ref.: motor rotating speed 13,700-18,000.
< CHECK >
↓ OK
BATTERY PACK.>
↓ OK
↓ OK
<CHECK MODULE.>
↓ OK
↓ OK
<CHECK MOTOR.>
6
NO < REMEDY >
→ Replace battery pack.
NO
→ Repair contacts.
NO
→ Replace micro switch.
NO
→ Replace variable
resistance.
NO
→ Replace drivingshaft
or cam A.
NO
→ Replace FET circuit.
NO
→ Replace motor.