7
B. Wind Direction Section
1. Check the following procedures for malfunction of the synchro-motor inside the sensor.
1) After turning off power of the indicator, take off the wires connected to the sensor terminals No. 3,
4, 5 and 6.
2) Check the resistance value between terminals with a tester. Switch tester range to resistance range.
* Synchro-motor secondary portion
Terminal
No. 3 and 4
about 260ohm
No. 3 and 5
about 260ohm
No. 4 and 5
about 260ohm
* Synchro-motor primary portion
Terminal
No. 6 and 7
about 150ohm
Normal if resistance values between terminals are near the values given above.
2. When the tail’s movement is dull and slow.
The ball-bearing is worn off or
rusted. Refer to the maintenance section.
