Johnson AFG Pro 7.2AT, Service Manual

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CHAPTER 3: Troubleshooting
3.3.3 TROUBLESHOOTING – NO RESPONSE FOR MACHINE (CONSOLE&MOTOR)
SOLUTION:
a. Check if the console beeps when all keys are pressed. If no, replace the keypads.
b. Enter Engineering Mode, and scroll to ENG 1 (Hardware Test).Press the key “ENTER” first and then
the key ”START”.
- When press the key “SPEED + / -“, if the data on windows “TIME” & “DISTANCE” is changed, the
console is ok. If not, replace the PCB.
c. Turn off the power switch, and open the motor upper cover. Remove the red & black wires of motor
from the MCB, and u se a multi-meter to measure the resistance of drive motor.
If the resistance is bigger than 10 Ω, the drive motor is defective. Replace the drive motor.
If the resistance is lower than 10 Ω, the drive motor is ok. Then,
- Check the connection of the speed sensor (encoder disk group) at the MCB.
- Remove the speed sensor from the motor and clean it, then re-test.
- If the speed sensor is clean and has a good connection but still will not operate, replace the speed
sensor.
- Replace the MCB as the last step if machine does still not run after to take above actions.