Johnson MC-J6900 - 5.9 Machine Core Motor Does Not Work

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CHAPTER 5:TROUBLESHOOTING
5.9 Machine Core Motor Does Not Work
Solution :
1) First, rule out that the internal thermal protection of motor is caused by long-time operation
2) Use manual mode to force the motor to start, checking if it can be started.
3) Enter P2 (refer to2-2) to check if the sensor corresponding to the poor motor triggers the
limit.
For example, when the front and back machine core motors cannot move forward, it is required
to note that if the front limit lamp signal is triggered; when the front limit lamp is on, it represents that
the lower control panel thinks that the machine core is at its foremost position and cannot go more
forward.
If the front limit light is triggered when the motor position does not touch the front limit, sensor
might be damaged, the sensor piece position is poor, or connecting line contact is poor.