Johnson MC-J6900 - 5.11 Chair Back Reclines Abnormally; 5.12 Machine Core Movement Issue

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CHAPTER 5:TROUBLESHOOTING
5.11 Chair Back Reclines Abnormally
Solution :
1) Check if the armrest’s shortcut keys are seized.
If the frequency is high, replace the shortcut key board(1000228108).
If the frequency is low, press the keys to return to the original state and then observe.
2) Check if the manual controller’s keys are seized.
5.12 Machine Core Movement Issue
Symptom :
Normally it can come down but cannot go up; the condition also includes that it can go up but
cannot come down.
Solution :
1) Check the appearance of upper and lower limit switches for any damages.