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C. Problem determination：loose clips can easily lead to loose plugs, please fasten the clips after
the plugs are firmly inserted;
D. Conclusion: after the above three steps, check the side rail control panel, if it still unresponsive,
move to the Step 4.
Step 4, Check if the side rail control circuit board connector is loose
A. Check the content: side rail circuit board connector is loose;
B. Check method: peel off the cover sticker from the side rail control panel, using screwdriver
unscrew 4 screws, see pic.1-4;
Pic. 1-4
C. Problem determination: if the circuit board connector is loose, plug it in tightly, see pic.1-5;
connector
Pic. 1-5
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