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Overhaul the main motor, replace bearings if necessary.

Check the heater is working properly, replace the heater if necessary.

Check and adjust the pad, pull out the screw to check whether the interference screw.

The main motor can not start

Reason:

Startup procedure is wrong.

The main motor thread in question, whether the fuse burned ring.

Interlock device associated with the main motor works

Approach: