Connect the power switch, the power indicator. Loading CAM gear not turn (under normal circumstances, at the moment on the power switch, load motor through the CAM gear drive main stem and mode selection switch back to stop position after position detection), according to this phenomenon. Preliminary judge fault is due to mechanical device positioning confusion or disorder caused by the system control circuit work. For the judgment is a mechanical failure or control circuit fault, open the machine on the right side of the chassis, the main PCB, mechanical transmission mechanism in a stopped state observation, found that the CAM gear has shifted along the clockwise to end, mode selection switch arm is also moving to the left from the state stopped position to the fullest. Hand pull out dynamic load motor pulley make mode selection switch activity arm alignment v-shaped positioning marks (stop state location), mechanical device the positioning marks have been aligned, this machine mechanical device positioning itself does not exist, this time with warehouse down to lock. But at the moment to connect the power switch, load motor drives the CAM gear immediately and mode selection switch back broke open the machine to see the location of storehouse is automatically pop up again, visible fault in mode selection switch or system microprocessor control circuits. The control circuit and transmission mechanism as shown. FRxservice manual download site
 FRxservice manual download site
 FRxservice manual download site
Pop-up batteries, to load the motor pulley make way choice switches in a stopped state position, with a model 500 multimeter check the mode selection switch feet in the right way to positive and negative to resistance, found that the arm end (COM) in the right way to positive and negative to the resistance of 16 k respectively Ω and up, normal should be 1.5 k Ω and 25 k Ω respectively. Further examination revealed. Damage resistance R6057 has open circuit. Replace the resistor R6057 Ω (1 k) connected to the power switch, after machine work back to normal.

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