Core tips£ºHua Liya TDL-2002ZA of electric motorcycle key switch very poor contact, sometimes loss of
This voltage via the D3 type TL494CN (16) foot. If (16) voltage greater than (15) feet, TL494CN (9), (10) foot output OV,T3, VF5~VF8 stop, wheel motors power failure stalled.
According to the above circuit fault TL494CN, LM558P pin voltage measured are shown in annex. TL494CN (9), (10) foot to 0V. No output and input terminal (16) voltage up to 12.9V of the feet, abnormal over-current or under-voltage protection is started obviously, making the TL494CN output. Op-amp LM358P (1), foot 13.5V, and (2) feet, detection of battery voltage input is 0V, further measurements of R2 (actually by 120K ω 12K ω resistor in series) is open. This voltage is 0V. After replacing it with a 150k ω resistor, and troubleshooting. Circuit TL494CN and LM358P pins on a normal working voltage, measured values are shown in annex. When you replace the resistor R2, failure has been ruled out.