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Micro Seiki DD30 - Lift solenoid
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<blockquote data-quote="ludo" data-source="post: 256251" data-attributes="member: 691"><p>One of the measurements is not making sense. That's usually good news.</p><p></p><p>If the arm is lowered and you get 0.6V from Q2 collector (tab) to gnd, then it indicates good health in the transistors. (They're doing their thing, so they're all off the hook for now.) However, at this point there should be about a 12V drop across the solenoid, not 6V. </p><p></p><p>If your 6 Volt measurement is correct, then it indicates that the power supply (to the solenoid) drops from around 12V when the solenoid is off (evidenced by the 11.6-12.05V collector voltage on Q2 then) to around 6V when you activate the solenoid. That could explain why the solenoid is weak, but the problem must be upstream from the solenoid then, in the power supply. The supply voltage apparently "collapses" when current is drawn by the solenoid.</p><p></p><p>Where does that red wire on the solenoid come from? Perhaps from a vrot cap?</p></blockquote><p></p>
[QUOTE="ludo, post: 256251, member: 691"] One of the measurements is not making sense. That's usually good news. If the arm is lowered and you get 0.6V from Q2 collector (tab) to gnd, then it indicates good health in the transistors. (They're doing their thing, so they're all off the hook for now.) However, at this point there should be about a 12V drop across the solenoid, not 6V. If your 6 Volt measurement is correct, then it indicates that the power supply (to the solenoid) drops from around 12V when the solenoid is off (evidenced by the 11.6-12.05V collector voltage on Q2 then) to around 6V when you activate the solenoid. That could explain why the solenoid is weak, but the problem must be upstream from the solenoid then, in the power supply. The supply voltage apparently "collapses" when current is drawn by the solenoid. Where does that red wire on the solenoid come from? Perhaps from a vrot cap? [/QUOTE]
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Micro Seiki DD30 - Lift solenoid
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