HiFirst, the voltage rating is MAX working, so a 400 or 600 volt cap will be just fine, a bit bigger and cost more but that is OK most of the tie. The AC voltage part is a bit bothersome, so I ask what part of the circuit is it in? And now for the question not asked yet: Are you planning on replacing that part? Or duplicating the circuit? Do you think that it has failed? Or what?? The best choice for a cpacitor type depends quite a bit on the application.
HiA low value capacitor would not be tested the same as electrolytic capacitors, it it were, the results would be totally different. The value is far different and the type is totally different.
What I think I see is that the label on the board calls that capacitor "CP1", an encapsulated component, and elsewhere as a mylar capacitor. And it is connected across the power switch, explaining the AC rating.
No matter if a capacitor in that position was open or shorted or leaky, the running would not be affected by it. So probably that capacitor is OK, and the problem is elsewhere. So since the motor runs when given a push start, check the power supply voltages, since the symptom is not quite enough torque. It may also be that the power switch has failed. The manual gives a lot of assistance and so reading it is a good start.
Randomly checking components is a terribly inefficient way to do trouble shooting and seldom produces results in the first few hundred checks.
Since the turn table drive motor runs it is reasonable that most of the parts are OK, and that ALL of the critical parts are at least close to OK. So then you need to consider what it does not do, which is start by itself. That points towards either a weak starting circuit or else just not quite enough torque. It might even be from poor lubrication in a bearing causing excessive drag.
NO, it is not just a synchronous motor, it is an AC servomotor driven by the electronics portion of the system. LOOK AT THE CIRCUIT!! The motor is driven by the transistors fed by the DC power supply. AND read the description in that service manual. Reading is important, without reading it is very hard to know very much!!Agreed about the capacitor. It will still work without it.
Is there power to BOTH windings on the motor? It's a synchronous motor, so it will run on one winding once it has started.
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by Jake Hertz
by Jake Hertz