Sounds like the capacitor may be the problem. To test it remove one wire from the cap then connect ohmmeter to the terminals, resistance should rise then read OL. Also there is ev100 and ev100lx, easiest way to tell is whether there are trim pots(non lx) or a port to connect a handset(lx). And verify the card type(Letter(s)) on the silver sticker is the same on your new card.
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