Re: HP-97 card reader Message #2 Posted by David Smith on 27 Jan 2003, 5:54 p.m., in response to message #1 by Michel Beaulieu
The problem is most likely a bad tantalum capacitor. It is usually a small blue colored dipped tantalum. It is used to filter noise from the power supply. Over time it develops a high ESR and quits filtering, even though it will test as good. The value is not very critical. I have used anything from 3.3 to 10 uF. I think the original is around 4.7 uF. I usually use 6.8 uF because the local capacitor store had lots of them for cheap.
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