In the following picture you can see typical oxidation of the filters (white spots over the plastic filter cases): Fig. Synthoms are the usual ones: static discharge noise, desensitization. It is clear that a review operation was made (by mama Yaesu) in order to add DC blocking capacitors (to avoid electron migration that seems to be the root cause of filters oxidation). I found a picture of a recent model that shows circuit surrounding the ceramic filters. ![]() ![]() ![]() Regarding this 857d I fixed for a friend, it seems the problem affected units produced some yars ago, but not the newest hardware releases. In this article I change the in(famous) 3 faulty Toko filters with Murata equivalent, due to the well known desensitization problem present in rigs such as Yaesu 857,897, kenwood ts2000, etc…
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