3 – Replacing the Ceramic Receive Filters in the Second IF Stage in a Yaesu FT-857D

This video is to describe the replacement of the crystal receive filters in the second IF stage in the receiver of an FT-857D. However, I also went in to further detail on the cause of the problem, show a video segment of a sample of the problem, as well as describe filter placements and functions by following the signal paths through the receiver stages from the antenna connectors to demodulation to AF within the block diagram, as well as illustrate more detail of the filter circuitry within the schematic diagram. There are many sources for the Technical Supplement/Service Manual for the radio. It should be easy to find doing a search online. The PN of the manual I referenced is: EH007M90A. One additional detail on the filters and DC voltage - as described with the mod and new style boards with the DC blocking caps - that is, technically, the proper installation/application of the filters. My reference to DC voltage not causing concerns in the video is correct from only the standpoint of non-contamin