Question about Two-Way Radios
If your fuse is blowing as soon as power is supplied, then the problem is on your " rectifier unit " board. This is a voltage doubler circuit, and either one of the four diodes (D1-D2-D3-D4) is shorted. One of their filters (C21 or C22) could also be shorted, and may have lead to the destruction of one of the above mentioned diodes. After finding and making repairs, I would suggest bringing the unit up with a variac, while monitoring the AC amperage that will be drawn. Hope this helps. Jim
Posted on Oct 01, 2008
There are so many possibilities as to the cause of your fuse blowing that I feel compelled to refer you to other owners of TS 820 transceivers. You will be best advised through them. These radios are thirty five years old and have their power supply capacitors dry out, for instance. Many have had modifications and some have had abusive treatment ruin them. There is HT doubling circuitry which could leave you open to about a kilovolt in and around the capacitors and this can easily kill you. There is a group which exists on the internet which can help you further. I suggest you search it out. Make a search under your transceiver's name. 73 de Bob VK4GCA
Posted on May 02, 2008
Look in the rectifire section of the power supply (the bridge rectifire).
Posted on Feb 05, 2008
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