[ICOM] Bad IC-745 (again)

[Richard Peterson]

A word of advice: Do not EVER presume that Heathkit antenna switch you got 
at a flea market is good.

Miine, as it turned out, had been modified by a moron so that, when I hooked 
it up to switch my antenna, it provided output to the antenna (from my Drake 
TR-4 transceiver) as well as to my Icom 745. This means my Drake loaded into 
the antenna as well as into my Icom receiver circuitry. Therefore, the Icom 
is not working.

I studed the schematic and drew some conclusions, opened the Icom up, and 
confirmed what I feared -- the broadcast band filter is burned up. Since the 
preamp was out-of-circuit, it should be ok, and it looks ok, too. But my 
broadcast band filter capacitors, ahead of the switched filters, are burned 
up.

I am not so sure about the inductors, but the caps are gone, These are 
called "barrier lay" and I am not familair with them.

Should I attempt replacement with my common ceramics, or should I call up 
Icom. Any thoughts or experience with this?

LIkewise, can I replace the 1SS53's with a common 1N914? Thanks.

Richard
WB5NEN

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