[ICOM] Bad IC-745 (again)

[T. Brad Smith]

Call Scott Malcom his phone number is listed on his page here:
http://www.angelfire.com/biz2/mts/

He is a very knowledgeable person and also will discuss such matters on the
Phone.  He is the MOST Trusted person I've found for ICOM questions and
solutions.

-- 
de KA5CDJ,  T. Brad Smith,  M.A.R.I.E. El Paso
Life Member ARRL, Texas VHF/FM Society
Member Armadillo Intertie
KA5CDJ.COM
W5DPD.ORG

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Richard Peterson
Sent: Saturday, August 25, 2007 2:09 PM
To: icom at mailman.qth.net
Subject: [ICOM] Bad IC-745 (again)

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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