[Icom] IC 761

Mon, 7 Apr 2003 22:34:47 -0500

Hi Tony,

Yep, 12 V sure beats the 1000 VDC in the Collins rigs...

73

        William J. Diamond (Bill)
        Rogers, Arkansas USA
        [email protected]

        Ham Radio Operator WR�T
      Flying The Flag Long Before
            It Was Popular
   Please Visit My New Icom Radio Page

 http://pages.sbcglobal.net/wjdiamond/index.html

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Tony Hwang
Sent: Monday, April 07, 2003 10:20 PM
To: [email protected]
Subject: Re: [Icom] IC 761

Hi,
That little guy is known weak link. I had to replace it twice on my 765
B4 I installed heavier one even with
clip on heat sink. Sorry I had to mention it the first time. I used a
final power xsistor out of an old CB radio.
It is working fine since.
Now you know it inside out, hi. Working on low voltages, there is no
zapping by HV.
73,
Tony, VE6CGX

wjdiamond wrote:

>Hi Folks,
>
>Well, I am finding out more about the ailing 761. If I follow the proper
>procedure in the book for setting the driver and final current, ( in SSB
>not RTTY) they adjust properly.
>
>Troubleshooting using a scope reveals there is no RF at J8 on the RF unit
>board, thus there is nothing at the PA module.  I think someone had just
>turned the bias wide open so some output would show on a meter to sell it.
>
>It would appear that Q14, the broadband amp on the RF unit is open. I am
>awaiting a replacement now.  Sure glad I have a dual trace scope..
>
>More later....
>
>        William J. Diamond (Bill)
>        Rogers, Arkansas USA
>        [email protected]
>
>        Ham Radio Operator WR�T
>      Flying The Flag Long Before
>            It Was Popular
>   Please Visit My New Icom Radio Page
>
> http://pages.sbcglobal.net/wjdiamond/index.html
>
>
>----
>Your Moderator: Dick Flanagan W6OLD, [email protected]
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>
>

----
Your Moderator: Dick Flanagan W6OLD, [email protected]
Icom Users Net: Sundays, 1700Z, 14.315 MHz
Icom FAQ: http://www.qsl.net/icom/