[Icom] 761 Help

Sat, 12 Apr 2003 02:46:12 -0500

Hi Clif,

Well here is the latest..

After changing the VCO trimmers and lytics, the receiver is working fine.
The transmit works fair in SSB with about 50 watts output with the
compressor off and nothing at all with it on.

I have about 4 watts out on RTTY and nothing on CW, AM.

I have changed Q 14 on the RF board as well as some .1 caps.  The voltages
are correct on the various diodes.

I have checked the voltages on the PA unit and they are all correct.

I traced the signal with a scope from J 8 on the RF board to the predriver,
drivers, and the outputs and each stage increases on the scope.

I still keep thinking that the problem is low output at J 8 on the RF
board.  What is the RF level that should be at J 8?

Any good ideas would be appreciated.

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 Clif
Sent: Friday, April 11, 2003 2:07 PM
To: [email protected]
Subject: Re: [Icom] 761 Help

Look closely at C174, C179.

Clif Holland,  KA5IPF
AVVid
Authorized Kenwood and Icom Service
www.avvid.com
1-800-214-5779
972-554-6801
----- Original Message -----
From: "wjdiamond" <[email protected]>
To: <[email protected]>
Sent: Friday, April 11, 2003 12:02 PM
Subject: RE: [Icom] 761 Help

> Hi Cliff,
>
> Thanks.   From the amount of previous soldering on the RF board in the
area
> of the diodes someone has been in there before searching for the problem.
>
> At this point, I am about to replace all the associated diodes with the
> correct ones from Icom as I have no way to tell if the right diodes were
> even installed by whomever.
>
> I suspect that several people have tried to fix this one.
>
> 73 to all
>
>         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 Clif
> Sent: Friday, April 11, 2003 8:24 AM
> To: [email protected]
> Subject: Re: [Icom] 761 Help
>
>
> The schematic is correct, figure out why yours is wrong.
>
> Clif Holland,  KA5IPF
> AVVid
> Authorized Kenwood and Icom Service
> www.avvid.com
> 1-800-214-5779
> 972-554-6801
> ----- Original Message -----
> From: "wjdiamond" <[email protected]>
> To: "Icom@Mailman. Qth. Net" <[email protected]>
> Sent: Thursday, April 10, 2003 10:52 PM
> Subject: [Icom] 761 Help
>
>
> > Hi Gang,
> >
> > Now I am really perplexed.  The reading that I get on each side of
Diode
> D
> > 47 are exactly opposite of what they should be.
> >
> > According to Icom and the manual the cathode side should read 9.4 RX
and
> > 9.7 TX
> >
> > The Anode side should be 8.8 RX and 13.8 TX
> >
> > Mine reads the exact opposite I guess the black band is still the
cathode
> > today as in many years ago. I always considered the Anode side to look
> like
> > an arrow on the schematic.
> >
> > This is a weird diode also it is a M 1204 and I cannot find a cross for
> it
> > anywhere.
> >
> > What am I missing??
> >
> > Thanks
> >
> >         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/
>
>
> ----
> 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/