[ICOM] Icom 765 Problem
Gary Fiber
gfiber at comcast.net
Sat Oct 8 17:09:16 EDT 2005
Bruce,
Going from old memory its seems to me if the radio is upside down,
knobs facing you the audio amps are on the left side using the
chassis as the heat sink, they are T)-220 cases or similar and the
tabs are bolted to the chassis. There were two of them as I remember
the solder joints on the leads would get cracked.
Gary K8IZ
At 10:16 AM 10/8/2005, you wrote:
>Hi Paul,
>
>Do you recall which transistors in question, Icom schematic numbers?
>Appears that they are located on the main board, right?
>Was it a process to correct, did you need to remove the main board?
>
>Tnx - Bruce W1UJR
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
>Behalf Of paul at w8aef.com
>Sent: Friday, October 07, 2005 11:33 PM
>To: ICOM Reflector
>Subject: Re: [ICOM] Icom 765 Problem
>
>Check the audio output transistors for cold solder joints. My '765 had
>several, cold solder joints, that is.
>
>de Paul, W8AEF
>
>----- Original Message -----
>From: "Bruce J. Howes" <bhowes at suscom-maine.net>
>To: "'ICOM Reflector'" <icom at mailman.qth.net>
>Sent: Saturday, October 08, 2005 2:25 AM
>Subject: [ICOM] Icom 765 Problem
>
>
> > 765 #2 seems to have developed a bit of a problem.
> > I turned it on last night to very low audio, could hear the signals, but
> > at
> > a very low level, even with the AF gain full open.
> > Thinking that something may have happened to the speaker I removed the top
> > cover and inspected the connector and speaker, no fault found.
> > Just for good luck, and using a highly refined technique, I sharply rapped
> > the chassis, BINGO, audio output full bore.
> > Reinstalled the cover and she played fine for the rest of the evening.
> >
> > Tonight, similar problem, initial low audio, following by a good audio of
> > static crackling, almost like a thunderstorm.
> > I removed the antenna, static is still there.
> > The received audio, AM, sounds quite nice, aside from the static.
> >
> > Any suggestions?
> > Thought this might be a case of the PLL wax migration fault, but not sure
> > as
> > the audio is clear and not distorted.
> >
> > Tnx.
> >
> > 73 Bruce W1UJR
> >
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident
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