[ICOM] Icom 765 Problem

[Bruce J. Howes]

Thanks Gary, right on target.
Removed the lower cover this evening, found the ICs bolted to the case.
Tomorrow I will remove the main unit so I can properly rework the solder
connections.
Of course will report back to the board with the results.

Is this the same Gary who as a tech support rep for Icom?
If so, I owe you many thanks, you helped me on a number of occasions, and
are one of the major reasons I bought and continue to buy Icom products.

73 Bruce W1UJR (ex KG2IC) 

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Gary Fiber
Sent: Saturday, October 08, 2005 5:09 PM
To: ICOM Reflector
Subject: RE: [ICOM] Icom 765 Problem

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 Icom FAQ: 
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>
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net Icom 
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident


----
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