[ICOM] Bad TX audio on 775

[Jim M.]

Are we sure it's really the microphone circuit and not the radio's "monitor" 
function - where transmit audio is fed back into the headset from the radio? 
Is this distortion actually heard on the air, or just in the monitor 
headphones?


----- Original Message ----- 
From: "Jim M." <jmiller1706 at cfl.rr.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Saturday, October 14, 2006 11:47 AM
Subject: Re: [ICOM] Bad TX audio on 775


> Are you using an "amplified" microphone? - If so it could be overdriving 
> the input.
>
>
> ----- Original Message ----- 
> From: "Igor Sokolov" <ua9cdc at r66.ru>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Saturday, October 14, 2006 6:01 AM
> Subject: [ICOM] Bad TX audio on 775
>
>
>> Posting this for a friend:
>> His 775 got some distorted audio on TX. Careful tracing led  him to 
>> suspect
>> IC8 M5282FP audio amp.
>> Service manual says pin 2 of the IC should be at 3.8V while in practice 
>> it
>> is only 2.6V.
>> Does anybody know where  I can get data sheet on the IC?  Where one can 
>> get
>> this IC from? Do you thing it is the IC or  rather some parts (resistors,
>> capacitors) associated with this IC?
>> Any help would be appreciated.
>>
>> 73, Igor UA9CDC
>>
>> ----
>> 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/
>
> ----
> 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/