[ICOM] IC-765

[Gary Fiber]

When the audio is muted is the S-meter all the way  to 60db over S9?
I suspect the display is either the display going away or DP-6 on the 
display circuit board. DP-6 supplies -5 volts around inside the 
IC-765 so it could also be the cause of the audio muting though 
generally the S-Meter pegs when its goes bad. The bad part is 
generally cracked solder joints on the pins used to mount DP-6 to the 
display board. generally those joints are cracked in the DP-6 circuit 
board which requires removal.

Try sliding an external speaker connector and headphone connector in 
and out of the jacks a few times too.

Now will all that written it could also be the T/R relay, though 
generally you don't need to change bands for it to work, pressing the 
PTT and releasing it usually does the job. If only changing bands 
brings it out of this condition I might suspect a relay with in the 
antenna tuner unit.

Gary K8IZ

At 08:54 AM 11/11/2008, you wrote:
>I just acquired a 3900 S/N IC-765 as a second radio.  So far it's 
>working well and I'm enjoying it.  There are a couple of small 
>issues, that I can't find any reason for, that perhaps someone on 
>the list can shed some light on:
>
>Approximately 60% of the time when I power on the radio the audio is 
>"muted".  It's like the T/R relay is in the mute position.  If I 
>punch the 14 MHz button on the keypad and then go back to the 
>original band, audio is back to normal.
>
>The other oddity is the display which seems to be "dimmed" a 
>bit.  Each display section has segments with a "bright" portion and 
>a "dim" portion and comparing it to a friends radio, mine display is 
>visibly dimmer on both the white and red display elements.  With no 
>reference to display dimming in either the owners manual or the tech 
>service manual, I'm not sure what I have.
>
>Thanks for any help from the group.
>
>73, Mike W9MWS
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident