I found this for the r75, the 818 uses the same synth.
Voice Synthesizer Volume Adjustment
VERSION 1.0 FOR THE ICOM R75
CAUTION: This procedure has not yet been tested.
DISCLAIMER: The author is not responsible for any
damage resulting from this procedure.
1. Abstract:
The following procedure alters the volume on the
optional UT-102 voice synthesizer.
2. Methods:
Turn the receiver off and remove the six case screws.
Using a plastic screwdriver adjust R1254 (see red
below). Replace the six case screws. Notice the M5282
amplifier (yellow) and R1254 resistor (red) in the
block, schematic, and picture.
WARNING: Only use a plastic screwdriver and DO NOT
drop screws into the unit.
----- Original Message -----
From: "tom behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, March 16, 2010 5:55 PM
Subject: Re: ic-718
> Butch:
>
> I swear there is an adjustment in one of the menus for UT102 volume.
>
> I seem to recall having that problem with mine too, but remember adjusting
> it. I had to, because it was a rig that I used for Field Day, and often
> in
> our motor home, so needed the volume to be a bit higher than usual.
>
> 73 from Tom Behler: KB8TYJ
>
> ----- Original Message -----
> From: "Butch Bussen" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, March 16, 2010 5:54 PM
> Subject: Re: ic-718
>
>
> I did go to a e s and bought the synthesizer and the i-100 tuner. I
> considred getting the at-100, but they didn't have one in stock and I
> wasn't sure what the up down manual tuning buttons did and all that, so I
> figured I'd keep it simple, just one button. On another note, the
> synthesizer works, but the level seems low. It is fine if you don't have
> much signal, but it is covered up by the noise unless I turn the rf gain
> down. Any suggestions? I called a e s and they said no level adjust on
> the board. I called icom and they are supposed to call me back.
>
> Yep, it is a nice little radio, nice for portable or mobile, just a simple
> little rig.
> 73
> Butch Bussen
> wa0vjr
> open Node 3148
> Las Vegas
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