[ICOM] IC-735 Intermittent Problem ??

[GGLL]

	Most likely the trimmer capacitor for that band segment VCO section is the 
problem. It's a known, and common problem. You must replace it, and a good 
advice is to replace them all (4), because sooner or later the others will 
fail. After replacement, an easy re-adjustment is in order, in the service 
manual you find the instructions to do it.
If you want to get the service manual you could reach it at  www.mods.dk , 
Icom manual section; it's a 25 MB+ file.

Best regards
Guillermo - LU8EYW.

Michael Crestohl escribió:
> Hello Gang:
> 
> I am trying to troubleshoot my IC-735 that has a problem I am trying to
> troubleshoot.  However I don't have a schematic or service manual so
> it's difficult to try to track down the source of the problem.  I am 
> wondering
> if someone on this Reflector has experienced a similar problem and perhaps
> can save me some hair pulling and gnashing of teeth trying to figure it 
> out.
> 
> The radio's functions all work perfectly below 15 MHz and above 22 MHz.
> However both the RX and TX are dead only from 15MHz to 22 MHz.  This
> is intermittent and sometimes both TX and RX functions are normal.  I
> cannot see anything that causes this to happen, ie: switches, VFO, change
> from RX to TX, etc. It just comes and goes without apparent reason.
> 
> Obviously there are some circuits that are common only to this range of
> frequencies only and I am figuring it logically must lie somewhere 
> within that
> common circuitry.  However without documentation it will be hard to 
> track this
> down.
> 
> Can anyone offer any suggestions or information that might help me fix this
> annoying problem?
> 
> 73,
> 
> Michael, W1RC
> 
> W1RC*at*verizon*dot*net
> 
> 
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