[Elecraft] Icom 735 inquiry

[wd4lst at windstream.net]

Bob,
I do not have any experience with an IC-735, but I did take on a IC-751 project a couple of years ago.
Icom has a fairly good web site where you should be able to download docs, schematics, etc. Also, I called them and for 25 bucks, they sent me a copy of the entire 751 doc library, including all mod sheets and upgrades, in house tech notes, and even fax communications between US and Japan offices. 
 If you choose to change the RAM battery, be careful and follow the correct proceedure. You have to attach an outside 
power source prior to unsoldering the battery, or the unit will go brain dead.
Other common repairs of that time are replacing Electrolytic caps on the power supplies (be aware that Icom uses multiple 8v supplies all over the place). Also, the plastic housed trimmer caps around the bfo tend to go bad.
Again, these are all things that I experienced with the 751.
It was a pretty good learning experience, but I since gave the radio away to an aspiring cw guy that needed a better receiver than what he had. 
Unless you are Just heart set on that radio, be careful not to spend too much on it, as the availability of replacement parts of that vintage is getting questionable.
Good Luck,
Pete
wd4lst

> 
> From: rlpend <rlpend at charter.net>
> Date: 2006/10/09 Mon PM 06:43:38 CDT
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] Icom 735 inquiry
> 
> This radio, which I purchased new and have not modified, worked fine 
> six months ago. Recently I discovered that it receives normally on all 
> bands, the LCD functions normally, and the CW sidetone is OK , but it 
> will transmit only on AM and FM.  On SSB and CW the power output meter 
> doesn't show "power out" and my field strength meter needle doesn't 
> move. However the fan does operate and the Icom power supply becomes 
> slightly warm when I attempt to transmit into the dummy load in these 
> latter two modes. This state of affairs is the same into the antenna 
> (when I discovered the problem) and into a dummy load. Years ago Icom 
> replace the power transistors when it would not transmit, but I believe 
> this failure was on all modes.
> 
> Any ideas where to look for the problem?
> 
> I am not an engineer or electronics technician, but have built many 
> kits. Any suggestions about what I can try before sending it away would 
> be appreciated.
> 
> Bob N5JYW
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Pete Axson
WD4LST
17901 NE 18th Ave
Citra, FL 32113