[Icom] 746PRO Protection Diode Fix Confirm?

Thu May 6 23:12:29 EDT 2004

Joe,

The bad news is that many are of the opinion that the
diode mod is, in essence, a "feel good" mod, or ICOM's
attempt to demonstrate that they took a "positive
step" to correct this problem. 

Research done with regard to this problem indicates
that the real problem is a design issue, and lies with
abnormally high thermal dissipation in a PA driver IC
which causes early failure of the device. There have
been non-ICOM fixes published, to address this issue.

Here is a link that you may find interesting:

http://www.qsl.net/k5lxp/projects/746Pro/746ProNoTX.html

It would be interesting to see how many users have had
failures subsequent to the diode "ESD" mod being
performed.

73, Frank W3UHF

--- Joe <[email protected]> wrote:
> 
> 
> I just purchased a used IC-746PRO. It was at the
> Icom service center for a VFO knob problem in March
> 2003. Per the service center, in February 2003 the
> factory started adding the diodes in new radios and
> at the service center they also started adding the
> diodes to any radio that was in for service, but
> they do not have a document that states my radio had
> the diodes installed. They say they started in Feb
> 2003, so if my radio was there in Mar 2003 it should
> have the diodes installed, but the only way to make
> sure is to sent the radio back to them for testing,
> and there is no way I can look and see if they are
> in the radio.
> 
> So... does anyone know of a way I can confirm that
> the diodes are in my radio without sending it back
> to the service center?
> 
> Thanks,
> 
> Joe N9VX 
> 
> 
> 
> 
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