> I just found this, so the answer is mid-2004 (point 2 below):
"mid-2004" would equate to a serial number starting 4Hxxxxxx.
Yaesu uses the same format for serial numbers in all of their
transceivers.
>From http://www.va3cr.net/1000mp/Tips/Material/SerialNumbers.htm
> Serial Numbers - Decoding
>
> Serial number format is YMLLUUUU where
> Y is the last digit of the year,
> M is the month with C = Jan, D = Feb and so on,
> LL is the lot number (CPU is programmed by lot number & service
> bulletins are also referenced by lot number, not date), and
> UUUU is the unit number within the lot.
73,
... Joe, W4TV
> -----Original Message-----
> From: yaesu-bounces@contesting.com
> [mailto:yaesu-bounces@contesting.com] On Behalf Of Bill Tippett
> Sent: Sunday, December 13, 2009 4:56 PM
> To: yaesu@contesting.com
> Subject: [Yaesu] FT-1000Mp Mrk V Key Factory Click Mod?
>
>
> I wrote:
>
> > I believe it was in the summer of 2003, but it could have
> been 2004. Since Yaesu never admitted there was a "key click
> problem" in all the years of FT-1000/MP/Mk V manufacturing, I
> doubt they would admit guilt and publicize when the Mark V
> mod was made.
>
> I just found this, so the answer is mid-2004 (point 2 below):
>
> http://www.va3cr.net/markv/Troubleshooting/KeyClicks.htm
>
>
> Key Clicks and the Mark V Field
>
> Hello from Gary NL7Y in Fairbanks, AK. Here's my tentative thoughts
> regarding the Yaesu key-click issue. I'm on my second Mark-V, the
> first was a used 2001 production 200W version, and the current is a
> Field model. I like both. The first blew up some stuff in in the
> output (tuner/finals/?), and that was apparently a common occurrence
> in some early models. According to Burghardt (Jim via phone), Yaesu
> was aware of the problem, but neglected to address the issue until it
> started to cost them $$$$ in warranty repairs. Contact Burghardt or
> Yaesu for details if you're so inclined. The current 200W models are
> apparently better, and the older ones are repairable. I returned mine
> to the selling dealer (The Ham Station - also an honest dealer) for a
> used equipment warranty refund, via Yaesu repair Service, and
> exchanged it for the Field model.
>
> I have the Inrad click mod ready to install, plus their roofing
> filter in the Field model. So, for the heck of it I just called Yaesu
> Service Support and was told that:
>
> 1. Installing the Inrad click mod would not void my warranty if
> properly done. The "Inrad stuff was good";
>
> 2. Yaesu addressed the key click issue in mid 2004 as referenced in
> an internal Service bulletin (number not available - I asked) read to
> me by the support technician, and;
>
> 3. Owners experiencing problems with their rigs need only return
> their unit to Yaesu for repair or upgrades. I didn't ask if it was a
> warranty item.
>
> I guess this means a "factory" fix is available, and interested Hams
> should contact Yaesu and see what Yaesu can do to help their
> customers. I'll likely not install the Inrad mod unless someone finds
> out something to the contrary. GL. 73 Gary
>
> Addendum: Someone forwarded some very good news from Burghardt Radio.
> I only wish Yaesu would publish the S/N's this is effective for.
> Better late than never! 73, Bill W4ZV
>
> Yes, recently Yaesu did install what is the equivalent of the Inrad
> CW keying mod in their new radios coming off the line. Can't tell you
> serial number change but it has been done on the ones coming off the
> line now. We have been installing it in all of our used ones for
> quite some time. 73 James C Smith (W0MJY) Burghardt Amateur Center
> sales at <http://www.burghardt-amateur.com>www.burghardt-amateur.com
>
>
>
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