Wow, great to hear that I'm not alone with this problem! :)
Thanks Rick for the thorough description of your problem that seems to fit
with mine...
Barry, regarding discrepancies between schematics and reality, in my
Corsair II, while debugging the OSC Mixer board,
I found that my IC mixer is different from the one written in the manual
and its pinout seems totally different!
Next time I open the radio I'll check the mixer part code.
Ah, before I forget it, my crystal oscillators are all a bit off frequency.
So every time I change the band the indicated f changes and it's correct
just on 20m where there is no crystal...
Any remedy?
73!
marco IS0KYB
2016-06-08 15:19 GMT+02:00 Barry N1EU <barry.n1eu@gmail.com>:
> Please send all Corsair II manual discrepancies to me as well. I've tried
> to compile a list of Corsair manual errata at
> http://corsair.wikidot.com/corsair-errata
>
> 73, Barry N1EU
>
> On Wed, Jun 8, 2016 at 8:49 AM, Reeve Family <reevefamily@cogeco.ca>
> wrote:
>
> > Yes Barry, I feel badly that I did not take photos to document that whole
> > LPF-TR board removal process. I would normally do that but was too
> heavily
> > involved in the trouble shooting process and not sure at the time where
> it
> > was leading.
> >
> >
> >
> > I did however make some notes and drawings at the time while I was
> > disassembling the Band Switch in order to get the LPF-TR board out of the
> > chassis. If you want I could try to scan and submit those.
> >
> >
> >
> > I must admit, I am not great with navigating and posting with online user
> > groups. Can you give me an email address that I should send .jpg or .pdf
> > files to in order to have them posted?
> >
> >
> >
> > While trouble shooting my problem I also discovered some changes on the
> > LPF-TR board regarding biasing resistors for the PIN diodes. I bought my
> > Corsair II new from a dealer at the Dayton Hamfest so presumably these
> > changes were done at the TEN TEC factory. I recall reading somewhere
> about
> > improvements to performance in PIN diode biasing, however I did not make
> > these changes to my Corsair and so can only presume they were made at the
> > factory but not documented by TEN TEC on the schematic.
> >
> >
> >
> > Regardless of who did the modification, here is what I found on the
> LPF-TR
> > board in my radio:
> >
> >
> >
> > 1. 470 ohm resistors were installed in series with D1 and D2
> >
> > 2. R3 had been changed from 330 ohms to a 100 ohm resistor
> >
> > 3. R6 had been changed from 150 ohms to a 47ohm resistor.
> >
> >
> >
> >
> >
> > It was a bit discouraging to find that the more details I looked into,
> the
> > more discrepancies I found with the schematics in my manual. Having said
> > that, I still love my Corsair II and will not likely ever part with it.
> > Accordingly, I have kept careful notes on every modification or repair
> ever
> > made to my Corsair in the 28 years that I have owned it.
> >
> >
> >
> > 73,
> >
> > Rick VE3ORY
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
> _______________________________________________
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>
--
marco cogoni
CRS4
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