-------- Forwarded Message --------
> From: Sain'T Tom <DXHawg@windstream.net>
> To: geraldj@storm.weather.net
> Subject: Re: [TenTec] 242 VFO Problem...
> Date: Thu, 27 Mar 2008 08:18:48 -0400
> Jerry, K0CQ,
>
> Those transistors sre all MPS6514. They are general purpose transistors
> like 2N4402 2N2222, etc. Just about any general purpose transistor will
> work. 2N2222 probably is the most common. Just be sure you get the base,
> emmitter, and collectors in the right places. I have done that repair twice
> on the 242 VFO.
> This is by no means a rocket science repair.
>
>
> 73
> Tom K4RV
>
>
>
> ----- Original Message -----
> From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
> To: <tentec@contesting.com>
> Sent: Wednesday, March 26, 2008 8:13 PM
> Subject: Re: [TenTec] 242 VFO Problem...
>
>
> > On Wed, 2008-03-26 at 20:05 -0400, Louis Ciotti wrote:
> >> All,
> >>
> >> So I took the cover off and was probing around checking connections.
> >>
> >> I took the following data on voltages on the controller board at each
> >> transistor per the instructions. Mode 3 in the VFO position.
> >>
> >> Transistor | Collector | Base | Emitter |
> >> | T | R | T | R | T | R |
> >> ===============+=======+=======+=======+=======+=======+=======+
> >> Q1 | 0.37 | 13.78 | 0.8 | 0 | 0 | 0 |
> >> Q2 | 13.70 | 0.044 | 0.037 | 0.74 | 0 | 0 |
> >> Q3 | 13.70 | 13.80 | 13.7 | 13.8 | .221 | 0 |
> >> Q4 | 13.71 | 13.80 | 0.037 | 11.7 | 11.08 | 0 |
> >> Q5 | 0 | 11.09 | 0 | 5.06 | 0 | 4.33 |
> >> Q6 | 0 | 0.021 | 0 | -.035 | 0 | 3.72 |
> >> ---------------------------------------------------------------+
> >>
> >> It appears as if Some of the Transistors are bad on the Control board.
> >>
> >> Anyone have any part numbers for replacements??
> >>
> >> Thanks
> >>
> >> Lou
> >> KC2RVD
> >>
> >
> > Q3 could be bad unless the plastic cased transistor pins are not what
> > you expect. There is less consistency about pin locations with plastic
> > TO-92 transistors.
> >
> > 73, Jerry, K0CQ
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG.
> > Version: 7.5.519 / Virus Database: 269.22.1/1345 - Release Date: 3/26/2008
> > 6:50 PM
> >
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|