[TenTec] [Fwd: Re: 242 VFO Problem...]

[Dr. Gerald N. Johnson]

-------- Forwarded Message --------
> From: Sain'T Tom <DXHawg at windstream.net>
> To: geraldj at 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 at storm.weather.net>
> To: <tentec at 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
> >
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