[TenTec] 242 VFO Problem...

[Dr. Gerald N. Johnson]

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