[Drake] TR-7 problems

[Larry Taft]

OK, that means the Q306 307 R/T transistors are working properly.
Could be a pin diode switch isn't so trans audio/RF is getting into the 
receive audio.  Look around the 2nd IF /audio board to make sure the 
audio is muted.

And for general overhaul, do the unplug replug the boards trick.  Many 
problems are caused by poor pin contacts.
Just pull each board up an 1/8 inch and push it in a couple of times.  
If you pull one too far be careful to be sure your pins and sockets are 
lined up.  Bending a bunch of those pins makes for a long night at the 
bench.

73, Larry  K2LT
drakerepair.com

Transmaster wrote:
> Well the voltages and at the test points are as fallows:
>
> Receive:  9.99 VDC on the receive trace, 6 mv on the transmit trace
> Transmit: 9.99 VDC on the transmit trace and 19.6 mv of the receive 
> trace.
>
> Ken
>
>
> On 2/15/07, LeeCraner at aol.com <LeeCraner at aol.com> wrote:
>> In a message dated 02/15/2007 12:02:44 AM Pacific Standard Time,
>> ltaft at charter.net writes:
>>
>>
>> At least it has parts that can be seen with the
>>  naked eye.
>>
>>
>>  After having to repair an SG2020 under a microscope, I can attest to 
>> this
>> benefit!
>>
>>  73
>>  Lee WB6SSW
>
>