From: Bob W7AVK 
Subject: Re: [drakelist] TR7 and DR7


Bob W7AVK  made an utterence to the drakelist gang
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Steve - the 10R and !0T lines are switched by a pair of small 
transistors that like to act like fuses if there is something wrong on 
either of the buses.

Do some checking along these buses for a blown bypass cap, etc.

Good luck,

73  Bob  W7AVK
http://www.atnet.net/~rsrolfne [Extender Cards]

Scpmiller{at}aol.com wrote:

> Scpmiller{at}aol.com made an utterence to the drakelist gang
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> I have had my TR7 for a couple of years and recently it quit.  Seems  like 
> the 10R and 10T line are both on at the same time.  The frequency  reads OK but 
> I cannot seem to receive anything.  
> I pulled the DR7 to look at the xmit exciter board.  Couldn't tell if  the 
> switching transistors were good or bad.  
> Had a terrible moment putting the DR7 back in when the cable that goes  
> through it got trapped underneath it and even though I had it plugged
in there  was 
> still enough slack to get between the board and the chassis.  You  guessed 
> it: no display. 
>  I turned the radio off as fast as I could when I realized what had  
> happened.  I straightened everything out, reinstalled the DR 7 again (now I  am 
> getting good at this) and the radio played including the  display. (Phew!!)
>  But still does not seem to switch between transmit and receive.   What and 
> how do I check to determine where this problem is centered.
>  
> Nice to be on the list.  I have had my 4B since 78 and my C-line since  82.  
> Would love another TR7 and someday an R7.
>  
> Steve KD2ED
> ----------------------------------------------------------------------
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> 

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On Behalf of Bob W7AVK 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
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