[Elecraft] Q7 base problem solved! Thanks Don

[Tim Logan]

Don Lerche was right and I thank him so much! Although I could not SEE 
the short I disconnected the T4 windings one by one until the Q7 base 
resistance shot up to 2.6k. Then I resoldered one by one - measuring Q7 
after each new solder joint. Finally I redid all of the page 71 
measurements and I'm back in business! It is so nice to be able to get 
some help on a Sunday afternoon and go to Alignment Part III!!!!
73/Tim NZ7C

Don Lerche wrote:

>Tim,
>
>Yes, the resistance should be between 2500 & 3000 ohms. As you say a short
>on Q7 itself should be obvious, so if nothing looks bad, then after having a
>look at the schematic a good place to look may be around T4. There is a
>ground connection to winding 3-4, so a short around here to winding 5-6
>would put a ground onto the base of Q7.
>
>Good hunting
>
>73 Don, M1DIC
>K2/100 #3082
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net
>[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of nz7c at cox.net
>Sent: 30 January 2005 18:56
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] Q7 base resistance test - low reading
>
>
>Hi folks -
>I just completed the RF board and am doing the resistance checks on page 71.
>For Q7 base it requires 2.5 - 3.0 k.  My DVM onky meausres  .4 ohms - no
>where near 2300 - 3000 ohms. I assume this means I have a short.  There is
>no short between the soldered pads on Q7 and I rechecked the mounting screw
>hardware to make sure each part was correctly in place. All other
>measurements for the RF board are OK.
>Not being anything but a paint-by-number solderer, am I reading the table
>correctly? That does mean 2500 - 3000 ohms write?  If so, I very stumped
>because a short on this component should be very obvious - but I don't see
>it. Can someone offer some help please? Thank you very much in advance.
>73/Tim NZ7C
>
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