[DSP-10] DC voltages not right

[Jimmy Oldaker W7CQ]

Gene

Go to my web site and download the Initial tune up procedures for 
more information  on the setup.  It is the original article by W7PUA 
with the additions by myself and KO7N in red to further help in the 
setup.  You might check out link to Roger KA7EXM on the PLL too. It 
is very good reading too.

http://home.teleport.com/~oldaker/dsp10_repository.htm

Jimmy  W7CQ



At 06:15 PM 3/17/06, you wrote:
>I received a new MAR-3 in the mail from Daniel Schultz, so I was able
>  to finish my DSP-10 main board today.
>
>  Thanks Daniel!
>
>  I put 11V into the thing and...  well, no smoke, anyhow.
>
>  First thing I noitice is that it's drawing only 230 mA -- so I know I
>  have issues.
>
>  Checking the DC voltages I find a few problems:
>
>  U14 pins 2&13 read 5.37  (maybe close enough to 5.5?  dunno)
>  U1 and U2 pin 3 are both 0.013V (should be 3.5 and 4.7)
>  R110 reads 1.75V (should be 0.23)
>  U105 pin 3 reads 2.5V (should be 3.5)
>  U106 pin 3 read 4.77 (close enough to 4.6?  dunno)
>  R59 reads 1.4V (should be 0.91)
>  U8 pin 3 reads 2.5V (close enough to 2.8?  dunno)
>  U9 pin 3 reads 3.2V (close enough to 3.6?  dunno)
>
>  Everything else was spot on.
>
>  I'm still new to radio and kit building, so I'm sure I've done
>  something silly.  I'm going to quit for today and take a look at
>  things with fresh eyes tomorrow.
>
>  Any and all suggestions are welcome.  Thanks!
>
>   -- Gene
>
>
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   73's  -   W7CQ -   CN83jx