Kdsp2 Problem - Initial Checkout No Go

[pusbeck]

Hi,
    I hope someone can help me out with my KDSP2. On page 18 during initial checkout of unit and at the "rtc " display, I am unable to turn it on. That is , EDIT followed by BAND doesn't turn unit on. On power up of K2, the LED does come on briefly and turns off. AFIL held shows "not installed". I went to trouble shoot section in manual and did everything under error message ( removed U1, checked for bent pins, unwanted solder bridges, parts installed properly and in correct placement, and voltages on U1. Turned power on and off with no change. I did have a KAF installed before the DSP2 and it worked very well with no problems. The voltages present on U1 are:
                      PIN 5 = 5.02 V  ( should be 0 )

                      Pin 14 = 0 V  ( should be 5.0 v )
                      Pin 15 - 19 = 5.02 V  ( should be 0 V )
                      Pin 20 - 24 =   OK Voltages
                      Pin 25 = 0.2 - 0.4 V  (should be 0 V )
                      Pin 27 = 5.04 V    ( should be 0 V )
                      Pins 26 + 28 = 0 V   OK
K2 does have 2.04P and IOC 1.09 firmware upgrades. K2 was a version A ( pre-3000) and did A to B upgrade).
 This could be a Lyle Johnson solution but I'll take suggestions from anyone who has encountered a similar problem with their KDSP2.
   
   73, Pete
          KB2OFC  
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[lbailey]

Pete....Looks like Easter weekend is pretty slow for getting help with
your problem.  Guess the tekkies are out of pocket.  Unfortunately, I have
not gone down the DSP road yet, so I'm not much help.  In fact, I ordered
the DSP accessory & the A to B upgrade for my K2/100 (#1411) on Friday.

Looks like you've provided some good trouble-shooting information.  The
wrong voltages on the U-1 must be indicating a problem somewhere.

I had a problem with one of my options & I contacted Elecraft Tech help &
they sent me a replacement IC since the problem sounded like a b/o IC.
Sure enough that was the problem.

Another way to ck for bad solder joints would be to use a digital camera &
shoot some shots that you could print out or just look at on computer
screen.

Good luck, I'll be watching to see what the problem is.

73 de K5AVJ
Lynn

==============================================
Hi,
    I hope someone can help me out with my KDSP2. On page 18 during
initial
checkout of unit and at the "rtc " display, I am unable to turn it on.
That is
, EDIT followed by BAND doesn't turn unit on. On power up of K2, the LED
does
come on briefly and turns off. AFIL held shows "not installed". I went to
trouble shoot section in manual and did everything under error message (
removed U1, checked for bent pins, unwanted solder bridges, parts
installed
properly and in correct placement, and voltages on U1. Turned power on and
off
with no change. I did have a KAF installed before the DSP2 and it worked
very
well with no problems.
=============================================
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Post to: [hidden email]
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Subscriber Info (Addr. Change, sub, unsub etc.):
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Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com