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Author Topic: help w/Kortek 1703  (Read 4734 times)
vinnywv
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« on: November 12, 2009, 01:28:11 PM »
Need help with a Kortek 1703 that pulses green after warmed up for a few minutes.  Tried a new neck board to no avail.  Like I said, it is fine until it runs for about 3 or 4 minutes.  Any suggestions out there?
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Ken Layton
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« Reply #1 on: November 12, 2009, 03:56:29 PM »
Have you put the tube on a rejuvenator to test it to confirm tube problems?
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vinnywv
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« Reply #2 on: November 12, 2009, 04:29:44 PM »
Nope. Don't have one.
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Ken Layton
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« Reply #3 on: November 12, 2009, 05:33:57 PM »
Has the monitor been recapped?
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vinnywv
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« Reply #4 on: November 12, 2009, 05:41:44 PM »
Yes, found a few that were suspect, but nothing obvious.  Changed c406, c126, c107 and c108.  When focusing (after trying another neckboard), the problem reappeared.  Thinking the flyback is weak?  Going to swap that now.  I'm fairly new at this and don't have much testing equipment (meter and cap analyzer), so going through as logical as I can.  Thanks for the quick replies.
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Firebird
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« Reply #5 on: November 30, 2009, 02:14:23 AM »
I would first try changing these caps, some are different than what is in the board, but believe me they will save you a lot of headaches in the future.
C107 - 47uf, 50v
C108 - 1uf, 50v
C123 - 1000uf, 16v
C126 - 470uf, 16v
C408 - 22uf, 160v
C421 - 10uf, 160v (always replace this if you replace the H.O.T.)
C506 - 47uf, 50v
C508 - 100uf, 50v

Also, do you have another monitor that takes that board? If so, try putting that board into the other chassis to confirm that the problem is not on the board.
I had a monitor do that to me and all of the guns in the tube died except the green.
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