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From: JW on 11 Dec 2009 05:09
Repairing a Wayne Kerr 3245 inductance analyzer that has a bad CRT
board. C311 located between the yoke connector and the flyback
transformer is missing - judging from the capacitor "fuzz" all over the
board it looks like it exploded. There are no remains inside the unit so
I can't identify what the cap's value and voltage was, but it was a
largish one about 3/4" in diameter that's in series with a heavy
inductor and the yoke itself. The deflection board is marked:
Computron 115DMX 36-138-01B. I do have a service manual, and it covers
two different deflection boards, but of course neither one is close to
the board in this unit. Emails to Wayne Kerr have been ignored for the
most part.

I suppose someone has removed the part's remains, but never repaired the
analyzer. Does anyone have any service data on this board or have one that
they could take a look at to get the caps value? I believe that this
monitor assembly was used in many other devices as well.

Thanks for any help.
From: whit3rd on 11 Dec 2009 16:51
On Dec 11, 2:09 am, JW <n...(a)dev.null> wrote:
> Repairing a Wayne Kerr 3245 inductance analyzer that has a bad CRT
> board. C311 located between the yoke connector and the flyback
> transformer is missing - judging from the capacitor "fuzz" all over the
> board it looks like it exploded.
....
> The deflection board is marked:
> Computron 115DMX 36-138-01B. I do have a service manual, and it covers
> two different deflection boards, but of course neither one is close to
> the board in this unit. Emails to Wayne Kerr have been ignored for the
> most part.

So, can you reverse-engineer using the manuals? If the capacitor
is part of the vertical-deflection circuitry, and the ICs that drive
that vertical deflection match one of your service-manual examples,
the component value should be easy to find. You may need to
trace wires, of course.

In my experience, the big capacitor near the yoke connector
is for vertical deflection...
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