[TechAssist] Re: JVC TV AV2749S, anode HV level at 30kV- too high?
- From: Al L <alleathe@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 18 Aug 2003 11:39:30 -0400
Gary,
I would take a chance on it after running it for a few days.If you are
worried about liability,you would be dead meat if there was trouble and it
was obvious you modified the design.Get a good buck for it and good l;uck.
al
Al Leatherman
224 Rt. 46
Mine Hill, NJ. 07803
973-361-5796
WWW.ALS-TV.NET
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 18, 2003 10:29 AM
Subject: [TechAssist] JVC TV AV2749S, anode HV level at 30kV- too high?
> I have this JVC TV, model JVC TV AV2749S in the shop. I had to change
> the yoke because it was burnt. I used a 27" yoke that physically looked
> exactly the same except for the connectors so I switched the connectors
> over from bad yoke. The geometry of the picture looks fine except that
> the picture is too wide (by about an inch or more). I have no way of
> knowing if it is this yoke causing this, or if the problem existed
> before and possibly even caused the original yoke to fail.
>
> Here is the data I can provide:
>
> -HOT collector waveform : 1200V p-p -perfect looking (no blips)
>
> -HV anode: 30kV at zero beam current
>
> -regulated B+ at output of STR30130 regulator: 130.1 Vdc
>
> - temperature of HOT heatsink after 1 hour run,
> taken directly above the HOT case: 44 deg. C (119 deg. F)
>
> - temp of B+ reg. heatsink after 1 hour run: 55 deg. C (130 deg. F)
>
>
> - if I change C525, 0.0062uF 1600V at HOT collector to a 0.0051uF, the
> picture narrows by approx. 1 inch but the HOT collector waveform rises
> to 1250V p-p and the HV anode level goes to 31kV. The heatsink
> temperatures stay approx. the same.
>
>
> The main question I have: Is 30kV or even 31kV too high to safely run
> this set at? I'd like to get it closed up and outa here. Any opinions,
> please.
> --
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
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