IO-4510 scope problem

[Wade Crowley]

On Mon, 20 Mar 2006, Ron wrote:

> Wade Crowley wrote:
> > The y1 and y2 trace position controls will only bring the line
> > up to 6 divisions below center. I checked voltages associated with
> > the controls and they seem ok,what would cause it in this or some other
> > model?
>
> Where did you check the voltages?

I first checked the voltages around the position controls,then on
the deflection board.  C was 170v and when I pulled back some
insulation to check D it was 80v,looked at C again and it was 78v!
so one of those leads to the CRT must be cracked..

that should do it,thanks for the advice


>
> I would start at the vertical deflection plates
> (points C and D on the Deflection PCB) with no
> signal. DC voltages should be equal more or less
> at center of position control. If not, I would
> work my way backward, measuring at each stage.
>
> Possible causes include out of balance +15V and
> -15V lines, unequal component values in the push
> pull circuit AND leaky transistor(s), to mention
> just a few.
>
> -- Ron
>
> -----------------------------------------------------------
> Products bought, sold or traded here is the responsibility of the
> parties involved.  This list and the City of Tempe are not responsible
> for losses or misrepresentations of any kind.  Buyer beware!
>
> -----------------------------------------------------------
> This list is a public service of the City of Tempe, Arizona
> -----------------------------------------------------------
>
> Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
> To post - HEATH at LISTSERV.TEMPE.GOV
> Archives - http://listserv.tempe.gov/archives/HEATH.html
>

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html