SB610 and manuals for AM1 and SB604

[mark allison]

John King wrote:

> Hello Folks:
>
> Have sick SB610 monitor scope and no manual. Problem sounds like a ground
> missing or open pot. It has dot on screen about 1/2 inch in diameter and it
> is bright. The vertical position and horizontal position pots work and the
> trace can be moved with them. The Focus control doesn't work, The Intensity
> control doesn't work, the Vertical gain pot doesn't work and the Horizontal
> gain pot doesn't work. So sounds to me like the string of pots are
> effectively not in the circuit and are not varying the voltages to the
> elements of the CRT.
> WHAT DO YOU THINK??
>
> I could use a manual for the SB610, also Heath AM 1 impedeance bridge, and
> Heath SB 604 A.C. power supply for the SB 104A.  Please advise if you have
> any of these and if you are willing to part with one or a copy.
>
> Please reply via email direct. Thanks and 73, John, K5PGW
>
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Have had a similar problem with mine, I found ot to be down to the high value
resistors.  I had to replace all of the 1 meg ones as the had gone low in
value, around 100 K or so,  also the 330K ones had virtually doubled their
values.  I havent had any need to change any of the others, most have stayed
within there tolerances.

hope this helps

mark allison
G0BTP

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