In message <008d01c02697$6bb4c4a0$ecc8a7cb@joe>, Jinx
<joecolquitt@CLEAR.NET.NZ> writes
>I've rescued a couple of good 12" colour monitors due to be
>biffed out because the focus can't be adjusted anymore. The
>pot on the transformer is at the C/W limit. Is there a reason why
>I can't add a resistor in series with the lead that goes to the tube
>PCB or will this just make the focus even more O/S. Is the
>problem that there's too much resistance already ?

The focus control is a potentiometer fed via a high value resistor at
the top with another high value resistor down to ground from the bottom.
Assuming the bottom resistor has gone high, you could perhaps add a
resistor from the focus output down to ground to compensate, but it's
more usual that the top resistor goes high and you get too little
voltage.
--

Nigel.

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