I downloaded a copy of the repair manual from another thread on this forum and have just spent most of a week swapping electrolytic caps and trying in vane to get the voltages down to somewhere near normal, were I should be getting +200V my meter (set on 1000 volts!) is going off the scale to the point were last night I burned 2 resistors out in it. Everything thing else seems to work Ok, X and Y position, registers an input on the screen from A and B input but the trace is so big you just can't tell what it is. A couple of weeks ago I went to use it and the dot on the screen got bigger and bigger to the point were after 5 minutes it was just a solid block of green light on the screen about an inch high accompanied by a buzzing noise on pressing the "locate" button. I got it home plugged it in and it worked OK, so I gave it a good clean up and put it away (in the house in the warm). I recently purchased an old Scopex 14D-10 from the mid 1970's from a car boot sale, paid next to nothing for it so wasn't expecting much as it was filthy dusty and looked like it hadn't been used in years.
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