> On 24 Nov 2017, at 08:44, Adrian Graham via cctalk <cctalk@classiccmp.org> > wrote: > > >> On 24 Nov 2017, at 08:41, Brent Hilpert via cctalk <cctalk@classiccmp.org> >> wrote: >> >> On 2017-Nov-23, at 5:07 PM, Adrian Graham via cctalk wrote: >>>> On 23 Nov 2017, at 21:18, Brent Hilpert via cctalk <cctalk@classiccmp.org> >>>> wrote: >>>> ... >>>> You might check the contrast control. >>>> I can't find the actual schematic for the contrast control connections, >>>> but I 'm guessing the ends are connected across 12V (video board pins 5 & >>>> 1/4/10) and the wiper to video board pin 8. >>>> The contrast control can be expected to take pin 8 somewhere + to get >>>> pixels fully on. >>> >>> You’re right with pin 8, tracing the circuit I can see why someone >>> recommended I check Q101 and Q102 which look OK in my tester. >>> The contrast control itself tests OK resistance wise, it goes from pretty >>> much 0ohms to 610M. >> >> 610M ? >> I hope that M is a typo. >> > > Morning! > > It is, 610k or 0.6M :) >
Gah, ignore this. — Adrian/Witchy Binary Dinosaurs - Celebrating Computing History from 1972 onwards
