Could it be the that any of the power lines sags as the signal tries to increase to the right (in the picture right where the line is) or that any of the resistors in the amplifier chain has an incorrect value?
/Martin On Saturday 22 June 2024 at 11:32:21 UTC+2 Max DN wrote: > Tried to replace a few more parts, including potentiometers for Focus and > Intensity, made no difference. So, back to basics: using an oscilloscope I > see that the X and Y signals straight out of the DAC look exactly the same > as in the picture I had attached. Maybe a faulty DAC? Tried to replace the > DAC twice with new ones and made no difference. Looks like I'm hitting some > sort of physical limits... More debugging to do... > > Il giorno venerdì 21 giugno 2024 alle 18:31:51 UTC+1 Max DN ha scritto: > >> Hello, >> >> I'm building a scope clock, same board as another one I built before with >> no issues (after some help I got on this group, thank you!) and I'm getting >> a flat line on the display. >> >> I have tried replacing the CRT, the DAC, the Op Amps and the MPSW42 >> deflection amplifiers but made no difference. CRT is 3RP1A. Code and >> circuitry have been fully tested on another working board. >> >> I do recall having a similar issue before with a DH3/91 CRT and I seem to >> recall that I just needed to adjust the pot for Astigmatism that controls >> the voltage on A2. Schematics as in here: >> http://www.cathodecorner.com/sctv/sctv-schem-2.png >> >> I'm a bit at a loss here, although I'm sure it's something simple that >> I'm missing. >> >> Pic attached. >> >> Any suggestions welcome, >> >> Max >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/07f85701-6668-4415-bb0e-1bc8a8ea8e8an%40googlegroups.com.
