Dear Collective,

I have a Hyperball which is mostly working except I have noticed a segment is missing on all of the alphanumeric displays.
It is segment k so not noticeable that much but now I have seen it, it’s going to annoy me.
I tried following the wiring schematics but I am struggling to find the problem.
Any pointers??
It’s missing on every one of the alphas, I’m not sure if it was missing when I first got it or if I have disturbed something.
Where’s the best place to start??

Thank you all in advance.

You Sir are a genius.

I cannot thank you enough, this is exactly what i was looking for.

I'll try these this evening and report back.

Reporting back.
I have connectivity from the control board 2J10 pin 9 right through to the alpha display 14J4 pin 9
With test mode on displaying the star display I have -70 volts on that pin with -36 volts on the other pins.

Thinking I have been looking at this upside down, now thinking it might be segment r instead

8D16C6B2-CB23-4246-B158-4D33ED9F95C0 (resized).jpeg

checked all diagonal segments r, n h and k respectively (whilst in test mode) at 2J10 pin 6, 2J10 pin 3, 2J11 pin 2 there is -35v on all. On 2J10 pin 9 i have -77v. What should these be??
I have -104v on pin 10 of both IC21 and IC14
I have 3.19v on pins 6, 4 and 1 of IC21 and 3.25v on pin 7 of IC14

I managed to find another alphanumeric display, plugged that in and segment r now works alas i have a different segment out on the replacement device so it must be a display issue rather than a board issue