I plugged up my Checkpoint this morning (had gone out of town for the week and it's thunderstorm season in the south, ya' know) and booted up. Everything came up fine and after a minute or so the display blanked out. I smelled that tell-tale smell that something had burned.
So, checked the fuses (took them out and toned them) and they are all good.
Tested the voltages on CN5 and they are good except for pin-4. It's supposed to be 68vdc and I'm getting 32.2vdc. So, it looks like I'm going to need to do a high-voltage rebuild somewhat.
My question is what components to replace? D9 I would think for sure (68v zener diode).
I connected the dmd to the resistors to test and they appear to be good (r11, r12, r15, r8). Now, r15 gets hot enough to cook on. It's a ceramic and I understand they get hot, but this is really hot and has turned the board around it a little brown. Could c10 be bad and causing this?
TR3 looked a little brown, too, but it's hard to tell.
I'm not sure how to test TR3.

IMG_6663.JPG

IMG_6664.JPG

So, how would you all recommend that I go about this? Right now I'm thinking about replacing C10, TR3 and D9. I'm open to suggestions since this is my first attempt at a data east power supply. Any advice is welcome. Thanks in advance!!!

I picked up C10, TR3 and D9 but haven't done the repair yet. A Rottendog board came up from a friend for $20 so I just grabbed that and was back in business. I'm still going to try this board repair so that I can have a backup. The game for this board is on route so it's going to be a while before I'll be able to test the repair.