Recent content by antron

Crystal arrived early so I swapped it first and the board is up and running. Im surprised because the top layer of one of the eproms has completely come off. I expected to have to re-burn it. Thanks everyone!

I believe this is it. None of these inverters are outputting an oscillating signal. All are showing 1 point something, except the last, which is a solid 5V. I don't think the crystal is kicking. The inverter chain is getting an indeterminate input, but the last one gets a low enough input to...

Thanks everyone, I've got an inverter and oscillator ordered. I'll post how it goes.

Okay thanks for the cross reference!, I'm not get a usable pulse from any pin on the M53204P. I guess replacing it and/or the oscillator is the starting place.

Fluke multimeter for DC. The timescale from my analog discovery o-scope is shown. So about 1.5 Mhz. Also I deleted the schematic, see the example below from vectorcollector

Here is what I can gather so far. Deleted, had errors.

The 5v rail is good. The oscillator's 1.4V is coming straight from pin 1 of that m53204p I can't find a pinout for. The other leg goes through that RC network in the picture and into pin 2. I see now that the other leg has about 1V DC and they are both showing the attached 50mV waveform.

Hello, I am trying to repair a non working break thru board and the oscillator doesn't seem to be doing anything. Can someone help me identify and find a source for it? It says 12.000 UNI 86-C. I guessing it's a 12Mhz crystal oscillator. Will any 2 pin 12Mhz crystal oscillator work? Also...

I performed the modification on another WG 49 series chassis on the same tubes as before. This chassis looks identical to the first, but I could not get enough vertical height. So I changed R318 to 220 Ohms, and it looks great. I hope this doesn't push anything out of spec. The width was too...

The TV case I wanted to put the 4900 in wasn't shaped well to accommodate the chassis, so I tried it on a 20" Trinitron that I have. Yoke is 3.9 ohm H, 12 ohm V. It also works perfectly, just has that Trinitron look. I'm mainly posting this because I've seen many claims that this should not...

Did this today, 2.9 H, 11 V. All resistors as Jrok and C365 0.68 uF as Shupac. It's perfect. Thanks so much for this. I'm going to mount the chassis in the TV case with an isolation transformer and power supply and hang a jamma harness out of the back. My supergun is going to have a CRT.

bump bump bump bump

FS: CPS2 Street Fighter Zero 2 Alpha Conversion B Board $100 shipped in the US This is a CPS2 Street Fighter Alpha 2 B Board that has been ROM converted to a Zero 2 Alpha. It is phoenixed. This official hack, not releases in the US, features the "Dramatic Battle Mode" This allows both players...