GUS_Classic_2.4.jpg Well I got lucky on the electrolytic caps I found a txt doc I made before ordering it had all values. I would be willing to share for all if people need it. But I still dont have any values for the Ceramic capacitors. Thanks guys. GravisGUS2point4filled.jpg Here's a few more …

UP2.jpg So I did some deductive logic and took a shot, the card is detected in dos through the setup program!! But when I try and fill all banks with memory it locks up the memory check. if I only fill 3/4 it detects all 768kb ram. I can get the irq tests to pass, but the dma test always fails. i …

The idea, if I'm understanding his intent, is to make sure you have only one source of 5V, and to connect it with only one very short (1 cm or less) piece of very thin wire, so that if something goes wrong, it will (hopefully) break the connection, somewhat like a fuse. The wire you're using …

It wouldnt surprise me if one of the 74 logic chips is dead. I see this on arcade boards _all_ the time. I also found these from the site I ordered my memory from. http://www.arcadecomponents.com/catalog/item/2251648/1705685.htm / http://www.arcadecomponents.com/catalog/item/2251648/1705284.htm / …

360 ohm resistance is pretty low, but not low enough to cause traces to blow up. I'd say that normal resistance between VCC and GND should be at least in kilo-ohms range, eg. 2k+ would be totally fine. As long as there is no dead-short on board, you could try testing that card in a PC, just strip …

I imagine someone put the DRAM chips backwards in the card and that's why the traces burned out. 360...370ohm is ok between GND and 5V and nothing that can produce any burnout. That particular resistor looks like it is part of signal path of some sort and shouldn't be anything to worry about. Thank …

It wouldnt surprise me if one of the 74 logic chips is dead. I see this on arcade boards _all_ the time. Thank you for your reply. Are the chips I circled in my picture what you're talking about? I found these on OctoPart : https://octopart.com/t74ls05b1-stmicroelectronics-40887023 / https:// …

The Resistance between the +5 rail and GND is about 360 to 370 Ohms. I can probe all the VCC and GND on the chips in the board and find this resistance too. The only trouble is I don't know what resistance I should be expecting? I can also tell you that the resistor I circled before is shorted to …

Measure resistance between +5V rail and GND, maybe shorting component was already removed, eg. RAM. If that's not the case and resistance between +5V and GND is very low, then strip everything possible from a board and remeasure resistance. If it became way higher, then most likely you've removed …

Nope. It's the B side. I'm constantly confusing my self with the pinouts of sockets and card edge. Okay... so both B3 and B29 which I bridged are the +5V So with the picture. I was probing around with my multimeter and found the resistor which I circled. Which is a Red Red Red Gold Resistor which …

Thank you for your replies. "For start, remove red wire you've added, also that solder blob on the edge. Once done, solder a short jumper wire as thin as possible in the blobs place, that would act like a fuse. Connect low voltage power source, a 3.3v rail from ATX PSU would do, inspect element(s) …

It looks like if there was a component that would be bad it would be C39 on the front of the card closest to the notch in the card edge. It looks fine. Is there a way I can test whether that capacitor is bad or not with out desoldering it?

As you can see the one Bridge with the wire in red insulation wasn't a big deal. How ever I found the second smaller bridge with the wire in black to be quite difficult. There was a bit of trace on the board that was connected to the pin on the card edge. Not much to work with and it shortened it …

Hello, I just received a Gravis UltraSound Classic 2.4 that I purchased untested with no ram for a good price. I should receive the 8 20 pin dip 44256 drams for it in a few days. I took a glance at it when I received the card and noticed two spots where the traces looked rather dark. Sure enough, …