Recent content by diesel64

Thanks for your suggestions! Hmm. I will inspect again, but I can't notice any burnt connectors. However, since I sanded the legs of the transitor, the game has only reset once (in about an hour of play). Before I couldn't play 5 minutes without resetting. As far as I know, that big grey...

Owkay... I removed the power transistor Q5, sanded the legs and put it back. This obviously changed the 12V line signal: It's not perfect yet, but I don't know how it should be on a perfectly working System 11? All I know is I just played for half an hour without any resets. Would you...

So if I'm correct the right kicker AND the sun flasher don't work? These are "Bank Selected Solenoids". They share the same driver transistor (they are not "on the same solenoid", as you suggested). This works generally as follows: a first driver transistor controls a relay. This relay will...

OK, I think I'm onto something here... I focussed on the power supply. I disconnected the logic power and measured the lines of the power supply. Both 5V and 12V looked pretty stable and in spec. However, after connecting the CPU board, I measured again. The 5V was still stable, but the 12V...

Hello everyone, I'm Kristof, I live in Belgium and I got into the pinball hobby only recently. :-) A couple of months I bought ago I bought a Road Kings that was working but the game wouldn't start. After replacing the column transistor that controls the outhole switch, things were working...

And suddenly the short is gone... I disconnected the 2 boards from each other and tested for continuity between the 5V and the ground on both of them and my multimeter doesn't beep on any. On the first board it gives a reading of about 75 Ohm, on the second of about 120 Ohm. When I connected...

OK, we've got a new development. I was just measuring some stuff (checking the input and output pins of some ROMs) when I noticed a smell. I turned off the power immediately and found out that some chips were running extremely hot. So hot that I burned my finger on one of them. The ones that...

Hmm, I keep replying to my own thread, but I'm doing this because it might help someone figure out a solution or it might help someone in the future having a similar problem. Terra Cresta basically has 3 collections of graphical ROMs: Tiles (characters and logos): located on 1 EPROM on board...

OK, I think I managed to figure out what ROMs contain the sprites. I looked a bit at the source code of the MAME driver for Terra Cresta ( see http://mamedev.org/source/src/mame/drivers/terracre.c.html ). This is a part of the section about loading the ROMs: ROM_REGION( 0x02000, "gfx1", 0 )...

Thanks for your comment! Problem is that I don't have any schematics or I can't find any online. :(

Hello everyone I'm relatively new to the hobby of PCB repairing and I am struggling with a Terra Cresta PCB. When I test it, I only get static text and images on the screen, no actual gameplay graphics. I do think the game runs fine actually. I checked my power supply, it's good. DIP...