Search results

Do RunRun is working again! the bit from E6 pin14 floated at 2.5V. So I changed the 4164 IC from E6. D6 was wrongly unsoldered by me. But that was okay. I put it on a socket and built it back. Many thanks to the Arcade friends who helped with the repair. :)

I was wrong. when I see that, PIN 3 and 4 on the SN74LS161AN are on GND. Sure that they then have 0 volts. on the SN74LS74AN PIN 2 is also on GND ... but the 0.05 volts at PIN3 make me wonder ... Does somebody has any idea?

Hello, there are graphics problems with my Do RunRun. I checked out the board. Noticeable are a SN74LS74AN and a SN74LS161AN. With the SN74LS74AN there were 5 volts at PIN 14 normally, but at PIN 2 I have 0 volts and at PIN 3 only 0.05 volts ... I don't think so much ... The values are...

Hello, would like to recreate the battery patch for SunA's Hard Head. Does anyone know if the schematics exist on the internet? Original and bootleg: Batterie Patch:

Done! The sound works again ... :) In the end it was the defective capacitor in front of the AMP and a bug in the wiring. The pinout is wrong. The bootleg version I have has 2 x Speaker + (where GND should actually be)... <X Now the sound is good...

The 8190 chips seem fine. The sound on the potentiometer is normal and not overdriven, but quiet. I have now also installed another AMP because I thought the new one was not okay, but that's not it, I have the same error. The soldering eyes at the location of the AMP dissolve. Not good quality...

The 8910 are responsible for the sound. At some PINS I can pick up the sound clearly and distinctly. The chips seems fine. There is no OP AMP on this board. The place would have been on R6. Only a resistor was soldered in there...

Okay thanks, I check this. As I said, I am a beginner in repairs, but would like to make it

I never dared to do PCB repairs ... but now it's time I got further. Admittedly, I don't have a lot of knowledge and I'm still at the beginning. But I want to try. I get tools one by one. For this purpose I bought a cheap Skywolf that has no sound, and on the left there is a strange white...

My name is Markus and I come from Germany. I have been doing the arcade hobby for over 20 years, but I was interested in arcade cabs when I was a child. At that time I said to myself that I would like to have such a cab at home someday. Well, one cab turned into many ... and lots of spare parts...