Recent content by Postman723

You know, I once had a radio controlled car that fell into the pool when I was young and crazy. After that it never worked right. I then dunked it back the sink and soaked it for a few minutes, then dried it off with a hair drier for about 20 minutes. After that it was all better. I still am...

Colt, check the voltages again with a voltmeter set to measure "AC". The ripple voltages for the +12 and +5 should be under 0.1vrms on your meter. It would be better if you could see them on a scope if you are able. The +12v is derived from a 6000uf cap and the +5v is derived from a 20000uf...

Yes, this continues to happen even before the sound issue. I haven't verified the video roms yet, but I can do that next. I have found a source for the Video Rams (AM93422) at Mikes Arcade . The good news is that the video rams are also in sockets. My guess is that these rams went bad...

It would be helpful if you could tell us what kind of monitor you have. I converted a cab for use with my Capcom Bowling game and I had to switch around the yoke connections to the monitor to flip the video. I did this by reversing the horizontal yoke connectors on the board, then reversed the...

Does anyone know where I can find Capcom Bowling Schematics to the board. I found the installation manual online, but it doesn't include schematics. I need the schematics to try and troubleshoot my missing strike sound problem. Any ideas? Thanks again in advance.

OK Gents. I have a Capcom Bowling game with all sounds working but the "strike" sounds. Verified the Sound ROMs are good and need some advice on where to look next. Anyone seen this before? Let me know your thoughts. Thanks in advance.

Eureka!! OK, got it fixed. This is what I found: Scoped out the Address and Data signals to the Z80, Rom and Ram chips and all had activity. Then I scoped out the Chip Select signals going to the Rom and Ram chips. The B12 selects the ROM chips - that was ok, and the B13 chip selects the...

I have a SH upright that I am also rehabbing. I am a Chicago South sider. My power supply is working fine, the problem I am having is in the Super Sound I/O board. Perhaps we can work something out. If you will let me use some chips on your sound board to find out what's wrong with my board...

OK, the cables for J1 and 2 tested ok. I will try replacing 8910 chips after I find some (maybe at JDR micro devices). Will also look for M58725 ram (I have a feeling it is bad)... just a feeling. Anyone know where I can get a source for the M58725 ram or a similar replacement, please let me...

Thanks for the call back Sean and Tech9. Yes I am a newbie to this forum, but not to troubleshooting. Once game powers up there is a message that says something like "Sound board interface error". Did check and reseated ic in their sockets. Replaced Z80 with good one, but can't replace 8910...

Hi all, newbie here. I need help with a Spy hunter that has no gun or other normal game sounds other than the music theme. Any help will be appreciated. I have some experience repairing games, but this one has me stumped. Glad to be on board with the rest of you, and I will try to do my best...