- Joined
- Aug 25, 2010
- Posts
- 624
I'm having some back luck with my boards lately, I hooked up my xmen pcb to find that the image is scrambled and out of sync.
I picked up a Elenco LP-560 logic probe...no idea how to effectively use it...and found some schematics for the board online:
http://aurcade.com/games/manuals/00000458.pdf
On page 15 at the bottom there's a drawing showing jamma pinout P being CSNYC, then going to chip LS367 (on the board it's labeled SN74LS367AN). I think this is the datasheet for it on page 224.
http://www.onecircuit.com/sites/default/files/1/LS_TTL-DataBook.pdf
I get the following reading when i test the pins on the LS367 chip:
Pin:
1: lo
2: nothing
3: hi
4: nothing
5: hi
6: nothing
7: hi
8: lo
9: hi
10: hi/lo pulsing, low pitch beeping noise.
11: nothing
12: nothing
13: nothing
14: nothing
15: nothing
16: hi
Does anybody have any advice on what or how I should be checking on this board?
thanks!
I picked up a Elenco LP-560 logic probe...no idea how to effectively use it...and found some schematics for the board online:
http://aurcade.com/games/manuals/00000458.pdf
On page 15 at the bottom there's a drawing showing jamma pinout P being CSNYC, then going to chip LS367 (on the board it's labeled SN74LS367AN). I think this is the datasheet for it on page 224.
http://www.onecircuit.com/sites/default/files/1/LS_TTL-DataBook.pdf
I get the following reading when i test the pins on the LS367 chip:
Pin:
1: lo
2: nothing
3: hi
4: nothing
5: hi
6: nothing
7: hi
8: lo
9: hi
10: hi/lo pulsing, low pitch beeping noise.
11: nothing
12: nothing
13: nothing
14: nothing
15: nothing
16: hi
Does anybody have any advice on what or how I should be checking on this board?
thanks!
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