Shinobi has no sound

scott1982

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Hi there I have a Shinobi game that is playing with no sound :( I checked the dip switch settings and there all good. When I turn the dial on the volume control you can hear the speaker making like a cracking noise. Bad speaker? Bad sound card? Your help would be greatly appreciated. Thanks.
 
There are many causes to this type of problem on Shinobi.

The most common one is a suicide battery. Does it have a normal Z80B CPU on it or does it have one of those thick units with a battery inside the top?

Thick unit = suicide. Replace the chip with a normal Z80-B or C (Not Z80 or Z80A, you need the faster rating of the B or C) and replace the sound program ROM with one from a suicide free version that you'll find in the MAME archives.

Thin, normal Z80B CPU? Check for damaged traces on the bottom of the board. Make sure the ROM board is seated properly and that the pins between the 2 boards aren't damaged. Make sure there aren't any damaged traces on top of the ROM board or top of the main board.

If the traces are OK then check the CPU. Sometimes the Z80 will fail and the sound will stop working. I've also seen these boards with a bad SRAM chip (next to the Z80) and a bad clock divider chip. A logic probe or oscilloscope would help you check the clock for the CPU.

RJ
 
or if you want a working boardset pulled from a working converted cab lmk... i think i have the pcb, edge connector, and cut down marquee as well...
 
Same problem...

I'm bumping this old thread up because I'm having the same problem as the OP. The only difference is that I already got Bob's Shinobi Z80 and sound rom, set them in and am still getting the same high crackling/buzz from the speaker. I tried a different speaker, same thing and the power supply is a new switcher.

Any advice on what else could cause the loss of sound? How could I check the chips I got from Bob to make sure they're not bad out the gate?

Thanks.
 
I'm bumping this old thread up because I'm having the same problem as the OP. The only difference is that I already got Bob's Shinobi Z80 and sound rom, set them in and am still getting the same high crackling/buzz from the speaker. I tried a different speaker, same thing and the power supply is a new switcher.

Any advice on what else could cause the loss of sound? How could I check the chips I got from Bob to make sure they're not bad out the gate?

Thanks.


I got bobs for my Altered beast, and have no audio as well, i get humming iirc tho and the volume pot was still good because it got quieter or louder depending on which way i turned it. Another member here on the forum was nice enough to burn me another sound rom and mail it free of charge but that too didn't work. I've since just left it as is, and am patiently waiting my golden axe to suffer the same fate. F'n suicide batteries i tell ya ( i'm flipping it the bird).
 
This is my first and only Sega game. I got it for free last Summer needing a new power supply and WG4900 chassis. Replaced them, the cracked in half marquee and straightened the tweaked coin door. The only thing left now is the sound. Going to print up whatever I can for the board and wiring and see if I can track down the problem.
 
post a picture of the board. If it has the big black hitachi block on it, that is your issue. I have a Shinobi PCB with the same issue.
 
Didn't have the suicide battery installed when I got it, just an empty socket.

I printed up the manual and found out that the +12v on the power supply isn't hooked up. The manual says the +12v runs the sound. Going to wire it up to the pcb and see what I get.
 
Check the thin traces that run all the way around the mainboard. Sega carried the audio signal from the ROM chips in the upper board to the sound CPU by the most fragile traces on the board, then they decided to run them right next to a screw hole! (There's no way that would ever be a problem) :p

Here is my Altered Beast board, I circled the problem on mine in red:
imag0556d.jpg


And heres a close up of the damage:
imag0557x.jpg


It looks passable upon a visual inspection, but when tested for continuity, the three outermost traces fail. I ran new connections on the bottom of the board and the sound came right back up.

Brian.
 
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