Golden Axe PCB

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Sunder
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Golden Axe PCB

Postby Sunder » November 14th, 2017, 12:27 am

I've got a bum board.
Few questions for those who can help.
Are those really a series of 16 pin optocouplers there? The NEC 2501. They are all rusted off the board.
Also what's that 8 pin chip by A-1 on the motherboard? I can't see past all the oxidation on my board.
My first time on a Sega 16 board.
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Rossyra
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Re: Golden Axe PCB

Postby Rossyra » November 14th, 2017, 6:43 am

It sounds rough anyway but has it been desuicided?
Image
Sunder
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Re: Golden Axe PCB

Postby Sunder » November 14th, 2017, 10:06 am

Nope, does not look like it.
I'll take some proper clear photos and log my progress through it very soon.
Sunder
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Re: Golden Axe PCB

Postby Sunder » November 14th, 2017, 10:59 am

Rossyra wrote:It sounds rough anyway but has it been desuicided?

The FD1094 is corroded to hell anyway. It's like getting shot and run over by a truck right after. Haha.
Layer
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Re: Golden Axe PCB

Postby Layer » November 14th, 2017, 1:01 pm

The only component with 8 pins I can see in A1 area of a 16B mobo is a small Fujitsu MB3771 : www.alldatasheet.fr/datasheet-pdf/pdf/6 ... B3771.html
Sunder
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Re: Golden Axe PCB

Postby Sunder » November 14th, 2017, 1:38 pm

Layer wrote:The only component with 8 pins I can see in A1 area of a 16B mobo is a small Fujitsu MB3771 : http://www.alldatasheet.fr/datasheet-pd ... B3771.html


Thanks, mate. It helps a ton!
Layer
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Re: Golden Axe PCB

Postby Layer » November 14th, 2017, 2:50 pm

Are you talking about Nec PS2501-4 used for the input buttons ? You can replace them with 16 pins Sharp PC817 too.
Sunder
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Re: Golden Axe PCB

Postby Sunder » November 15th, 2017, 11:11 am

Thanks Layer.
I got the components on their way now. I'll make an update soon as I start the thing. Let me know if you guys spot anything I'm doing wrong.
Also I hear it's possible to just forgo the suicide chip and not have it on there at all?
Layer
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Re: Golden Axe PCB

Postby Layer » November 16th, 2017, 7:18 am

Yes, it is.

Depending of your game revision, you will have to replace the crypted FD block CPU with 68K CPU @ 10 MHz (in the case of a crypted main CPU) or with Z80 CPU @ 6 MHz (in the case of a crypted sound CPU) + the decrypted romset (program roms or sound roms) matching your game revision to burn and install too (you can find and grab the decrypted romset @ jammarcade.net).

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