Z80 Error and the YM2610

F

FusionITR

Krauser's Shoe Shiner
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Aug 18, 2005
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243
I just tried to use a MVS board I bought awhile ago and I get a Z80 Error screen when trying to boot the board.

I'm going to replace the Z80, the SRAM, 74245 latches, and the YM2610. I can't find a place where I can order a YM2610 replacement. Is there a newer direct pin-for-pin replacement for the YM2610?
 
N

Neo Ash

NG.com Audiophile, Club Member,
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Feb 21, 2004
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FusionITR said:
It is (or might be), but in the OP the issue I had was trying to find a direct replacement for the YM2610.
Click to expand...

My misunderstanding.

Send channelmaniac a PM, he most likely has a ton of these chips.
 
SetaSouji??

SetaSouji??

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Partwise, that sounds like it's going to cost as much as the board. Can you not send it back?
 
SetaSouji??

SetaSouji??

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Z80 - 7.99
YM2610 - 9.99
SRAM - about 4.99
latches - 3.99

Parts are looking at roughly 27. You'll also want to socket all these for easier repairs next time:

sockets - 1.99-4.99 each

Worst case scenario, there's another 20.

Now add in the time it's going to take you to do it, the solder, IF you fuck up part of it and have to do it over, etc.
 
Xian Xi

Xian Xi

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As long as it's not an MV1C.

An MV1C will give you a Z80 error on boot if no cart is inserted.
 
Kyuusaku

Kyuusaku

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Uh, please don't replace all those things, properly diagnose the problem so as to not waste parts. Most likely none of those are broken, particularly the 245 (which is not a latch, but a buffer.) The Z80's input latch is integrated into the C# ASIC, which cannot be easily replaced. Most likely you just have a broken trace.
 
Last edited:
channelmaniac

channelmaniac

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Most common cause #1: Scratched/gouged traces

Most common cause #2: Bad Z80 CPU

Now... do you get the error with NO cartridges in the system?

If yes, fix traces then replace Z80 if it's not a trace issue

If no, fix traces on bottom or top board... clean slots/carts.

If you don't get the error when there are no cartridges in the system then the Z80 and other digital sound area components are OK. If the sound program ROM is on the cartridge and it can't be read because of a bad trace or bad chip on the top board... or even a dirty cart/slot then you'll get the Z80 error.

It's *rare* to find a bad 2610.

RJ
 
Hewitson

Hewitson

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EvilEvoIX, from reading your question I can only assume you have no desoldering experience.

Get yourself a good solder sucker, and practice on plenty of scrap boards first. Failure to do so will almost definitely result in you damaging your board.

Better yet, since you don't even know if the Z80 is definitely the problem, send it to channelmaniac.
 
channelmaniac

channelmaniac

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Thanks Hewitson

EvilEvoIX, the CPU is bad or it's not. The only time I've ever seen one work then not work was when it was a thermal failure... It'd work when cold and then not when hot.

For your board, I'd suggest cleaning the carts and slots. If the connection isn't good then the Z80 can't boot from the sound program ROM on the cartridge which will cause the system to throw out that error message.

RJ
 
Hewitson

Hewitson

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You can't beat an old toothbruth and some 100% isopropyl alcohol (available at any electronics shop).

For cleaning carts, I recommend using cotton buds with the alcohol. The good thing about this stuff is unlike other chemicals it will leave absolutely no residue.
 
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