Help with 1-slot Z80 Error

[SNK4EVER]

I recently bought another cab with a 1-slot motherboard, it's one of the newer models. Anyway, the picture output was perfect until I decided to try it out on a friends cab. When we hooked it up and turned it on it went straight to a black screen that said Z80 Error. Then we turned it off and then back on, and the graphics were garbled with vertical lines going through everything. So I thought it must not be compatible with his cab and proceeded to hook it back up on my cab, but the same thing happens. Verticle lines going through everything. Anyone have any idea what might have gotten messed up?

 

[Arakon]

he either had a multislot cab and you fried some part of the sound circuit, or the voltage was too high. either way it'll be hard to track down the problem.. can't help you beyond that. the z80 is the sound cpu in the neogeo, btw.

 

[SNK4EVER]

Okay it might have been a z30 error, I can't remember exactly. It couldn't be a problem with the sound because it is perfect. Also, my friends cab was a 1-slot like mine, and his pcb runs just fine. If it helps at all, some of the images appear correctly and some are garbled up. I didn't smell any burning anywhere when it happened, so I don't believe anything got fried.

 

[LastResort]

First of all it could be a bad contact on the connector so check that first.

Second make sure the jamma connector fits perfectly on the MVS motherboard, usually jamma connectors are made a bit bigger and it's easely to make a short circuit on the connector that way, most of the times when that happens the MVS board will no longer funcion like it did before without smelling anything burned.

Third: try to clean the MVS cart connector
maybe also a reason for giving bad contact
between the MVS board and the cart

That's all i can think off with this information.

LastResort

 

[mainman]

Oh man another busted board with a Z80 error that makes two post cases this week, more evidence for my case these boards are prone to problems. I fell your pain, I'm on my sixth MVS unit, my priors died of work ram errors.

 

[JMKurtz]

Sounds just like a response I posted to another question, but check to make sure that the small board that the cart plugs into is tight where it plugs into the main board.

These boards form an "L" shape, and where the cart port board plugs in, sometimes it gets a little loose and will cause these types of errors.

Jeff

 

[SNK4EVER]

Okay, I forgot to mention I did test it out on my 4-slot before I tried it on my friends cab. And, it worked just fine. It didn't bring up the Z80 error or have garbled graphics till I took it over to my friends. Jeff: the connections are all nice and tight on the board, so it's not because of a loose connection.

 

[SNK4EVER]

bump