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Having some troubles with my first Netdimm at Naomi

mickschen said:
I asked my self why the Dreamcast, which is naomis daughter pcb, need only 60watt maximum, but naomi need 600?
Click to expand...
I have psu 350 watt .. it won’t power Naomi and nett dimm
My 550 watt will

So maybe it’s amps I do t know
But the 350 watt is a dell brand. Won’t work with Naomi + net dimm

Powers just Naomi great

Corsair 550watt works great naomi + net dimm

I have more than 8 naomi set ups
6 net dimms etc…. It don’t matter what Naomi or Naomi + dimms / net dimms …. Same symptoms.
 
Making sure your netdimm & Naomi are
Connecting together well is imperative.



If you don’t have screws yet. Then you can hold it in place just to see if you get video on boot up … or place a book on it.

Buying a good psu. Not a waste of money
( rule out bad psu being your culprit for Naomi not working )

It’s a process of elimination.

Buying a good multi meter. A good use of money. 😎👍


Do you know how to check the gdrom boot mode / network boot mode jumpers inside the netdimm ?
 
Tried everything i wrote before.

Netboot, no networkt or dimm settings

Gdrom boot, no picture and i see that the naomi is not really booting cause the jvs usb adabter is not stopping with blinking led which normaly ends after few seconds...
 
Did you buy the GDROM drive untested as well?

Since you already have a multimeter, how about testing those voltages? That should have been your first step.

Set your multimeter to DC voltage and put your black meter lead on a ground point and the red meter lead on the voltage that you want to measure. Ideally you want to measure as close to the system as you can.

On a Naomi I would measure from the filter board power connectors:

naomi_measuring_voltage.jpg


Brown wire is +3.3V
Yellow +5V
Red +12V
 
I will test it soon, the atx psu should be fine, cause it from a working pc before, but i will test it.

No only the netdimm was untested.

I know that the gd drive dont spin the disk, that is what i can tell.
 
PC power supplies with non-adjustable voltages are not ideal for arcade hardware. It's not about power, it's about how well the PSU regulates the outputs. For voltage regulation to work you need power wiring with minimal voltage drop. With an arcade PSU you can always counter this by raising the voltage.

Anyway, measure the voltages and we can make better guesses on what's wrong.
 
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I have an adapter pcb, from atx to naomi.



For gd drive a attached the 4 cables to gd drive pins from a Molex Cable.
 
If you tried attaching a picture, there isn't one.

You do know that standard ATX wiring color is not the same as the one Sega uses?
 
Im at work, i will test the power with multi meter soon and make few pictures from my setup at home.

I do t work with "colors", i read which cables has which voltage, and then i worked with gd rom drive pinout specs.
 
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Bear in mind there can be situations where the NetDimm is fine and it's actually a fault with the Naomi. I say this as I have a Naomi 2 that doesn't seem to detect any NetDimm, (well, it knows there's something plugged in but it fails to initialise, I can't remember the exact error code I get), but it plays the one cartridge I have no problem.

I collected a few NetDimms thinking the first one I got was faulty or needed the buffer chip replacing, but then got a second Naomi 2 unit and every NetDimm I acquired works fine on that one, so the first unit has some weird as-yet-undiagnosed issue, but only seems to affect NetDimms so far.
 
Okey.

So except the gdrom fail, here or some pictures and some questions.

What are the LEDs on the upper pcb up for? It looks like only for ethernet connections. Cause 3 of the 4 led blinking and shining when a raspberry or pc it connected to net dimm.

I have screws now but same issues.

And what standard ip has the netdimm? I would try a update with pc, but then i need the correctly ip and i would try it with standard ip.

And its not nessesary on which region the naomi jumpers from multi bios are or?

Then, what hase the jumper on the second pcb for functions? You can only see this jumper when you put the PCB apart.
 

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Security chip can be non working also.

You won’t know unless you can read the pic chip ?
Or test in another net dimm

Net work info here
https://8bitplus.co.uk/projects/netboot-sega-naomi-netdimm/




Jumpers on the lower pcb are for diffrent size memory stick settings


Yeh when no network shows up I would try re seating the memory stick.

If not working you could try getting new memory or a new security pic for the network dimm
 
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mickschen said:
And what standard ip has the netdimm? I would try a update with pc, but then i need the correctly ip and i would try it with standard ip.

And its not nessesary on which region the naomi jumpers from multi bios are or?
Click to expand...

You seem to have a few questions, and that's good! ...

Did you read TwistedSymphony excellent guide/thread about it? Most of these are already answered in there.
Also may I suggest chunksin marvelous wipi netbooter?
 
Take dimm apart check the two small pcbs
Are correctly connected together .
 
I check the connection between the two pcb often... With news screws its right connected.

I have a new secure key from ebay. But it is nessesary to get the network and dimm settings in the test menu?
 
Yes, it is necessary. The key won't change anything.
 
Can you put this secure keys wrong in the slot?

So you say, if no key is connected, i dont having network and dim settings?
 
Even without a key it should still show dimm board test in the system menu.
 
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