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Naomi 2 + Netdimm Error 22

Foxe

Foxe

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So, I finally got a zero key and bios in the mail today. Threw them in my Naomi 2 with the whole netdimm set up and I get Error 22.

Bit of a history... The Net dimm that I got had one of the capacitors fallen off the main board. I replaced it with a similarly spec'd cap from digikey. Solder all seems fine but admittedly I'm not great at that stuff. Error 22 seems to be a connection issue between the Naomi and the Netdimm. The net dimm seems to power up fine and even has the indicator light for the ethernet port light up.

Memory tests on the Naomi 2 reports good across the board.

Is it really just a connection issue between the two or could there be something else going on? Net dimm should be in working order as is the Naomi 2, I had pictures from both sellers. Help please!

-Quick Edit-
Another issue was that the zero key I purchased came with bent pins. I pushed them back as best I could and it seemed fine. Could this be an issue?
 
Last edited:
Error 22 can be multiple things, here are the more likely ones in order:

1. The daughterboard isn't plugged in properly (check/clean all connectors as well)

2. The fairchild buffer chip is dead and needs to be replaced

3. The TSOP firmware is corrupt and needs to be reflashed

4. The main dimm board has some kind of timeout due to some other hw fault.
 
Check voltages on your system while it is powered, specifically the 3v3
 
Mrhide said:
Are you trying atomiswave games or naomis?
Click to expand...
I have both loaded on the SD card but I think Error 22 preludes any game loading. Pi can't connect to the net dimm yet.

rtw said:
Check voltages on your system while it is powered, specifically the 3v3
Click to expand...
I can give that a try but I'm not quite which spots to probe for. I'm using a pico psu with Mitsurugi's ATX cable. Would you happen to know what spots would be best to try?
mathieulh said:
Error 22 can be multiple things, here are the more likely ones in order:

1. The daughterboard isn't plugged in properly (check/clean all connectors as well)

2. The fairchild buffer chip is dead and needs to be replaced

3. The TSOP firmware is corrupt and needs to be reflashed

4. The main dimm board has some kind of timeout due to some other hw fault.
Click to expand...
I'll definitely go over cleaning it again.

I did have a question though, could a bad zero key cause this error? I bought mine off ebay and the pins came bent pretty bad. If anybody knows somebody from the forums here who can sell me one I would appreciate it.

Finally, a big thanks to each of you for trying to help. :)
 
Foxe said:
Mrhide said:
Are you trying atomiswave games or naomis?
Click to expand...
I have both loaded on the SD card but I think Error 22 preludes any game loading. Pi can't connect to the net dimm yet.
rtw said:
Check voltages on your system while it is powered, specifically the 3v3
Click to expand...
I can give that a try but I'm not quite which spots to probe for. I'm using a pico psu with Mitsurugi's ATX cable. Would you happen to know what spots would be best to try?
mathieulh said:
Error 22 can be multiple things, here are the more likely ones in order:

1. The daughterboard isn't plugged in properly (check/clean all connectors as well)

2. The fairchild buffer chip is dead and needs to be replaced

3. The TSOP firmware is corrupt and needs to be reflashed

4. The main dimm board has some kind of timeout due to some other hw fault.
Click to expand...
I'll definitely go over cleaning it again.
I did have a question though, could a bad zero key cause this error? I bought mine off ebay and the pins came bent pretty bad. If anybody knows somebody from the forums here who can sell me one I would appreciate it.

Finally, a big thanks to each of you for trying to help. :)
Click to expand...
A bad zero key will cause error 26 or error 31.
 
One more thing to check out is which version of BIOS are you using on your NAOMI ?

Here is the power pinout of the NAOMI.

JSTPinout.jpg
 
it's the MetalliC Multi Bios ("normal" multi) so he should be good to go. Just in case, I can always send him a spare or stock bios if it helps.
 
I had error 22 the other day and I de-cased the dimm (mother and daughter board) and it seemingly fixed the issue. Might want to try that as well.
 
yep, in general, error 22 means "DIMM's lower/main board can not communicate with some of upper/option board components", the cause might be bad connection (typically) or if some ICs at upper board was fried, or wrong JP settings.
 
It's alive!!!

http://imgur.com/gallery/SB5ilkc

The capacitor that I replaced wasn't making great contact so I gave it another go and replaced it again. Taking other advice, I connected the net dimm without its case after cleaning the contacts pretty thoroughly. Then, tada!!! Thank you everyone so much for your help.

The only issue now seems to be some pretty bad interference? Maybe a bad vga cable. Ill double check cleaning all of those ports + the capcom i/o.
 
Welp... back to error 22...

Countless cleans and drying layer, no luck.

Checked voltages off the pico psu, all good.

Chances the memory sticks aren't making good contact?

Could it be the capacitor at CE3 on the larger board that I had to replace?

Are there possibly new connectors I can solder in?
 
I just tested every solder point from the connectors between the two netdimm boards. They make perfect contact. Solder side of one board to solder side of the other. There is no issue between those two boards. Personally, I think the problem lies in the Naomi unit itself. I was able to get past Error 22 just once out of maybe 20 power cycles without removing the net dimm at all.

I guess I'll test continuity solder side between the Naomi motherboard and the larger of the two net dimm boards to make sure they're actually making proper contact.
 
Foxe said:
I just tested every solder point from the connectors between the two netdimm boards. They make perfect contact. Solder side of one board to solder side of the other. There is no issue between those two boards. Personally, I think the problem lies in the Naomi unit itself. I was able to get past Error 22 just once out of maybe 20 power cycles without removing the net dimm at all.

I guess I'll test continuity solder side between the Naomi motherboard and the larger of the two net dimm boards to make sure they're actually making proper contact.
Click to expand...
Don't bother testing further, that's 100% a dying buffer chip. You need to replace the fairchild buffer chip on your DIMM board (IC12S).
 
worth to try.

but it is not 100% buffer IC, few weeks ago one guy @ twitter was trying to repair ERR22 and buffer replacement didn't solved the problem, it looked like something else is fried at main/lower board.

PS: I'm expecting even more similar topics in near future, as I see number of cheap DIMMs with ERR22 for sale at ebay :)
 
Good suggestion. Is there any way to test if the buffer is bad or should I just replace it any way? Also, I'm curious how do you know this could be related to the buffer chip?

Would you know somebody on the forums who sells replacement parts for this? If it's not the buffer chip, where would I look next?
 
Before starting to change buffers please tell us if your NAOMI2 works with a normal cart.
 
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