Is it doing this with the GD Rom disconnected also?
You may have blown a buffer. BTW a failed GD Rom drive can fry your DIMM too.
You may have blown a buffer. BTW a failed GD Rom drive can fry your DIMM too.
I would take it as gospel. I get Error 22 on two of my DIMM boards, both boards were in cabs that had +5V voltage over 5.15. After adjusting voltages on all my cabs to slightly over 5V I haven't had any subsequent issues with DIMM boards. Check your voltages and grab another DIMM.Well I thought I'd jump in here. I have repaired thousands of DIMM assys and re the error 22, there are 3 reasons for this aside from the Media bd not being seated correctly. Most common cause is yes, the Fairchild 16245 buffer on "solderside" of pcb. All Fairchild buffers used on Sega platforms from Naomi thru Hikaru will fail eventually if they haven't already. Simple fix. Next would be the firmware at IC14/36 (FLASH ROM not EEROM) getting corrupted or just bad. Also simple fix. Next but much less common is the BGA at IC2 turning into a charcoal due to a shorted GDROM Drive. I have repaired around 200 of these where Drive shorted so bad, it fed back thru SCSI port and cooked this IC along with damaging FLASH and buffer. Somewhat simple fix.
I'm not sure what you are asking, but maybe someone else who knows more will chime in.question on these buffer chips will M74LCX16245DTR2GOSDKR-ND work as a replacement
Swoop up the cap kit for the Sun PSU while you are at it: https://iankellogg.com/sun-power-supply-cap-kit.html.I'm not sure what you are asking, but maybe someone else who knows more will chime in.
To update this thread and bring everyone up to speed: After installing a new cap kit and flyback, and adjusting the voltage on my power supply the arcade is working better than ever!
I'm still getting error 21 on startup, but usually only one or two times before it works. I need to buy/borrow a good multimeter since the cheap harbor freight one I have isn't cutting it.
Next order of business is some repair work to a couple of the edges, and installation of new T-molding, and some fresh paint in a few places to finish up the job!
Thanks again for everyone's help and advice!
Yes they will. Don't get your hopes up too high though, replacing the buffer has only fixed one DIMM I tried it on even though it is one of the top three failures on the DIMMS.question on these buffer chips will M74LCX16245DTR2GOSDKR-ND work as a replacement
What I've read is these buffers will all fail eventually from some guy who has repaired 200+ I don't know how accurate that is.Yes they will. Don't get your hopes up too high though, replacing the buffer has only fixed one DIMM I tried it on even though it is one of the top three failures on the DIMMS.question on these buffer chips will M74LCX16245DTR2GOSDKR-ND work as a replacement
So basically what you are saying is the chances of this fix working are pretty dimm...Yes they will. Don't get your hopes up too high though, replacing the buffer has only fixed one DIMM I tried it on even though it is one of the top three failures on the DIMMS.question on these buffer chips will M74LCX16245DTR2GOSDKR-ND work as a replacement
I just finished installing the sun power cap kit, and man was that difficult! I used the same solder sucker that I used on the monitor PCB but it was not working at all. The copper traces are so close together that I had a really difficult time not bridging the connections. Some of the solder pads were even lifting off the board! What a pain!Swoop up the cap kit for the Sun PSU while you are at it: https://iankellogg.com/sun-power-supply-cap-kit.html.
Let us know if that resolved intermittent ERROR 21 issues as well."
Because then you can use any fan you want? I use Sunon MagLev ones pretty much exclusively for everything. I just get the right size and resolder the old leads. It takes like two minutes.Why would I do that when I could just buy the fan with the right connector?