|
|
Post by caseh on Aug 12, 2015 1:11:04 GMT
I've just come away from testing a Model 1 Saturn for a few hours, all working fine until I decided to turn it off and pop another game in and power it back up. At this point an audible whine can be heard from the drive, along with severe rolling bars/interface as it attempts to read the disc and fails miserably.
If I leave it off for 5 to 10 minutes after it has a flap it's good to go, no issues. But if it's been on for say 45 minutes and I power cycle it then it has a tantrum.
Only conclusion I can draw is overheating. Any other ideas?
|
|
|
|
Post by caseh on Aug 12, 2015 1:47:57 GMT
Should add that if I reset it or pop the lid it's fine when it's been on for a while. So it only exhibits the fault when it's switched off and back on.
|
|
|
|
Post by zyrobs on Aug 12, 2015 1:53:21 GMT
You can either replace the TOP202YAI PWM switch on the power supply with a more modern TOP223YN, or add in an extra capacitor as marked on this image:  Or do both. I can confirm that adding a cap fixes it, and I've heard of people who changed the PWM switch and fixed the problem that way. I have not tried changing the PWM switch personally, I keep forgetting to order some when I need to get parts... |
|
NeoGeoNinja
Shadow Warrior
Joined: August 2011
Posts: 6,616
Location:
|
Post by NeoGeoNinja on Aug 12, 2015 4:35:52 GMT
I have this issue with my White JPN Model 2 if used for prolonged periods.
If I leave it to cool off (bit frustrating when on a gaming marathon!) and return, it works fine again.
Never had a 100% reliable Saturn yet tbh and have had plenty since 95-96 onwards...
|
|
|
|
Post by caseh on Aug 12, 2015 16:50:09 GMT
Muchos gracias chaps. Just ordered some capacitors and an uprated switch, have a spare model 1 so I've swapped the power boards over until they arrive. If the additional capacitor is the same physical size as the 2200 already on there I can't see it sitting well on that section of the pcb but I guess I will find out soon enough.  |
|
|
|
Post by zyrobs on Aug 12, 2015 17:39:13 GMT
If the additional capacitor is the same physical size as the 2200 already on there I can't see it sitting well on that section of the pcb but I guess I will find out soon enough. Yeah, it will look odd, you'll have to have it staying at an angle. But as long as you don't clip the caps legs early, that won't be a problem (I used a cap from a spare power supply which already had its legs cut, so it barely fit in there... works, though). |
|
