PC Engine Core Grafx II Problem, possibly power related

speedlolita · 09/22/2012, 06:24 PM

So I just went to play some R-Type and got no response from my PC Engine.

I typically use it through my RGB amplifier (transistors), and was playing about with capacitors (220uF) on the RGB lines (and composite sync) last night. After getting no image I've removed them and now I get nothing.

My EverDrive light doesn't blip on when accessing the MicroSD card so I assume I've broken something somehow.

I've also tried connecting it to my LCD TV via the regular composite cables.

I typically use it with an Atari Jaguar PSU which is rated 9V 1.2A - although my multimeter seems to think it's 12v which is a bit disturbing.

Any idea what's up?

Drakon · 09/22/2012, 06:41 PM

12v should be fine it's using a 7805 voltage regulator.

speedlolita · 09/22/2012, 06:46 PM

Okay, well that rules that out.

thesteve · 09/22/2012, 07:48 PM

you were messing with the amp setup, could have broken a wire or blown fuse.
check the 5V at the regulator or slot

speedlolita · 09/22/2012, 08:01 PM

The amp is external and I hook it up to the exterior I/O. A blown fuse seems like the most likely scenario in my head.

EDIT: Here's a picture of the fuse, am I right in assuming that replacing this would fix it? http://goput.it/4bt.jpg

I'll probably follow mmmonkey's SNES fuse replacing guide if so and make the fuse socketed.

BlueBMW · 09/23/2012, 12:18 AM

Looks blown to me. Check continuity between the fuse and ground before you put a new one in and make sure theres not a short somewhere.

speedlolita · 09/23/2012, 12:39 AM

Shame I don't have a multimeter with a continuity test built in, imagine that.

I shall be purchasing a new multimeter and various other tools come payday I think.

Also, this may not be the thread to ask in, but is desoldering braid a good idea if I want to install an 8 pin DIN socket? I've not had much like with my desoldering tool.

BlueBMW · 09/23/2012, 01:15 AM

I love desoldering braid myself. Though I recommend you use it with some liquid flux for the best results.

speedlolita · 09/23/2012, 01:17 AM

Awesome.

thesteve · 09/23/2012, 01:30 AM

that is not just blown, its short circuit blown

speedlolita · 09/23/2012, 02:29 AM

What else needs replacing?

thesteve · 09/23/2012, 05:26 AM

if you know what blew it, just the fuse.
if its still a prob, it wont wait to tell you

speedlolita · 09/23/2012, 06:34 AM

Oh I see, silly me.

No as I say, no internal modification so it mostly likely won't short again. I think I plugged the RGB, 5v, gnd and composite video one pin over from usual. I imagine that did it.

speedlolita · 09/27/2012, 08:10 AM

Yep, put in a 1A axial fuse and all seems to be working now. Thanks guys.