First cap kit/fuse question

[Jedidentist]

Hey guys,
Posting this from a restaurant and hoping I can get a response before I head back home. Did my first cap kit today to try to fix a wave in my Nanao 20" (Sega Turbo). When I hooked it back up...no go. No neck glow, no smoke, no nothing. No spark while discharging. After removing it, I noted that my 125V 800mAmp fuse was blown/broken. I don't know if it happened while I discharged it before the cap kit or while I was soldering or what. What I wanted to know before I head home is do you think I'd be safe trying a 250V 750mAmp fuse? That's all they have at Radio Shack and wouldn't be able to even find a 125V 800mAmp until monday and I wanted to do some troubleshooting. I would think that nothing higher than 125V would be running anyway (because that's what's coming out of the wall) and if something higher than 750mAmp tries to go through, it'll just blow it early? So the only risk I would have is the fuse blowing early? Thanks!

Derek

BTW-I triple checked all of the polarities of my caps before powering up. Had a little bit of a tough time on a few soldering points, but everything was good and solid before powering up.

 

[modessitt]

The voltage doesn't matter as long as it's equal or higher. The amps are important, but going SMALLER won't cause a blowup on the chassis that isn't already there. The problem will be if the fuse blows again, you won't know if it's because you still have a problem or because it isn't rated high enough for the circuit...

 

[Jedidentist]

The voltage doesn't matter as long as it's equal or higher. The amps are important, but going SMALLER won't cause a blowup on the chassis that isn't already there. The problem will be if the fuse blows again, you won't know if it's because you still have a problem or because it isn't rated high enough for the circuit...

Thanks for the speedy response. That's what I figured. I thought that 50mAmps difference might not be that much of a difference. If it works, awesome...if it blows again, then I'm out $3 for the fuses...not a big deal. Thanks!

 

[Jedidentist]

Crap. Well, the fuse worked fine...didn't blow. However, it didn't fix the problem. Now I get a quick, faint rainbow "bloom" that fades with time. I don't feel static on the tube, and don't really see a neck glow. Any thoughts or trouble-shooting ideas? I remember I had a junky transistor on my 720 and just replacing that fixed it. Could I have blown that somehow when I blew the fuse...likely while discharging it? It all worked fine prior to me doing anything with the cap kit. And now that I think of it, I actually discharged the monitor previously and re-attached it and it was fine...so I don't think it was my "discharging technique" and probably the transistor is fine. Thank everyone.

 

[modessitt]

Go over all of your caps/work again...

 

[Jedidentist]

Yeah...that's what I'm gonna do tomorrow. Already into The Glenlivet now, so best to wait until tomorrow.

 

[Jedidentist]

Well...reflowed solder on everything and touched up a few areas that looked suspicious. This time, I got about 10 seconds of a black and white screen with vertical lines that seemed a little wavy...then it turned into the fading rainbow and disappeared like before. I'm not sure what else to do now. Maybe I heated up a few of the caps while I was soldering? Maybe the board heated too much? There are certainly a few areas of melted gunk around where I soldered. Probably a combination of the green covering of the board and some gunk that was left over from the original soldering. Oh...and the fuse is still good...that didn't blow. So...I sent an e-mail off to Chad to see if he'll give it a go. Unless someone else wants to have a go at it???