Sega CD Model 1-Replaced fuse still not workn ?

[demonseed]

Hey
Just an update I got it fixed thanks for all your help!!! I will leave the post incase others need help.. thanks guys!

Hey Guys
I got a sega cd model 1, tried it, dead.. I checked the fuse that is common to die and it was dead. I wired in a new one and confirmed with my multimeter that it works. When I try to power it, nothing. Once it flashed on (the red and green lights on front).

I put in a 2.5 amp fuse (same as what was in there). I wired it with small wires and into a fuse holder. I have checked the fuse and the new one is not getting fried. I took the multimetere to the new ones and it says it works.

Any suggestions? Do you think the wires are too small? fuse too small? I have heard some say that you have to up the ampage? Any suggestions? I attached a photo...I am wondering if the smaller wires are too small? the wire I used was from a battery powered christmas village light set says on it 1.5 volts x 2.... If it is the wire what size gauge should be used? I am not an electrical expert...... but would really appreciate some advice.

thanks
Jim

[nathanallan]

I don't think, based on your pictures, that they are making good contact. The wires are not too thin, else they would have cooked very quickly. They must be soldered in to make good contact. Also, make sure the power supply is putting out enough current for the console.

But it definitely needs to be soldered in else that full amperage of 1.2A will not make it through.

[demonseed]

Hello
Ok so I will get some more solder on the spots. I am newbie with multimeter how do I check power supply is outputting enough and what should it read on multimeter?
thanks
Jim

[nathanallan]

For voltage, set it to volts less than 20VDC, depending on your meter. Red is positive, in your case the OUTSIDE of the barrel connector, NEGATIVE is on the inside of it. Just the plug by itself ought to read something like 12 or so volts. If it is a tad bit higher that's okay, but you don't want it too low.

Amperage comes later, but try that first. Amperage is a bit more involved.

[cheaterdragon1]

I thought the model 1's used 1.5amps and the model 2's use 2.5amps.

[demonseed]

OK
I tested the power adapter and I get 12 V, 12.8 v.......

I added some solder and it looks more secure.

I did a contiunity test with the solder points and they seem ok but the prob on either side and it beeps.

I did notice it does flash when I turn it on (sometimes) the lights on the front, but not often at all.

I checked the fuse it is not blowing since changing.

The fuse that came out was 2.5 amp... is this wrong?


Any other suggestions? I greatly appreciate your help!

*** OK I just noticed something*** Also I should note I am using a NES power adapter to the GENESIS and the proper one for the sega cd. I tried switching them for fun and when I put NES adapter to Sega cd it blew the fuse. WHEN the NES one is in the GENESIS the red light turns on but game does not work? could this be the issue? Does the genesis send signals to sega cd??? do they work together some how? Damn it.. need to find an adapter that is proper.. I have a SNES and N64 would they work? I have found multi's on ebay like this http://stores.channeladvisor.com/pnp...0NES%20Genesis

But I hate to spend the money and it does not work.... anyone have one kicking around any suggestions?? I don't want to spend much.. I hope the sega cd is not dead thanks to trying the nes plug with it.. good news i only tried it once and no lights.. so maybe its ok.. the genesis is fine.. but the nes one does not work with it. Is there a way to check if the sega cd is now dead? I am hoping the fuse blowing prevented damage... I guess I need a 1602 adpater....sucks paying $25 for one! and it may be dead..err i mad!

thanks
Jim

[nathanallan]

First of all, the NES adapter outputs AC and that will not work, and you are lucky you are getting anything to work with it, even a blink. It WILL fry the Segas. Don't use them on Segas.

Don't use a NES power supply on a Sega, ever.

Here is an idea for you, one I made happen. You seem to be up to this one.

Get a 10VDC power supply from a laptop, one with an amperage rating of say, 3.x amps. Chop off both connectors to your game power supplies. Chop off the laptop plug, make note of positive and negative. Connect both of the game plugs in a "Y" split, also make sure that BOTH are tip negative (center negative).

This way you spend about $9 shipped on a Chinese laptop power supply that is switching and better quality than what you have, and it puts out a LOT more amps than needed, so it won't break a sweat powering two little consoles.

I found one from a Canon printer that worked. Stay under about 15 volts and over 2A and it will work.

[demonseed]

Hey
Thanks for the idea, however I think to be safe I will look for the sega one..just to make things easy..... thanks for the idea.

thanks
Jim

[tenchibr]

Hi, I also have the same problem. To summarize, I have a perfectly working Genesis 1, High Definition Graphics, S-Video modded.

I have 2 AC adapters, both official by SEGA, both work on the Genesis perfectly.

Now, the SEGA CD. I did the fuse fix with a fuse holder, and I can use the SEGA CD to bypass stereo audio. In case you didn't know, the SEGA CD won't bypass audio without an AC adapter. So I don't think power is the issue here.

I get both green and red lights to blink once, from a cold boot. Switching on and off back and forth doesn't get them to blink anymore. But unplugging the AC adapters, both for 5 seconds, and replugging and turning it on always shows the lights. But no BIOS.

I can hear the CD tray mechanisms working, so the SEGA CD is somewhat alive. But I have no clue why it won't load the BIOS.

[demonseed]

Hey
Hmmm.. sounds similar to mine.. I have a replacement ac pack on the way so I shall see what happens...

Jim

[tenchibr]

Ok ok, good news and bad news:

Good news: I went to Walmart, bought alcohol + Q-Tips to clean up the connections. I opened most of SEGA CD and I didn't know, but the piece that you attach the Genesis to the SEGA CD is also attached to the SEGA CD the same way. You can remove it and clean both connections and the SEGA CD cart-style connection too.

I did something else too: I tested opening the tray manually, and I found that the CD tray was stuck because the center piece that holds the CD (as well as the lens area) was (is) higher than it should be so when the tray tries to open, it doesn't lower for it to come out. I forced it out (although that sounds more damaging than it actually was, I simply tried lightly pushing the spinner down while lightly pulling the tray up as I pulled it out).

That solved it! I can turn it on now, so that might help you demonseed.

On the other hand...

Bad news is, the CD tray won't close. And I'm pretty sure it has to do with the spinner not lowering, I need help lowering it please.

Edit: Ok, I decided to try something: I closed the CD tray back, and put Sonic CD in (of course, all done by opening the system not through the BIOS). And what I got was "Insert Disc in the tray and Press Start".

Does that mean that the system is not recognizing the game, or not recognizing the tray as closed? How do I fix that?

[demonseed]

Hmmmmm...
I can not do anything until I get my new adapter... however I appreciate your post! keep me updated.

[nathanallan]

tenchibr and demonseed, this rings a bell, and someone fixed their CD's by using a zip tie to hold the parts in the right places and it worked great. For the life of me I cannot find a link to that story.

Check the position of the CD tray and mech, it might just be screwed down too much or not enough. Nice catch on the CD tray, BTW.

[demonseed]

Hey
I finally received the proper power plug for the sega cd, and to my surprise it works flawlessly! I was worried it was dead, (due to bad seller) or due to me using a nes power pak! it works I can't believe it..... must have been the fuse and or power cable... thanks for all the help! now I need to stock up on sega cd games!

[akaviolence]

Make sure the tray belt isn't too loose, it wont move the tray in/out and laser up/dwn if it can't produce enough friction. Of the 8 or 10 i've fixed almost all the sony tray units needed a new belt, I used a rubber band that was smaller than the original belt, works like a charm. To move the lense up and down rotate the large gear just ahead of the spindle. With the lense down all the way you can move the tray all the way out then remove the belt cover and change it out. I think there is a youtube vid of someone explaining the timing and tray removal etc.