Technical and Repair Assistance

[simon2985]

Thank you for the reply  .

Does anyone know about the L7012CV CC04L V6 MAR 707 voltage regulator, if it is ok to use. I don't want to solder it in place only to cause damage to the system.

If they are of any use I do have some photograhps of the internals of the console on the internet now:

http://s593.photobucket.com/albums/tt12/Simon2985/

Thanks.

[133MHz]

I've never heard of such a regulator, and googling for datasheets doesn't turn up anything useful.
Personally I'm a little afraid that it outputs 12V instead of 5 (the last two digits in the 78xx and 79xx series regulators indicate the output voltage).

You can test it without installing it on your Famicom by applying a DC voltage between 7 and 15V DC between pins 1 & 2 (1 is the input, 2 is ground and 3 is the output) and checking with a multimeter if you're getting 5V between pins 2 and 3.

[simon2985]

I can only go by what is written on the face of the componant as I have very little electronic knowledge. I have a picture of the offending componant, I'm sorry but I couldn't get the writing any clearer.

http://i593.photobucket.com/albums/tt12/Simon2985/headlights0244.jpg

[133MHz]

That says L7812CV doesn't it? If so, it outputs 12V instead of 5V. Don't install it in your Famicom. Get a 7805.

[simon2985]

I think you are right, I have just come accross this:

http://www.rapidonline.com/Electronic-Components/Integrated-Circuits/Voltage-Regulators-linear/7805-7812-1A-Fixed-voltage-regulators/77611/kw/47-3313?source=googleps&utm_source=googleps

"A range of automatic, linear fixed voltage regulators that are designed to supply a constant regulated output voltage of either +5V DC or +12V DC."

It must have been an error on the stores computer system (a costly one at that if I had gone ahead and put the componant in the Famicom).

[simon2985]

Just as a quick question, would the voltage regulator I have linked to in my previous post be ok?

Thanks.

[133MHz]

Yes, only this one:
7805 REGULATOR TO-220 (TRU) RC    47-3313

[simon2985]

Thanks very much for your help, I will get a replacement 7805 regulator and see what happens from there. Fingers crossed it works.

[simon2985]

Sorry to be a pest with all my repeated questions, but I want to make sure everything is completly right before I go ahead. I have exchanged my voltage regulator for a 7805, but the code on it says:

L7805ACV

Does that mean it outputs AC instead of DC?

Thanks again.

[133MHz]

Does that mean it outputs AC instead of DC?

No, those are internal manufacturing codes. You can also find NE7805, LM7805, KA7805, etc and they're the same. The only important thing is that it says 7805. Now you're good to go .

[simon2985]

Great  , lets hope this gets it running.

I know this has been answered but the Mega Drive (Genesis) adapter is ok yea?

http://i593.photobucket.com/albums/tt12/Simon2985/DSC00738.jpg

Input: 240V AC @ 50Hz
Output: 10V DC 1.2A
+____C____-

A friend said that I may have fried the Famicom with it.

[133MHz]

Yes, the Genesis Model 1 adapter is OK.

[NintendoKing]

I could never get the Genny Model 1 adapter to fit properly.

[simon2985]

IT LIVES!!!!! 

Sorry about the caps, but i'm over joyed. I have no games as of yet for the system, but after soldering in the new piece I tried it on my Tv (using the Megadrive adapter) and I got a black screen. No tuning required.

I am gonna leave it now until I can get a game for it. But I just wanna say, you guys on this forum are awesome. This wouldn't have been possible without you guys. I cannot thank you enough. Next thing to do is try a game on it and see if it plays. 

[simon2985]

I have tried a game now. Golf. Plays perfect. Both controllers work, there is a small buzzing from the Tv but I think that is due to some interferance from somewhere (the Rf lead doesn't quite fit right), but it's not game destroying.

Next up, finding a Disk system.