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PostPosted: Thu Oct 16, 2008 1:27 am 
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Joined: Mon Oct 06, 2008 2:14 pm
Posts: 11
Hello everyone :)
First of all, I'm french so i hope you will understand everything.
I tried to add the composite signal to one of my Atari 2600.
It's a MODEL NO Cx-2600 AS, it's a PAL Model.

I used this wiring diagram:
Image

I couldn't find the exact components so i used these ones (all in Ohms):
390 for 370
120 for 130
1K for 1K
33 for 33
220 for 220
470 for 450
Transistor BC639 for 2N4401 (it has E,B,C inversion but I was carefull when soldering).

Here is my soldering diagram:
ImageImage

Because it's a PAL model, i couldn't use the spots marked on the pics. I used this spots on the TIA:
ImageImage
it's not the same pins as NTSC ones.

So, i wired all, and it's not working :/ Sound works well so it's the good chip (not the same label as ones of benheck pics).
When, i turn the VCS on, there is a tiny flash light on TV (so there must be some kind of signal but no images...
Do resistor values are important ? I thought that it would only alter colors or lights.

So, my poor VCS is on my desk, the case opened board soldered, waiting for revival.
Please, help me ^^


[EDIT]
Actually, after more tests, it seems that i have the image but with no sync, the screen is always going to top, and image is cut in alternate Z form (i hope you'll understand my explanations :/)
I used pin 2 for CSYNC.
Thanks for helping me :]


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PostPosted: Fri Oct 17, 2008 1:33 pm 
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Joined: Fri Jan 05, 2007 11:45 am
Posts: 464
Location: Turkey
As you are French(I suppose you live in France), shouldn't your system be SECAM rather than PAL?

Anyway, if you have the book check Atari MLL and solder a wire from "x" to "u"(pin2).

Let us know...


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PostPosted: Sat Oct 18, 2008 11:46 am 
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Joined: Mon Oct 06, 2008 2:14 pm
Posts: 11
Hello c_mon, and thanks for answerin gme.
As you said, it must be a SECAM model.
I don't understand which are this spots "x" and "u". As you told bout pin 2, i suppose that these are pin from TIA chip ?
pin 2 would be "u" ? so which could be the "x" point ?
I apologize if i'm boring you but with all these difference between NTSC and SECAM models, i'm a bit lost :/


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PostPosted: Sat Oct 18, 2008 2:26 pm 
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Location: Turkey
[img=http://img234.imageshack.us/img234/4070/atari2600palmllih1.th.jpg][img=http://img234.imageshack.us/images/thpix.gif]

This should help you...


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PostPosted: Mon Oct 20, 2008 1:01 am 
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Joined: Mon Oct 06, 2008 2:14 pm
Posts: 11
Hello
Once again I thank you for wasting some time with me :)
So, my VCS board is absolutely different from the picture you posted.
As i wrote above, spot u is pin 2, isn't it ?
But waht is the spot "x" ? I guess it must be a resistor ? But, because of the difference between board, i don't know which one...
Arrghhh, but why the hell we French do we have this SECAM curse ???


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PostPosted: Fri May 25, 2012 2:31 am 
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If you can send here the front and back pictures, it would help..

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I TAKE COMMISSIONS FOR CNC-ROUTED CASES AND PORTABLES... JUST P.M. ME!


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