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TT030 C302406-001 REV H

Posted: Sat Jul 21, 2018 5:15 am
by Steve
It has a very strange multi-layered modification on the sound chip people haven't seen before. Does anyone know what that was for? Thx.

edit: updated the title to rev H as suggested by Atarian Computing.
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^ Oddly on the top of the motherboard in the bottom right hand corner where it says REV_____ it has a very faint hand stamped 'B'. I don't know why that doesn't correspond with the PCB revision on the underside pictured above.

Re: TT030 C302406-001 REV A

Posted: Sat Jul 21, 2018 5:56 am
by Atarian Computing
Nice pictures! TT revisions are a mess. Your's probably is a REV.H. I've seen many C302406-001 REV A boards with REV.H topside.

Re: TT030 C302406-001 REV H

Posted: Sat Jul 21, 2018 9:03 am
by exxos
Interesting.. Pins all bent on the IO ports on the YM chip.. Wire goes to "DD enable" to the 1772 by the looks of it. I will take a guess its a factory fix ? Maybe you could take out the YM chip and see if there is any tracks visible ?

Re: TT030 C302406-001 REV H

Posted: Sat Jul 21, 2018 10:35 am
by Atarian Computing
I'm certain that there are two revisions of REV.H. Let me show ya:

Here is the earlier revision from this forum:
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InkedTTha_LI.jpg
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InkedTThc_LI.jpg
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And another early H.
IMG_0030.JPG
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Here is proof that C302406-001 REV A boards can be REV.H
Atari_TT_Rev____unten_rechts.jpg
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Atari_TT_Rev_H_unten_links.jpg
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Notice how the bottom left corner is green instead of metallic?


Let's look at another newer REV.H:
DSCF1294_s.jpg
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InkedTThf_LI.jpg
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InkedTThe_LI.jpg
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InkedTThd_LI.jpg
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Now compare these pictures to yours.

So my conclusion so far is that if you were to turn the earlier REV.H around it would probably read C301763-001 REV D. I've never even seen a picture of a TT board with REV.D on the topside.

Re: TT030 C302406-001 REV H

Posted: Sat Jul 21, 2018 11:35 am
by Steve
Very interesting. And yet none of them have that Yamaha chip mod. I would take it apart but it's kind of complicated, as it has got a PCB layer underneath it with an IC or two underneath.