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 Post subject: [CLD-1070] AC3 Mod  Topic is solved
PostPosted: 07 Apr 2022, 16:48 
Honest fan
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Hey all, I'm trying to figure out the RF tap point for a CLD-1070 to install an AC-3 board. Full disclosure, I'm selling these boards for $35. I do not plan on hoarding this information once I find it. I'm trying to gather a database of sorts with images of the RF tap point on various players (+5V, -5V and GND, too).

I've attached some images here to show what I found via the Service Manual for a 1070.

Image
Page 27 of the Service Manual

Image
Page 39 of the Service Manual

Image
Image of the board I'm using

Thanks!
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 Post subject: Re: AC3 Mod - CLD-1070
PostPosted: 10 Apr 2022, 01:02 
Shows curiousity
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Hey Patrick!

I'm curious if someone can use an oscilloscope to confirm rf tap points?
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 Post subject: Re: AC3 Mod - CLD-1070
PostPosted: 10 Apr 2022, 03:07 
Hardcore fan
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The middle leg of Q351 is where I tapped my RF point on my CLD-M90 and it works great.

I don’t think there is really an exactly correct place to tap the RF so it can possibly work where you have it (only way to find out is to try it). In any case, the RF tap is somewhere just before the band pass filter of the CX chip which is exactly where you have it.

As for using an oscilloscope to find a tap point, I don’t think it’s necessary. So long as you know the general location you need to go, just see what happens. Worst case it doesn’t work and you just move on to another nearby point and try again.
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 Post subject: Re: AC3 Mod - CLD-1070
PostPosted: 10 Apr 2022, 19:23 
Absolute fan
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ldfan wrote:
In any case, the RF tap is somewhere just before the band pass filter

Yep - in Pioneer-land, you are looking for the two transistors just before the BPF. Some models even keep the same numbering: Q352.

No need to scope it, but if you really want to: http://www.laaudiofile.com/ac3mod.html
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 Post subject: Re: AC3 Mod - CLD-1070
PostPosted: 11 Apr 2022, 05:17 
Honest fan
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Thanks ldfan! I would've just PM'd you, but I wanted to put it out here. I want to get through and document as many players as I can. Will wait to get my hands on one of these in the near future.
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