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Date Posted: 09:20:14 01/28/02 Mon
Author: tequ
Subject: Re: AGC hack ?
In reply to: Jain 's message, "Re: AGC hack ?" on 05:23:20 01/28/02 Mon

Thanks,

I will try with your instructions and give feedback after fix.

-tequ


>>Hi,
>>
>>Can someone tell me how to make AGC fix when IF chip
>>is LA7575, should video signal to get out from pin 17
>>or 21.
>>Where should capacitor put and what are recomended
>>values for that.
>>
>>I have now taken the signal from pin 21. Tryed
>>capacitor to pin 10 with value of 47uF. The picture is
>>better but not good enough. I also have problem with
>>video muting (blue screen). I disabled on-screen unit
>>from video and the blue screen was gone, but screen
>>goes black quite easy. It could go black because of
>>AGC or there is still some muting function left, I
>>also cut video mute signal from IF card.
>>
>>here is link for datasheet
>>http://service.semic.sanyo.co.jp/semi/ds_pdf_e/LA7575.
>p
>>df
>>
>>Video is JVC, model I don't remember...
>>
>>
>>-tequ
>
>
>Last page of the link you provided has an aplication
>schematic. At pin 21 there is connected an emmiter
>follower. If your VCR has one, use the signal from the
>emmiter of that transistor, otherwise use the signal
>at pin 21. Put the filter capacitor at pin 3.
>Jain

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Replies:

  • Re: AGC hack ? -- tequ, 03:54:14 01/29/02 Tue
  • Re: AGC hack ? -- Jain, 05:05:09 01/29/02 Tue
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