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Date Posted: 08:51:14 04/06/02 Sat
Author: Max
Subject: AGC (sound) problems... one more correction...
In reply to: Max 's message, "AGC (sound) problems... continue..." on 08:48:38 04/06/02 Sat

>A have Canton3 board, and tried to use it with
>scart-loop cable, where AudioOut goes directly to
>AudioIn. On 14" philips TV it works perfect, picture
>is stable, no white and sound is clear (it has
>"decoder on/off" function in menu, and it takes video
>signal from scart when changing to chanell where this
>function is on). But i want do to see it on bigger TV
>:) There sound iz buzzing and disappeering on
>scrambled chanell. PIC locks up, and picture is about
>ok, but not so good, it has white zone and waving on
>top etc. Same thing with VCR, except that it mutes
>audio(which is buzzing) permanently after 5sec. As I
>undersood it's because of the IF chip. So I opened the
>VCR, found it (LA7555), and tried a 47uF cap to AGC
>filter1 and AGC filter2 pins. It doesn't chang
>ANYTHIG, I meen no changes in picture/sound at all. I
>also tried a 5K VR with cap in series with same
>result. And sound is still screwed before it mutes.
>So... Any comments, suggestions? Do I have to build a
>"5508W AGC fix", and if I do, is there a PIC 16c84a
>HEX for PAL with VCXO? Why the small TV works fine?
>Does it skip that AGC itself?

The PIC is 16F84A, not the C84a....
P.S. Sorry for bad english...

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