Re: Is it at all possible?

L4 is a common-mode choke, part of the RF filter network; not very critical. See:

http://www.digikey.com/products/en/filters/common-mode-chokes/839/page/24

Sounds like Santo's got everything covered but I've got a number of scrap 326298 boards in my piles of broken and working C64s if that can be of any help.

mike
  ----- Original Message ----- 
  From: Bo Herrmannsen 
  To: cbm-hackers@musoftware.de 
  Sent: Saturday, February 18, 2017 5:12 PM
  Subject: Re: Is it at all possible?


  my work so far are now public here: https://github.com/boelle/C64-Schematics-Boards/tree/master/From%20Programmer's%20Reference%20Guide


  the only unknow to me is L4 which is located in the very top right corner (inductor with red and green wire on it), but i guess a bit more deep searching should give me a value for it


  2017-02-18 20:39 GMT+01:00 Santo Nucifora <santo.nucifora@gmail.com>:

    I added head-on pics of the 326298 Rev A and C boards. Sadly, the back has a metal shield soldered onto both boards that will be difficult to remove and I'd like to keep these as working boards so front pics only.



    On Sat, Feb 18, 2017 at 2:31 PM, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:

      On 02/18/2017 08:15 PM, silverdr@wfmh.org.pl wrote:



          On 2017-02-18, at 09:36, smf <smf@null.net> wrote:

          "The sweet spot is a 250466 board


        Precisely…


          The VIC chip on those boards is a R5, which gives the clearest picture. "


      Not quite... You can get a clear picture from a 6569R1, 6569R3 or 6569R4 (that one is rather rare) as well. The problem on the older boards is mostly the modulator. Replace it with a simple video amp and you will have a very good picture. Ok, you lose the RF output, but who is using that anymore?



          It also has the 8 pin video port, not 5 pin like the earlier ones.


        Which is also not fully correct. Should read "like some of the earlier ones". Not all earlier boards had 5-pin A/V socket.


      Even the old KU board already has the 8pin Video out.

       Gerrit




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