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Post by gregstv on Jan 9, 2017 0:46:27 GMT -5
There is a lot of components in this video chain. I can see the input signal on all inputs to this chip even know I am only using port A. I have bypassed most of the relays and this has picked up the high end quite a bit. Still more to do. I might try running the ibf11 in port b and connecting the pre-amp board directly to it. I can do this by changing the coax connectors around. Just need to remove most of the back part of the projector to get to them. Hope they are long enough to reach the port b connectors.
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Post by gregstv on Jan 6, 2017 4:15:32 GMT -5
There is a drop through the BX6473. In the part id it says its a switch. Bypassing doesn't work so it must have more to it. Cant find any information for this part. Its on the BB board (signal processing) input and output below. Does anyone have any info on this part?
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Post by gregstv on Jan 5, 2017 14:38:46 GMT -5
I will do some checks. The top end is dropping before it gets to the pre-amp board. There is the be amp and RelaCRT Projectorsy for switching between inputs. It could be the coax used as well. I bet it droppes again on the pre-amp and probably on the neck board.
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Post by gregstv on Jan 5, 2017 2:10:29 GMT -5
There is a 500Mhz (BX6574)amp back before the signal goes to the pre-amp board. This is on the BB board. There seems to be a drop somewhere around this or the switching relays as well.
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Post by gregstv on Jan 4, 2017 6:31:32 GMT -5
Images using multiburst paten. Input to IFB 11 from MOOME EXT3. Output from IFB 11. Seems to be a bit of added high end. Input to video neck board. This drops off where the IFB 11 has stepped it up. Something in the video processing board between the IFB11 output and the neck board seems to be a bottle neck.
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Post by gregstv on Jan 3, 2017 14:46:52 GMT -5
Using a 100Mhz tektronics 10:1 probe. I have a 500Mhz 1:1 probe on order. CRO is a 100Mhz. I have done some measurements using the multiburst patten and will post them after work.
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Post by gregstv on Jan 2, 2017 18:21:49 GMT -5
I do run straight from the Cambridge to the moome on the main projector. The problem I am having with this setup is it drops the picture twice about 20 to 30 minutes in on every Blu-ray. It's some sort of handshake problem. It happened with the oppo as well.
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Post by gregstv on Jan 2, 2017 14:40:01 GMT -5
I will have a look with that pattern. I forgot to mention the DVDO supplys the pattern and the moome ext3 does the DA part. Should be able to see some roll off or change if there is a drop between in and out on the board.
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Post by gregstv on Jan 2, 2017 13:56:05 GMT -5
DVDO white screen green. I will do some measurements with the smpt pattern as well.
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Post by gregstv on Jan 2, 2017 1:40:35 GMT -5
I made up extension boards for the Barco and they work with the Sony IFB11. I took some measurements of the input and the output of the card with a full white screen. I cant see any roll off on the output.
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Post by gregstv on Jan 1, 2017 16:38:19 GMT -5
I wouldn't be surprised if a lot of the problem is the input card. These were made in the early days. They maybe designed for VGA and not much higher. The G70 and 90 have a totally redesigned input card.
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Post by gregstv on Jan 1, 2017 4:31:45 GMT -5
I need to work out the ASTIG to make sure it's not a part of the hold back. Being a metal chassis the ASTIG changes when you shut the lid. In the manual is says to fit a metal jig to match the lid on top of the coils while adjusting the CPC magnuts. I need to find my degausing wond and stat from there.
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Post by gregstv on Jan 1, 2017 3:02:43 GMT -5
Bandwidth is average by this picture. I will get some better pictures that are in sync and no yellow banding.I haven't noticed any streaking. I will have a better look.
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Post by gregstv on Jan 1, 2017 1:06:05 GMT -5
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Post by gregstv on Dec 30, 2016 15:11:16 GMT -5
Thanks Admin, It is a 75ohm switch. The moome is terminated at 75ohm, so with the switch on it would be less than 40ohms on the input of the projector. This was killing the picture. The last person to have the projector turned up all the gains to full to compensate for the switch being in the wrong position. It was that dull they would not of put up with it. Probably why it has low hours on it.
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