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.
The preamplifier boards in the 1292 (CAR, CAG, CAB for each colour respectively) are fully discretely built as far as the video path is concerned each board having several hundred components on it. I always wondered how could they retain the high bandwidth on it, now I know how... LOL
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.
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?
I've never had a Sony projector actually, but over the years I got some spare boards for them, I have exactly 3 boards for sony 12xx? I never bothered to find out what these boards were as I don't find sony's board naming practice very self explaining. Anyway I took a look what I have, and one of my board is a B board, so I also have a set of those BX6473 hybrids to play with. Maybe I can try to grind off the potting?
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.
Now I would take these measurements with a grain of salt, because all of the on:off patterns go below ground! In this way it is way overpeaked, we don't know if it is really the signal or improper impedances fooling us, this is where the conventional 10:1 passive probes give up. Consider its 10-14pF tip capacitance forms an input impedance around 100 Ohm (which shunts the 10 MOhm) at 100MHz, plus if you use some crocodile style ground clip, it also adds several nH for ground impedance and there you have a nasty resonant circuit which you attach to the 75 Ohm system.
BTW I could reveal bits of the BX-6473 so far, it looks like it mostly consist of 2SC3839K transistors which in itself isn’t bad at all. A chemist colleague will try to remove the epoxy in a more effective way than using hot air+sharp knife...
Don't really care at this stage if the reading is correct or not. I look at the output from the moome as a reference and then look for bottle necks along the very long video chain. Once I get what I can better I will worry about the peaking. With the changes I have made so far the picture is looking much better, cleaner and brighter. I will get some screen shots later in the week.
That's OK, but based on the previous scope shots you can't assume much not even for comparison, because I'm 99% sure what you measured there has little connection to the actual signal. Also I don't question that you could even improve the signal chain without using an oscilloscope. But once you use the scope be aware of the constraints of your equipment so you won't be missleaded.
I went a long way with such measurements myself as well and talk from personal experience, so take it as a friendly advice.
I have here 250MHz-300MHz 10:1 passive probes as well, but they introduce a lot of ringing to the intermediate stages of these video circuits, and when the ringing introduced by the head becomes larger than the actual signal then you can scratch your head, if the scope is actually helping or not.
zjjxhzf: hello Gabor i am DLP projectorColor wheel is not accurate，setup memory， the phase angle cant setting for the color wheel ，must use service code.
Sept 19, 2017 1:31:25 GMT -5
mastertech: Hi stranger. Guess you spent your summer cruising on that street bike.
Sept 17, 2017 21:43:54 GMT -5
nashou: Hey everyone, just saying hi ! Hvent been here for a while hope you're all doing well !!
Sept 17, 2017 19:19:25 GMT -5
mastertech: Parts for repair are no longer available.
Sept 11, 2017 19:42:24 GMT -5
mayavi: my pioneer elite VSX-92TXH it freezes until I unplug and then it won't power on until maybe 10 minutes. came to know that its a common problem in this model. any help would be much appreciated......
Sept 11, 2017 13:39:10 GMT -5
jaredjaric: Thanks so much Hulio :), your expertise is very much respected
Aug 20, 2017 9:25:37 GMT -5
Admin: james: you need to post in the thread where your problem is being discussed.
Aug 9, 2017 19:51:54 GMT -5
james: Yes Sir All wiring was connected.
Aug 9, 2017 7:46:15 GMT -5
Admin: I have uploaded a copy of the SM to the digital projector section.
Jan 10, 2017 20:21:56 GMT -5
ducki: sorrry for my bad english ....(google translate
Jan 10, 2017 17:44:21 GMT -5
ducki: I have the same defect as a cp-x4021n you but can not start it ... I did the same trials with ic202 pc102 and still do not like, I make short pin 1 and 2 of the pc102 and PJ light (orange) goes off ... you can help me with a service manual for this PJ? TNX
Jan 10, 2017 17:43:46 GMT -5
jlb12: pwr switch off = 2(0.0) 3(11.7) 6(.04) 7(.04)
Dec 13, 2016 23:27:03 GMT -5
jlb12: No Problem. Thank you for all your help.
Dec 13, 2016 0:20:40 GMT -5