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Post by gregstv on Feb 13, 2017 3:27:12 GMT -5
Hi Guys,
I have one of these 2505 sig gen;s with parts burnt up in the power supply. Does anyone have a circuit diagram?
Thanks, Greg
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Post by gregstv on Feb 12, 2017 20:45:39 GMT -5
There is a temp switch on the horn board. I have seen these crack. There is also one on the power supply sub board. When you turn the projector on the outside fans should start with around 6.8V on them. This voltage increases as the temp rises. Once it gets to around 8.2V the horz fan starts. This happens on the 909 and the 919.
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Post by gregstv on Feb 10, 2017 22:03:48 GMT -5
I will do some shots with all HFA100's changed to AD8009.
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Post by gregstv on Feb 10, 2017 22:00:59 GMT -5
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Post by gregstv on Feb 7, 2017 22:32:15 GMT -5
The AD8009 is a later chip using the later design technology.
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Post by gregstv on Feb 7, 2017 14:29:08 GMT -5
Greg do you get easily visible scanlines on your red and green at 1920x1080p 60Hz? Yes I can if I look into the lens. If I get close to the screen I can see them on a white picture but only just. My eyes are not the best.
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Post by gregstv on Feb 7, 2017 5:31:45 GMT -5
You probably noticed a big difference due to how bad your bandwidth was. I have to say my 919 is looking fantastic. Very sharp with great picture depth. Once I get the oscilloscope I will see what differance there is between the HFA1100 and the AD8009 amps hopefully. The AD has much better slew rate and a bit more bandwidth.
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Post by gregstv on Feb 6, 2017 22:22:00 GMT -5
I am playing with AD8009 OP amps in place of the HFA1100. Once I am happy with them I will send a set of boards to Casey to compare. These amps have much better slew rate and a bit more and width. I have purchased a Tektronics 2465a oscilloscope that will be here next week. Hopefully be able to compare the difference between the changes with this unit.
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Post by gregstv on Feb 6, 2017 18:43:34 GMT -5
Thanks Casey, I don't think bandwidth will be that much better. Maybe a little on the switcher. The aim was to reduce noise and give better depth.
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Post by gregstv on Jan 29, 2017 1:53:43 GMT -5
The caps in the power supply of the DVDO maybe on their way out.
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Post by gregstv on Jan 12, 2017 3:57:17 GMT -5
Dragged out the Tektronix TDS210. Input to CAG board Output from MOOME
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Post by gregstv on Jan 11, 2017 4:27:55 GMT -5
I have made an offer on a HP Agilent 54615B. The case is damaged but working well. He has not accepted my offer $300. What would be a fair price on this unit?
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Post by gregstv on Jan 11, 2017 1:44:50 GMT -5
gjaky, Can you post a picture of the multiburst pattern on your oscilloscope please?
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Post by gregstv on Jan 10, 2017 5:54:46 GMT -5
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.
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Post by gregstv on Jan 9, 2017 5:24:56 GMT -5
Output of the processor board is much better. looks like there is a drop over the coax to the pre-amp in. The pre-amp board is a part of the neck board assembly. Its like a stacked neck board. after coax on the pre-amp in before coax. output pin on the processor board
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