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Could this be mechanical in nature, i.e. that the internal geometry is tilted or broken? It would make sense as the issue seem bound to physical locations on the CRT display.
Thanks Brian.
The power rails (12V, -12V, 140V) is within 1% and less than 30mV p-p noise.
If i set the scope in X/Y mode and apply a 1Khz sinus to both channels i get this:
With this setup, the following is measured at the back of the tube:
X-plates:
Y-plates:
To my eyes the...
Hi all.
I'm repairing an old Kenwood CS-5130. The first problem was that the blanking circuit was broken, I found and replaced a dead diod. I also replaced associated caps that i suspected was the root cause, see image.
After i fixed the blanking circuit, i found another problem that...
Thanks for all responses!
I've ordered a better cam, expect delivery this week. Will post better images.
Again, thanks to all you wonderful people who spend time helping out!
Regards,
Mike
Hi,
I had a look at the solder balls under an fpga and wonder if the joints are likely to be good? It's lead-free process.
Any thoughts are most welcome!
Regards,
Mike
Thanks FvM,
the design rules are hardly used, not even length constraints are set up, except diff pairs that have 0.1mm tolerance. Obviously it's designed w/o xSignals...
I would certainly not have done it like this.
Thanks marce,
Yes, I compared with other DDR4 reference designs and this one looks nothing like them.
Designed in Altium.
Keep it or ditch it? :thinker:
I think it is in menu DXP | System | Navigation | Highlight Methods, where there's a slider ranging from "Far" to "Close".
Be aware though, if you set that too Far, DRC errors will not be visible when you select them in the list.
Hi,
I have taken over a partially completed DDR4 design. I'm somewhat suspicious regarding corners that is bent more than 90 degrees as seen in the picture. I'm aware that 90 degree corners should be fine below a few GHz.
Any thoughts on this?
Thanks E-design. I did and found nothing (as noted above). Could it be that the only flash/arcing that is going on is in fact the neon bulbs? When i looked again closely (dark room), i think i see arcing inside the neon bulbs at the very top of the rods.
Thanks again Brian,
- Checked C2008, C2002 capacitance (<±5%) and leakage (<1µA @30V), seem ok.
- R2010 within 1%.
- D2010 seem ok, Vf ~ 3.1V. D2011 not mounted.
- HV cap at the tube look good, the connector have no oxide or dark spots. Cleaned with IP and reseated. Thanks for the hair-dryer...
Ok, then pull out all the wires out of the air hose and check the cables for any issues, and locate where it's broken. Note that intact insulation on all 4 wires is vital for both safety and proper function. You can not replace the thermocouple wires with copper wire, you have to either replace...
Are you sure the break is in the welded junction? Check connectivity for each lead from the leads at the junction to the pcb. Note that the leads near the junction are heavily oxidized and might need cleaning before your dvm probes can make contact.
If it is in fact the welded junction that is...
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