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| Tony_G:
BTW Did you check the ground connection for A10? You should probably check for A14 as well when you find those feedthrough capacitors. TonyG |
| jrharley:
Hey Tony_G, you're right. Once I cracked it open again and took a closer look, it became clear where A14 was. I was indeed pointing to A13, my bad. Now I'm working out the best way to get access to the A14 board assembly. It's mounted through a copper shield that is attached to the back of the compartment. Some disassembly is in order here. This could take some doing, those caps are new to me as a form, so I'm being a bit cautious in the tear down. It almost seems like they are a modern version of a "gimmick capacitor" that one can sometimes encounter in really old gear. Hard to see how they could fail, but hey, leave no stone unturned! I think with hemostats and some long tweezers, I can extract this thing, but we'll see. I'll look at all ground points for sure. I think A10's ground is via screws to the frame per the schematic notes, and I've periodically checked ground continuity when testing, but I'll keep it top of mind as I go about things. The ground wire under the screw that holds the A14 board and shield assembly looks real solid. Don't think anyone's ever removed it. Thanks for the feedback! JRH |
| Tony_G:
It might be easier for you to just use the ends of the jumpers/wiring harness rather than try to extract the board/assembly. TonyG |
| jrharley:
Too late! I'm in like Flynn! Couldn't resist. Since I've got no idea what I'm doing really, I have to learn by examination. I hear what you're saying about the testing points, but I gotta' say, that access to the contacts was not great while assembled, and removing the connectors in place looked risky too. I decided I'm going to air this corner out a bit, clean things up, and educate myself about it. It seems to make sense to take a fair amount of time just seeing what I can see with this part of the circuit and improving things where I can. No other fool should ever be compelled to come back in here! I may end up pulling board A14 out completely, for a closer examination. I've never seen a set up like this. The caps are "invisible". Very curious to me. See the attached photo for a view inside the A14/A12 area. Thanks Tony_ G! JRH |
| Tony_G:
Would be interested in seeing photos from various angles of the A14 board if you do remove it. TonyG |
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