Products > Test Equipment
Fool for the 8656A Sig Gen
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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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