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Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found

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TERRA Operative:
And finally, it's all assembled.
A little tweaking is needed to ensure a firm contact between the battery door and the clip, but it works quite well.

For the battery door repair, I used a little bit of a pencil eraser carved to fit where the retainer strap locates and then held it in place as I filled the rest of the cavity with JBWeld.
Once it had hardened, I cut the eraser out and then filed the JBWeld flat. Be careful of the locating pin for the retainer strap! It sits higher than the edge of the cap so you have to file around it rather than just filing or sanding over the whole face at once.
I then drilled and tapped (not too deep!) four M2 holes where the broken pins were and drilled and countersunk the holes in the stainless steel plate (You can probably do a better countersinking job than me...).
Four M2 x 4mm countersunk screws and some superglue as threadlocker had it all assembled as solid as can be.

Reassemble the case and now you can use standard C-size cells in your THS700!  8)

shakalnokturn:
I came to the same conclusions on the top cap:

https://www.eevblog.com/forum/testgear/tektronix-ths-7xx-battery-mods/

A couple of things that may not be obvious on the photos, there isn't quite enough length for standard cells, I cut away some of the scope's plastic under the negative contact spring, it was still a quite tight fit for the positive cap / lock so to not ruin the plastic I slightly bent and filed the edge that engages into the plastic so that it would enter without risk of wearing the edges.

TERRA Operative:
Huh, we both did almost exactly the same thing, right down to the shape of the clip. :D

I didn't carve any plastic from the end yet as I didn't have a standard battery to compare to.

1audio:
The pre-A version is more than a little different and the firmware to add the -p option may be not possible. The pre A does not have the ability to use the meter input as a trigger source. There may be other hardware level things that could bite.
The BNC's they used had a clever connection that is reminiscent of an F connector using the center conductor directly into the female socket. The outside of the BNC is insulated so they meet the safety standards. But the #$#&^% pins all break off so the connections are loose. . .
I converted to LED backlight which makes an enormous difference in utility. The hard part is power for the LED's The power on the connector swings a lot.

TERRA Operative:
Well, I just bought a THS720P for equal to about US$120, working screen, no accessories.

I might take a couple high resolution photos of the PCB's of both the THS720STD and THS720P and compare them to see if there's any obvious differences.

I've been eyeing this backlight mod, might make a PCB order soon...
https://www.eevblog.com/forum/testgear/tektronix-ths7xxx-scope-ccfl-controller-drop-in-replacement-for-led-conversion/msg4775420/#msg4775420

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