Products > Test Equipment
Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
walter.aranda:
I find a compatible display (320x240) 4.7inch
walter.aranda:
check this ebay's photo about a firmware update card (TEKTRONIX 671-1701-01 ) , the connector is very similar to the one used in TEK THS7XXX series:
TERRA Operative:
My turn to crack one of these things open.
I just got myself a THS720 STD with soft case and power supply for a bit under US$80.
It has the common burnt LCD polarizer (Not sure if I'll play with sourcing the correct polarizer to suit the STN/FSTN LCD or just throw a whole new LCD in, I'm not a fan of the yellowish on blue that you get with using standard polarizing filters..) and it also needs batteries so I'll be fixing this one up all good and proper.
So far, I have found a possible replacement for the DMM input jacks, they are marked as Mueller 3160X, and the closest I've found so far is the BU-31602-0 (Black) and BU-31602-2 (Red)
They aren't exactly the same as the pin is straight on the Mueller part, but the Tek part has a groove cut to help retain the clips on the jumper wires.
Testing will tell if friction is enough or if a dab of solder or a quick turn in a lathe to cut a groove is needed.
I'll leave that up to someone else to explore as my DMM jacks appear to be fine.
As for the BNC jacks (mine are useable but have a few chunks taken out) I am thinking of cutting the existing ones away and installing something like these from ebay.
[EDIT] Actually, even better... Part number 67.9766-21 (but it's for RG58 cable) or 67.9764-21 from Staubli look realllly good and aren't too expensive from RS Components..
I am planning to convert the top cap for the battery compartment into a battery contact using some tinned copper braid (leaving the side contact in place inside the scope) and use a set of 4000mAH GP brand Ni-MH C size batteries.
I just need to figure out the best way to reattach the metal piece to the plastic cap, as mine has also broken as usual, and solder to the stainless steel metal piece. I'm thinking either some silver braze, or copper plating then solder.
Then it's a firmware upgrade, recalibration and experimenting to see if it can be upgraded to a THS720P
TERRA Operative:
Ok, I have reason to believe that the original designers had the idea to allow the use of standard C-size batteries, or at least a stick of batteries in a pack without that side ring arrangement, but it was scrapped for whatever reason...
I was thinking it was a bit odd that the metal piece was part of the battery cap when a plain plastic part would have been cheaper to produce and would work fine, unless there was a last minute design change...
Take a look at the attached image.. See the strange shape moulded into the top edge of the hole the battery passes through? I would bet money that a small metal contact was intended to go there so when the lid was installed, the metal part would contact both the top of the battery (or top cell) and the (missing) contact and allow for the use of standard cells.
I think it would be trivial to bend up a little bit of metal from some nickel or similar to clip in there and give the scope the option for either battery use case.
TERRA Operative:
And here's the clip installed.
Just cut out of a sheet of 0.35mm thick nickel and bent with small pliers and finally filed to an interference fit.
The +ve lead will be extended from the existing side contact and soldered to the tab there.
All going well, when the lid is installed the metal part will make contact with the clip and the battery to complete the circuit.
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