Electronics > Repair

Tektronix TCP202 current probe repair - Schematic and suggestions needed

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iso14000:
Hi all, I'm not very active on this forum, far much on a french one, but global level forbid me to post my request on it.

sorry to rise up this topic (and my bad english)

I've just bough a used TCP202 as defective on 3bay for a buntch of euro, and indeed it is in failure...

nothing looks fried into that, the global behaviour is ... an oscillator.

does somebody have a schematic to dig into?

best regards

iso14000:
so ridiculous I am... schematics are simply above....  :-DD

iso14000:
Hi,

I found some difference with VTP's schematics. (thanks sir , your work is awesome!)
by taking two pictures and precisely match them with Gimp , I redraw the schematics.

In my case , a 10 \$\Omega\$ resistor was out of specs ,         and was glowing in the dark, I chase it with my IR camera.
By changing it, global behaviour is OK.
there are still some mysteries for me :
-what stands for X2 et X1 , they are SOT23 with "28" marking.?
-what is the purpose of T7 et T4?

I cannot see the oscillator activated when I push the degauss button

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