Keithley 2612 teardown and repair

[MegaVolt]

I was lucky enough to buy a broken Keithley 2612 (no letters). For repair it had to be disassembled and of course I took photos )

I found a burnt out transistor FQB30N06L. It takes a while to find a replacement from a local store and replace him.

Enjoy the photos for now. Carefully they are big

[MegaVolt]

Continuation.

[serg-el]

Electrolytic capacitors that grow into each other look cool.   
Photo gluing glitch?

[MegaVolt]

Photo gluing glitch?

Yes! )) The high components are shot from different angles and therefore stick together like so much fun.

Let's continue
The device has two channels and each channel is a long and narrow sandwich of 3 boards. The top and bottom of which are just a screen. You've already seen the average board.

Additionally, the types that the shunt closes.

[udok]

Any photo where Q62, Q63 near the big Vishay precision shunt is readable?

[MegaVolt]

Any photo where Q62, Q63 near the big Vishay precision shunt is readable?

The first photo in the thread lets you see them. (it's huge).

But I can lay out the frame taken separately and processed for better readability:

[MegaVolt]

Let's continue

If you remove the two "sandwiches", the boards below become visible.

Screens of wonderful green color in my opinion will have to be replaced.
There is also no wire connecting the ground terminal and the case itself.

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Box.

[MegaVolt]

Next:

[udok]

Thanks for the great photos!

Is the SMPS directly after the power inlet a custom made part too (can not see much on the photo)?
Do the two SMPS share a common power supply?
I am asking because i see only one fancy toroidal transformer with the white windings.
But there are two normal EI ferrite transformers?

[MegaVolt]

Thanks for the great photos!

Is the SMPS directly after the power inlet a custom made part too (can not see much on the photo)?
Do the two SMPS share a common power supply?
I am asking because i see only one fancy toroidal transformer with the white windings.
But there are two normal EI ferrite transformers?

Yes, I have to remove the green screens and add photos. I haven't done them yet.

[razvan784]

Nice photos, thanks for posting them.
The top transistor is obviously destroyed, but the one below also looks like it overheated...
Good luck with the repair!

[MegaVolt]

The top transistor is obviously destroyed, but the one below also looks like it overheated...

Thank you for your attention. I will be changing both transistors. And even already made from to-220 -> d2pak (to-263)

And then I turned the board over: ((((It looks like I won't get off with just replacing the transistor.

[MegaVolt]

And bottom

[MegaVolt]

Additional frames in which the marking is better visible.

If something is missing, write, I will add.

[HighVoltage]

Did the replacement of the FQB30N06L fix the problem?
Is the instrument working again?

May be you can show us its capabilities.

[MegaVolt]

Did the replacement of the FQB30N06L fix the problem?
Is the instrument working again?

Unfortunately, it's not just about transistors. As you can see above, the board under the transformer is charred. I have to rebuild the board or make wire tracks.

To show the possibilities, I have not yet found a single program that can control the device LabTracer 2.9 is free but I can not download it.

I would be grateful for any tips on software that supports the 2600 series without a letter.

[MegaVolt]

Found a problem. There is no series resistor in the gate of the burnt out transistor. And it looks like he was never there. This can be the reason for the overheating of the transistor. Can anyone have a photo of this place from a similar device?

Tried to determine the configuration of the power supply. While I see this:

[MegaVolt]

I turned off everything unnecessary.  Left only the primary power supply and digital boards.  And it works !!!  Swears by a bunch of mistakes, but that's to be expected ))

[MegaVolt]

Soldered the transistors.  Turned on the power .. The tracks under the transformer are still overheating.  I don't understand the reason yet.  It may be worth duplicating the tracks with external wires.

[E-Design]

I turned off everything unnecessary.  Left only the primary power supply and digital boards.  And it works !!!  Swears by a bunch of mistakes, but that's to be expected ))

5001, SMU unresponsive. Did you check that the power supplies measure ok and is the communication ribbon cable plugged in while you are checking?

[MegaVolt]

SMU unresponsive. Did you check that the power supplies measure ok and is the communication ribbon cable plugged in while you are checking?

3 blocks were not connected. Power supply + 2 smu.

[HighVoltage]

Can anyone have a photo of this place from a similar device?

I always wanted a Keithley 2612B, but they are so expensive in working condition and still too expensive when broken. So, I am watching your thread with interest, I most likely will need to repair one of these myself one day.

Anyone here on eevblog that has a 2612 or similar?

[MegaVolt]

Next board:
Power supply unit. Input 100-240V. The output is one single voltage 24V.

[MegaVolt]

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