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Alexander
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Join Date: Oct 2015
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Tektronix TDS520A

10/06/2015 6:56 AM

Hi all!

I have a oscilloscope Tektronix TDS520A. Flowed capacitors, I made a mistake between 33*10V and 10*35V, and now do not know how to put. If there are owners of the same model, please send me a photo of both the boards with high resolution.

Thx
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IdeaSmith
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#1

Re: Tektronix TDS520A

10/06/2015 7:08 AM

Try the manual.

http://www.tek.com/oscilloscope/tds520a-manual/tds520a-524a-540a-544a-service-manual

You need to register to get there.

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Alexander
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#2
In reply to #1

Re: Tektronix TDS520A

10/06/2015 7:21 AM

Unfortunately on Tek site no manuals with circuit diagram
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Crabtree
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#5
In reply to #2

Re: Tektronix TDS520A

10/06/2015 11:52 AM

I bet their phone numbers are there. You've tried ringing them and talking the problem though with someone, haven't you? That's what I'd do, then I'm funny that way.

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Brave Sir Robin
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#6
In reply to #5

Re: Tektronix TDS520A

10/06/2015 12:14 PM

The only problem there Mildred is that they are much more interested in selling you a new one than helping you fix the old one or at the very least sending it to one of their service centers ($$$).
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Crabtree
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#7
In reply to #6

Re: Tektronix TDS520A

10/06/2015 12:44 PM

Ah. Capitalism. Isn't it wonderful?

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Brave Sir Robin
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#12
In reply to #7

Re: Tektronix TDS520A

10/06/2015 1:07 PM

But I'm a cheap old 8astard, so like the OP I would do everything I could to fix myself.
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Alexander
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#16
In reply to #5

Re: Tektronix TDS520A

10/07/2015 6:05 AM

My English is very bad unfortunately
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Mikerho
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#3

Re: Tektronix TDS520A

10/06/2015 10:53 AM

What do you mean by "Flowed capacitors"?

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Alexander
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#4
In reply to #3

Re: Tektronix TDS520A

10/06/2015 11:34 AM

It's typical problem for old tektronix devices... http://www.timmestein.nl/blog/tektronix-tds-520-repair/
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Mikerho
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#9
In reply to #4

Re: Tektronix TDS520A

10/06/2015 12:59 PM

Ah, leaking capacitors. I can see how you got flowed from that.

So, you unsoldered the old capacitors from the board and forgot to mark which values went where.

Hopefully someone will be able to get you close-up pictures of the boards.

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Alexander
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#10
In reply to #9

Re: Tektronix TDS520A

10/06/2015 1:04 PM

yes ....forgot to mark which values went where.
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Mikerho
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#13
In reply to #10

Re: Tektronix TDS520A

10/06/2015 3:33 PM

Isn't this a picture of the same circuit board you have?

It shows where which cap values go where! From the article:

"In the picture above the red dots indicate a 33uF/10V cap and the blue ones indicate 10uF/35V capacitors."

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Alexander
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#15
In reply to #13

Re: Tektronix TDS520A

10/07/2015 4:29 AM

Yes i found this board and repaire my board but need info about second board
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SolarEagle
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#8

Re: Tektronix TDS520A

10/06/2015 12:49 PM

Maybe you could find something here...

http://www1.tek.com/forum/viewtopic.php?f=5&t=314

The following link could give information:
http://www.sphere.bc.ca/test/tek-parts/ ... ta-acq.doc

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#11

Re: Tektronix TDS520A

10/06/2015 1:06 PM

Are you saying you may have put the wrong value cap into the board?

Are these simply filtering caps for power to the board's circuits or are these part of a signal filter?

If they are just DC voltage filter caps the real critical value would be the working voltage (WVDC). Having a little extra capacitance (i.e., 33 µF versus 10 µF) for power filtering is no problem.

I rather doubt the caps are for some form of signal filtering unless they were special high-tolerance caps.

Can you tell me exactly what they are?
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Alexander
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#18
In reply to #11

Re: Tektronix TDS520A

10/07/2015 12:17 PM

I do not know what function they perform. Unfortunately, I took all the electrolytes and only then that they saw the two types of 10*35v and 33*10v.... I thought that only one type of capacitors 33*10V
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SimpleMind
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#14

Re: Tektronix TDS520A

10/06/2015 8:02 PM

If all else fails try TekScopes Yahoo group. Some serious experts on Tek equipment there, but you must register with group to post questions. S.M.

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#17

Re: Tektronix TDS520A

10/07/2015 11:29 AM

I suggest you power it up and measure the voltage where the capacitor pins go. One will be more that 10V.

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Alexander
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#19
In reply to #17

Re: Tektronix TDS520A

10/07/2015 12:27 PM

Tek used five type of voltage +5 -5 +15 -15 and 24v....I'm afraid to turn on the oscilloscope.
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SHOCKHISCAN
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#20
In reply to #19

Re: Tektronix TDS520A

10/08/2015 10:20 AM

Good thinking! To avoid creating any new issues is a very good idea.

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LongintheTooth
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#21

Re: Tektronix TDS520A

10/12/2015 4:00 AM

Install AC capacitors and then measure the polarity of the voltage when operating. Then you can identify orientation for DC caps. If the board is in a tight space use long wires to allow the capacitors to be outside the unit for measurement.

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Alexander
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#22
In reply to #21

Re: Tektronix TDS520A

10/15/2015 8:09 AM

Install both boards, capacitors changed but the test still fails. Check the power supply, instead of +15 volts only +3 volts.I opened the power supply, one road at 15 volts exploded. Check external power supply line rectifiers are all working well. When the power is out without load PSU down to protection mode at the output to zero. What need check in PSU?
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Alexander
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#23
In reply to #22

Re: Tektronix TDS520A

10/15/2015 8:39 AM

I see +15 BIAS and no BIAS +12 (voltage quick changing from -12 to +12 )
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Users who posted comments:

Alexander (9); Anonymous Hero (1); Brave Sir Robin (2); Crabtree (2); IdeaSmith (1); LongintheTooth (1); Mikerho (3); SHOCKHISCAN (1); SimpleMind (1); SolarEagle (1); StandardsGuy (1)

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