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Old 03-22-2016, 03:46 PM   #1
Per Hansson
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Default Tektronix 2215 Oscilloscope with preregulator board recap?

Found this beauty at work.
Been neglected in a corner of the warehose for god knows how long!



I took it out of it's casing and gave the casing a thorough wash, came out great!
I don't think it's been used much at all through the years...
But it's slightly older than me being built in '82!

I gave the PCB's a glance over and found one cap looking a little suspect.
Desoldered it and sure enough some electrolyte on the negative leg.
It measured fine though for capacitance and ESR and I didn't have anything to replace it with so I put it back.

What do you say, should I recap it and if so with what?
Most of the caps don't have any model designation.
Of course they are all quality caps like Mallory, Sprague, Nichicon & Nippon Chemi-Con.
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Old 03-22-2016, 04:28 PM   #2
keeney123
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Default Re: Tektronix 2215 Oscilloscope with preregulator board recap?

What does the cap look like when you clean that stuff off?
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Old 03-22-2016, 06:24 PM   #3
R_J
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Default Re: Tektronix 2215 Oscilloscope with preregulator board recap?

Looks like you pulled out a circuit feed-thru when you removed that cap. Its still on the positive lead of the cap. I would just use the scope as is if its working fine now.

Last edited by R_J; 03-22-2016 at 06:26 PM..
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Old 03-22-2016, 07:13 PM   #4
stj
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Default Re: Tektronix 2215 Oscilloscope with preregulator board recap?

you pulled the through-hole plating, but the cap is still fucked.

if i have to use "regular esr" caps, i use panasonic NHG
i cant remember why i selected those, probably temperature or lifespan.
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Old 03-22-2016, 11:29 PM   #5
Per Hansson
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Default Re: Tektronix 2215 Oscilloscope with preregulator board recap?

Quote:
Originally Posted by R_J View Post
Looks like you pulled out a circuit feed-thru when you removed that cap. Its still on the positive lead of the cap. I would just use the scope as is if its working fine now.
Yes I know, the through hole was not actually used for anything, it's a simple dual layer PCB with no tacks on the top where this via went to.
Nonetheless I actually did manage to put it back on anyway, steady hands
Thanks for the tips, guess I'll leave well enough working alone
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