Looking at an old Onkyo HT-R520 stereo receiver for my brother-in-law. It suddenly quit passing any audio and I’ve found many postings about a DSP chip failure…but in looking inside to try and find the usual suspects, I ran across this little guy that appeared cracked open. (I’m pretty sure that can’t be good) I believe it’s located in the pre-amp board and after a while of searching I found it to be a Super Farad Capacitor. (Pics attached)
Shed a little light on this maybe?

 

More…

 

C7001 Yep, it's blown. Replace and see what happens... What are the specs for it?

 

Here is what the service manual parts detail shows:

 

C7001 Yep, it's blown. Replace and see what happens... What are the specs for it?

Are these the “specs” you mentioned? I’ve not seen a cap like this, but I guess these figures are what would be the same as printed on round ones. Since I’m a “Jackleg repairer” my first thoughts were this is some kind of power thing, like a SS relay or similar…I’m curious on why this particular type cap is used…

 

Are these the “specs” you mentioned? I’ve not seen a cap like this, but I guess these figures are what would be the same as printed on round ones. Since I’m a “Jackleg repairer” my first thoughts were this is some kind of power thing, like a SS relay or similar…I’m curious on why this particular type cap is used…

They are normally used as a battery substitute for storing settings and/or system configurations just like the coin-cell battery in a motherboard stores BIOS settings.
http://www.samwhatech.co.kr/product/datasheet/edlc/DA.pdf

https://adjuntos.yoreparo.com/default/0006/14/0b3fe3997361f64454a872200e5855851f22f0f4.pdf
C7001 DSP section.

 

If an exact size replacement is not available, and there is adequate room, a physically larger cap could be used with longer leads. AND probably a physically larger cap with the same ratings will be more durable, and last longer.

 

Looks like they gave you 3 substitute part numbers. Check them out and the possibility of a 150°C rating and longer service hours. Also, since that one blew, maybe a higher operating voltage spec.

 

They are normally used as a battery substitute for storing settings and/or system configurations just like the coin-cell battery in a motherboard stores BIOS settings.
http://www.samwhatech.co.kr/product/datasheet/edlc/DA.pdf

https://adjuntos.yoreparo.com/default/0006/14/0b3fe3997361f64454a872200e5855851f22f0f4.pdf
C7001 DSP section.

I saw that “DSP section”…I’ve run across many articles of so many of the Onkyo receivers suddenly losing audio, most due to a bad DSP chip. Most are reflowing them and adding heat sinks because the extreme heat was loosening up the solder connections. On this particular model I haven’t seen a “physical” chip with DSP label inside…I believe this unit is similar with DTS? Anyhow, after this fix I can dig in more to the audio missing thing…
Edit: opening up your second link I see that schematic with the DSP section shown. Thanks! Maybe I can grasp enough of that to help guide me…

 

If an exact size replacement is not available, and there is adequate room, a physically larger cap could be used with longer leads. AND probably a physically larger cap with the same ratings will be more durable, and last longer.

That would be better I think too. Especially if I can manage to get the old one off and keep enough there to solder on a replacement—Be great to not have to pull stuff to get that board out….

 

Looks like they gave you 3 substitute part numbers. Check them out and the possibility of a 150°C rating and longer service hours. Also, since that one blew, maybe a higher operating voltage spec.

Thanks for your guidance.

 

Yes, its a super-cap.
Your part is obsolete, but it's datasheet is available on DigiKey where they list two parametric equivalents.

 

Looks like the backup cap to keep the Main Microprocessor happy. Are there "C7001" silk screening adjacent to part?

 

Yes, its a super-cap.
Your part is obsolete, but it's datasheet is available on DigiKey where they list two parametric equivalents.
View attachment 340278

Wow! Thanks for that info. I’ll get busy and order a couple…

 

Looks like the backup cap to keep the Main Microprocessor happy. Are there "C7001" silk screening adjacent to part?

View attachment 340279

View attachment 340280

I thought I looked all over to find that but gave up…and yet there it is!
Silk screen—you mean the print on the board on the underside or solder side? I don’t have it removed but maybe I need to go ahead and pull it?
Side question…this part doesn’t play a role in why the sound suddenly quit?
Thanks again.

 

The "C7001" would be white silk-screen near the part. It would not be underneath as it intended to help identify/locate components. Note the C7004 near the black electrolytic cap as an example. Your pictures don't show all sides surrounding the super-cap.

It the "Main Micro" is not operating properly, all bet's are off as to what will/won't work. If your brain is dead, you legs won't move, same concept.

 

BTW, pay close attention to polarity markings when removing the old super-cap.

 

BTW, pay close attention to polarity markings when removing the old super-cap.

how about these?

 

C7001

 

See the + and - polarity markings on the super-cap