Mod your Beresford 7520

[fmzip]

Realized I probably should have posted here......


So I swapped my DAC to the Wolfson, this was the only mod thus far. Played fine for several hours. Left it running over night, came back to listen to it and had no sound coming out of the right channel through analog out. On the headphones, the right output is very faint in comparison to the left. All inputs act the same.

I obviously will check the soldering on the DAC under high magnification at the shop tomorrow. Any suggestions as where else I can look for potential problems?

[fmzip]

Looks like I found the issue of an unsoldered pin. Although I do have a lifted pad at pin 17 of the DAC as well......

Stan, is pin 17 connected? Looks like its not.

[StanleyB]

Pin 17 is not connected.

[fmzip]

Thanks Stan....

Gotta say, even with a highly trained solderer, removing/replacing this DAC wasn't that simple.

Nice to have 30x magnification at your disposal

[BryanP]

I would like to change the caps in my TC-7520. I have some Elna Silmic II 47uf 16 volts. Is this the cap you are using?
Regards
Bryan

[fmzip]

I would like to change the caps in my TC-7520. I have some Elna Silmic II 47uf 16 volts. Is this the cap you are using?
Regards
Bryan

I would have liked to use the Nichicon Caps on all locations but due to availability this is what I am doing.


The 100uf caps on this board will be replaced with Nichicon Muse Caps UES1C470MPM
http://www.mouser.com/ProductDetail/...lA%252bw%3d%3d :



The ones on this board marked in red will be swapped with the Elna's you made mention to. Got them all from Digi-Key PN's:
RFS-25v221 2pcs
RFS-16V101 1pc
RFS-16V100 8pcs

Looks like I found the issue of an unsoldered pin. Although I do have a lifted pad at pin 17 of the DAC as well......

Stan, is pin 17 connected? Looks like its not.

Happy to say my DAC issues are resolved!

[fmzip]

Just curious......why isn't the 4.7uf 50v cap replaced in front of the 220uf?

Mine needs to be replaced now that I cut it out!! lol Does it need to be an Elna or will any electrolytic do?

[Gazjam]

that cap isnt related to sound quality..its for the power button.

I've done the mods you are doing and Ive had that cap changed too.
Cant say the power putton works any better!

[fmzip]

that cap isnt related to sound quality..its for the power button.

I've done the mods you are doing and Ive had that cap changed too.
Cant say the power putton works any better!

LOL Gaz!

I've been following your progress in the Beresford threads. You've been an inspiration into my tinkering!


Just curious, will a 35v 4.7uf cap be sufficient in this location?

[Gazjam]

LOL Gaz!

I've been following your progress in the Beresford threads. You've been an inspiration into my tinkering!


Just curious, will a 35v 4.7uf cap be sufficient in this location?

Happy to help!

Good thing about AOS (As you no doubt have noticed) is theres a lot of guys willing to pitch in, share thoughts, successes and cock ups...its all good stuff.

Personally?
I'd leave that cap alone and look into power supplys next....
to me thats the last step on getting the Dac up to its full potential.

...well, until the NEXT mod comes along that is!