Sony STR DH820 receiver powering up once in a while

[bernardolk]

Hey guys, im having trouble powering up/keeping turned on my receiver. I saw this post:https://www.badcaps.net/forum/showthread.php?t=29661
And my problem is exactly the same, however i still dont own a multimeter (going to buy one) and i dont know a single thing about repairing eletronics.
But the thing is that it seems like the problem is the contacts in the relay (based on the other guy experience). I hear a click when i plug in the power, but it will only turn on if there is a second, stronger, click. What i want to know is how can i improve the contacts without soldering It again. In the other post the guy said he sanded the contacts, but english is not my primary language, so im not really sure how to do that or if this is gonna help me at all.
I wish i could post more specific info, but i wanted to lay this here so you guys canould tell the noob here what you pros need to know
I will get the multimeter, but im not really sure where are the key points to test. So if anybody have an experience with this problem on a dh820, or knows how to sand the contacts (i searched but returned nothing usefull) or even what infos more i need to provide, please contribute!
Thanks a lot.

[paulstef]

Re: Sony STR DH820 receiver powering up once in a while

however i still dont own a multimeter (going to buy one) and i dont know a single thing about repairing eletronics.

Isso não é um bom começo. :-)

In the other post the guy said he sanded the contacts,

Vc pode usar uma lima de unha por exemplo ou equivalente. I just had the the same problem on another amplifier, same thing, just cleaned the contacts and it worked again. Remove the plastic cap commonly found on these relays and you'll have access to the contacts. Then use contact spray or as I said, use a sand paper or a nail file.

but english is not my primary language, so im not really sure how to do that or if this is gonna help me at all.

Your English is very good.

[bernardolk]

Re: Sony STR DH820 receiver powering up once in a while

Valeu pela resposta rápida cara hahaeh

This plastic cap is around the relay/contacts or is it part of the relay itself? Now im confused if those contacts are what connects the relay with the board or if they are internal. There are some relay schematics on the other post, maybe that comes in handy.
Btw, using the sand paper or equivalent, wouldn't i shrink the contacts and make them worst? Or the purpose is just to remove the dirt on top of it? Thanks!

[paulstef]

Re: Sony STR DH820 receiver powering up once in a while

Valeu pela resposta rápida cara hahaeh

This plastic cap is around the relay/contacts or is it part of the relay itself? Now im confused if those contacts are what connects the relay with the board or if they are internal. There are some relay schematics on the other post, maybe that comes in handy.
Btw, using the sand paper or equivalent, wouldn't i shrink the contacts and make them worst? Or the purpose is just to remove the dirt on top of it? Thanks!

Yes just to remove the thin oxidized layer. They are spring loaded so there won't be a problem.

[bernardolk]

Re: Sony STR DH820 receiver powering up once in a while

The curious thing is that this is a problem that happened day one after i bought it. I got it fixed, although the guy said it 'had nothing wrong', it worked for a year straight. Now after a while it came back. I just find odd that this happens even with a new product. I will test this later and give my results, thanks!

[bernardolk]

Re: Sony STR DH820 receiver powering up once in a while

Ok, i've bought a multimeter, what are the important spots to measure? Here's a pic of the power board.
Cheers.

[bernardolk]

Re: Sony STR DH820 receiver powering up once in a while

And here is the relay: http://www.radiolocman.com/datasheet.../SDT-S-105DMR2

i'm not sure if i can remove the cap from this one.