I have a Kenwood KAC-7201. I opened it up so i could solder some wires to the inside of the amp. i noticed that one trace was bubbled up for some reason so i blew on it to get some of the **** off of it and it blew away the trace foil. I am wondering how would be the best way of conencting that foil? or should i have an electrician do it? I have some pics of what i am talking about. the first pic is the close up, u can see on the right side of the trace that is broken, it is barely seperated. i even checked with a VOM and theres no connection. I would say for sure fix itmyself but i havnt worked with the copper foil that is broken on there before.

I dont want to connect the amp and see if it works because from what i can see, this is an important part of it. it connects one of the big capacitors that are on the top of the circuit board so if my common sense serves me right, i should have this fixed(or fix it myself) b4 hookin it up

 

Wow, that blew up real good. Can't tell what it's for, maybe a ground, and it shorted out between the large "solder ball" and the 2 smaller ones, and you could just solder a jumper from the large "solder ball" to the copper trace next to the 2 smaller ones, even making contact with both of them, if you make sure the copper is clean in front of them you should be able to "tin" it up, and make a larger solder area, [more contact area] I would also guess that whatever components are on the other side of the 2 smaller "solder *****", [pins] is what went wrong as the burn starts or ends there, it got very hot on that side of the big "solder ball"also, also looks like things got hot on the 2 "solder *****" below the big one, 2nd pix, 2/3 of the way down.

Definitely something has gone west, that will need to be fixed before amp is powered up again, if you just install the jumper and power up the amp it may do more damage. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Wow, that blew up real good. Can't tell what it's for, maybe a ground, and it shorted out between the large "solder ball" and the 2 smaller ones, and you could just solder a jumper from the large "solder ball" to the copper trace next to the 2 smaller ones, even making contact with both of them, if you make sure the copper is clean in front of them you should be able to "tin" it up, and make a larger solder area, [more contact area] I would also guess that whatever components are on the other side of the 2 smaller "solder *****", [pins] is what went wrong as the burn starts or ends there, it got very hot on that side of the big "solder ball"also, also looks like things got hot on the 2 "solder *****" below the big one, 2nd pix, 2/3 of the way down.
Definitely something has gone west, that will need to be fixed before amp is powered up again, if you just install the jumper and power up the amp it may do more damage. 94

</TD></TR></TABLE>

Ditto that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">and it shorted out between the large "solder ball" and the 2 smaller ones, </TD></TR></TABLE> nothing shorted out. something from the other side made a bump in the board(maybe from manufacturing?) and it wasnt on the board right. when i touched it, the green film and the coper came off. I removed more of the green film back to the 2 smaller pins after i tested it out that the link was broken so i could figure out where to start out at.

i soldered the break and it works fine. ill use it and then disconnect the things to check it out after i use it for a while to see how things are going. something from the top warped the board and made a bump in it, thats why the copper broke, thers a bump under it. i will see how it goes tho. the solder blob is going to one of the big capacitors.


Modified by silentblackhat at 12:08 AM 2/18/2006


Modified by silentblackhat at 12:09 AM 2/18/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silentblackhat &raquo;</TD></TR><TR><TD CLASS="quote"> nothing shorted out. </TD></TR></TABLE> Maybe, but it sure looks like things got very hot to the left of that solder ball. 94

 

If you're going to fix it yourself anyway, solder as large a wire as you think will fit cleanly between the big solder ball, and the next largest at the bottom left of the trace in the image).

Still looks like something else is going on in there though. You'll want to watch the power your putting through it for a while..