Where do I plug this into!? Help! ?Heat Sink? - diyAudio
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Old 22nd September 2011, 04:45 AM   #1
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Exclamation Where do I plug this into!? Help! ?Heat Sink?

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This is the piece, what is it!? It came rattling around upon purchase!


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This is where I think it is supposed to go? The J 77 Post?

Do I clip it on there? Does it have to be perfect? Does it have to touch the piece of metal above it?

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Would this be correct? It bends forward slightly. Is that fine? It also touches the metal above.





I don't want to blow my amp up! Thanks!!!!
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Old 22nd September 2011, 05:56 AM   #2
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Turn it around. If it still touches that angled piece in the correct orientation then bend the device forward out of the way or find some other solution to make sure they don't touch.
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Old 22nd September 2011, 06:45 AM   #3
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Quote:
Originally Posted by theAnonymous1 View Post
Turn it around. If it still touches that angled piece in the correct orientation then bend the device forward out of the way or find some other solution to make sure they don't touch.

Can you please elaborate on this? Make sure what doesn't touch. Which object am I supposed to clip this thing on to? Also, how do I go about clipping it on? Is it supposed to go on the j 77 marked piece?
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Old 22nd September 2011, 09:55 AM   #4
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yes it goes there where you held it in the pic. add some thermal grease to the back of the transistor first.
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Old 22nd September 2011, 11:08 AM   #5
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The transistor case is usually tied to the collector. It would be disastrous if you grounded it by allowing the heatsink to touch the chassis.
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Old 22nd September 2011, 09:03 PM   #6
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I am a complete novice at this stuff. Can someone take the time to completely walk me through it in depth and broken down to a novice level?


I'm getting bits and pieces, but I need to know 100% what to do so it doesn't fry my amplifier upon turning it on!

Explain what the piece does, where it goes, how to put it there, and what to do in order to do a perfect install.


Thanks so much guys. The posts have lent insight, I am just scared to not fully understand!
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Old 22nd September 2011, 09:19 PM   #7
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Is there a 2sk214 on the board and does it have a sink on it like that?

What is with the corrosion/ major looking disruption on the MPSU tab visible in the second picture. Is that corrosion or heat sink compound?

I wonder why the bottom left corner of that sink is lopped off. Either it was made to fit that board or it's from another application entirely.

One thing you can do is idle the amp for a moment, shut it down, and check for excessive heat on one of the devices.

The clip on sink shouldn't be put anywhere it touches anything else but the tab it's supposed to cool, and for reasons you probably understand by now, it should seat firmly when placed.

Last edited by Andrew Eckhardt; 22nd September 2011 at 09:22 PM.
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Old 22nd September 2011, 09:53 PM   #8
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It would help if we knew what make and model of amp we are looking at. Then we can have a look at the schematic (if it can be found) and hopefully make some deductions of what sort of cooling is needed where.

From the scratch marks on the J77, the heatsink might well belong there. Or did you make them when checking the fit of the heatsink?

To elaborate on what I said above - the collector of the transistor might be connected to one of the power supply rails, or to an output. Either way bad things will happen if it touches the chassis of the amp.

Last edited by ingenieus; 22nd September 2011 at 09:55 PM.
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Old 22nd September 2011, 10:21 PM   #9
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Its a clip on heatsink for a to220 package.
I put mine on with a spot of superglue so it doesnt drop off in transit.
Obviously means if the transistor goes you need a new heatsink but better than it falling off and cooking the transistor.

In your picture you are trying to put it on backwards !
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Old 23rd September 2011, 06:59 AM   #10
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I suspect it may have fallen off one of the TO-202 cased MPSUxx next to the transistor you guys are looking at.
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