Need help with heatsink installation, design

z-adamson

Addicted Member
I am in the middle of a Pioneer SX-780 restoration.

One thing I intend to do is increase the mass and surface area of the DC voltage regulator heatsink since they run extremely hot and the original heatsink was / is way undersized.

The original heatsink was basically a small section of channel aluminum. My plan is to get a long section of channel aluminum of the same shape and wall thickness and cut it to a length of about 3 times as long as the original.

See the pics.

Does this week like a good plan?
 

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One thing I fear is the heatsink putting stress on the solder pads of the transistor due to it's length and weight.

So I would have to somehow tightly bond the new heatsink to the board to take the stress away from the solder pads.
 
The existing heat sink is widely considered inadequate and coming up with a bigger one is the norm for anyone restoring a sx780.

Thank you very much for all that info :)
 
Perhaps going 2 times long is enough sink and not too heavy to hold on the board. But I agree about finding a way to clamp/glue it to the PCB and release the force from the transistors.

What about adding it back to back to the original piece?
 
If anyone knew the dissipation of the regulator(?) then maybe a good choice could be made to the necessary size. Smaller sinks are not to expensive. Buying a multi-finned unit might be the way to go rather than trying to make something extra long/tall out of the channel stock. A lot depends, I suppose, on the space available.

This style for a buck or two.

download (1).jpg
 
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I have lots of vertical space and hardly any extra space off to the front, back,sides.

I would love to use one of those already manufactured heat sinks with fins, but space is tight.

I will explore the possibility of the tall channel aluminum for now unless I can find a tall, narrow already manufactured sink.
 
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