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Amp repair
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Old 5th March 2017, 01:45 PM   #1
whojohnjones is offline whojohnjones
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Default Amp repair

I fixed a simple problem in my jbl bp 1200. Now I need to know what thermal paste I need and do I remove the cardboard type material from the caps and the foam from the amp frame...I'm not a amplifier repair guy by any means.
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Old 5th March 2017, 01:54 PM   #2
whojohnjones is offline whojohnjones
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http://i86.photobucket.com/albums/k9...psb9rc1ybk.jpg
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Old 5th March 2017, 02:06 PM   #3
Perry Babin is offline Perry Babin  United States
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Please post the photos using the 'go advanced' and 'manage attachments' method.

What do you mean by cardboard and foam?
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Old 6th March 2017, 01:52 PM   #4
whojohnjones is offline whojohnjones
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There is like a thin layer of foam/cardboard material on uh or some type of strip on the amp case where the transistor rests and tho metal cap there is also the same material
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Old 6th March 2017, 01:55 PM   #5
whojohnjones is offline whojohnjones
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Old 6th March 2017, 02:29 PM   #6
percival007 is offline percival007  England
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That is Thermally Conductive but Electrically Insulating Sheet.

It must not be removed. The Transistors must NOT be allowed to sit directly against the Chassis..................or BANG!!!

Similar can be purchased from your usual supplier of parts or ebay maybe?

No Thermal Paste necessary.

P.
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Old 6th March 2017, 02:50 PM   #7
whojohnjones is offline whojohnjones
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So I wouldn't need thermal paste on this particular amp at all?
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Old 6th March 2017, 05:11 PM   #8
percival007 is offline percival007  England
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No, so long as you use that Thermal Strip/Sheet.

There was no Thermal Paste to remove. Was there?

With the Thermal Strip in place, bolt the Transistors down and then measure for any continuity between the Chassis and the Transistor Tags. There shouldn't be any.
Then you're good to go.

P.
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Old 6th March 2017, 05:53 PM   #9
Perry Babin is offline Perry Babin  United States
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The thermal pads form to the original transistors. The new transistors won't lay down the same way on the pads. The manufacturer doesn't generally recommend re-using them. I'll re-use them but always use heatsink compound on them when I do.
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