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Old 18th September 2012, 11:35 PM   #21
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Perry: Have you been able to tell what these 4 transistors are doing in this circuit? (their function that is..)

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Originally Posted by Perry Babin View Post
The solder connections on the 4 large SMD transistors in this area fail. For testing, you can sometimes simply solder the connections in place. To make it reliable, the transistors need to be removed, the pads cleaned on the board and the terminals cleaned on the transistors.

Sometimes these transistors become intermittent. I've had at least one that checked bad in the board (open B-E junction) but checked OK out of the board so I'd advise checking them in the board as well as out of the board.

If they're readily available, I'd advise replacing them.

I've substituted TO-220 transistors in a few amps but haven't done enough to know if it's 100% reliable (although it should be). I've used 2N6488s and 2N6491s. The transistor shown is a 2N6491. The rest are NPN and would be subbed with the 2N6488 if necessary.
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Old 18th September 2012, 11:57 PM   #22
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I think they're voltage regulators. If I'm not mistaken, they have pure DC on them. They're not used for any switching duty.
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Old 2nd October 2012, 05:17 PM   #23
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Well, I've had the four transistors identical to the originals ...

I have replaced, and to connect the amplifier, this is what happens:
At first, everything seemed fine, (0.057 V at the speaker terminals) but when a minute passed, he began to hear a click intermittent (every second) coming from the area of the power supply, at the same time, the current in the speaker terminals, down to 0 V. ....

If I continue applying current to the amplifier, the click intermittent sound becomes long (rrrrrrrrrrrr) and in turn, the power LED flashes .....

Nothing warms, nothing burns ....

Is it weirder ...
Can there be another intermittent connection?
I can? I have moved some component while handling it?
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Old 2nd October 2012, 09:15 PM   #24
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One of these came into the shop yesterday. After I repair it, I'll make a few measurements on various points and get back to you. If I forget and don't post in a day or so, bump the thread.
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Old 2nd October 2012, 09:45 PM   #25
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Lucky you! I am forever grateful!
We keep in touch.
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Old 3rd October 2012, 11:19 PM   #26
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Perry....
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Old 5th October 2012, 01:58 AM   #27
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Do the solder connections on R2035 (large SMD resistor marked 130) appear to have overheated?

If so, apply new solder, desolder and resolder it. Does that help?
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Old 5th October 2012, 03:29 PM   #28
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Sorry, Perry, no luck ....
I got the R2035, I've checked and I have reinstalled without success.

Is that there is no time to heat up ....
At 30 seconds, the voltage, down to 0V,,,
And continuing a noise near the power supply (rrrrrrrr)
I'll investigate to see exactly where it comes from, this little sound.

Or is there something else I can test, Perry?
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Old 8th October 2012, 01:54 AM   #29
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If you have a scope, confirm that you have a continuous square wave on the center leg of the power supply FETs. With the scope set to 2ms and 10v/div, you should see a wide trace (~2.5 divisions high) that is unbroken across the display.
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Old 8th October 2012, 02:46 PM   #30
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Well, the first picture is, just connect the amplifier and the second after 30 seconds.. Certainly in the second picture, waveform, stutters.. .
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File Type: jpg DSCN3244.JPG (773.1 KB, 55 views)
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