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Old 14th September 2003, 12:27 PM   #1
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Default I just killed my amp - please help me!

Hi everyone,

I was just making an attempt to measure the bias of my amp , and by accident short-circuited the right-channel
output with VCC+ ( 32,6V).
Now, you might think it's his own fault or what an amateur, but maybe you could have a look at the atteched schematic and give me some advice which parts probably are broken (I have marked the point in the schematic).

I would be very glad if someone could help me!

schnitti
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Old 14th September 2003, 02:32 PM   #2
Eccu is offline Eccu  Finland
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Hmmm... what schematic?
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Old 14th September 2003, 02:45 PM   #3
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New attempt
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Old 14th September 2003, 04:28 PM   #4
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Are you sure it is not just the fuse???
It's difficult to se details on your posted schematics....
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Old 14th September 2003, 06:13 PM   #5
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Hi ACD,

yes, the fuse blew too, but I think that's not the only part which has to be replaced. I guess that the output transistors are broken too (2SB1383 / 2SD2083). I attached a bigger detail of the schematic (only left channel), maybe you could have a look.

Thanks,
schnitti
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Old 14th September 2003, 06:32 PM   #6
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Have you actually replaced the fuse or meassured (comparing one channel to the other) that more has been damaged?
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Old 14th September 2003, 08:43 PM   #7
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First after having short-circuited the amp, it was in a "safe mode". I turned it of (main switch), waited a few minutes and then turned it on again. In the same moment the main fuse blew. So I'm a little bit helpness at the moment. By the way it's a small integrated amp from Denon (PMA-201SA).
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Old 15th September 2003, 12:22 AM   #8
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My guess is it is unlikely to be in the gain stage. You probably blew either one of the driver, output or both. Since it is a small integrated amp, the drivers and outputs can be easily replaced. It is also a good idea to change the associated emitter resistors as well.
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Old 15th September 2003, 02:00 AM   #9
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I blew up the pic in corel draw and I would replace the associated resistors and output transistor but before you do that make sure the zener is regulating the base it could be bad
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