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Re: Kasino U 100 ? & Hola! [message #25527 is a reply to message #25525]

Fri, 09 September 2016 00:40

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

If as you say the red wire was disconnected, the positive side of the power supply was missing from the amp when you turned it on. This would cause the power amp to shift the speaker output to the negative side of the power supply, which probably caused the fuse to blow. What damage was caused by this is unknown and really unpredictable. The best way to find out is to test the parts.

If you have replaced the fuse and turned the amp back on, if the bridge rectifier was damaged, the new fuse would blow. Same for the power amp transistors, well most of them at least.

If you can power up the amp, leave the speaker disconnected for now until you check for voltage on the speaker jack. Measure the dc voltages at the two main filter caps. The red wire is the positive side and the green is the negative side. You should read somewhere around 40 dc volts pos and neg. Read the dc voltage across the speaker jack. You should get a reading of less than 1/2 dc volt at the speaker jack. A few millivolts is more normal there.

All of this assumes that you have the equipment and skill set to work on a live amp.Remember that a live amp can do you physical harm, so if you don't feel comfortable in making these tests, then don't.

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[Message index]

		Kasino U 100 ? & Hola! By: yuzerneigm on Mon, 05 September 2016 17:40
		Re: Kasino U 100 ? & Hola! By: stevem on Tue, 06 September 2016 06:24
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Tue, 06 September 2016 19:15
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 07 September 2016 20:13
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 07 September 2016 20:58
		Re: Kasino U 100 ? & Hola! By: stevem on Thu, 08 September 2016 07:03
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Thu, 08 September 2016 09:06
		Re: Kasino U 100 ? & Hola! By: chicagobill on Thu, 08 September 2016 12:14
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Thu, 08 September 2016 14:53
		Re: Kasino U 100 ? & Hola! By: chicagobill on Fri, 09 September 2016 00:40
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Fri, 09 September 2016 02:38
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Fri, 09 September 2016 21:05
		Re: Kasino U 100 ? & Hola! By: stevem on Sun, 11 September 2016 06:23
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Tue, 13 September 2016 00:35
		Re: Kasino U 100 ? & Hola! By: stevem on Tue, 13 September 2016 06:05
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Tue, 13 September 2016 22:33
		Re: Kasino U 100 ? & Hola! By: chicagobill on Wed, 14 September 2016 00:09
		Re: Kasino U 100 ? & Hola! By: stevem on Wed, 14 September 2016 06:13
		Re: Kasino U 100 ? & Hola! By: pleat on Wed, 14 September 2016 15:57
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 14 September 2016 16:01
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 14 September 2016 16:13
		Re: Kasino U 100 ? & Hola! By: chicagobill on Wed, 14 September 2016 17:44
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 14 September 2016 18:15
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Wed, 14 September 2016 20:39
		Re: Kasino U 100 ? & Hola! By: chicagobill on Thu, 15 September 2016 00:38
		Re: Kasino U 100 ? & Hola! By: stevem on Thu, 15 September 2016 06:14
		Re: Kasino U 100 ? & Hola! By: yuzerneigm on Sun, 18 September 2016 13:01

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