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Re: K150-6 pumps out DC voltage when powered on. [message #27693 is a reply to message #23707]

Sun, 01 March 2020 01:03

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The left power transistor is Q18 and the right one is Q19.

Those voltages are what you would expect with -27 volts on the speaker output, but they do not point to any cause for the circuit malfunction.

If you look at the schematic, there are voltages listed for a number of different points in the circuit. Do you think that you could follow the schematic enough to test some of those posted voltages?

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[Message index]

		K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 August 2015 14:21
		Re: K150-6 pumps out DC voltage when powered on. By: pleat on Mon, 24 August 2015 15:02
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 August 2015 15:06
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 24 August 2015 17:07
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 August 2015 06:27
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 30 August 2015 13:42
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 30 August 2015 14:12
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 31 August 2015 06:38
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 11 February 2020 19:13
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Wed, 12 February 2020 14:52
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Wed, 12 February 2020 17:32
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Wed, 12 February 2020 22:54
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Thu, 13 February 2020 06:40
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 13 February 2020 18:25
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 13 February 2020 20:11
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Fri, 14 February 2020 06:44
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 16 February 2020 23:04
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 17 February 2020 12:38
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 18 February 2020 06:08
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 20 February 2020 21:16
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Fri, 21 February 2020 06:18
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 21 February 2020 21:20
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 22 February 2020 06:28
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 22 February 2020 11:20
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sun, 23 February 2020 06:30
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 February 2020 19:58
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 February 2020 07:20
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 25 February 2020 09:47
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 February 2020 12:17
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 27 February 2020 21:28
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 01 March 2020 01:03
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 01 March 2020 11:45
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 01 March 2020 16:15
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 12:51
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 20:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 22:07
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 03 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 03 March 2020 07:16
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 03 March 2020 07:42
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 03 March 2020 09:13
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 06 March 2020 18:59
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 07 March 2020 06:18
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 07 March 2020 21:25
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 08 March 2020 00:09
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 16:28
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 08 March 2020 19:43
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 21:41
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 21:56
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 09 March 2020 05:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 09 March 2020 08:38
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 09 March 2020 11:59
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 09 March 2020 12:54
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 14 March 2020 17:40
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 14 March 2020 21:58
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 15 March 2020 10:51
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 15 March 2020 13:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 15 March 2020 19:05
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 16 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 16 March 2020 18:56
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 16 March 2020 16:10
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 17 March 2020 07:46
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 11:34
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 11:57
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 21 March 2020 12:26
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 21 March 2020 15:10
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 15:26
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 16:42
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 21 March 2020 20:10
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 22 March 2020 12:24
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 23 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Thu, 26 March 2020 06:59
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 27 March 2020 21:12

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