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Re: A-4 Repair [message #26878 is a reply to message #26502]

Thu, 16 August 2018 12:40

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

I believe your reading the schematic wrong as + 34 volts on the red wires is the power supply rail.

If you are seing 34 volts positive on the speaker jack then you have one or more output transistors or driver transistors bad in the positive side of the output stage.

The normal D.C. Voltage seen on the speaker jack 2 seconds after turn on should be less then .045 volts D.C. .

Also if you are seing that level of D.C. Voltage on the speaker jack do not plug in a speaker as 34 volts is = to over 140 watts and you will likely blow the stock speaker (s)!

[Updated on: Fri, 17 August 2018 06:48]

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[Message index]

		A-4 Repair By: Jonomega3 on Sat, 27 January 2018 08:20
		Re: A-4 Repair By: chicagobill on Sat, 27 January 2018 12:26
		Re: A-4 Repair By: Jonomega3 on Sun, 28 January 2018 00:28
		Re: A-4 Repair By: chicagobill on Sun, 28 January 2018 14:13
		Re: A-4 Repair By: Jonomega3 on Sun, 28 January 2018 15:44
		Re: A-4 Repair By: stevem on Mon, 29 January 2018 08:18
		Re: A-4 Repair By: Jonomega3 on Mon, 29 January 2018 21:16
		Re: A-4 Repair By: chicagobill on Mon, 29 January 2018 23:48
		Re: A-4 Repair By: stevem on Tue, 30 January 2018 12:07
		Re: A-4 Repair By: Jonomega3 on Tue, 30 January 2018 13:24
		Re: A-4 Repair By: stevem on Tue, 30 January 2018 15:24
		Re: A-4 Repair By: Jonomega3 on Wed, 31 January 2018 12:47
		Re: A-4 Repair By: stevem on Thu, 01 February 2018 08:23
		Re: A-4 Repair By: Jonomega3 on Thu, 01 February 2018 11:13
		Re: A-4 Repair By: Jonomega3 on Thu, 08 February 2018 15:12
		Re: A-4 Repair By: stevem on Fri, 09 February 2018 08:32
		Re: A-4 Repair By: Jonomega3 on Fri, 09 February 2018 12:54
		Re: A-4 Repair By: chicagobill on Fri, 09 February 2018 15:39
		Re: A-4 Repair By: Jonomega3 on Fri, 09 February 2018 17:07
		Re: A-4 Repair By: Jonomega3 on Fri, 09 February 2018 18:30
		Re: A-4 Repair By: chicagobill on Fri, 09 February 2018 23:46
		Re: A-4 Repair By: Jonomega3 on Sat, 10 February 2018 12:00
		Re: A-4 Repair By: chicagobill on Sat, 10 February 2018 23:54
		Re: A-4 Repair By: Jonomega3 on Sun, 11 February 2018 00:27
		Re: A-4 Repair By: stevem on Sun, 11 February 2018 06:24
		Re: A-4 Repair By: Jonomega3 on Sun, 11 February 2018 10:58
		Re: A-4 Repair By: chicagobill on Sun, 11 February 2018 15:41
		Re: A-4 Repair By: Jonomega3 on Sun, 11 February 2018 21:05
		Re: A-4 Repair By: Jonomega3 on Mon, 12 February 2018 10:10
		Re: A-4 Repair By: stevem on Mon, 12 February 2018 07:29
		Re: A-4 Repair By: Jonomega3 on Mon, 12 February 2018 09:04
		Re: A-4 Repair By: stevem on Mon, 12 February 2018 10:18
		Re: A-4 Repair By: Jonomega3 on Mon, 12 February 2018 10:41
		Re: A-4 Repair By: chicagobill on Mon, 12 February 2018 12:47
		Re: A-4 Repair By: Jonomega3 on Mon, 12 February 2018 13:25
		Re: A-4 Repair By: chicagobill on Mon, 12 February 2018 14:25
		Re: A-4 Repair By: Jonomega3 on Mon, 12 February 2018 16:07
		Re: A-4 Repair By: chicagobill on Mon, 12 February 2018 18:08
		Re: A-4 Repair By: stevem on Tue, 13 February 2018 07:39
		Re: A-4 Repair By: Jonomega3 on Tue, 13 February 2018 11:04
		Re: A-4 Repair By: chicagobill on Tue, 13 February 2018 16:40
		Re: A-4 Repair By: Jonomega3 on Thu, 26 July 2018 12:43
		Re: A-4 Repair By: chicagobill on Fri, 27 July 2018 00:02
		Re: A-4 Repair By: Jonomega3 on Sat, 28 July 2018 14:31
		Re: A-4 Repair By: stevem on Sun, 29 July 2018 06:06
		Re: A-4 Repair By: Jonomega3 on Sun, 29 July 2018 14:10
		Re: A-4 Repair By: Jonomega3 on Thu, 16 August 2018 11:45
		Re: A-4 Repair By: stevem on Thu, 16 August 2018 12:40
		Re: A-4 Repair By: Jonomega3 on Thu, 16 August 2018 13:14
		Re: A-4 Repair By: Jonomega3 on Thu, 16 August 2018 18:51
		Re: A-4 Repair By: stevem on Fri, 17 August 2018 06:51
		Re: A-4 Repair By: Jonomega3 on Fri, 17 August 2018 06:58
		Re: A-4 Repair By: stevem on Sun, 19 August 2018 06:15
		Re: A-4 Repair By: Jonomega3 on Mon, 20 August 2018 12:18
		Re: A-4 Repair By: stevem on Mon, 20 August 2018 12:27
		Re: A-4 Repair By: Jonomega3 on Fri, 24 August 2018 18:22
		Re: A-4 Repair By: chicagobill on Sat, 25 August 2018 00:15
		Re: A-4 Repair By: Jonomega3 on Sat, 25 August 2018 07:58
		Re: A-4 Repair By: Jonomega3 on Sat, 25 August 2018 11:43
		Re: A-4 Repair By: chicagobill on Sat, 25 August 2018 12:41

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