Integrated amp will not turn on

mjock3 · 11th August 2011, 10:30 PM

I have a Sonic Frontiers Integrated amp that decided not to turn on this morning. There is power, the fuse is good, the switch is good. Where do I go from here to find out why I am not getting power. I checked at the diodes high voltage and I have nothing.

Thanks,

Mark

Michael Bean · 11th August 2011, 10:57 PM

Did you check the power transformer primary for continuity?

Mike

mjock3 · 11th August 2011, 11:30 PM

Yes it has continuity.

Michael Bean · 11th August 2011, 11:43 PM

So if you put the power switch in the "on" position do you get continuity at the AC power plug terminals?

Mike

mjock3 · 11th August 2011, 11:57 PM

Yes, I do.

Mark

wa2ise · 12th August 2011, 12:23 AM

Quote:

Originally Posted by Michael Bean

Did you check the power transformer primary for continuity?

Check the high voltage secondary for continuity as well (disconnect the power plug first!). Did the tube heaters light up?

Michael Bean · 12th August 2011, 12:31 AM

OK, primary circuit is good. Move over to the secondary and check for continuity, you should disconnect the secondary leads to get an honest reading. If that's OK, check the rectifier diodes (use multimeter diode check function) with the transformer leads still disconnected. If those are OK, check all connections in the power supply circuit to make sure there aren't any bad ones.

Mike

mjock3 · 12th August 2011, 12:34 AM

High voltage secondary has a reading of 58.8 ohms. No the heaters did not light up.

Thanks,

Mark

Michael Bean · 12th August 2011, 12:39 AM

OK, you're zeroing in on the problem now. Are none of the heaters working, or just some of them?

Mike

mjock3 · 12th August 2011, 12:50 AM

Thanks, I've got it. One of the wires came loose from the crimp. Fixed it and it is firing up again. THANKS ALOT!!

Mark

11th August 2011, 10:30 PM	#1
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Integrated amp will not turn on I have a Sonic Frontiers Integrated amp that decided not to turn on this morning. There is power, the fuse is good, the switch is good. Where do I go from here to find out why I am not getting power. I checked at the diodes high voltage and I have nothing. Thanks, Mark

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11th August 2011, 10:57 PM	#2
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	Did you check the power transformer primary for continuity? Mike

11th August 2011, 11:30 PM	#3
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Yes it has continuity.

11th August 2011, 11:43 PM	#4
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	So if you put the power switch in the "on" position do you get continuity at the AC power plug terminals? Mike

11th August 2011, 11:57 PM	#5
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Yes, I do. Mark

12th August 2011, 12:31 AM	#7
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	OK, primary circuit is good. Move over to the secondary and check for continuity, you should disconnect the secondary leads to get an honest reading. If that's OK, check the rectifier diodes (use multimeter diode check function) with the transformer leads still disconnected. If those are OK, check all connections in the power supply circuit to make sure there aren't any bad ones. Mike

12th August 2011, 12:34 AM	#8
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	High voltage secondary has a reading of 58.8 ohms. No the heaters did not light up. Thanks, Mark

12th August 2011, 12:39 AM	#9
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	OK, you're zeroing in on the problem now. Are none of the heaters working, or just some of them? Mike

12th August 2011, 12:50 AM	#10
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Thanks, I've got it. One of the wires came loose from the crimp. Fixed it and it is firing up again. THANKS ALOT!! Mark

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