Cyrus Power failure - help?

rotebailer · 12th April 2009, 05:14 PM

Hi,

I think my cyrus power amp may have come faulty.
Last night it was ON but not playing music, and a large "thump" from both speakers came out.
After that i get a Yellow flashing light (the manual says its dued to DC voltage detected at the output).

I opened it up, doesnt seem to have nothing blown up...don't know where to start looking and checking. Maybe someone can give me some directions?

Its the Power amp, i believe the first one they made.

Thank you a lot
Filipe

jaycee · 12th April 2009, 11:21 PM

Output power transistors, and probably collateral damage from that.

rotebailer · 13th April 2009, 10:24 AM

Can they be replaced by an enthusiast with a soldering iron?

anybody can give a chime on the part numbers?

Also, if they blew, maybe the cause of failure is somewhat prior to that, which would lead to another blew if all I do is replace the transistors.

How can I measure where is the cause?
Anyone here with experience in cyrus power blew ups?

Thank you

rotebailer · 13th April 2009, 07:26 PM

I took a deep look into the board, it all seems to be SMD resistors, dont know if they can be changed if necessary.

Transistors look to be accessible but i would have to desolder some joints from input and output wires in order to remove the PCB from the case.

If anyone can help here, i would venture but otherwise, i think it will rest in the closet. Shipping it back and forth to cyrus audio for a repair would probably be more expensive than its used value.

jaycee · 13th April 2009, 09:28 PM

Sounds like one of Cyrus's newer amps. Sorry, but that's out of "enthusiast with a soldering iron" territory im afraid

12th April 2009, 05:14 PM	#1
rotebailer diyAudio Member Join Date: May 2006	Cyrus Power failure - help? Hi, I think my cyrus power amp may have come faulty. Last night it was ON but not playing music, and a large "thump" from both speakers came out. After that i get a Yellow flashing light (the manual says its dued to DC voltage detected at the output). I opened it up, doesnt seem to have nothing blown up...don't know where to start looking and checking. Maybe someone can give me some directions? Its the Power amp, i believe the first one they made. Thank you a lot Filipe

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12th April 2009, 11:21 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Output power transistors, and probably collateral damage from that.

13th April 2009, 10:24 AM	#3
rotebailer diyAudio Member Join Date: May 2006	Can they be replaced by an enthusiast with a soldering iron? anybody can give a chime on the part numbers? Also, if they blew, maybe the cause of failure is somewhat prior to that, which would lead to another blew if all I do is replace the transistors. How can I measure where is the cause? Anyone here with experience in cyrus power blew ups? Thank you

13th April 2009, 07:26 PM	#4
rotebailer diyAudio Member Join Date: May 2006	I took a deep look into the board, it all seems to be SMD resistors, dont know if they can be changed if necessary. Transistors look to be accessible but i would have to desolder some joints from input and output wires in order to remove the PCB from the case. If anyone can help here, i would venture but otherwise, i think it will rest in the closet. Shipping it back and forth to cyrus audio for a repair would probably be more expensive than its used value.

13th April 2009, 09:28 PM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Sounds like one of Cyrus's newer amps. Sorry, but that's out of "enthusiast with a soldering iron" territory im afraid

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