yamaha amp scratching sound

ihodiputah_510 · 22nd April 2006, 06:12 AM

there is a problem in my yamaha amp.
it has a sound but there is scratching sound over it.even the volume control is in minimum level.
oppps!!!there is another prob.,the first time i press the power button,there is a voltage surge-like sound hiting the speakers.
any suggestions would be greatly appreciated.

Netlist · 22nd April 2006, 08:06 AM

What type# has your amp?

/Hugo

clem_o · 22nd April 2006, 08:43 AM

Hi -

"surge" sound on turn-on may mean that your amplifier is giving out a DC offset at its speaker terminals. Take a VOM and measure. A normal amp should have pretty close to zero DC volts, a few mV to a few tens of mV offset should be ok.

Scratchy sound could be bad potentiometers, bad switches, or bad transistors (usually in the amplifier's front-end, if discrete)...

Netlist is right - the model# of your amp would provide some with the knowledge of exactly what kind of amplifier design your unit has, and could give a better idea of the problem...

Cheers!

22nd April 2006, 06:12 AM	#1
ihodiputah_510 diyAudio Member Join Date: Apr 2006 Location: laguna	yamaha amp scratching sound there is a problem in my yamaha amp. it has a sound but there is scratching sound over it.even the volume control is in minimum level. oppps!!!there is another prob.,the first time i press the power button,there is a voltage surge-like sound hiting the speakers. any suggestions would be greatly appreciated.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS: Yamaha DSP-AX620 surround sound amp	DavidJE	Swap Meet	0	21st April 2009 10:57 AM
Yamaha R5 natural sound receiver	OneyedK	Analog Line Level	2	26th December 2007 10:12 AM
Yamaha digital sound projectors	gvr4ever	Multi-Way	2	15th August 2006 11:49 PM
Digital Sound Projection from Yamaha	AAK	Multi-Way	1	12th April 2005 08:34 PM
Yamaha A-760 of the Natural Sound range	Layberinthius	Solid State	0	21st March 2004 11:06 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

22nd April 2006, 08:06 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	What type# has your amp? /Hugo

22nd April 2006, 08:43 AM	#3
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Hi - "surge" sound on turn-on may mean that your amplifier is giving out a DC offset at its speaker terminals. Take a VOM and measure. A normal amp should have pretty close to zero DC volts, a few mV to a few tens of mV offset should be ok. Scratchy sound could be bad potentiometers, bad switches, or bad transistors (usually in the amplifier's front-end, if discrete)... Netlist is right - the model# of your amp would provide some with the knowledge of exactly what kind of amplifier design your unit has, and could give a better idea of the problem... Cheers!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)