Right Channel Noise

cwoodall · 29th June 2006, 12:33 AM

I have a Sansui 5000A that is making a variable scratchy staticky (is that a word?) noise, from the right channel only. It has System A, System B, & System C (left & right) speaker outputs. All of thr Right's are making the noise, the Left sounds fine. I have a service manual w/schematic on the way in the mail, but it's killin' me. I've chopstick'd around and can't prod anything that makes the noise go away. The music plays......I can choose Aux, AM, FM, Phono, and there is no change....It's definitely a "Right Channel" issue. Cranking on any of the pots (balance, bass, treb) doesn't alter the scratchyness. Am I looking at a bad transistor? Capacitor? I'm trying to decide how to trace and trouble shoot components, starting from the speaker outputs and working backwards........HELP!!!

Thanks,

CW

Leolabs · 29th June 2006, 02:00 AM

Open up and check all the solder joints first.

anatech · 29th June 2006, 02:24 AM

Hi cwoodall,
I have found transistors, capacitors and resistors making that noise. Sometimes this type of problem takes more luck than anything to find.

Does the noise get worse as the set warms up?

Speakers A, B and C all go to the same R or L amplifier circuit.

-Chris

oldsthunder · 29th June 2006, 05:45 PM

I have had quite a bit of success at isolating noisy components and bad solder joints by using Super Cold freeze spray. You can usually zero in on the offending component.

anatech · 29th June 2006, 06:25 PM

Hi oldsthunder,
Right on.
That's where I was going. Either heat or cold depending.

Remember to leave about 10 sec. between treatments so the part can respond. If you run through too fast you will be fooled. Try to contain the heat or cold to one part if possible. It may take some practice. The cheap freeze spray does not work well. Pick up several cans so you don't get one the employee's were freezing flies with.

-Chris

29th June 2006, 12:33 AM	#1
cwoodall diyAudio Member Join Date: Aug 2005	Right Channel Noise I have a Sansui 5000A that is making a variable scratchy staticky (is that a word?) noise, from the right channel only. It has System A, System B, & System C (left & right) speaker outputs. All of thr Right's are making the noise, the Left sounds fine. I have a service manual w/schematic on the way in the mail, but it's killin' me. I've chopstick'd around and can't prod anything that makes the noise go away. The music plays......I can choose Aux, AM, FM, Phono, and there is no change....It's definitely a "Right Channel" issue. Cranking on any of the pots (balance, bass, treb) doesn't alter the scratchyness. Am I looking at a bad transistor? Capacitor? I'm trying to decide how to trace and trouble shoot components, starting from the speaker outputs and working backwards........HELP!!! Thanks, CW

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29th June 2006, 02:00 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Open up and check all the solder joints first.

29th June 2006, 02:24 AM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi cwoodall, I have found transistors, capacitors and resistors making that noise. Sometimes this type of problem takes more luck than anything to find. Does the noise get worse as the set warms up? Speakers A, B and C all go to the same R or L amplifier circuit. -Chris

29th June 2006, 05:45 PM	#4
oldsthunder diyAudio Member Join Date: Jun 2006	I have had quite a bit of success at isolating noisy components and bad solder joints by using Super Cold freeze spray. You can usually zero in on the offending component.

29th June 2006, 06:25 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi oldsthunder, Right on. That's where I was going. Either heat or cold depending. Remember to leave about 10 sec. between treatments so the part can respond. If you run through too fast you will be fooled. Try to contain the heat or cold to one part if possible. It may take some practice. The cheap freeze spray does not work well. Pick up several cans so you don't get one the employee's were freezing flies with. -Chris

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