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Old 29th June 2006, 12:33 AM   #1
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Default 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!!!


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Old 29th June 2006, 02:00 AM   #2
Leolabs is offline Leolabs  Malaysia
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Open up and check all the solder joints first.
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Old 29th June 2006, 02:24 AM   #3
anatech is offline anatech  Canada
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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.

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Old 29th June 2006, 05:45 PM   #4
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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.
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Old 29th June 2006, 06:25 PM   #5
anatech is offline anatech  Canada
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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.

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