Rotel RA-930AX One channel out No sound - diyAudio
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Old 31st August 2009, 09:03 AM   #1
mrfix90 is offline mrfix90  United States
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Default Rotel RA-930AX One channel out No sound

One channel perfectly working. Another channel I can hear sound very faint only if I tunr the volume really high. Do I have some kind of bad transistor or bad capacitor?

I am sure the pots are perfect.

Please help me if anybody has any idea.
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Old 31st August 2009, 10:33 AM   #2
Mooly is offline Mooly  United Kingdom
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Cracked print somewhere ? might be favourite, or cracked track on a pot.
More info needed.
Are all inputs affected ?
A quick test is to (very carefully) buzz the inputs to the power amp if you have no test equipment.
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Old 2nd September 2009, 05:44 AM   #3
mrfix90 is offline mrfix90  United States
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Quote:
Originally Posted by Mooly View Post
Cracked print somewhere ? might be favourite, or cracked track on a pot.
More info needed.
Are all inputs affected ?
A quick test is to (very carefully) buzz the inputs to the power amp if you have no test equipment.
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Old 2nd September 2009, 05:45 AM   #4
mrfix90 is offline mrfix90  United States
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I have digital multimeter. I tried to buzz but no luck. I can hear very faint sound from one channel if I turn the volume very high. Only problem with one channel.
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Old 2nd September 2009, 05:49 AM   #5
Mooly is offline Mooly  United Kingdom
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Are you "buzzing" the inputs to the power amp on the PCB itself ?
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Old 2nd September 2009, 05:51 AM   #6
mrfix90 is offline mrfix90  United States
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yes buzzed the PCB ..no luck..
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Old 2nd September 2009, 05:58 AM   #7
Mooly is offline Mooly  United Kingdom
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Does sound like a "fault" as such then on that channel.
Withhout knowing how experienced you are it's difficult to suggest anything.
If you have only a multimeter I would compare the DC output voltages of the amp with no signal. Should be zero. And then measure the quiescent current of each channel (volt drop over emmiter resistors) and compare good and bad channels. If that shows nothing then it sounds like an "AC" fault... a cap, broken print etc.
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