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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sony Audio amplifier takes long to "warm up"
I have a background in electronics but not in audio amplifier.
I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
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#4
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Sounds like a weak cap on the relay drive circuit.
Leonard wrote in message oups.com... I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
#5
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a good possibility.... or just as likely: cold, cracked or otherwise faulty
solder connections on pcb near and around the high heat producing power resistors, semiconductors, etc. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Leonard Caillouet" wrote in message .. . Sounds like a weak cap on the relay drive circuit. Leonard wrote in message oups.com... I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
#6
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In article .com,
wrote: I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. Sounds like the speakers are fed via a relay - commonly to prevent a thump in the speakers at power up time. There will be a timing circuit associated with it. May be even they trip out if there's a large DC offset through the amp. -- *You can't teach an old mouse new clicks * Dave Plowman London SW To e-mail, change noise into sound. |
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