The Sansui problem
I opened up the Sansui amplifier this morning. After setting up the DVM and oscilloscope.
I worked backward from the output and tracked the problem down to a faulty switch. I touched the oscilloscope probe to the wire leads on the switch to examine the signals. Both signals were present, but the act of applying pressure change the output. The signal becam loaded with static. I flipped the switch rapidly a dozen times and the static disappeared. I went through this process of causing static and filpping the switch once more to make sure the problem was consistant.
Both channels are on now, but the switch may cause more problem. I ordered a can of electronic contact cleaner for the noisy volume potentiometer. I'll apply some to the switch. Perhaps that will solve the problem, or forestall further problems.
I worked backward from the output and tracked the problem down to a faulty switch. I touched the oscilloscope probe to the wire leads on the switch to examine the signals. Both signals were present, but the act of applying pressure change the output. The signal becam loaded with static. I flipped the switch rapidly a dozen times and the static disappeared. I went through this process of causing static and filpping the switch once more to make sure the problem was consistant.
Both channels are on now, but the switch may cause more problem. I ordered a can of electronic contact cleaner for the noisy volume potentiometer. I'll apply some to the switch. Perhaps that will solve the problem, or forestall further problems.
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