Quick repair of PW7011

That was supposed to be a quick fix and it was. My brother in law got this power amplifier on one of a local sales. The device has scratched metal case, so he don't want to keep it for himself. From electronic point of view it looked as it hasn't been opened since if had left factory. The biggest problem was in output selector switch. It was playing only in one position. As you can guess, on that one, that it was bought. I had opened it and looked into it. Contacts of this switch was fully covered with silver oxide. I clean them and amplifier started to work. I also checked potentiometers aren't they generating some pop noise while rotating. At the end, for better comfort, I removed dust and clean it.

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