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Old 6th January 2017, 02:35 PM   #1
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Default Technics SU-V85A

I have a Technics SU-V85A. A friend plugged an mp3 player into the Aux 1 input and the amp popped and went into protection mode. I couldn't get it to recover. I found the schematics and started doing some checking. My probe slipped and I shorted a cap. and a resister. In trying to replace them I tried a 1/4 watt 22 Ohm resister and it fried. I have a problem with the resistor at R477 on the schematic for the Voltage control Amp. circuit. it says it is a 22 Ohm resistor but no clue as to weather it is a 1/4 watt or a 1/2 watt. I have tried 1/4 watt and it fried and popped the cap at C463. Anyone have any idea?
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Old 6th January 2017, 03:01 PM   #2
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The only thing that could pop C463 is reversed polarity as it will stand 100Volts across it. R477 supplies IC401 which I would think has been damaged.
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Old 6th January 2017, 03:07 PM   #3
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That's what I was thinking. I tried reversing R477 And they both fried again. The polarity on c463 is correct. Thanks!
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