darkhosis
Active Member
Im repairing this Fisher RS-2004A for a friend, he has a sentimental attachment to it. Typical symptoms before total loss of sound - one side went then the whole thing.
The first thing that's apparent is the fuses were blown in the power supply, but Im not sure why. I did a diode test on the bridge rectifier, and I think it's busted:
AC -> neg DC = .521
neg DC -> AC = .525
AC -> pos DC = .521
pos DC -> AC = .525
The other caps look heat affected - the whole board has symptoms of heat damage. What's the first step, assume the power supply needs rebuilding before I can check the power amp?
The first thing that's apparent is the fuses were blown in the power supply, but Im not sure why. I did a diode test on the bridge rectifier, and I think it's busted:
AC -> neg DC = .521
neg DC -> AC = .525
AC -> pos DC = .521
pos DC -> AC = .525
The other caps look heat affected - the whole board has symptoms of heat damage. What's the first step, assume the power supply needs rebuilding before I can check the power amp?
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