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Ash
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Joined: Jan 29 2007 - 4:33pm
Fisher "Studio Standard" Receiver issues

Hi there! I just bought a secondhand receiver (probably
early'90's).

Auto Scan Receiver
Ser # S44465 8944
Max output 215W.

The right audio output (both A&B) puts out a weak
signal and doesn't really turn on the speakers. It just
sounds distorted. Right now I have both speakers
hooked up to just the Left side output
and have the balance turned all the way Left. It still
sounds distorted. But... if I select just A or B and
send all of the power to run just one speaker it
sounds great. What do you guys think?
I have recently become very interested in older
systems and would definately like to troubleshoot
and geek out on doing some surgery with some
wire cutters and a solder iron.

Thank you!
Ashley Aymond

Jan Vigne
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Joined: Mar 18 2006 - 12:57pm
Re: Fisher "Studio Standard" Receiver issues

Then I would suggest you do it on a better system than this. A 1990's Fisher receiver is not good quality gear and more than a few parts might not be available at this point.

Unplug the unit from the AC outlet and let it sit for a few hours to dissipate any stored capacitive voltage, then you can remove the top plate of the receiver and look for burned bias resistors. But even if you find one, what are you going to do to fix it? Many of the simplest components in this receiver can't be merely replaced and expect everything to work well. If a resistor burnt out, there is probably another component in front of the resistor that fed it the wrong voltage. If you don't fix that problem first, you will have another burned resistor in a short time. Troubleshooting any receiver will require some knowledge of how a receiver works in block diagram form and a reasonable amount of test equipment. If you can't identify the tuner section from the power amplifier section of a receiver, you will very likely cause more damage than you can repair. Schematics are virtually a necessity and you'll have to know how to interpret what you see on a schematic to what you see in the amplifier. And, if you fix this receiver, you'll still have a 1990's Fisher.

And, please, take to heart the warning label on this receiver. "There are no user serviceable parts." What is in there are potentially lethal voltages and if you have no idea where not to stick your hands or screwdriver, you can kill yourself. If you do not know where to place your left hand while your right hand is probing the boards, you have no business taking the cover off the receiver. Fifteen to twenty amps of 120 volt AC is nothing to fool with. There was at one time a basic troubleshooting page on the internet which has now disapeared. Too bad. Its title was "Experiments in Electrocution".

If you want to refurbish a vintage component, start with something simple and decent, like a 1950-60's Dynaco pre amp. They are cheap to buy and there are plenty of step by step plans available for such a project and the old tube type pre amps are, in this instance, simple enough that you can follow circuit flow without much ability other than tracing a colored wire. Once you have rebuilt a PAS3x you will have something that is worth owning and more knowldege than you'll ever gain by poking around in the Fisher.

xuxu
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Re: Fisher "Studio Standard" Receiver issues

I have a similar problem on a Sony receiver of same vintage, right channel compeltedly useless -- I am too busy to do surgery but I found that the Tape Out RCA jacks are working fine so I am feeding powered speakers and using the receiver as a swithcher / EQ. If you must use the speakers you have now and you are OK with using the Fisch as a preamp , try feeding Tape Out to a $30 Sonic T-amp, possibly getting better sound than the amp inside the Fisher. Good luck!

Ash
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Joined: Jan 29 2007 - 4:33pm
Re: Fisher "Studio Standard" Receiver issues

Thank you guys so much for the quick and knowledgeable response.
What Im hearing is get rid of unit and get something that's actually
vintage. I was told 60's - '70's silve face, made in Japan.

Jan Vigne
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Joined: Mar 18 2006 - 12:57pm
Re: Fisher "Studio Standard" Receiver issues


Quote:
I was told 60's - '70's silve face, made in Japan.

If you mean Fisher made in Japan, no. Buy a Fisher unit that was made in America.

http://www.stereophile.com/historical/605fisher/index.html

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