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Old 13th December 2001, 07:19 PM   #1
diyAudio Member
Join Date: Dec 2001
Default amplifier repair

I have a Fisher studio standard amplifier CR 78. Of recent the speakers on right channel (both A and B systems) stopped working. I opened the cover found a blown fuse. Replaced and connected the speakers with same result. I am quite ignorant with electronics but don't mind trying if someone would explain what I should do (in layman's language)
I would greatly appreciate the help.
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Old 13th December 2001, 11:00 PM   #2
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Join Date: Feb 2001
Location: Columbia, SC
Trouble shooting something like this from a distance is difficult. If the fuse is a line fuse, that's one thing, if it's for a rail, that's another.
In general, I'd suspect either a blown output device or a dead power supply cap.
Good luck.

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Old 11th January 2009, 01:42 AM   #3
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Try 1) replacing the fuse, 2) switch the speaker. If the same outcome happens with the other channel it could be a shorted speaker or check the wires at where they are connected at the speaker. A stray strand could cause a short.
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Old 22nd January 2009, 11:31 PM   #4
amptech is offline amptech  Scotland
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Default fisher amp fault blown fuse!

Hi there,

Fisher amp's I serviced these back in the day!
Now if I remerber the supply rail+- is roughly 65 volts so if your not sure what your doing of it could be a painful lesson and a costly one
read up up as much as you via webb suite's there's plenty out there to guide you. All ways start learning with battery type amp's before trying these big amp's beceuse there's high voltages with in that can/will kill you!
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