Question about Yamaha Audio Players & Recorders
I got this old amp from a friend who has not being using it fore some time after it broke down. I try to fix it now but the fuse blows right away. Is there any use to try to solve this or should I just throw it away??
That amp could have a great value from your friend, being not thrown out
If you prefer to have a lasting relationship with your friend, you may need
to have it repair , if you can't.
If you prefer to repair, start by isolating components on the amplifier.
Conquer the power supply.
Isolate the transformer from the power supply , and see if the fuse
If still does , you might consider your first option
(cause you have a bad transformer)
But here in our country it is of No problem.these can be rewind as
the original winding.
If the fuse doesn't break then trace on the power supply rectifiers,
capacitors to the output transistors.
Take out the bad power transistors in pairs.
If these resolves the blowing of fuses.
then look for additional possible bad components around it.
You may have a channel busted , but at least you have one running.
It is for you to decide, to continue repair or buy the power transistors
and other extra components.
These would at least make your friend happy, if you can have it
Let us know what you find or needs further assistance.
Have a nice day!
Posted on Nov 03, 2012
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Posted on Jan 02, 2017
SOURCE: amp blows fuses
The fuses are there to protect the internals of the AMP.....
Please check that the correct fuses are installed......
if the incorrect ones are installed then a fire may develope...
There should be a manufacturers lable on the external chassis that details the fuses to use....
Fuses now days can be slow blow or fast blow....so the correct fuses must be used.....dont increase the fuse rating past the chassis panel label...but make sure they are correct...if they are correct then the amp needs a service to determine where the peak loadings to the power supply are originating from...
Some one may have installed incorrect fuses in the past...
Cheers from YUBEUT
Posted on Nov 03, 2007
I have a classic 50/50 as well and re-tubed it with JJ el84s, vintage teslas and mullard 12at7s. As long as you replaced it with EL84s, I can't imagine that the output would be increased enough to damage the OT. When I got my 6505 Combo, one of the 6L6s was bad, and it kept blowing fuses and howling like a banshee. I would think that an OT problem would result in a significant loss of output...or none at all. I've gotten DOA tubes from a few places. I would suggest swapping each tube out 1 by 1, until you find it...if that is indeed the problem...before you pay the cash to have it worked on.
Posted on Oct 29, 2007
There could be a short in the rectifier diodes or in the transformer itself. Can you take some measurements inside the unit?
Let me know.
Posted on May 29, 2008
Hi ! I have a soluution and it is about to be published on http://www.howtodothings.com/electronics/how-to-fix-your-guitar-amplifier
Please check in a few days time
Posted on Dec 04, 2008
First off....you didn't say if you are a tech or not. I'll make this really simple.
If you are not a seasoned tech with experience solving carver problems....you will waste tons of time and money guessing what the problem might be.
Carvers are quite the unique beast. They deliver whopping amounts of power in a small chassis. This is done by using a trick switching power supply. There can be any number of possible problems.
To properly diagnose this you will need an oscilloscope, signal generator, variac, and of course a really good quality multimeter that can test diodes and transistors.
IF and only IF you are a seasoned tech with all the above equipment, that has no experience repairing carver, then go online to ebay, find member techman777, and for around $15 you can get a nicely reprinted service manual. Troubleshooting expertise and the manual will take you foreward from there because the manual has a very thorough troubleshooting guide in it.
If you think you can fudge your way through the guide without any serious electronics knowledge, you are in for a rude shock as you will find that you are an earth man trying to read martian.
If you are just a casual fix it guy ( nothing wrong with that !!! ), I strongly suggest that you do NOT make this your first try at fixing an amp.
The value of these, in mint condition, all rebuilt is around $350- $450 on ebay all day long. if you are willing to invest that much, you can look up carver audio repair on google and send it off to them, as they are reported to do a nice job. OR....you can look me up on ebay, send it to me and I will do a nice job too, and that comes from 20+ years of repairing.
I know that this isn't much help, but carvers are very special, and require special knowledge to repair.
Best of luck.....Rob
Posted on Dec 16, 2008
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