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Teac AG-6000

thuginator

thuginator

New Member
just picked it up from a goodwill and i'm getting nothing outta it. checked the fuse, it was black. it said it was a 3 amp fuse, but did not specify the voltage, so I pulled my 3 amp 125 volt fuse from my pioneer sx-727 and put it in the teac. turned on for a fraction of a second, then burnt out on me. so my question is, since I cant find anything about the ag-6000 on the web, and since it doesnt give me the proper voltage on the back, does anyone know if the 125v fuse was the wrong one? or is it blowing fuses for a completely different reason?

p.s.- radio shack actually doesnt have any 3a 125v fuses, so now I have no music at least until tomorrow because I blew out my one good fuse. :no:
 
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Could you get a fuse at Wal-mart? There is positively something wrong with your Teac, not the fuse you put in.
 
i'm not going to be able to get fuses till tomorrow, but lets assume it is not a fuse issue. what could be the cause of the blown fuses, and how could it be remedied? if I disassemble it, is there anything I can look for?
 
It sounds like a dead short somewhere. That's the main fuse, right? Take the top off and show us some pics of the layout.
 
pics and specs here..
http://new-hifi-classic.de/Gallery_MO/displayimage.php?album=152&pos=12

youve got a short that you'll need to track down and it may take another fuse or two to do it so might as well pick up a box of 5. get new fuses first. then pull the cover and look around for obviously burnt or damaged parts. if you see none then you'll have to do some handiwork to get a better clue whats gone wrong.

im not familiar with that receiver but most of that era used large metal transistors in the output that can cause what you are seeing if they are shorted. they will look like this and be bolted to a heatsink..
http://cpc.farnell.com/productimages/farnell/standard/42334024.jpg

usually they are easy to remove. two screws usally hold each one in place. remove the screws and carefully remove the transistors. there may be a mica insulator between the transistor and the heatsink. its very important. it needs to go back the same way it came out. you may want to take pics while doing this incase you lose track of something if you've never done this. there may be white grease on these parts where they come together. this is normal. dont wipe it off. also, the transistors may have different part numbers depending where they go in the heatsink. they need to go back in the same sockets. mark them with a sharpie or something so you can return the correct transistor to the correct socket.

once you have pulled the output transistors go ahead and pop a fuse in and try to power up the unit. if it powers up and fuse doesnt blow, you may have shorted output transistor.

let us know what you find out.
 
Photo0219.jpg
Photo0220.jpg

ok, so here are some pics of the top and bottom of the receiver. to the naked eye nothing looks burnt or blown, and i still really don't know what to take apart and fiddle with. i'm gonna get some fuses tomorrow, but i still don't know what to try and fix. everyone has been quite helpful, but maybe with these pictures you can give me a little more detail. thanks guys.:yes:
 
your output transistors are easily seen in the bottom pic you posted. theres a black hunk of aluminum near the bottom right side of that pick. look closely at it and you will see the large transistors bolted to it. if theres enough lead length, that whole assembly may unbolt and lift out to make it easier for you.

the whole procedure to test those isnt hard if you have some kind of electronics experience. it sounds like you probably dont. maybe you should let it be and wait till a buddy comes around thats a geek of some kind to help get to those transistors. if you know anybody that regularly repairs or builds PC's, they may have enough hands on experience to be able to get those out without breaking anything.

its a cool receiver. dont give up on it just yet.
 
yeah, i'm blind. about 2 minutes after i posted the pics i looked and found them. i've become a victim of having no real place to work on stuff, so i end up on my coffee table with a flashlight and a screwdriver. not ideal, but it gets the job done (most of the time. :)) i'll test today and post the results. wish me luck.
 
Ace Hardware is a good place to pick up glass fuses locally. Either 125V or 250V will work fine, so long as the amp rating is correct.
 
we got a place called norvac the radio shack guy referred me to. seems like i should be able to get almost anything from them, including the output transistors, if that is indeed the problem.
 
ok, pulled the 4 transistors and popped in a new fuse and turned it on and it still blew the fuse immediately. so the short must be somewhere else. my experience is limited with this stuff, but i'm not gonna learn unless I try. so what should I try next? ideas?
 
Eww, it sounds like the transformer might be bad. Hope I'm wrong. Look for wires that might be pinched in the chassis.
 
Could also be a diode or power filter capacitor in the power supply. If you want to easily check to see if its the power transformer itself, disconnect all the transformer wires that go to all circuit boards except the wall socket plug and fuse. Be sure to write down where all the wires connect to.

Without a load on the power transformer, if the fuse still blows, its shorted.

If the transformer is ok, then its time for the 'ol trusty volt/ohm meter to test the diodes and power filter capacitors!
 
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