amp repair.......

[zachzchw 5,000+ posts]

Had an amp repaired, this is what the guy told me:

"The amp had a bad transformer. It's still bad, but I think I

isolated it enough to where it won't rub. Not much I can do here.

It'll work, but try not to give it too much vibration. Should last

forever if the transformer doesn't vibrate loose again.

Now that I think about it, go ahead and hook it up with a 10-15A fuse

the first time you do it. The wires don't have to be perfect, just in

case. If everything is ok, you should be good to do whatever with it."

What am I supposed to hook up with the 10-15A fuse? Inside the amp, or put it in place of the standard inline fuse?

Click to read more...

 

[DZNUTTS 10+ year member]

did they give you a warranty.

 

[thch 10+ year member]

Had an amp repaired, this is what the guy told me:
"The amp had a bad transformer. It's still bad, but I think I

isolated it enough to where it won't rub. Not much I can do here.

It'll work, but try not to give it too much vibration. Should last

forever if the transformer doesn't vibrate loose again.

Now that I think about it, go ahead and hook it up with a 10-15A fuse

the first time you do it. The wires don't have to be perfect, just in

case. If everything is ok, you should be good to do whatever with it."

What am I supposed to hook up with the 10-15A fuse? Inside the amp, or put it in place of the standard inline fuse?

basically it sounds like a short is possible because the insulation wore off. luckily the core isn't damaged, allowing the transformer to continue working. it may have been possible to remove and re-wind the transformer, but this is a bit tedious and may end up having bad results.

because you might expect this amp to have a short, it would make sense to use a smaller then needed fuse to ensure that, if a short exists, it will not affect anything. thus for the first time you power up the amp, use a 10A fuse instead of the normal 30A (?) one.

 

[zachzchw 5,000+ posts]

So, after the first time I use it, I can put the normal fuse back in? What exactly does

"isolating the transformer" mean? Should that be a normally priced repair?

 

[thch 10+ year member]

So, after the first time I use it, I can put the normal fuse back in? What exactly does "isolating the transformer" mean? Should that be a normally priced repair?

i think he means "there are frayed wires on the transformer, but i've moved them apart so they aren't touching, thus preventing a short circuit. if they vibrate enough they may move back and touch each other, blowing the fuse."

as for price? its not really much of a "repair" as a "workaround". he fixed it in that it will work, but it may break again in the future. of course if he had to replace parts, that is different. i'm wondering why he couldn't use some hot glue or fiberglass to isulate the frayed wires.

 

[zachzchw 5,000+ posts]

If I replace the normal 80amp fuse with a 10-15 amp fuse, and then attempt to power on the amp, wont that instantly blow the fuse? The amp will draw more than 15amps of current, right?

 

[dantheman8328 10+ year member]

when you first turn it on with the 15amp fuse, turn down all the gains and the source unit too so it only draws a small amount of power, and if it runs fine then you shouldnt have a short and can replace the normal 80amp fuse

 

[djman37 5,000+ posts]

Had an amp repaired, this is what the guy told me:
"The amp had a bad transformer. It's still bad, but I think I

isolated it enough to where it won't rub. Not much I can do here.

It'll work, but try not to give it too much vibration. Should last

forever if the transformer doesn't vibrate loose again.

Now that I think about it, go ahead and hook it up with a 10-15A fuse

the first time you do it. The wires don't have to be perfect, just in

case. If everything is ok, you should be good to do whatever with it."

What am I supposed to hook up with the 10-15A fuse? Inside the amp, or put it in place of the standard inline fuse?

can you tell us WHO did the repair?

 

[JimJ 5,000+ posts]

It's hard to "fix" bad transformers...if the windings are frayed internally, you're going to be SOL until you outright replace the entire thing. Which shouldn't be too expensive (after all, these are push pull MOSFET amps, not the most demanding application for an output transformer //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif)

 

[zachzchw 5,000+ posts]

can you tell us WHO did the repair?

KB.

 

[zachzchw 5,000+ posts]

Anyone else want to add anything?

 

[djman37 5,000+ posts]

sounds like he just wants you to run it with a low amperage fuse IN CASE something's still bad... IMO HE should have done all the testing, after all you pay him to FIX it, not maybe fix it.

 

[zachzchw 5,000+ posts]

sounds like he just wants you to run it with a low amperage fuse IN CASE something's still bad... IMO HE should have done all the testing, after all you pay him to FIX it, not maybe fix it.

Yes, he siad he tested it before he sent it out. He suggested I use the small fuse just in case the transformer shifted during shipping.

Didnt mean to give the impression that he "possibly" fixed it, just watned to find out more about the transformer thing.

 

[djman37 5,000+ posts]

Yes, he siad he tested it before he sent it out. He suggested I use the small fuse just in case the transformer shifted during shipping.Didnt mean to give the impression that he "possibly" fixed it, just watned to find out more about the transformer thing.

aahh.. good. I can see why he'd want a small fuse then at first. So, how'd it work?

 

[zachzchw 5,000+ posts]

aahh.. good. I can see why he'd want a small fuse then at first. So, how'd it work?

Havent tested it yet.....My car isnt quite wired up just yet....

Im gonna test it in a friends car in the next day or two. Hopefullly, it works very well.