# Fried my transformer, need help

#### DesertCrawler

Joined Feb 5, 2020
32

#### AlbertHall

Joined Jun 4, 2014
11,098
Another thing I am confused about is, the fuse it runs through blew but the transformer still fried so is it really the board? i really appreciate yall helping. I bit off a little more then i can chew and this project was over \$300
Is the fuse connected before or after the rectifier?
What rating was the fuse?

#### DesertCrawler

Joined Feb 5, 2020
32
Is the fuse connected before or after the rectifier?
What rating was the fuse?
It comes.after the fuse but there is a disc thing in between the power and fuse. Not sure what it is called or what it does. The fuse is rated 250v 5a

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#### AlbertHall

Joined Jun 4, 2014
11,098
5A is a very big fuse for a 2A transformer.
Are you sure that the rectifier is the right way round? (Notched end should connect to the square pad)
What is your supply voltage? Are the jumpers correctly installed?
Can you post the schematic here please.

Joined Jan 15, 2015
5,875
I can't understand why a transformer rated for two amps would be fused at five, I can't see where a circuit like this would have any surge to speak of at turn on. When the last transformer cooked what happened? You applied power and... ? Those transformers are really pretty hard to kill. The rectifier is a 4 Amp bridge. The jumpers are mentioned on page 20. I wish there were an actual schematic. That would make things easier.

Ron

#### DesertCrawler

Joined Feb 5, 2020
32
I can't understand why a transformer rated for two amps would be fused at five, I can't see where a circuit like this would have any surge to speak of at turn on. When the last transformer cooked what happened? You applied power and... ? Those transformers are really pretty hard to kill. The rectifier is a 4 Amp bridge. The jumpers are mentioned on page 20. I wish there were an actual schematic. That would make things easier.

Ron
I was at page 34. I plugged it in and was about about to start step 8. The fuse had already blown but I did not realize it. About a minute after plugging it in the transformer begun the spew smoke i am starting to feel the engineer of this kit did a poor job.

#### AlbertHall

Joined Jun 4, 2014
11,098

#### DesertCrawler

Joined Feb 5, 2020
32
Yes to 115v. I hope you are able to zoom in on these pictures. I do not have a digital schematic.

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Joined Jan 15, 2015
5,875
The F42 fuse reflects being 3.0 Amp then the bridge which you said is keyed correctly followed by a 2 watt bleeder resistor and the choice of filter caps. Something in here is loading that supply and it's a pretty basic crude supply. If you have a meter you could start bu working through the bridge rectifier and measuring across the DC supply. Would you be familiar with how to check components like this?

Ron

#### DesertCrawler

Joined Feb 5, 2020
32
I have a multimeter but I do not know how to check what you are saying

#### AlbertHall

Joined Jun 4, 2014
11,098
What is the voltage rating of C17 and C18?