Blown Fuse

[Why1504]

i just attempted the high voltage test.  The fuse blew.

First, what are the specifications for the fuse? 

Second, how should I proceed?

Thanks!!

 

[Doc B]

First, figure out why the fuse blew. Look over the construction in detail, checking in particular for backwards rectifiers, backwards capacitors and miswired terminals. Make sure everything is correct before you try another fuse and apply power or you could damage the power transformer. Fuse is 1.5A 250VAC 5x20mm.

 

[fullheadofnothing]

Dan's answer on the fuse may not be correct. More information is needed, namely:

When was this kit shipped? (this could also be answered by providing the name the kit was ordered under)

 

[Why1504]

Early March.

 

[fullheadofnothing]

OK. It's a 2 amp slow-blow. The fuse was increased due to some problems people had in the earlier runs, but yours is late enough that it's definitely the 2 amp.

 

[Why1504]

Dan's answer on the fuse may not be correct. More information is needed, namely:

When was this kit shipped? (this could also be answered by providing the name the kit was ordered under)

Frank Perkins

 

[Why1504]

I have looked everything over. Does anything look out of place?

http://s90.photobucket.com/user/why1504/library/

I am about to head to the airport.  I will pick this back up Friday evening.

 

[fullheadofnothing]

p. 40. Last paragraph.

 

[Why1504]

p. 40. Last paragraph.

Please look at last photo and tell me where I messed up.

http://s90.photobucket.com/user/why1504/library/

 

[fullheadofnothing]

You mounted a UF4007 backwards. It is clearly visible in several of your pictures. I cannot say if it is in the last one or not; that website has repeatedly crashed my browser with all the spam.

Read the last paragraph on page 40 and look at the accompanying picture.

 

[Chris65]

Please look at last photo and tell me where I messed up.

It would be much easier to get assistance if you post photos directly on the forum, rather use those spam laden photo hosting sites!

 

[Why1504]

Sorry about photobucket.  I tried to post the pictures from my iPhone and it failed.

 

[Why1504]

You mounted a UF4007 backwards. It is clearly visible in several of your pictures. I cannot say if it is in the last one or not; that website has repeatedly crashed my browser with all the spam.

Read the last paragraph on page 40 and look at the accompanying picture.

I see it now.  I swear I thought the stripes were pointed the same way. Thanks. I can fix that Friday when I get back.

 

[Why1504]

I reversed the UF4007.  Voltages are very low.

10U  39
14U  117
15U  56

They all seemed to be falling the longer it was plugged in.

And, I just discovered the fuse blew again....

 

[Paul Birkeland]

Disconnect the UF4007's where they connect to the power transformer, then perform the power transformer test with a fresh fuse.

-PB

 

[Why1504]

Ok. Got back from the last trip late last night. Disconnected the UF4007's from the power transformer. 

Ran the Powerline Voltage test on page 29. Power was at 124VAC

Ran the Power Transformer Secondary test on page 33.  Power was at .8 which I assume means it failed.

Please advise.

 

[Paul Birkeland]

Do the low voltage windings still measure properly?

 

[Why1504]

Do the low voltage windings still measure properly?

I am waiting on a replacement transformer that should arrive tomorrow.