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How to find replacement components?(Bridge Rectifier)

Z

Zarni

Limp Gawd
Joined
Dec 21, 2005
Messages
160
Ok so this isn't a PC power supply,however it is a power supply for something else ;)

A friend of mine dropped this off needing help Identifying the part that burnt out.
The way the board is set up it looks like it can be replaced ok once we figure out what the replacement is .

Doing a search the part comes up as an older bridge rectifier (B80-C1500R Data Sheet). As I have VERY little experience with this stuff I am having difficulty finding an easily available part that can be used as a replacement.

A point in the right direction would be appreciated:cool:




pwrsupweb.jpg

B80-C1500Rweb.jpg
 
cjoeu said:
Have you checked digi-key?
Click to expand...

They do have good search tools there,
I can narrow them down to a few ,however the ones that seem close all have some information about them I don't understand.
 
How do you know that the bridge rectifier is bad? I would suspect the 7805 more than the bridge rectifier.

however the ones that seem close all have some information about them I don't understand.
Click to expand...

The difference is probably unimportant. Although the current rating can be important. I tried to download the pdf from the site you linked to however after being told I entered the capcha in wrong 3 times I gave up. I do not have time to play games with systems that need verification that I am human..


Edit: I did not get the pdf however your pic is somewhat readable with my 40 year old eyes.. If this is truly the broken part just find another bridge rectifier that is rated 1.5A and that will fit or can be made to fit. When installing make sure you do not switch the orientation shown on the top of the rectifier meaning make sure the + and - pins are in the same location...
 
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Thanks for the pointers,as I don't know what the important specs are and whats not.

The board was brought to me with a point to the bottom of it where it looks like it got warm and a question if I could help find a replacement component for that spot. So I don't know much about the voltages involved etc.I am not going to get to much into this as it is unfamiliar territory, but it is for a friend and I want to help him where I can.

There is an air gap under the rectifier, so I would think the top of the board would be more discolored than the bottom? However if anything the top looks a little better than the bottom.Could the discoloration come from something else?



Here are some pic's of the bottom of the board and a larger version of the data sheet.
Sorry about he capcha, the direct link seems to trigger that.

lookswarm.jpg


B80-C1500R.jpg
 
You want to measure voltage between the diagonal pins of the rectifier when powered and the fuse is installed. Set the voltmeter to somewhere between 8 to 16V range DC and measure the voltage between the top right pin (as shown in the pic from the bottom) of the rectifier and the bottom left.
 
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drescherjm said:
You want to measure voltage between the diagonal pins of the rectifier when powered and the fuse is installed. Set the voltmeter to somewhere between 8 to 16V range DC and measure the voltage between the top right pin (as shown in the pic from the bottom) of the rectifier and the bottom left.
Click to expand...

So when this is done,if it is bad we will see no voltage?
 
So when this is done,if it is bad we will see no voltage?
Click to expand...

If you get no voltage it is bad if the opposite diagonal pins are showing an AC voltage. I ask that (looking at the other diagonal pins on a suitable AC range) to verify that the transformer is working. I believe you could get another failure mode than 0V dc if one side of the bridge rectifier was working but I do not remember what a DC voltmeter will do with that. My EE teachers if they read this would not be happy with that answer. Although my excuse as graduate with degrees in CS and EE is that for the last 15 years I am primarily a programmer who has written close to 1 million lines of C++ code and has not done very much with the EE degree at least recently. That is except for the +9V DC linear power supply kit I assembled last year for a backyard project.

Edit: What I am talking about here is what the DC voltage will be for a 1/2 wave rectifier (assuming 1/2 of the full wave rectifier is dead):
http://en.wikipedia.org/wiki/Rectifier

A bridge rectifier when working is a full wave rectifier.
 
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