(Topic ID: 241080)

Bridge rectifiers


By Geee

34 days ago



Topic Stats

  • 11 posts
  • 9 Pinsiders participating
  • Latest reply 32 days ago by Blitzburgh99
  • Topic is favorited by 1 Pinsider

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#1 34 days ago

I'm a newbie - trying to learn.
Tested out my bridge rectifiers on my Williams Tri-Zone as the controlled lights (sorry but not sure if that's correct phrase - but those lights that are not permanently on) dont work.
Did a diode test with the machine off. The right hand one produced 0.43 reading with black lead from my meter (in diode mode) on positive output, and red on adjacent legs. No reading when reversing leads.
And exactly the same results when testing red lead against negative leg, etc. I think that is correct.

However on the left hand bridge, with black lead on +, I had a reading of 0.425 from each adjacent leg, but when reversing leads (i.e. red lead on +), the reading just climbed until it reached about 0.95. From what I read, this should show no reading. I got identical results when testing the negative terminal (0.425 but 0.95 when reversing leads).

Am I right in thinking this left hand bridge rectifier needs replacement? Could that be the source of the problem with the controlled table lamps?

Thanks for any help

rectifier (resized).JPG
#2 34 days ago

Red to -
Black to side lugs
expect .4 - .6
Black to +
Red to side lugs expect .4 - .6

#3 34 days ago

Can't hurt to replace both.

#4 34 days ago

https://www.greatplainselectronics.com/proddetail.asp?prod=GBPC3504L

7 bucks plus shipping and your good for 30 years. Also you should add an 8 amp fuse to each bridge to stop a fire hazard.

#5 34 days ago

Why are you testing while off? A bridge takes an AC sign wave and converts it to DC. A capacitor smooths the current out. See if it’s producing the expected voltage using the DC volt meter function on you multimeter. Make sure you test the right two legs off the bridge!

#6 33 days ago

thanks for the posts. Strange thing,switched it on and all the light behave as they should.
Either I am the most brilliant technician ever. or else very lucky and must have unknowingly restored a bad connection

#7 33 days ago

Do some more reading on my website http://www.inkochnito.nl
Click on the Bridge Board image.

There is also some extra info on Pinwiki.
http://www.pinwiki.com//wiki/index.php?title=Williams_System_3_-_7#Additional_Fuses

Peter

#8 33 days ago
Quoted from Inkochnito:

Do some more reading on my website http://www.inkochnito.nl
Click on the Bridge Board image.
There is also some extra info on Pinwiki.
http://www.pinwiki.com//wiki/index.php?title=Williams_System_3_-_7#Additional_Fuses
Peter

This is a great product. Once you get to ordering bridges, fuses and clips and the filter caps + the labor this product ends up being a real bargain

#9 32 days ago
Quoted from Geee:

Strange thing,switched it on and all the light behave as they should.
Either I am the most brilliant technician ever. or else very lucky and must have unknowingly restored a bad connection

Those are just slide on spade terminals. Most likely one is loose and probably caused some arcing/burning. Inspect all of the connectors and tighten or replace any that are loose or burned.

My friend's Tri Zone (funny - same game) had a bridge terminal that was so burned away the connector fell off when he touched it. There was no other option but to replace the bridge.

#10 32 days ago

It’s “rectumfiers”. Not “rectifiers”.

Listen to the guys above. They know what they’re talking of.

#11 32 days ago

A large plate of hot wings will give a guy “rectumfires”

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