(Topic ID: 293438)

Should I worry about this bridge rectifier?

By Tomass

2 years ago


Topic Heartbeat

Topic Stats

  • 25 posts
  • 10 Pinsiders participating
  • Latest reply 2 years ago by xsvtoys
  • No one calls this topic a favorite

You

Linked Games

Topic Gallery

View topic image gallery

Alfred (resized).png
20210514_183736 (resized).jpg
20210514_183725 (resized).jpg
20210514_183715 (resized).jpg

You're currently viewing posts by Pinsider g-p-e.
Click here to go back to viewing the entire thread.

#12 2 years ago

Yes ^^ -- the solder looks to be original (there is no flaking of the solder mask near terminals). Is it causing problems? If not, why replace it? If worried about the heat, you can add a heat sink to the bridge rectifier without pulling him off the board.

I'd be more worried about those radial caps getting old and leaking corrosive guts on the board than that bridge.

#15 2 years ago

OK -- do you have +12V and -12V coming out of the bridge?
You didn't state which game so I am assuming a System 7. +12V can be found at test point 3 and -12V can be found at test point 4 (meter ground at test point 2).
If original caps, I would examine caps at C7 and C8 for leakage. Either of those two going bad can kill power the the 5V regulator circuit. See if you can measure a doubled voltage at the cathode (banded end) of diode D1. D1 is above the relay. If not doubled, replace C7 and C8.

While you're there, take a look at C12 and make sure he isn't leaking.

#23 2 years ago
Quoted from Schwaggs:

That is a 35 amp rectifier handling only 7 amps. I doubt it even gets warm.

OK - curiosity got me.

KBPC35 series = 1.1V forward voltage drop per diode.
Two diodes always operating simultaneously.
Power = (2)(1.1V)(7A) = 15.4W
Defined thermal resistance = 1.4C/W
Temperature rise = (15.4W)(1.4C/W) = 21.56C temp rise. (rounded to 21.6)
Ambient = 25C typical so operating temp will be about (25 + 21.6) = 46.6C or 115F. Yeah, it will see a temperature rise but far from being too hot.

Promoted items from the Pinside Marketplace
From: $ 30.00
Cabinet - Toppers
+CY Universal
Toppers
$ 13.50
$ 59.95
Playfield - Toys/Add-ons
Hookedonpinball.com
Toys/Add-ons
From: $ 90.00
Tools
Pincoder Store
Tools
$ 69.00
Gameroom - Decorations
Pinball Pimp
Decorations
$ 18.95
Eproms
Pinballrom
Eproms
From: $ 8.00
Cabinet - Other
NO GOUGE PINBALL™
Other
$ 399.95
Lighting - Led
Pin Stadium Pinball Mods
Led
From: $ 5.75
Playfield - Other
Rocket City Pinball
Other
$ 44.99
Cabinet - Shooter Rods
Pinball Shark
Shooter rods
$ 53.95
Eproms
Pinballrom
Eproms
$ 59.95
Playfield - Toys/Add-ons
Hookedonpinball.com
Toys/Add-ons
$ 15.00
Playfield - Decals
Metal-Mods
Decals
$ 17.00
Playfield - Decals
Metal-Mods
Decals
$ 129.00
Cabinet Parts
Bob's Pinball Stuff
Cabinet parts
From: $ 11.00
$ 95.00
Cabinet - Sound/Speakers
Pinball Mod Co.
Sound/Speakers
$ 69.00
Gameroom - Decorations
Pinball Pimp
Decorations
$ 959.00
Flipper Parts
Mircoplayfields
Flipper parts
From: $ 26.95
Playfield - Other
Hookedonpinball.com
Other
$ 5.95
Playfield - Protection
The Pinball Scientist
Protection
From: $ 649.95
Lighting - Led
Pin Stadium Pinball Mods
Led
$ 12.50
Lighting - Led
RoyGBev Pinball
Led
$ 1,059.00
Flipper Parts
Mircoplayfields
Flipper parts
$ 649.95
Lighting - Led
Pin Stadium Pinball Mods
Led
From: $ 399.95
Lighting - Led
Pin Stadium Pinball Mods
Led
3,000 (OBO)
Machine - For Sale
Egg Harbor Township, NJ
$ 115.00
Cabinet - Shooter Rods
Super Skill Shot Shop
Shooter rods
From: $ 9.00
Boards
KAHR.US Circuits
Boards
Wanted
Machine - Wanted
Newcastle, OK
Great pinball charity
Pinball Edu

You're currently viewing posts by Pinsider g-p-e.
Click here to go back to viewing the entire thread.

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!


This page was printed from https://pinside.com/pinball/forum/topic/should-i-worry-about-this-bridge-rectifier?tu=g-p-e and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.