I had a problem with my black knight 2000. Had a bad leg on the bridge rectifier on the power supply. Replaced it and it seems pretty hot. Is this normal?

#2 7 years ago

---

ForceFlow

Pinside Moderator

9y 238K 31,369 268 14

What did you replace it with? If it's not rated to handle the current, a lesser bridge rectifier will overheat.

#3 7 years ago

???

I will have to double check that. I went to the electronics store and brought the old bridge and told the guy "I need one of these". I'm no genius with the boards so I was pretty stoked when I got the machine working.

#4 7 years ago

BTF

PinballManiac40

Pinside+ Frequent

14y 234K 17,632 104

What are the numbers stamped on the side of the bridge rectifier?

#5 7 years ago

???

dsmith

Pinside member

Ajax, ON

11y 33,050 131 4

The machine is at my office. I am going there later today and will check and report back

#6 7 years ago

BLY

MrBally

Pinside member

Paradise, NV

12y 141K 13,936 22 1

In summary, yes, most bridge rectifiers in pinball machines are designed to operate at their upper limits and run very hot.

#7 7 years ago

MJS

schudel5

Pinside member

20y 166K 6,398 27

A 400V, 35A bridge will pretty much work in any machine, from all eras and manufacturer. But regardless, they do run hot, some more than others depending on the circuit they are in. Typically the bridge that is for the +5V runs very hot and will have a heat sink.

#8 7 years ago

???

dsmith

Pinside member

Ajax, ON

11y 33,050 131 4

I checked the old bridge rectifier number. It is kbpc3502w. It is a 35A 200V. The one I replaced it with has the same rating. It just seems pretty hot and was not sure if it should be like that. It is for a power supply for a BK2000. It is the only rectifier on that board?

#9 7 years ago

AMS

barakandl

nvram.weebly.com

12y 132K 10,418

Normal... if you want, you can put a heat sink on it. I normally do if I am replacing that bridge, heat is probably the reason they eventually fail.

The feature lamp bridge probably gets even hotter than that one.

#10 7 years ago

JPD

Dayhuff

Pinside member

Battle Creek, MI

11y 126K 6,353 79 11

Get you some heat sink compound and a big heat sink and attach it to the BR. This will help to dissipate the heat somewhat.

John P. Dayhuff
Battle Creek, MI.
269-979-3836

#11 7 years ago

???

dsmith

Pinside member

Ajax, ON

11y 33,050 131 4

Thanks very much. I appreciate the input.

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