Difference between revisions of "User:Scott Hively/pinball/black knight/bk electronics"

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== Power Supply ==
 
== Power Supply ==
 +
These original power supplies are very inefficient. They generate a lot of heat. Just look at that heatsink on the voltage regulator!<br/>
 +
I have decided to replace the board with a modern after-market replacement. I will rebuild the original and have it as a backup or sell it.
 
[[File:Bk ps old1.jpg|thumb|Original BK PS, installed]]
 
[[File:Bk ps old1.jpg|thumb|Original BK PS, installed]]
 
[[File:Bk ps old2.jpg|thumb|Original BK PS, removed]]
 
[[File:Bk ps old2.jpg|thumb|Original BK PS, removed]]
 
This is the original power supply.  
 
This is the original power supply.  
 
+
<br/><br/>
 
Notice the darkened connectors. If Williams needed more current than a connector could handle, they would use multiple pins. This works great for a while until one of the pins has a bad connection, then the others heat up and they begin to fail. Vicious cycle.
 
Notice the darkened connectors. If Williams needed more current than a connector could handle, they would use multiple pins. This works great for a while until one of the pins has a bad connection, then the others heat up and they begin to fail. Vicious cycle.
<br />
+
<br/><br/>
 
The fuse holder in the lower-right corner was badly corroded. The fuse holder would make bad contact, get hot, and de-solder itself from the board. I installed an off-board fuse holder. That's the grey wire you see coming off the board.
 
The fuse holder in the lower-right corner was badly corroded. The fuse holder would make bad contact, get hot, and de-solder itself from the board. I installed an off-board fuse holder. That's the grey wire you see coming off the board.
 +
<br/><br/>
 +
Also, the 2-pin connector at the bottom-right had the yellow/black wire soldered to the back. This wire is then wire-nutted to the original wires. This was how I found it when I bought it. I'm assuming the male connector on the wires got toasty so someone just soldered wires to the board.

Revision as of 11:42, 23 July 2021

First thing to note is this machine was manufactured in 1981. With age, electrolytic capacitors dry out, plastic connector housings become brittle due to heat / UV / age and electrical contacts oxidize.

And while Williams was innovative in pinball game design, their electrical designs are a bit suspect in a few areas.

Power Supply

These original power supplies are very inefficient. They generate a lot of heat. Just look at that heatsink on the voltage regulator!
I have decided to replace the board with a modern after-market replacement. I will rebuild the original and have it as a backup or sell it.

Original BK PS, installed
Original BK PS, removed

This is the original power supply.

Notice the darkened connectors. If Williams needed more current than a connector could handle, they would use multiple pins. This works great for a while until one of the pins has a bad connection, then the others heat up and they begin to fail. Vicious cycle.

The fuse holder in the lower-right corner was badly corroded. The fuse holder would make bad contact, get hot, and de-solder itself from the board. I installed an off-board fuse holder. That's the grey wire you see coming off the board.

Also, the 2-pin connector at the bottom-right had the yellow/black wire soldered to the back. This wire is then wire-nutted to the original wires. This was how I found it when I bought it. I'm assuming the male connector on the wires got toasty so someone just soldered wires to the board.