WPC Driver Board Upgrades
These are mandatory upgrades that SHOULD be done to any WPC machines. It is a relatively simple job if you have the correct tools. I do this to EVERY machine that needs to be worked on. Why do we need to do this upgrade ? Mainly because of the infamous "reset" on WPC machines - more to do with the combination of BR2 and C5 - the +5V. If this voltage fluctuates, so does the reliability of the game. Most of this procedure is covered in Clay's guides, but with my "guide" I have provided progress pictures. I replace all the Bridge Rectifiers and Capacitors.
The parts you need are simply ;
Bridge Rectifier - 400V 35A Wire legs, or 600V 35A Wire Legs
Capacitor - 15,000 mfd 25 Volt
Both are available from our Sponsors.
Before we start Removing the Driver board involves one key process - LABEL all connectors to the board - Either place a tag on the cable, or write directly on the connector. This will make it a lot easier to install when done ! Take note of the connectors - do any of them look burnt or hacked ? Check the bottom left hand corner - J120 and J121 - These are GI connectors and are almost ALWAYS toasted. This particular board is in excellent condition, so this is what you want to see ! The reason you need to take note is because you will have to replace the connectors, and it is easy to do that while the board is out to do the upgrades.
Here's the GI connectors - Not a good example of what to look for as this board is very good !
This is the Driver board once removed from the game !
The main culprits - BR1, BR2, BR3, BR4, C11 and C5.
BR5 and C30
These 5 capacitors and 5 Bridge Rectifiers will be removed and replaced. I USED to use a standard soldering station and solder "sucker" - But this time around, I will be using my Desoldering station.
