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Switch Matrix - Theory and Troubleshooting
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Repair Guides
Written by terryb June 14, 2012 Skill Rating: Intermediate 0
Written by terryb June 14, 2012 Skill Rating: Intermediate 0
All solid state pinball's use a switch matrix and although the actual implementation may vary slightly, the theory and troubleshooting are the same. The purpose of the switch matrix is to reduce the number of driver circuits form 64 to 16 and minimize playfield wiring. This is achieved by pulsing each column sequentially while monitoring all of the rows. This is why the column is called the strobe, or send side, and the row is called the return side. For a list of common problems and troubleshooting, you can jump to this section...
Tools and Supplies
Written by terryb April 03, 2016 0
Written by terryb April 03, 2016 0
Pinitech just announced a WPC Reverse Switch Tester (see Image 1), which I was able to beta test. I can say definitively that it should be part of the toolkit for anyone who works on pinball games. This simple, inexpensive product (un-assembled $10 and assembled $15) will turn the several hour process of identifying phantom switch closures into a simple 30 minute project. If you opt for the kit it can be assembled in a few minutes as only four connectors need to be soldered onto the board. There are several switch/diode...
Tutorials
Written by terryb April 09, 2013 Skill Rating: Intermediate 0
Written by terryb April 09, 2013 Skill Rating: Intermediate 0
This is part six of a seven part series intended to provide a basic knowledge of electronics, test equipment, service manuals and troubleshooting in order to allow the reader to effectively repair pinball games. Whether you're troubleshooting a circuit or testing your work after replacing an IC, knowing how to read a schematic is a necessity. While you don't need to become a EE, you should be able to walk through a circuit and understand what components are involved and what connects to what. In addition, you should also be able to look at a...
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