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Pinball Rehab

pinball repair and restoration

Repair Guides

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Switch Matrix - Theory and Troubleshooting
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...
 
 
Solenoid Stays Locked On
This guide will cover troubleshooting a solenoid that locks on when you turn on your game. If the game is not turned off immediately this problem can at best blow the solenoid fuse or at worst fry the coil or circuitry on the power supply board. For our example we'll use a Twilight Zone (WPC Fliptronics 2) where the right jet bumper locks on every time the game is turned on. Here's an excerpted version of the Operator's Manual and WPC Schematic Manual that we'll use during troubleshooting. While there are differences...
 
 
Solenoids Fire at Power On or Game Searching for Balls
There are couple of different reasons why a pinball game will fire multiple solenoids when the machine is turned on, and/or a game is started. Depending on when and how the solenoids are firing will determine which steps you take next. The first scenario is when you turn on the game (this can often be intermittent) several solenoids all fire at once. This indicates a problem with the blanking circuit, which should prevent solenoids from firing until the CPU has completely booted up. If you are having this problem see XXX. The...
 
 
Lamp Matrix - Theory and Troubleshooting
Most solid state pinball's use a lamp matrix. The purpose of the lamp matrix is to reduce the number of driver circuits form 64 to 16 and reduce playfield wiring. Although the actual implementation may vary slightly, the theory and troubleshooting are the same. The lamp matrix works by turning on/off both the supply voltage, which is pulsed at a very fast rate, and the ground (which is also pulsed). Think of it as a light bulb with a switch on both sides; if only one switch is on nothing happens, but when...
 
 
Troubleshooting Blown Fuses
One of the more challenging problems to troubleshoot on a pinball is a blown fuse. The purpose of this article is to provide you with the information to troubleshoot and repair fuse problems. To learn more about fuses, their function and their physical location see Electronics Tutorial Part 1. Identifying Fuse Problems For all further discussion I will use Williams Dracula as an example. While your specific game may vary the general theory presented is still applicable. If you want to play along, which you probably should, click here to open...
 
 
 
5 results - showing 1 - 5