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Pinball Rehab

pinball repair and restoration

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Using a Logic Probe
One of the simplest and cheapest tools you can include in your test equipment arsenal is a logic probe. Although a lot of people seem overwhelmed by logic probes, they are actually very easy to use. In regards to their purpose, consider a logic probe as a bridge between a meter and a scope. While a meter is great for reading constant voltages (see Image 1) they fall short when a signal is pulsed (see Image 2, which is a 12 volt pulsed signal from the switch matrix). What the meter will try to...
 
 
Testing WPC CPU on the Bench
With a little knowledge and equipment it's possible to test just about every circuit on a WPC-89, WPC-S or WPC-95 board on the bench. This article will walk you through setting up a simple test fixture and testing the CPU board. Keep in mind that replacing circuit board components requires advanced soldering skills and proper equipment. While this article is intended to cover all WPC era CPU boards (WPC-89, WPC-S and WPC-95), there may be some minor differences between generations. For example, position of the component/connector on the board or different...
 
 
 
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