![]() ![]() This causes a inductive voltage spike from the motor to feed into outputs of the motor driver chip (TMC5041). Before the next replacement board was installed, I did a forensic analysis of both the board and the machine to determine why the board was repeatedly failing.īetween reading the forums on Pinside and communication with Stern tech support, the issue appeared to be a connection being intermittently lost to one of the motors while powered up. The Node 10 board failed again one month later. The customer obtained a replacement node board under warranty and we installed it. The first failure occurred 3 months after receiving the machine. So an opto shows as open/inactive when a ball is there or a target is down or a button is pushed, and it shows as closed/active when it's actually not being blocked.The Node 10 board in this machine has failed twice. One thing about opto switches it that they're backwards / inverted (or "normally closed / NC" as you recall from the previous guide on mechanical switch wiring). When the IR light does not hit the detector, like when a pinball or plastic tab is blocking it, the switch is "off" and reported as inactive. When the IR light is hitting the detector, the switch is "on" and reported as active. ![]() (That's why they look dark purple, like the lens covers on your 1990s VCR.) That transistor is packaged up as an IR detector by being wrapped in a special translucent plastic that only allows infrared light to pass through. The IR detector is like a normal transistor, except instead of the base leg being the wire where a little current controls the transistor's "switch" effect, it's a light sensor. ![]() It's a normal LED except instead of its color being red or blue or green, it's infrared. The IR emitter is an LED that's always on, nothing fancy. The following drawings illustrate this process. An IR detector which operates like a switch which is "on" when the IR beam is hitting it, and "off" when no infrared light is hitting it.An infrared LED (called an "IR emitter") that shines a beam towards an IR detector.Opto switches are a bit more complex than mechanical ones, but still pretty straightforward. This wiring guide is for pinball machines powered by aįAST Nano Controller. This guide is old (for FAST Nano-powered machines only) Any pinball machine available to the general public should be reviewed by a licensed Professional Engineer in your region. There may be errors, omissions, or typos here. Although based on broadly adopted methods, FAST Pinball does not employ Professional Engineers and this information is not professional recommendations. Furthermore your local jurisdiction may have regulations or rules which differ from what we discuss here, including wiring colors, standards, techniques, etc. It is your responsibility to ensure you are aware of these risks and comfortable with these processes. The voltages and electricity discussed here can be dangerous and could cause property loss or death. Wiring, high voltage, and electricity can be dangerous. It assumes you've been following our wiring guides, and, since optos are a more complicated version of mechanical switches, it assumes you've read our guide to switch wiring first. This guide explains how to wire opto switches to your FAST I/O boards. ![]() How to wire opto switches & opto switch boards in a FAST Nano-controlled pinball machine ¶ RS: Update Single LED (Legacy Nano Controller) RA: Update All LEDs (Legacy Nano Controller) Wiring guides for FAST Nano-controlled pinball machines ![]()
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