The Principle and Maintenance of Simulator Gun Mechanisms
Gun mechanisms are basically divided into two categories: simulator guns and optical guns.
I. Simulator Gun Mechanisms (such as New York Twin Guns) rely on the proportional voltages generated by two potentiometers under the gun base to determine the position of the aiming point. One X-axis potentiometer determines the horizontal position of the gun, while one Y-axis potentiometer determines the vertical position of the gun. The two proportional voltages pass through an analog-to-digital conversion circuit into the motherboard and then are displayed on the cathode ray tube. Common faults of simulator gun mechanisms include:
1. Aiming failure, which is usually due to the absence of proportional voltage, malfunctioning potentiometers, a faulty analog-to-digital converter board, or incorrect calibration settings.
2. No response when the trigger is pulled, which is generally due to a faulty microswitch or broken wiring.
3. No vibration feedback, which is typically caused by a faulty vibration motor or electromagnet, a jammed motor, or a defective driver board.
II. Optical Gun Mechanisms. Most current gun mechanisms fall into this category. These can also be further subdivided into different types. For example, early small-screen Crisis I and II models operate on the principle that the optical gun, motherboard, and screen form a closed-loop signal system. During gameplay, when a target appears on the screen and the trigger is pulled, the computer board outputs a brief signal that makes the screen go black except for a white dot at the target location (due to the short duration, it's hard for the human eye to detect). This white dot replaces the target image, with target codes embedded within the white block. If the gun muzzle is aimed at the target at this moment, the photoelectric converter inside the gun generates a code signal that is sent to the computer board, which then determines whether the target has been hit. If the target is hit, the computer board controls the generation of images and sounds indicating a successful hit, which are transmitted to the screen and speaker.
Another type is the many large-screen gun mechanisms currently in use. Around their screens, there is a ring of emitter boards that emit light, which is received by the photoelectric converter board inside the gun and converted into electrical signals. These signals are then processed by the computer board to determine if the target has been hit. Common faults of optical guns include:
1. Inaccurate aiming. For the first type of optical gun that relies on screen light to determine coordinates, common issues include reduced brightness and contrast of the cathode ray tube, dirt on the 45-degree emitting mirror, a faulty photoelectric conversion head inside the gun, blocked light paths, or breaks in the gun wiring. For the second type of optical gun, issues may involve problems with the emitter board, a faulty receiver head inside the gun, or breaks or shorts in the wiring. Incorrect calibration settings can also be a factor.
2. No response when the trigger is pulled, which may indicate a faulty microswitch or wiring problem.
3. No feedback response, which operates on the same principle as simulator guns and should be inspected using the same methods.
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