The calculator is generally composed of an operator, a controller, a memory, a keyboard, a display, a power supply, and some optional peripherals and electronic accessories, which are composed of manual or machine equipment. The keyboard is the input component of the calculator and is generally contact or sensing. To reduce the size of the calculator, one button often has multiple functions. The display is the output part of the calculator, such as a light-emitting diode display or a liquid crystal display.
The low-end calculator's arithmetic unit and controller are implemented by digital logic circuits for simple serial operations.The random access memory has only one or two units for accumulating storage.
The high-end calculator implements various complicated arithmetic programs by microprocessor and read-only memory, and has more random storage units for storing input programs and data.
The key position of the calculator circuit board is usually required to be tested before assembly to ensure the pass rate of the calculator. Nowadays, the key position detection of the calculator circuit board needs to accurately place the circuit board on the test board. Manually press each key to test and filter the calculator board.
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