In addition to displaying the calculation results, there are often overflow instructions, error instructions, etc.The calculator power supply adopts an AC converter or battery, and the battery can be charged with an AC converter or a solar converter.In order to save power, the calculator uses a large -scale integrated circuit made by CMOS technology.
Calculator composition structure
The calculator is generally composed of an operational, controller, memory, keyboard, monitor, power and some optional peripheral devices and electronic accessories, which are composed of artificial or machinery and equipment.The computor and controller of the low -grade calculator shall achieve simple serial operations by the digital logic circuit. Its random memory is only one or two units for accumulation and storage.High -end calculators are used by microprocessors and read -only memory to achieve various complex computing programs, and there are more random storage units to store input programs and data.The keyboard is an input component of the calculator, and generally uses contact or sensor.In order to reduce the size of the calculator, there are often multiple functions in one click.The display is the output component of the calculator, including light -emitting diode display or LCD display.In addition to displaying the calculation results, there are often overflow instructions, error instructions, etc.Calculate the third -generation electric converter or solar converter and then charge.In order to save power, the calculator does not operate the automatic power off circuit when CM is large -scale.The peripheral devices that can be used by the calculator include miniature printers, box tape machines and magnetic card machines.
From a certain perspective, a broad computer includes electronic calculators.There are also integrated circuits in the electronic calculator, but the function of the calculator is simple and the price is cheaper, which is conducive to good carrying and stability.
In the past, such as abacus, Nippier bone, mathematical watch books, engineering calculation ruler or Adding Machine (Adding Machine) played auxiliary role in numerical calculations.The term calculator originally refers to professional people who run mathematics in paper pen and paper. Such a half -manual computing work is heavier and easy to make mistakes.
Modern calculators are powered by electricity and have a simple device from cheap and credit card size to special calculators such as special calculators.
Calculator purchase
1. Look at speed.The calculation of the calculator must be fast.It is also necessary to ensure that the count is not wrong.
2. The flexibility of the keys.The calculator must be pressed to the number, otherwise it is very troublesome.
3. The screen is clear and there are traces.The calculator must be clear screen and no trace.There is a method here: 1. Press number 8 in a row to detect whether the number is complete.2. Detect whether the decimal point can be displayed (each one must be checked).
4. Whether it is damaged in the outer cover, if it is damaged, dont buy it, it is likely that the electronic parts will fall and damage the calculator.
Calculator fault treatment
1. No display failure
First of all, you should check whether there is a problem with the battery. Since the button battery is susceptible to the contact of the alkaline and liquid corrosion battery, you should pay attention to cleaning during maintenance; second, check the circuit board with wireless head oxidation or even break.Phenomenon.If so, welded with good ground iron; again, remove the calculator battery and dial the multimeter to R × 1  or R × 10, the multimeter black table pen connects the battery positive terminal, the universal table red table pen connects the negative terminal of the battery. ThisWhen a multimeter has a slight deflection, it means that the circuit is basically normal.If the multimeter pointer is not turned off, it means that the circuit is not connected.The multimeter pointer is close to 0, indicating that the circuit has a short -circuit phenomenon, and it needs to be carefully found and eliminated.The multimeter pointer has a slightly larger deflection. If the power consumption of the microprocessor itself is not (genuine does not have a large power consumption), it is due to the increase in the distribution capacitance of the line board.At this time, you need to remove the circuit board, wash it with a dehydrated cotton, and wash it for two or three times, and then use the incandescent platform light to bake for 1 to 2 hours.
2, lack of strokes
Use the soft and soft facial tissue paper to cut into a small strip of nearly 1mm wide, immerse carbon ink (carbon with conductive capacity), dry after a little drying (to have a certain humidity)Adjustable wire), and then dry naturally.If the roots are broken, the carbon paper can be folded for a few layers, and then cut into small pieces and fill it in the right corner of the root.In the assembly, the carbon paper is connected to the wire through conductive rubber.Paper cannot be too high and too wide, so as not to affect adjacent strokes.Use cotton wire to soak carbon ink instead of noodle paper, which is convenient and flexibly selected as the operation.
3. The keys are not spiritual
The reason is that there are dirty things between the key guidance rubber and the circuit board, or the rubber guidance is worse.The formers maintenance only needs to be cleaned with alcohol.For maintenance with worse rubber conductive capacity, you can use scissors to cut the water -absorbent newspaper with strong absorption and abrasion -resistant into small pieces, then stick to the rubber contact with glue, then apply carbon ink on it, and then apply it again after drying., Full dry.