Saint?Just a bad woman

If you want to get electricity, you must first repair the broken circuit board and use your own methods.

First of all, when Esther gets a circuit board to be repaired, the first step is to carefully observe its appearance.If the circuit board has been burned, be sure to carefully check whether the power circuit is normal before powering on the circuit board, and then power on after ensuring that it will not cause secondary damage.

The observation method is a type of static inspection method. When using the observation method, you must carefully check whether the power circuit is normal and make sure it will not cause secondary damage before turning on the power.

Regarding observing whether the circuit board has been artificially damaged, this is mainly from the following aspects:

① Check whether the circuit board has been dropped, causing the corners of the board to deform, or whether the chips on the board have been dropped, deformed or broken.

② Observe the socket of the chip to see if it has been forced to break due to lack of special tools.

③ Observe the chip on the circuit board. If it has a socket, first observe whether the chip is inserted incorrectly. This is mainly to prevent the operator from inserting the chip in the wrong position or direction when repairing the circuit board.If the error is not corrected in time, the chip may be burned out when the circuit board is powered on, causing unnecessary losses.

④ If the circuit board has a short-circuit terminal, check whether the short-circuit terminal is inserted incorrectly.

"Sister Santa Karina...let me take a sip first, just a sip, okay?"

"You drink."

Santa Karina was not restrained or stingy, she opened her legs wider and pushed down Esther's head.

"Gudong—gudong—"

After Esther observed it in place, she directly transformed into Kuafu, said "I am Kuafu", took a sip, and immediately started drinking.

The sweet spring water gurgled out from the spring.

She likes to drink a lot of water before doing anything to fill her empty belly before she gets serious about her work.

In fact, circuit board repair requires a solid theoretical foundation and careful work. Through careful observation by the repairer, the cause of the problem can sometimes be determined at this step.

Step [-]: Observe whether the components on the circuit board are burned out.For example, are the resistors, capacitors, and diodes blackened or blurry?

Under normal circumstances, even if the resistor is burned, its resistance will not change, its performance will not change, and it will not affect normal use. In this case, a multimeter is needed to assist measurement.

However, if the capacitors and diodes are burned, their performance will change and they will not be able to play their due role in the circuit, which will affect the normal operation of the entire circuit. At this time, new components must be replaced.

Step 74: Observe the integrated circuits on the circuit board, such as [-] series, CPU, co-processor, AD and other chips, to see if there are any bulges, cracks, burnt, or blackening.If this happens, it is basically certain that the chip has been burned out and must be replaced.

Step [-]: Observe whether the traces on the circuit board are peeling, burned or broken.Is the sunken copper hole separated from the pad?

Step [-]: Observe the fuse on the circuit board (including fuse and thermistor) to see if the fuse is blown.Sometimes the fuse is too thin and cannot be seen clearly. You can use a multimeter as an auxiliary tool to determine whether the fuse is damaged.

The occurrence of the above four situations is mostly due to the consequences of excessive current in the circuit.However, the specific reason for the excessive current requires a detailed analysis of the specific problem.

But the general idea of ​​​​finding the problem is to first carefully analyze the schematic diagram of the circuit board, and then find its superior circuit according to the circuit where the burned component is located, and deduce it step by step. Based on some experience accumulated in the work, the analysis is most likely to occur. Find the problem place and find out the cause of the failure.

"Why are you still watching? Let's start when we're full."

Santa Karina stroked Esther's fluffy little head like a puppy.

She swallowed all over her face and neck, and even the hair on her temples had glue-like liquid.

Esther drank too eagerly. The spring water surged more and more under the teasing of the spirit snake. If she didn't swallow it in time, it would leak out from the corners of her mouth.

"Suck it-"

It was the sound of the little spirit snake licking her lips. Her stomach had been filled with delicious food, but her taste buds were still not satisfied.

She was still restless, but she knew she couldn't drink anymore now.

If she drinks it, she must save it for the next time. If she drinks it again, she may be filled with the life energy contained in this majestic spring of life and her belly will explode.

Now, she had to get to work and get her hands dirty.

For most circuit boards, the problem cannot be found through the previous observation method.Only a small number of circuit boards will undergo physical deformation due to some special reasons. It is easy to find out the cause of the fault. Most of the circuit boards that have faults still need to use a multimeter to carry out detailed inspection of some main components and key points on the circuit board. Sequential measurement, problem discovery, and problem solving.

Before measuring, you must first determine whether the circuit is dominated by analog signals or digital signals.For circuit boards with schematics, you can judge by looking at the schematics.But for circuit boards without schematics, it is generally judged by the following two methods:

① Observe the components on the circuit board to see if there is a microprocessor on the circuit board. Whether it is the early 80 and 51 series or the widely used DSP now, as long as such a chip appears on the circuit board, it means there is a bus on the board. Structure, digital signals will definitely occupy a large part, so it can be processed as a digital board.

② For circuit boards without microprocessors, observe the components on the board to see if there are many chips using 5V power supply.If there are many 5V power supply chips, it can also be repaired as a digital circuit.The maintenance methods for digital circuits and analog circuits are different. Generally speaking, analog circuits are simpler to repair, and you can deduce them step by step to find the problem.

But for digital circuits, the circuits are all hung on the bus, and there is no clear superior-subordinate relationship.Therefore it is more difficult to repair.

The following only focuses on the static measurement method of digital circuits. Maintenance mainly follows the following steps:

Step [-]: Use a multimeter to check if there is a short circuit between the power supply and ground.

The inspection method is: find a chip powered by a 5V power supply and measure two points on the diagonal (for example, for a 14-pin chip, measure pins 7 and 14, for a 16-pin chip, measure pins 8 and 16).

If there is no short circuit between the two points, the power supply is working roughly normally.If a short circuit occurs, the cause needs to be found through troubleshooting.

These steps are just the basic ideas for power supply repair. For particularly complex circuit boards, specific problems need to be analyzed in detail.The power supply is the foundation of the circuit. Only when the power supply is working properly can we talk about the application of subsequent circuits.Therefore, the measurement of power supply is very important, and it is also a step that is easily overlooked by maintenance personnel.

Step [-]: Use a multimeter to measure the diode and observe whether it is working properly.

Under normal circumstances, the negative pole of the resistor is measured. The positive phase measurement is tens to hundreds of ohms, and the reverse phase measurement is one thousand to several thousand ohms.Generally speaking, when a diode is damaged, it is due to the breakdown of the diode due to excessive current in the circuit.

Step [-]: Use the resistance range of a multimeter to measure the capacitance to see if there is a short circuit or open circuit. If so, it means there is a problem with this part of the circuit.The next step is to determine whether there is a problem with the component itself or the circuit connected to it. The method is to solder off one leg of the suspicious component to see if there is a break or break in the component.This way you can identify the problem in one step.

Step [-]: Also use a multimeter to measure the integrated circuits, transistors, resistors, etc. on the circuit board to see if they meet their own logical performance.

If the circuit board includes a bus structure, there will generally be a pull-up resistor row on the bus.The measurement of the resistor row is a very important step. Through its quality, the quality of the chip hanging on the bus can be preliminarily tested.

After inspection by observation method and static measurement method, most of the problems that arise during circuit board repair can be solved. One thing worth noting is to ensure that the power supply is normal to avoid secondary damage to the circuit board after the next step.

"It's fixed, Sister Santa Karina!"

After a lot of hard work, the circuit board that needed to be repaired was finally repaired as the task given to Esther by Santa Karina.

She spent a lot of effort, and her hands were soaked with white skin. This was proof that she had worked for too long in an extremely humid environment.

She raised her head and looked at the scenery far away in the horizon, the waterfall flowing down, and the colorful rainbow hanging after the water of the waterfall passed by. She showed an unusually sweet smile, and there was a sense of insanity in that smile.

She was so proud of her handiwork that even when Santa Karina was convulsing, she used her head as a support point, not caring that the water wet the floor.

"Well... you are really, really great. Esther."

Santa Karina would never be stingy in praising her sister who was obedient, well-behaved, and worked hard.

Her face is rosy, she is a lady who has been nourished after release.

To be honest, I have transformed the arrogant sister who used to be arrogant and repeatedly used despicable means to threaten and intimidate me back to the obedient and sensible sister who respects me and will do whatever I do without any complaints. really good.

As long as she doesn't act like a weakling, Santa Karina doesn't mind having more of this kind of good thing with a pretty girl.

"Sister Santa Karina, do you want to come a few more times?"

She has completely given up thinking, doing everything according to her heart and happiness.

She just wanted to replenish her vitality, that's all...

She felt that the water flowing down from the waterfall was quite wasteful, so she held some in her hands, then buried her head and drank it all in one gulp like nectar.

After finishing the drink, he was still not satisfied, so he stretched out his little pink snake and licked up the water droplets in his palm one by one.Nothing is wasted.

She was obviously asking about Santa Karina, but actually she wanted it herself.

"I'm very comfortable now, it's my comfort zone~"

Santa Karina smiled evilly and deliberately refused first.

She was playing hard to get, and as expected, a disappointed expression was quickly seen on Esther's face.

If she has orc ears, you can see that the animal ears change from erect to hunched, and the tail also shakes violently from left to right. The wagging tail to please will turn into a big fluffy tail and listless. Hanging there, he looked like he had lost hope and had no hope for life.

"However, if you can cheer up my holy sword, you can use it again, or more times, until you are exhausted, I allow you to treat me as you like~"

Santa Karina took out the beautiful holy sword and looked like she was fooling a child.

Her Holy Sword is one with her, and the Holy Sword is like a little St. Kalina, and also like a clone of St. Kalina.The tails of demons, dragons, and orcs, as long as they are touched appropriately, will feedback extremely intense feelings to their owners.The same goes for the Holy Sword.

"How? Pledge allegiance to my holy sword."

Install the holy sword into the appropriate card slot as a happy clone.Santa Karina put Esther's hand on it, but she only held it weakly, with a trace of struggle in her eyes.

But soon, the evil power took over again. It was the same power that Santa Karina had done to Esther and implanted in the hole in her heart.

As a result, the struggling eyes immediately returned to calm, as if it had never happened.

She regained her sweet smile, the look she loved the most, and became submissive, obedient, and obedient to all of Santa Carolina's requests.

"Okay~Sister Santa Karina, you know, I will not refuse you..."

All her little thoughts disappeared.What remains in the heart is the original desire.

She did all this because of the huge void of nothingness in her heart.

Saint Carina had polluted the hole with special means. If Esther wanted to get the satisfaction of having the hole filled, she could only find it from Saint Carina.It was like a dependency, to the extent that a fish cannot live without water, and Santa Karina was the living water that Esther longed for.

"Hmm..."

She groaned and bit the tip of her tongue.

Then, she lowered her head and moved her head towards the holy sword of Saint Karina, and her lips were about to kiss on the holy sword.

The bloody kiss, some spilled from the corners of her mouth, and combined with Esther's crazy look, she looked extremely coquettish.

"Um..."

Santa Karina also groaned. After the holy sword was nourished by the blood, the wet touch almost paralyzed her brain.

Her limbs and bones were trembling, and the electric current passed through her back, almost hitting the Tianling Cap directly.

From this moment on, the master-slave relationship between the two completely changed.And this change is irreversible.

"Esther, let me teach you. How to maintain a holy sword...well, that is different from how to maintain an ordinary sword."

First of all, swords are mainly composed of three parts: blade, sheath and accessories. Most of them are made of iron, steel, copper, wood and other materials. They should not be stored in humid places, let alone come into contact with substances such as acids and alkalis, so as not to cause damage to the sword. Rusty.

During use, you should try to avoid touching the sword body with your hands to avoid leaving sweat stains on the surface.

Then, the steps to maintain the sword:

1. Wipe the sword: Use pure cotton cloth, flannel or deerskin to gently wipe off the residual oil and dust on the sword. Then dip a little sword oil into cotton gauze and apply it evenly on the sword. After 3 minutes, wipe it hard back and forth with cotton gauze, and continue For about 2-3 quarters of an hour, the sword body must be warmed. The purpose is to remove impurities on the blade surface and promote the chemical change of calcium phosphorus, which is to naturally magnetize and fill the pores on the sword body.

It's important to stay focused at this point to avoid getting cut or poked.

2. Cross sword: Put a long towel on the table, lay the sword flat on it, wrap it with cloth or a small piece of wood (about 1 3 12 cm), use the flat side to rub the blade back and forth hard to make it Slight fever.

When the oil appears to be there but is no longer there, apply a little sword powder on the sword, and then continue rubbing for about a quarter of an hour. Its function is to remove scratches and increase the shrinkage speed of the pores on the sword.The upper movements must be performed calmly, so it can be regarded as an excellent way to cultivate one's moral character.

3. Apply anti-rust oil: If the sword is not raised every day or the living place is humid, a thin layer of anti-rust oil (gun oil, sewing machine oil, or anti-rust oil is acceptable) must be applied before the sword is sheathed to avoid contact with the air. touch.However, if regular maintenance is performed every day, the sword body will be kept clean and bright, which will be conducive to the development of the sword and does not require oiling.

4. Maintenance of accessories: Use the original maintenance cloth or leather to wipe the accessories. If you want to make the copper bright, you can hold it in a cloth circle and rotate it left and right. Because there is residual oil on the cloth, it will have a protective effect to avoid Oxidation produces patina chlorine.

5. Maintain the scabbard: This is the last step to maintain the sword. Hold the scabbard with the original maintenance cloth or leather ring, rub the sword up and down, left and right, to make the wood heat, so that the oil in the wood will slowly emerge on the surface.

After a long time, the entire scabbard surface will be covered with a layer of wood oil, which is like a layer of glossy wax. Not only does it have a wonderful texture, but it only needs a little wiping to keep it smooth forever.

"I understand, Sister Santa Karina..."

Esther was very open-minded to learn. She only needed to have Saint Karina explain the basic sword maintenance methods, and she would be able to draw inferences immediately.

"Your knowledge is very useful to me. However, this holy sword is a precious sword. I must treat it more carefully..."

Her little spirit snake wrapped around the tip of the holy sword, so she certainly understood how powerful this sword was.

And, like the indescribable place, there will also be some delicious liquids coming out of it.

However, the color is different from the glue-like viscous water. It is a milky white liquid that is as sweet as milk.

"If any item wants to be preserved for a long time, it needs careful maintenance. The same goes for swords, which are not stainless or rotten. However, it is not impossible that some have been preserved for thousands of years. Whether it can become a "family heirloom" depends on how to maintain it. Let's discuss it together. Let’s do some research~”

So, Esther prepared sword-raising tools.

Sword Oil: Wipe the sword body to prevent rust.

Talcum powder: removes stains and absorbs excess sword oil.

Soft cotton cloth: Wipe the sword body to remove dirt and evenly oil it.

Tablecloth: prevent damage to tables, chairs and furniture, and prevent scratches on knives and equipment.

Gloves (optional): protect against dirt, scratches, and prevent hand sweat from corroding the metal of the sword.

Plastic wrap: isolates dust and air.

Walnut oil (suitable for wood sheaths): non-sticky, non-sticky, and highly permeable.

Leather care oil (applicable to leather sheaths): colorless, ordinary household leather care ointment can be used.

She first found an open and flat place, placed the sword flat in front of her, and placed it on a clean tablecloth.

Immediately, because she was doing the sacred thing of maintaining the holy sword, her expression was extremely focused and serious.Be calm and concentrate.

Esther held one end of the holy sword, holding a powder packet in her hand, and dipped it in talcum powder to remove stains.The powder packet is slapped directly on the sword body.