Bit Mania [Hacking]

It was only time to prepare a toolbox, but the sky outside was completely gloomy. The sound of the wind hitting the plastic rain screen of the carport made a crisp sound. He couldn't move an inch.

He gritted his teeth, got down and pushed the cart, and finally crossed the bridge to Zhenxi, and then rushed to the address on the order without stopping.

There were four or five customers on the order waiting for him to come and fix a TV.This number is relatively small compared to the past, because Luo's father has postponed some business relations.

In fact, Luo Zixin's mood at this moment is the most relaxed and happiest of the day. When he finished his boring school studies, he can finally get in close contact with exquisite electrical appliances - yes, for this boy, repairing electrical appliances It is a great enjoyment.He can operate all kinds of electronic equipment with his own hands, and learn a lot from it that is not available in books.

Not long after, the bicycle stopped in front of a house, and Zixin brushed her wind-blown hair carelessly, and knocked on the door. The door opened from the inside, revealing a white-haired face. The old lady lives alone on the ground floor of this house.She took off the reading glasses on the bridge of her nose, wiped them with her sleeves and put them on again, stretched her neck and looked closely at Luo Zixin.

Even the old lady's voice was slow: "Little maintenance man? Come in."

The boy responded, followed the old lady to the living room with the toolbox, and saw the black and white TV at a glance.

It is now 1991. Since the end of the 80s, black and white TVs in China have been gradually replaced by color TVs. The black and white TVs in front of us, supported by seven major signals, can be said to be very old.Zixin went to the TV and squatted down, moving his fingers on the various interfaces and switches on the TV. While checking the faults, he heard the old man say: "It's broken, it can't be turned on..."

Luo Zixin listened quietly for a while, but what the other party said didn't remind him of anything, so he decided to check it himself: "Before I came, did you ask someone else to repair it?"

"No, no." The old man replied.

He thought so too.Repairing such "old antiques" is definitely a thankless job, because its various parts have gradually aged, and problems will follow one after another. If it is repaired here today, there will be problems there tomorrow.What's more, now that color TVs are becoming more and more popular, most people see that the black and white TV is broken, so they just push the boat to buy a color TV to replace it, and they don't want to spend money on repairing it.

He was thinking endlessly in his heart, but the movements of his hands did not stop at all. He used a screwdriver to open the heavy TV case, and a faint burnt smell came into his nose. He opened the tool box he brought, took out the multimeter and put it on After clicking a few places, it is easy to determine that the rectifier tube was blown by the surge current.

The rectifier tube is a kind of use of the diode. Using the unidirectional conductivity of the diode, the alternating current with alternating directions can be converted into a pulsating direct current with a single direction.A good diode costs 60 yuan or more, and here...Zixin looked up at the bare walls of the old man's house, took out an ordinary durable one from the toolbox and replaced it, not the high-sensitivity one.

After finishing all this, Zixin didn't close the cover immediately.There must be a reason why the rectifier tube exploded, so he followed the clues and quickly found the aging capacitor above it.Most of the TV rectifier tubes use bridge connection, that is, there is a capacitor on each diode, which can not only control the current impact at the moment of starting up, but also bypass high-frequency interference, and improve the performance of the TV to a certain extent. picture quality.

This is easier to solve. Changing capacitors is a routine for Luo Zixin. He quickly finished the work at hand, connected the power, and pressed the switch of the black and white TV. On the screen, Uncle Zhao slapped his thigh and shouted: "Yes, it's here. You said my son did all kinds of new things, and asked me, a father, to find a wife for him..."

The boy closed the cover, turned his head and looked at the happy old lady expectantly: "15 yuan, thank you for your patronage."

"Okay, okay." The old man handed over the money to Luo Zixin, deeply satisfied with the affordable price.

"Thank you for your hard work, kid."

"It's not hard." Zixin packed up his things and hurried out with the toolbox. The dark sky like splashed ink made him a little startled, and there was always a vague feeling of strangeness. He shook his head, trying to dispel the bottom of his heart Feeling uneasy, I told myself to finish all the orders quickly and go home.

Just as Luo Zixin walked to the door, out of the corner of his eye, out of professional habits, he accidentally caught a glimpse of something in the corner, which made him subconsciously stop.

"What's the matter?" The old man who was walking behind and was about to send the boy outside the door asked in a daze.

Zixin stared at the dusty mop board in the corner. The six sockets on it were fully occupied by plugs of various electrical appliances. It seemed that because of the insufficient length, many plugs were half-detached from the sockets. What's more, three of the wires had been bitten open by some rodent, exposing the copper wires inside.

He unconsciously looked up at the sky outside again, the gloomy sky, and the storm was about to come.

The boy's hand holding the toolbox tightened, and the next moment his shoulders relaxed, and he turned around and reopened the toolbox.

"This power strip has a very big safety hazard. If you don't mind, I can help you fix it."

"That, money..." The old man looked embarrassed.

"No cost, no money."

……

"Okay, now you don't have to worry about leakage." Zixin stood up and clapped his hands in satisfaction. The damaged and tangled wires were all repaired by him, and the too short plug-in wires were installed on other circuits in the room. , The power strip that was originally placed on the ground is now placed on a small wooden shelf to avoid moisture.

"Thank you, it looks much more comfortable this way." The old lady didn't know the danger of electric leakage, and she was very happy just looking at the clean wires.

After bidding farewell to the old man, Luo Zixin couldn't help but rush to the next house on the list without stopping.The dense raindrops also fell at this time. He put on the rain cape, wrapped the toolbox, and rushed into the rain.

As time went by, the names on the list were crossed out one by one. When Luo Zixin saw the last destination clearly, his hands and feet trembled, and the bicycle wheels slanted across the wet ground. He quickly adjusted the front of the car, Only then did the person and the car fall to the ground, and there was a burst of crisp laughter ahead. Zixin didn't care to wipe off the cold sweat on his forehead, and looked up, the last guest was standing in front of him, standing in front of him. Under the eaves of the lights, behind the rain, the flowers trembled with laughter.

"Snow, Sister Xue..."

"Hey, come in soon!" The young woman said, and opened the door behind her.

Zixin parked the car and walked in. This is a house that occupies quite a lot of land, and the furnishings inside show that the family's situation is very good.

"Come on, wipe off the water on your face." A pretty middle-aged woman handed Luo Zixin a clean towel.

"Xiaoxin, do you want some water? Are you tired, take a rest."

Zixin took the towel a little flattered, thanked the other party politely, and avoided the suggestion to let him rest: "Aunt Du, what do you want me to fix? There is no explanation on the list."

At this time, Du Feixue, who was waiting outside the door, also walked into the house, ran up to Luo Zixin with a smile on her face, stretched out two fingers to grab one of the boy's cheeks, and gently tugged: "Guess!"

Zixin was helplessly pulled in the face, looking pitiful.

"TV? Radio? . . . "

"No, guess again!"

"Uh……"

"Xue, don't bully Xiaoxin." At this time, a young man's voice came from the stairs, and Du Feixue put down his claws resentfully: "Azhang, you help him again!"

Zixin raised his head when he heard the voice, as if he had met a savior: "Brother-in-law Xue!"

"There's a word called sympathy for the same sick!" Liang Zhang whispered, beckoning to Zixin: "Xiaoxin, come with me."

"What exactly is repairing?"

"Brother, do you know?"

Zixin's eyes lit up, and he replied expectantly: "I've heard of it, but I haven't had the chance to get in touch with it."

"Well," Liang Zhang teased himself with a smile: "I have a big brother here, and I bought it for a total of [-] yuan, and it is also one of my betrothal gifts to Xiaoxue. During the year, I lived in your sister Xue's house to eat and drink to maintain my life."