Wandering Spaceship in Deep Space Chapter 9: Reading is useful

　　 It took a while before the radio returned to normal and the music on the tape was broadcast.

　　 "Sweet, you smile so sweetly, as if flowers are blooming in the spring breeze..."

　　 An unknown singer, the voice is pretty nice.

　　"This is the problem. It was like this when it was started at the beginning, but it would be better afterwards. I don’t know why..."

　　 my little uncle was talking, suddenly feeling anxious.

　　 He has looked for several merchants and wanted to repair this thing.

　　 But these merchants dare not take the job at all, because once the repair is broken, they will lose money.

　　 These ancient electronic products are very delicate, maybe a certain route inside will be broken after a few touches.

　　 What's more, various parts of the radio have long been discontinued.

　　 even if it is produced in a factory, it cannot be sold at any price. Antiques require the word "ancient". If modern electronic components are installed on ancient instruments, what is the difference between putting on a dog skin plaster?

　　 Anyway, it can still be played normally, so my brother-in-law can only use it alive.

　　 Zhang Yuan eagerly walked to the radio: "Let me fix it!"

　　 "That...oh."

　　 "Try it."

　　 is obviously a tone of distrust.

　　 My little-uncle groaned in her heart, feeling like she was overwhelmed.

　　 Although my nephew is awesome, what kind of "spaceship management" professional, and even able to repair spacecraft, but there is a huge difference between repairing spacecraft and repairing radio!

　　The most important thing is that if the repair is broken, it is impossible to make your nephew lose money!

　　 Seeing that Zhang Yuan's hands had touched the radio, his heart was cruelly picked up!

　　 But for the sake of face, he couldn't say much, just looked back at his daughter viciously.

　　 Ye Qingqing did not show any weakness, and stared back at her father, smiling in her heart. In her opinion, this kind of antique has long been discontinued, and even the design drawings have long been lost. Who else can repair it?

　　 Especially... the difficulty of dealing with minor problems is far greater than that of major ones.

　　 knocked down my cousin, the "child of someone else's family", he can always breathe out, and it seems to prove that "reading is useless", and I can read a little less in the future...

　　 At this time, Zhang Yuan has unscrewed the screws of the radio's shell, exposing the electronic structure inside: switches, power supplies, variable capacitors, potentiometers, magnets, etc. The structures are not too complicated.

　　 is these uncomplicated things that have withstood the test of time and survived until now.

　　The more complex and exquisite things are, the easier it is to damage. The 21st century Warwick and Apple smartphones have few remaining, and every one that remains can be sold at sky-high prices.

　　 Zhang Yuan has never repaired such an old antique. This is a new challenge.

　　If it were in the past, he might avoid it, but now, instead, he has a wonderful desire to explore in his heart.

　　 took a deep breath, and the brain started to spin.

　　 He tried to use the knowledge he had learned in the past to speculate on how this radio works.

　　Any electronic device plays with electrons and magnetic fields, which are essentially the same. The working principle of the radio is nothing more than converting the audio signal through various circuit structures.

　　"And this radio just used tape to broadcast, so the antenna, variable capacitor, and detection circuit are basically of no use. The noise at the beginning is unlikely to be an error in these parts..."

　　"Could it be a tape issue?"

　　 Zhang Yuan took out the tape, reset it manually, and put it back in again.

　　 "Sweet, you smile very sweetly..."

　　 This time, I played it from the beginning, and there was no noise in the middle.

　　 Zhang Yuan changed another tape and pressed the play button.

　　 "I can't end my love for you..."

　　 There is still no noise.

　　"So, it should not be because of the tape."

　　 My sister-in-law watched him trying again and again, getting more and more anxious, and quickly said: "Only when the start-up starts, there will be noisy noises, but there will be no more noise behind. It really doesn't work... Just forget it... …"

　　 His heart is always tugging, just hoping that his nephew can get out of trouble.

　　Don't fix it.

　　Master, don’t fix it!

　　 "Is it only at the beginning?" Zhang Yuan waited for a while, then took the radio under the air conditioner and blew it for ten minutes.

　　 plugged it back in, and sure enough, the cooled radio began to yell again.

　　 "Buzz-buzz!"

　　The harsh voice makes the liver hurt.

　　 It took a while before it stopped.

　　 Zhang Yuan thoughtfully.

　　 The whole process of troubleshooting is a bit similar to debugging in computer programming. Now that the method of generating the bug has been determined, it is only necessary to find the cause and solve it.

　　 Zhang Yuan paced back and forth in the room, thinking quickly about the suspicious points.

　　Poor contact?

　　No, poor contact will not yell at first, but will only stop working intermittently.

　　"It's not a phenomenon of electric microphones either."

　　 After thinking about it, it’s probably a preheating problem.

　　This old radio uses vacuum tube technology.

　　 There are two main devices in this close-to-vacuum closed cavity: one is called a heating electrode, which is located in the center of the electron tube and emits light when it is working; the other is composed of a cathode, a metal grid and a metal plate.

　　"If the vacuum tube is not properly warmed up in the circuit, it will cause the voltage of the entire circuit to be disordered. This part of the disordered voltage ~IndoMTL.com~ is mistakenly transmitted to the amplifier circuit behind, so when there is no electrical signal, The recorder yelled."

　　"In the end, when the radio frequency line heats up, the voltage of the vacuum tube has been adjusted, everything returns to normal, and the tape recorder works normally."

　　 Zhang Yuan clapped his hands, this should be the reason!

　　 My uncle saw Zhang Yuan pacing back and forth, just eating fruits, he felt that he was in a bad mood: Where would a normal repairman walk around?

　　 Ye Qingqing just pursed her lips and snickered.

　　 Zhang Yuan lowered his head and squinted his eyes. He began to disassemble the vacuum tubes one by one.

　　 He really started to tear it down!

　　我……

　　 The little uncle was crying without tears, and she trembled: "Zhang Yuan, it's really not good, let's go to a professional antique repair shop! I know a very good master...but the price is a bit higher."

　　 Zhang Yuan turned a deaf ear to his work and devoted himself wholeheartedly to his work. He really didn't hear what the little uncle was saying.

　　 He changed the order of the vacuum tubes again, then screwed on the screws one by one, and waited for the radio to cool down.

　　 My little-in-law's face flushed, and she couldn't help muttering in her heart: It won't be broken, will it? Is there an extra part?

　　 Even my sister-in-law can't stand it anymore: "See you are nervous, it's just a radio, what are you doing?"

　　"What do you know? Even if it's just a radio, do you know its history? It's very..."

　　 Zhang Yuan did not answer, but just pressed the play button.

　　 嚓——

　　 The radio is like a docile sheep, warming up obediently, and there is no more noise.

　　 "Sweet, you smile very sweetly......"

　　The soft song echoed in the air.