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

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

An unknown singer has a pretty good voice.

"It's this problem. It's just like this when it starts up, and it's going to get better later. I don't know why..."

As the little uncle talked, he suddenly became nervous.

He had found several businesses and wanted to repair this thing.

But these merchants dare not take on work at all because once the repair is broken, they will have to pay.

These ancient electronic products are very delicate. Maybe a few touches will break a certain route inside.

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

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 applying a piece of dog skin plaster?

Anyway, it can still play normally, so my uncle can only use it while he is alive.

Zhang Yuanyue walked to the radio with a try: "Let me repair it!"

"Then...ah."

"You try it."

It was obviously a tone of distrust.

The little uncle complained in his heart, feeling that he was too proud.

Although my nephew is awesome, he is a professional "spaceship management" and can even repair spacecraft, but the difference between repairing spacecraft and repairing radio is 108,000 miles away!

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

Seeing that Zhang Yuan's hands had touched the radio, his heart was pulled hard!

But for the sake of face, he couldn't say anything, and just looked back at his daughter fiercely.

Ye Qingqing was not showing any weakness, and also stared at her father with a glimpse of her heart, and smiled in her heart. In her opinion, this kind of antique has long been discontinued, and even the design drawings have been lost long ago. Who else can repair them?

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

I can finally breathe a sigh of relief after defeating my cousin, the "other child", and it seems that it can prove that "reading is useless", and I can read less in the future...

At this time, Zhang Yuan had already unscrewed the housing screws of the radio, exposing the electronic structure inside: switches, power supplies, variable capacitors, potentiometers, magnetic rods, etc., which were not too complicated.

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

The more complex and exquisite things are, the easier it is to damage them. In the 21st century, Warwick and Apple smartphones have few remaining, and every one that has been retained can be sold at a sky-high price.

Zhang Yuan has never repaired this old antique, which is a brand new challenge.

If it were in the past, he might have avoided it, but now, he has a wonderful desire to explore with eagerness.

Taking a deep breath, my brain began to move rapidly.

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

Any electronic instrument plays with electrons and magnetic fields, and its essence is similar. The working principle of a radio is nothing more than converting audio signals through various circuit structures.

"And this radio just used tape broadcasting, so the antenna, variable capacitor, and detector circuit were basically useless. The noise emitted at the beginning was unlikely to be an error in these parts..."

“Is it a tape problem?”

Zhang Yuan took out the tape, reset it manually, and stuffed it back.

"Sweet, you smile sweetly..."

This time, the playback starts from scratch, and there is no noise in the middle.

Zhang Yuan changed another tape and pressed the play button.

"I can't finish loving you..."

There is still no noise.

"So, it shouldn't be because of the tape."

The little uncle watched him making attempts again and again, and became more and more anxious, and quickly said, "Only when the start is started, there will be noisy sounds, and there will be no more afterwards. If it really doesn't work... forget it..."

His heart is always gripped, just hoping that his nephew can retreat from difficulties.

Don't fix it.

Master, don't break it!

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

Plug in again, and sure enough, the cooled radio started yelling again.

“Buzz!”

The harsh voice hurts his liver.

It took a while before it stopped.

Zhang Yuan thought about something.

The entire process of troubleshooting errors is a bit similar to debug in computer programming. Now that the way the bug occurs has been determined, you only need to find the cause and solve it.

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

Poor contact?

No, bad contact will not yell at the beginning, but will only stop working intermittently.

"It's not the phenomenon of electric current."

After thinking about it, it is probably a preheating problem.

This old radio uses vacuum tube technology.

There are two main devices in this nearly vacuum enclosed cavity: one is called a heating electrode, located in the center of the electron tube and will emit light when working; the other is composed of a cathode, a metal gate and a metal plate.

"If the vacuum tube does not warm the body according to the rules in the circuit, it will cause the voltage of the entire circuit to be chaotic. This part of the chaotic voltage will be misdirected to the amplifier circuit behind, so when there is no electrical signal, the recorder yells."

"And in the end, when the RF circuit is fully heated up, the vacuum tube voltage has been adjusted, everything returns to normal, and the recorder works normally."

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

When the little uncle saw Zhang Yuan paced back and forth, just eating fruits, he felt that he was in a bad mood: how could a normal repairman walk around?

Ye Qingqing just smirked.

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!

I……

The little uncle was so angry that he was trembling, and his whole body trembled: "Zhang Yuan, it really doesn't work, so he should go to a professional antique repair shop! I know a very powerful master... but the price is a little higher."

Zhang Yuan ignored his deaf ears and devoted himself to his work. He really didn't hear what his uncle was saying.

He changed the arrangement of the vacuum tubes again, then screwed up screws, and waited for the radio to cool down.

The little uncle's face turned red and couldn't help but mutter in his heart: It won't break, right? Is there an extra part?

Even my sister-in-law couldn't stand it anymore: "Look at you being nervous, it's just a radio, why 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.

Click

The radio was like a gentle sheep, preheating obediently and without any noise.

"Sweet, you smile sweetly..."
Chapter completed!