It took a while for the radio to return to normal and the music on the tape was broadcast.

"Sweet honey, you smile very sweetly, like a flower blooming in the spring breeze......"

An unknown singer has a pretty good voice.

"That's the problem. It's like this at the beginning of the start, and then it's getting better slowly, and I don't know why......"

As the sister-in-law spoke, his heart suddenly became worried.

He had approached several merchants to fix it.

But these merchants didn't dare to take the job at all, because once it was repaired, they would lose money.

These ancient electronic products are very delicate, maybe a few touches, and one of the routes inside will be broken.

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

Even if there is a factory production, it will not be sold at any price. Antiques, what you want is a "ancient" word, if the modern electronic components are installed on ancient instruments, what is the difference between it and a dog skin plaster?

Anyway, it can be played normally, and the sister-in-law can only make up for it.

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

"That'...... Alas. ”

"You try."

A tone of obvious distrust.

The sister-in-law complained bitterly in his heart, and felt that he was too much.

Although this nephew of mine is awesome, he is a major in "spaceship management", and he can even repair spaceships, but there is a difference of 108,000 miles between repairing spaceships and repairing radios!

The most important thing is that it is impossible for his nephew to lose money if it is repaired!

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

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

Ye Qingqing did not show weakness, and also glared back at her father, and smiled in her heart. In her opinion, this old antique has long been discontinued, and even the design drawings have long been lost, so who else can repair it?

Especially...... The difficulty of dealing with small problems is actually far greater than that of major problems.

brought down his cousin, a "child of someone else's family", he can always breathe a sigh of relief, and it seems to prove that "reading is useless" and that he can read less in the future......

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

It is these uncomplicated things that have withstood the test of time and survived to the present.

The more complex and delicate things are, the easier they are to be damaged, and the 21st century Warwick and Apple smartphones are very few left, and each one that remains can be auctioned at a sky-high price.

Zhang Yuan had never repaired such an old antique before, and this was a new challenge.

In the past, he might have avoided it, but now, there is a wonderful desire to explore in his heart.

Taking a deep breath, my brain began to rac.

He tried to speculate on how the radio would work, based on what he had learned in the past.

Any electronic instrument plays with electrons and magnetic fields, and the essence is much the same. The working principle of the radio is nothing more than the conversion of audio signals through various circuit structures.

"And this radio, just now used tape broadcasting, so the antenna, variable capacitor, and detection circuit basically did not come in handy. The noise that came out at the beginning is unlikely to be something wrong with these parts......"

"Could it be a tape problem?"

Zhang Yuan took out the tape, manually reset it, and re-plugged it back.

"Sweet honey, you're smiling so sweetly......"

This time, it was played from the beginning with no noise in between.

Zhang Yuan changed another cassette tape and pressed the play button.

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

Still no noise.

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

The sister-in-law saw that he was trying again and again, becoming more and more anxious, and hurriedly said: "Only when it is started at the beginning, there will be a commotion, and there will be no more behind." Not really...... Forget it......"

One of his hearts was always pinching, just hoping that his nephew would be able to retreat from the difficulties.

Don't fix it.

Master, don't fix it!

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

Plug it back in, and sure enough, the cooled radio starts yelling again.

"Buzz—buzz!"

The piercing voice made my liver hurt.

It took a while for it to stop.

Zhang Yuan was thoughtful.

The whole process of troubleshooting is somewhat similar to debugging in computer programming. Now that we've figured out how the bug is generated, we just need to find the cause and fix it.

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

Poor contact?

No, poor contact doesn't start yelling, it just stops working intermittently.

"It's not a phenomenon of electric wheat."

Come to think of it, it's likely to be a warm-up issue.

This is an old-fashioned radio that uses vacuum tube technology.

There are two main devices in this near-vacuum, airtight chamber: one called the heating pole, which is located in the center of the tube and emits light as it works; The other is composed of a cathode, a metal gate, and a metal plate.

"If the vacuum tube is not properly warmed up in the circuit, it can cause the voltage of the entire circuit to be disturbed. This part of the misrepresented voltage was mistakenly transmitted to the amplifier circuit at the back, so when there was no electrical signal, the tape recorder yelled. ”

"And finally, when the RF line is fully heated, the vacuum tube voltage has been adjusted, everything is back to normal, and the tape recorder is working normally."

Zhang Yuan clapped his hands, it should be such a reason!

The brother-in-law saw that Zhang Yuan was pacing back and forth, just eating fruit, and 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, and he began to disassemble the vacuum tubes one by one.

He really started to tear it down!

I......

The sister-in-law almost wanted to cry without tears, and trembled all over: "Zhang Yuan, it's really not good, let's go to a professional antique repair shop!" I know a very good master...... It's just that the price is a little higher. ”

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

He changed the order of the vacuum tubes, then screwed them one by one, and waited for the radio to cool.

The sister-in-law's face was flushed, and he couldn't help muttering in his heart: It won't be broken, right? Is there an extra part?

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

"You know what? Even if it's just the radio, do you know its history, it's ......"

Zhang Yuan didn't answer, just pressed the play button.

Click-

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

"Sweet honey, you smile so sweetly......"

Soft singing echoes in the air.