Reading is still useful

It took a while for the radio to return to normal and play the music from the tape.

"Sweet honey, you smile so sweetly, like flowers blooming in the spring breeze..."

An unknown singer has a beautiful voice.

"That's the problem. It's just like when I started it from the beginning, and then it gradually healed. I don't know why..."

As the little uncle spoke, he suddenly felt uneasy in his heart.

He once contacted several merchants to repair this thing.

But these merchants dare not take on the job at all, because if they fix it, they will have to pay for it.

These ancient electronic products are so delicate that if you touch them a few times, a certain route inside may break.

Moreover, various components of the radio have long been discontinued.

Even if there is a factory for production, it cannot be sold at any price. Antiques and antiques require the word 'ancient'. If modern electronic components are installed on ancient instruments, what is the difference between it and sticking a dog skin ointment?

Anyway, it can still be played normally, so my uncle can only make do with it.

Zhang Yuan approached the radio eagerly and said, "Let me fix it."

"So... alas."

"Give it a try."

There was an obvious tone of distrust.

The little uncle couldn't help but moan in his heart, feeling that he was feeling overwhelmed.

Although my nephew is amazing and specialized in "spaceship management", he can even repair spaceships, but repairing spaceships and repairing radios is a thousand miles away!

The most crucial thing is that even if it's repaired, it's impossible for your nephew to lose money!

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

But due to face saving, he couldn't say anything more, just turned around and gave his daughter a fierce look.

Ye Qingqing showed no weakness and glared back at her father with a smile in her heart. In her opinion, this old antique has long been discontinued, and even the design drawings have been lost. Who else can repair it?

Especially... the difficulty of handling small problems is actually much greater than that of major problems.

Pulling down my cousin, who is the 'child of someone else's family', can always breathe a sigh of relief, and it seems to prove that 'reading is useless' and that in the future, I can read fewer books

At this time, Zhang Yuan has already unscrewed the screws of the radio housing, exposing the electronic structures inside: switches, power supplies, variable capacitors, potentiometer, magnetic rods, etc., which are not too complicated.

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

The more complex and exquisite things are, the easier they are to be damaged. The Huawei and Apple smartphones of the 21st century have very few remaining ones, and each one can be sold at a skyrocketing price.

Zhang Yuan has never repaired such old antiques, and this is a brand new challenge.

If it had been in the past, he might have avoided it, but now he has a curious desire to explore in his heart.

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

He attempted to infer the working mode of this radio based on his previous knowledge.

Any electronic instrument, playing with electrons and magnetic fields, is essentially the same. The working principle of a radio is nothing more than converting audio signals through various circuit structures.

"And this radio, which was just broadcasted on magnetic tape, has basically not been used for antennas, variable capacitors, and detection circuits. The initial noise emitted is unlikely to be due to errors in these parts."

"Can it be a tape problem?"

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

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

This time, starting from scratch, there was no noise in the middle.

Zhang Yuan changed another tape and pressed the play button.

"I love you endlessly..."

There is still no noise.

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

The little uncle watched as he was trying again and again, becoming increasingly anxious. He quickly said, "Only when there is a loud noise at the beginning of the startup, there is no noise behind it. It's really not possible... let's just forget it."

His heart was always clenched, just hoping that his nephew could overcome difficulties and retreat.

Don't fix it.

Master, don't fix it!

"Will it only be like this from the beginning? "Zhang Yuan waited for a while and then took the radio under the air conditioner to blow for ten minutes.

Plug in the power again, and sure enough, the cooled radio starts roaring again.

Buzz - Buzz

The piercing voice made my liver ache.

It took a while for it to stop.

Zhang Yuanruo has some thoughts.

The entire process of troubleshooting errors is somewhat similar to debugging in computer programming. Now that the cause of the bug has been determined, we just 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, poor contact does not initially cause yelling, but only intermittently stops working.

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

After much thought, it is likely a preheating problem.

This old-fashioned radio uses vacuum tube technology.

There are two main devices inside this nearly vacuum sealed chamber: one is called a heating electrode, located in the center of the electron tube and emitting light during operation; The other is composed of a cathode, a metal gate, and a metal plate.

"If the vacuum electronic tube warms up irregularly in the circuit, it will cause voltage disorder throughout the entire circuit. This disordered voltage is mistakenly transmitted to the amplifier circuit behind it, so when there is no electrical signal, the recorder roars loudly."

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

Zhang Yuan clapped his hands, that's probably the reason!

The little uncle saw Zhang Yuan pacing back and forth, just munching on the fruit. He felt like he was in a bad mood: a normal repairman wouldn't be walking around.

Ye Qingqing just pursed her lips and chuckled.

Zhang Yuan lowered his head and squinted his eyes as he began to dismantle the vacuum tubes one by one.

He really started dismantling!

The little uncle was almost tearless and trembled all over: "Zhang Yuan, it's really not good. Let's go to a professional antique repair shop! I know a very skilled craftsman... but the price is a bit high."

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

He rearranged the arrangement of the vacuum tubes and then tightened the screws one by one, waiting for the radio to cool down.

The sister-in-law blushed and couldn't help but mutter to herself, 'Isn't it going bad?'? Is there an extra part?

Even my sister-in-law couldn't bear to watch anymore: "You're so nervous. It's just a radio, why

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

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

Click——

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

Sweet honey, you smile so sweetly

The soft and beautiful singing echoed in the air.