Zhou Jianhua quickly signed a contract with Section Chief Chen, which stipulated that the injection molding machine would be loaded and shipped on the same day, and 9,000 yuan would be paid first, and 5,200 yuan would be paid within five days after the installation and commissioning of the injection molding machine arrived, and the remaining 4,000 yuan would be paid two months later as the equipment quality deposit.

Zhou Jianhua then looked at the fault maintenance records of the injection molding machine that Section Chief Chen asked him to obtain from the supply and marketing department, a total of more than 20 fault feedback and maintenance records, which are mainly problems in the circuit part, and without exception are caused by the failure of the same transistor.

Zhou Jianhua had a number in his heart, so he called Zuo Xinmin, director of the "Equipment Finance Department" of the Xinchun City Public Security Bureau, in the machine tool factory, and asked him to remit the remaining 9,000 yuan of equipment money to the account of Nandu Machine Tool Factory. Then he called his "Mechanical and Electrical Equipment Service Department" and asked Liu Lanlan to inform Zhong Min, Min Guibao and others to prepare to pick up the car.

After all this, it was lunch time.

Because Zhou Jianhua was in a hurry, he politely declined Section Chief Chen's lunch reception.

Before leaving, Zhou Jianhua made an appointment with Section Chief Chen to load the injection molding machine in the afternoon, and let the truck wait for him in front of the store department of Jiangnan Electronic Equipment Trade Service Company in the east section of Yangyue Road at about 5 o'clock in the afternoon. Zhou Jianhua also told Section Chief Chen that he would bring him the 10 "circuit board plug-ins" he had made next Tuesday or Wednesday for emergency relief. After saying this, Zhou Jianhua hurriedly left Nandu Machine Tool Factory, bought some snacks in the roadside store, and rushed to Yangyue Road by tram while eating.

Zhou Jianhua needs to purchase a lot of components, including the base station communication system, the daily electronic products needed to earn foreign exchange, and the preparation for improving the circuit of the injection molding machine.

However, Zhou Jianhua only designed the circuit details of the "base station communication system", but he did not have time to design the daily electronic products for export. As for the question of the injection molding machine. It's just that the problem point of the fault is more difficult to find. Once you find the problem, it will be easier to solve.

Although Zhou Jianhua has not had time to carefully compare and analyze the fault of the injection molding machine and the circuit diagram, he judged from experience that there is no need for any "circuit board plug-in", and I am afraid that only some conventional electronic components will be used to make a simple electronic assembly, or even as simple as a copper wire can solve the problem.

However, Zhou Jianhua has already thought about it, in order to prevent Nandu Machine Tool Factory from cracking his own solution. He had to make at least a small circuit board decently, and the circuit board should be densely packed with multiple components to make a very complex circuit look like a very complex circuit to confuse the other party.

Of course, Zhou Jianhua also has to make a special structural design with a "self-destruct" function for the key parts of this circuit board, so as not to let someone unruly disassemble a set of "circuit board plug-ins", find their own secrets and imitate them, and then they only need to pay for a set of "circuit board plug-ins", and return the rest of the "circuit board plug-ins" to themselves. Regarding this structure with a "self-destruct" function, there can be many designs. Zhou Jianhua already had a preliminary plan in his heart at this time.

Zhou Jianhua's itinerary plan for the past few days has changed again and again.

Zhou Jianhua originally planned to hold a technical meeting at the Nandu Machine Pump Factory during the day yesterday and today. In the evening, the base station communication system and the circuit diagram of daily electronic products were designed in the guest house of their factory, and then tomorrow I spent a whole day slowly looking for components in these two aspects on Yang Yue Road and returned to Jiancheng, but I didn't expect that it only took half a day to end the meeting yesterday.

When the general manager of "Jiangdian Trade" Wang readily agreed to give himself the three existing components of the company today, Zhou Jianhua planned to take a look at the injection molding machine of Nandu Machine Tool Factory next, and then immediately went to buy the last bus ticket to return to Jiancheng this evening, and then in the afternoon after purchasing the domestic components required for the "base station communication equipment", and then rushed back with these imported components, so that his "mechanical and electrical equipment service department" could operate as soon as possible. It is too hard to turn the car back and forth with auxiliary materials.

Unexpectedly, after I went to Nandu Machine Tool Factory, I had a temporary idea and decided to start infiltrating the equipment manufacturing industry now. As long as you buy an injection molding machine today, you can immediately test the "circuit board plug-in" you designed on this equipment, and then copy a dozen or so pieces to bring to Nandu Machine Tool Factory when you return to Nandu next week, which is a good opportunity to intervene in the equipment manufacturing industry. So, today, I can comfortably make a free direct bus full of electronic components and machinery and equipment back to Sword City to reunite with my family and friends.

As soon as Zhou Jianhua arrived at Yangyue Road, he kept looking for all kinds of components he needed in the electrical component sales department. Zhou Jianhua took the circuit diagram just designed last night and kept looking for more than four hours, seeing that it was almost five o'clock, he finally purchased most of the domestic components needed in the "base station communication system", and the rest had to wait for the next time to come and procure.

Zhou Jianhua seized the time to buy a lot of commonly used and cheap ordinary resistors, capacitors, diodes, transistors and copper clad laminates, as well as solder, rosin, sulfuric acid, sandpaper and other accessories, so he hurriedly carried those large bags and small bags of components and materials to the "Jiangdian Trade" store department, a truck with "Nandu Machine Tool Factory" printed on the door had already stopped on the side of the road outside the "Jiangdian Trade" store department.

Zhou Jianhua walked directly to the cab of the truck and greeted the driver, and piled up all the big bags and small bags with the driver, and then turned around and entered the "Jiangdian Trade" store to pick up the imported components prepared by "Jiangdian Trade" for himself.

Seeing Zhou Jianhua enter the store, Wang Xiaoling immediately stood up from the desk in the counter, greeted the counter with a smile and said, "Why did you come here so late?" I thought you wouldn't be here today! ”

"How could it not come?!" Zhou Jianhua responded with a smile as he stepped forward:

"I finally got your company leaders to agree to give me all your inventory, if you don't come, wouldn't it be a toss? Hehe......"

"Well, I knew you could handle it!" Wang Xiaoling said with a smile: "How is it?" Are you done with today? ”

"It's only done for the time being! I was tired of standing for an afternoon, walking back and forth to these shops! Zhou Jianhua said with a tired face:

"Where are the components that your company prepared for me? Give it to me, the car is waiting outside. ”

"Huh?! Is that car waiting for you outside?! Wang Xiaoling's face immediately became disappointed:

"I thought you weren't going back today......

"Hehe, time is pressing! I have to rush back, and I'm waiting to use these things in Sword City! Zhou Jianhua said with a wry smile:

"Alas! I haven't finished buying it after an afternoon......"

"What's the matter...... Anyway, you're going to come next week, so I'll take the time to buy it then! Wang Xiaoling said while hugging several large cardboard boxes stacked on the counter to the counter.

"Huh?! How do you know I'm coming next week? Zhou Jianhua asked strangely:

"That's right! You said you knew I would be here in the morning, but you haven't told me how you know! ”

Wang Xiaoling's big watery eyes suddenly stared at Zhou Jianhua slyly, and asked with a mysterious smile:

"Hee-hee...... Do you really want to know? ”

"What's really fake...... Since I asked, of course I want to know! Zhou Jianhua glanced at Wang Xiaoling weakly and replied.

Wang Xiaoling glanced at Zhou Jianhua with slanted eyes, pursed her lips, and asked with a reluctant look: "Then...... Why should I tell you? ”

Zhou Jianhua was really strange how Wang Xiaoling knew his whereabouts, and seeing Wang Xiaoling's threatening look, he had to ask helplessly:

"Say it! How can you tell me? ”

Wang Xiaoling thought about it, pursed her lips and smiled: "It's better to wait for you to come next time, and I'll tell you again!" ”

"Why wait so long? Now that's it! Zhou Jianhua said tangledly.

"Humph! Now to tell you, I don't have much good...... Let's talk about it later! Wang Xiaoling pouted and said:

"You'd better hurry up and get these treasures of yours into the car!"

"Uh...... So what do you want to tell me? Zhou Jianhua asked unwillingly.

Wang Xiaoling sighed lightly and said, "You can't give it if I say it, let's do it next time!" ”

After Wang Xiaoling finished speaking, she turned around and took a list from the desk and handed it to Zhou Jianhua: "This is the list of quantities in the box, do you want to check it?" ”

Zhou Jianhua opened several cartons in turn, glanced at them briefly, and asked, "Have you carefully checked the model of each component here?" ”

"I've done that, but you'd better do it again." Wang Xiaoling replied.

"You're right! I trust your arithmetic abilities. Hehe......" Zhou Jianhua said with a smile, and said in his heart, if you want to check the models marked on these components one by one, it will take more than ten minutes, so don't let the driver wait.

Wang Xiaoling turned around and walked out of the counter, helped Zhou Jianhua carry those cartons to the back of the truck, Zhou Jianhua put the cartons and was just about to get into the car, suddenly remembered the question just now, and asked with a smile:

"Tell me how the hell do you know? ――Tell me what you want, and I'll bring it to you next time. ”

"Hee-hee...... You'll find out later! Wang Xiaoling replied with a smile: "You hurry up!" When you get to Sword City, it's dark! ”

Zhou Jianhua reluctantly got into the car, waved at Wang Xiaoling, and the old truck roared and started, slowly starting with heavy equipment, and gradually drove away from Wang Xiaoling's sight.

Wang Xiaoling walked back to the store, walked through the counter door, pushed the door directly into the room, picked up the phone and dialed, and a woman's voice came from the phone: "Hey? ”

Wang Xiaoling said faintly: "Mom, I'm not going out for dinner today, you better cook more......" (To be continued......