Guo Yonghe did not shy away and accepted Section Chief Tang's bow calmly.

The special heating liquid and melting liquid used for disassembly were only disclosed in Beigang Group's technical publications in the late 1990s. Without his teaching, Section Chief Tang would have known the secrets at least six or seven years later.

In other words, what he said today means that the disassembly and soldering technology has reached the leading domestic and international levels.

After the integrated block was disassembled, a delicate circuit as dense as a spider web was exposed next to it. Under the guidance of a magnifying glass, Guo Yonghe quickly found the broken fine circuit.

"Expert Guo,"

Section Chief Tang used another magnifying glass to observe the broken circuit, with a confused look on his face:

“The distance between these fine circuits is less than 0.3 mm. No matter it is the most advanced solid solder or liquid solder in China, it is impossible to safely solder at such a small distance.

"I don't know your emergency repair plan, how to deal with this broken circuit?"

Guo Yonghe laughed when he heard the sound and said: "Chief Tang, you have to bow to me again before I can tell you the key."

As soon as he finished speaking, Section Chief Tang bowed to him without hesitation, "Expert Guo, thank you! Please enlighten me!"

Guo Yonghe was originally joking with Section Chief Tang, but he didn't expect that Section Chief Tang would bow so neatly. One can imagine how strong Section Chief Tang's desire for knowledge is!

However, Section Chief Tang's bow will not be in vain. In addition to his safe disassembly skills, he can also learn from himself the emergency repair skills for the delicate circuits of printed circuit boards.

"Director Li, Section Chief Tang, the so-called emergency response. As I said before, the emergency maintenance plan currently adopted is only a temporary measure. It can only ensure the emergency operation of the printed circuit board for a short period of time, and then it must be

Regular precision welding technology must be used to reprocess the broken fine circuit, otherwise over time, the circuit substrate under the broken point may be completely burned."

Guo Yonghe first explained the shortcomings to Li Weijin and Section Chief Tang.

"How long is this short period of time exactly?"

Li Weijin and Section Chief Tang looked at each other and asked quickly.

"Generally speaking, it can run for at least two months without problems."

Guo Yonghe replied: "But to be on the safe side, the time should be shortened by half, preferably no more than one month.

"This is why I told you earlier that if an emergency repair plan is adopted, spare parts for the printed circuit board must be found within a month.

"Of course, if you find a suitable solder flux and a protective film with soldering properties, you can re-solder the broken delicate circuit on the printed circuit board normally."

Li Weijin and Section Chief Tang breathed a long sigh of relief. One month must be enough.

Guo Yonghe previously promised that the normal maintenance plan would be used to repair the printed circuit board again no more than ten days after the emergency maintenance plan. Naturally, there is no need to worry about this aspect.

Section Chief Tang said: "Expert Guo, I understand the time limit, but you haven't explained the specific emergency repair plan and how to solder the broken circuits!"

"hehe,"

Guo Yonghe laughed again, "Actually, the emergency maintenance plan is very simple. I don't need to explain it. You and Director Li can understand it just by watching."

As he spoke, he handed the 6h drawing pencil to Hu Dongqiang and said, "Xiao Hu, sharpen the pencil for me."

Hu Dongqiang took the pencil, picked up the pencil sharpener on the table, and quickly sharpened the pencil until it was sharp and thin.

"Director Li, Section Chief Tang, and Xiao Hu,"

Guo Yonghe took the drawing pencil and shook it at them. "You guys watch, I will start soldering the broken circuits next!"

Li Weijin, Section Chief Tang and Hu Dongqiang were all a little confused.

Shouldn’t we use a micro-soldering machine to solder fine circuits? Shouldn’t we use flux and soft soldering flux?

What to do with a sharpened drawing pencil?

Then I saw Guo Yonghe holding a magnifying glass in his left hand and pointing at the broken magnetic fine circuit. He held a drawing pencil in his right hand and used the tip of the pen to gently draw six or seven times on the broken circuit. As a result, the broken circuit was covered with a jet black pencil line.

The scratches connect.

Li Weijin, Section Chief Tang and Hu Dongqiang could not help but be stunned: they had never thought that there was such a magical operation.

A printed circuit board worth more than 200,000 yuan can be repaired by scratching it twice with a pencil?

"Haha, no need to doubt it!"

Guo Yonghe turned to look at Li Weijin, Section Chief Tang and Hu Dongqiang's stunned expressions, and couldn't help but laugh, "The answer is actually that simple."

"Xiao Hu,"

He pointed at Hu Dongqiang and said, "Go get a meter and test it to see if the circuit is connected."

"Xiao Hu, don't move, I'll do it, I'll do it myself!"

Section Chief Tang stopped Hu Dongqiang and personally took a multimeter to test this fine circuit.

The test results showed that the fine circuit connected with pencil and ink marks was really connected. Both the resistance value and voltage value were completely within the standard value range!

Isn’t this so damn amazing?

Looking at the test values ​​on the multimeter, Section Chief Tang became petrified again.

He originally claimed to be a technical expert, but compared with the young expert Guo in front of him, his so-called maintenance technology and experience were simply on par with the fifth scum!

If he hadn't seen it with his own eyes today, he would never have imagined that with a 6h drawing pencil, a delicate circuit break on a high-precision printed circuit board could be repaired urgently.

"Chief Tang, how are the data?"

Li Weijin didn't understand the circuit parameters on the printed circuit board, so he stretched his neck and kept asking Section Chief Tang.

"Director Li, no problem, no problem at all! The circuit is connected and the test parameters are within the normal range!" Section Chief Tang finally came to his senses from his petrified state and replied to Li Weijin.

"The parameters are normal, which means there is no big problem with this emergency repair plan!"

Guo Yonghe smiled and directed Hu Dongqiang to get a leather tiger and carefully blow off the floating dust on the printed circuit board. Then he took out the quick-drying paint and carefully applied it to the pencil ink mark.

After the quick-drying paint dried, Guo Yonghe asked Section Chief Tang to test the data again. After confirming that there was no problem, he took the printed circuit board to the micro-soldering machine and soldered the module back to the circuit board with rosin-based tin wire.

Then he smiled and said:

"Okay, Director Li and Section Chief Tang, the emergency repair plan for the printed circuit plug-in board has been successfully completed. You can now put the printed circuit plug-in board back on the industrial computer for testing!"
Chapter completed!