The owner of the hot pot restaurant, Lao Zhang, was so anxious that he jumped up - the ordering screen that spent 80,000 yuan was suddenly dark, and the repairman opened the back cover and patted his thigh: "The control is stuck on the edge of the exhaust duct, and the motherboard is baked! "Where should this thing be put? Let’s talk about this technical job that has caused countless novices to fall into trouble today.

The control card is not plugged casually

Last month, I made a joke when I helped the Internet cafe install e-sports screen. The small worker sticks the control card to the screen bracket to save trouble, and as a result, the signal is interrupted and interrupted when the player is operating fiercely. Later, it was changed to fixing cement load-bearing walls, and the failure rate immediately dropped by 90%.

​​Three major iron rules for installation location​​：

1. ​​Stay away from heat sources​ ​: At least 1.5 meters away from the air conditioner outlet, kitchen equipment must be avoided 3 meters away
2. ​​Shockproof and anti-shake​ ​: Don't install it on glass curtain walls or thin iron walls
3. ​​Easy to repair​ ​: Don't let the ceiling or decorative board wrap the control card into rice dumplings

There is a typical case of a shopping mall atrium screen. They hid the control card behind the decorative green plants, but the water mist seeped in when watering, and there was a problem every few days. Later, it moved to the maintenance well and installed moisture-proof boxes before it stopped.

The layout of the line hides great questions

Lao Li of the decoration team took over an urgent order - the price tag screen in the supermarket's fresh food area is flashing. After searching, I found that the power cord of the control card and the refrigerator were connected in conjunction with the power supply, and the electromagnetic interference caused the signal to run wild.

​​Wiring pit avoidance guide​​：

• ​​Strong and weak electric separation​ ​: The signal cable should be separated by more than 20cm from the 220V power cable
• ​​Reserved margin​ ​: Leave an additional meter of length in the network cable to prevent thermal expansion, cold shrinkage and tear
• ​​Mark clearly​ ​: Label the lines in different partitions, don't believe in your memory

The most amazing solution I have ever seen is the job in the hotel banquet hall. They installed a rotary cable processor at the control card outlet, which was as smooth as a headphone cable when changing modules, and the maintenance time was shortened by three-quarters.

The cooling solution determines the lifespan

Boss Wang, who sells accessories in Electronic City, revealed a secret: the control card of the same model can have a lifespan of three years when installed in an iron box and an aluminum box. The control card in the shower area of ​​a gym has been replaced three times in half a year because it is not moisture-proof.

​​Three-piece heat dissipation and moisture-proof set​​：

1. Metal shell + heat dissipation fins (cooling 8-12℃)
2. Silicone sealing ring (moisture resistance level is increased by 2 levels)
3. Temperature control fan (automatically start at 40℃)

There is a cinema that is worth learning: a thermometer is installed in the control card cabin, connected to the alarm in the management room. If the setting value exceeds the setting value, it will sound, which is much more reliable than regular inspections.

Hidden levels for signal transmission

The wedding company suffered a heavy loss - the mobile screen used for outdoor weddings suddenly got framed. Later, it was discovered that the distance between the control card and the receiving card was more than 120 meters, and the signal attenuation was so bad that my mother didn't recognize it.

​​Transmission distance comparison table​​：

There is a new trick in an exhibition hall: hide the control card in the column and save the power cord through PoE power supply technology. It is both beautiful and safe, and also saves 30% of the wiring cost.

I figured out these tricks, and next time I saw the installer stuff the control card into the corners and took out his phone and showed him this article. Remember one hard truth: choose the control card position well, and run less errands in the later maintenance. Those who are willing to leave maintenance ports in the control cabin and perform independent heat dissipation will be absolutely cost-effective to spend 2,000 yuan on the installation fee. By the way, the control cards of high-end points now have remote restart functions, and the problem can be solved by just a little bit on your phone. Sooner or later, this technology will become standard!

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