Have you also fallen into these "old hand traps"? Operating Taboos for Samsung Surface Mount Technology (SMT) Machines!

This trick is really the one that veterans are most likely to commit. For the sake of speed and convenience, as soon as one board was placed down, the next one was immediately put on to continue pasting.

Where is the problem?

• The size and coordinates of the board have not been updated.
• The camera's recognition points still remain at the parameters of the previous block.
• Some suction nozzles haven't returned to their original positions yet, and as a result, the first component is misaligned!

Although Samsung surface mount technology (SMT) machines have stable performance, it is highly not recommended to start working directly without initialization or resetting to zero.

Samsung's visual system is very powerful, with fast recognition and accurate algorithms, but it's not a deity.

Sometimes, just because a machine can see something doesn't mean it can stick accurately.

Especially in the following situations, if the visual parameters are not readjusted, the entire board may be misaligned

• Replaced the material tray (with minor adjustments to the component size);
• The MARK point is black and has stains.
• The nozzle specification was changed, but the system was not updated synchronously.

Once there is a deviation in visual recognition, the consequences are more serious than you can imagine. If it deviates by 0.1mm, you won't notice it with your naked eye, but once heated during welding, it will all deviate!

This is really an "old hand problem". Sometimes the suction nozzle can't hold it, so I just manually shake it or plug and unplug it, and then continue to use the machine.

You may not know that this action directly ruins the health of the "vacuum system" of the surface mount technology (SMT) machine.

If the suction nozzle fails to stick, it is most likely due to the following issues:

• The suction force of the vacuum pump is insufficient (the filter element is clogged).
• The head of the suction nozzle is dirty (residual glue or dust);
• The negative pressure detection alarm was triggered but you skipped it!

The result? Either they can't be attached, or they lose material, or they are attached crooked. The most fatal thing is that some small capacitors fly out and even make a hole in the board!

One advantage of Samsung's surface mount technology (SMT) placement machines is their high precision, featuring flight recognition and visual correction. Theoretically, they can achieve ±0.03mm.

But this doesn't mean you can just "turn a blind eye".

Many experienced operators, upon seeing a slight deviation, would say, "A little bit off is not a big deal. As long as it can be welded on, that's fine."

Here comes the question:

• This kind of "fine" error, once it enters reflow soldering, is very likely to deform or shift.
• Especially for high-density BGA boards and QFN packaged products, even if they deviate by 0.05mm, short circuits or false soldering may occur.

It's true that the program of the Samsung surface mount technology (SMT) machine can be copied, which is also a major advantage of its convenient operation.

But some people just copy the program and "start Posting directly" without doing any dry running verification at all. This is simply outrageous!

Don't forget

• Even if the positions of components on the PCB differ by 0.1mm, the mounting program will be inaccurate.
• If you change the nozzle model, feeding method or PCB thickness, the original program may not be applicable!

Samsung machines are indeed sturdy, but they can't be used like "triathletes" every day.

Some experienced operators always say, "If the machine is running normally, there's no need to touch it."

Result: One day, the suction nozzle suddenly stopped sucking, vision began to wander, and the transmission board got stuck... It's all due to inadequate daily maintenance.