Dongguan Junrensi Electronic Technology Co., Ltd.

QFP how should it be maintained?


FAQ
Four side pin flat package (QFP) of the pin is often bent, the most common is 28mm and larger size of the parts.
Repairs
Pick a light hand and a light touch approach prudent operator training.
Of toe adjustment and coplanarity check is useful. During operation, a technician should further minimize the bending pin. However, in some cases, may have to deal with another to a foot off the foot. Should avoid further bent to allow survival at high fatigue environments.
The simplest way
First, find a suction-line (or some of the cable shield), this line of folding it, fold out the midline no glitches, just use. Use tweezers to pick up the head of the line, with rosin infiltration midline, then tin, wire saturated with it. When soldering the chip, the first chip of a good location, with a soldering iron will to fix the chip on the fillet, then tweezers from suction-line, with a soldering iron on a head above a tin and tin After thawing, the lines are tin affix a head pin, the pin along the direction of what plan that can cover the wire solder pin part is good, you can turn on all the pins welding. Finally, you can use alcohol wipe rosin on the board.
When removing the chip, as above, except that the suction-line infiltration can only rosin, no suction tin. Slide the same way again, most of the tin can be sucking. Then, find a thin wire (usually from the partnership in the power cord unplugged, copper ineffective), the gap between the pin and chip package through, exposing the ends of the pins are bent along the direction of ninety degrees, and then, in one hand and a soldering iron, wire of any one end in one hand, with the iron close to the pin, while the sliding direction perpendicular to the pin while pulling the wire, the same as with a line cutter, you can quickly chip solder next. Just make sure the temperature is not too high iron (such as 300 degrees), stop at a certain time the chip is not too long (less than 5 seconds), removed the chip can be reused.
Specific operations
Fong package (QFP, quad flat pack) of the pin is often bent, the most common being 28-mm and larger physical size of the parts. High-quality metal packaging and inertia seems inclined to make some form of damage QFP, especially if the matrix is subjected to any form of shock pallet. The result is a bungled plan, assemble low pass rate, and make customers unhappy. The parts back to the original place or out of repair, it takes valuable time to go. However, you can use your own method of repair, often, the parts can reject it back to the beginning of the placement machine.
QFP repair choice
Available equipped with a camera and a mechanical tactile machine, the component pin processing to meet the JEDEC standard, but its price may be a limitation. They also have to provide such services, but the cost is still a problem.
Within the factory, use tweezers to probe and repair parts may be a relatively simple method. Repair tools should also include a template, it is pin pad geometry etched on the surface of the sheet. These templates help deal with the pin and as the last "line / no" standard. Vacuum helps draw pen parts processing, complete repair tools also need a laboratory flat granite surfaces AA level.
QFP repair operations
Should choose a light hand and a light touch approach prudent operator training. Before repairs, determine whether the components may be saved. Not all can be saved, the pin may bend too serious, so just put it bent back position will be broken. These operations should be carried out at an ESD workstation, proper lighting and magnifying glass. There are three to four refractive lens illuminated magnifying glass on it.
The operator should
The selection of an appropriate template, and paste it on board the plane. In the template and a flat plate should have enough space to handle QFP, so there may be an offset. Element into the adjustment template.
Then, technicians choose various tools from the rough alignment to be more fine-tuning. Normal operation may require tweezers to pull out the bending and twisting of the pin to adjust the toe and heel, flat foot bar and coplanarity adjustments.
The template is the pinout to the proper pitch good device. Pins in their respective cavity, removable knee in place without moving the rest of the pins. Templates are the best tool for a final check spacing. Flat plate, only 0.00002 "uneven surface error, the adjustment of the toe and coplanarity check is useful.
During operation, a technician should further minimize the bending pin. However, in some cases, may have to deal with another to a foot off the foot. Should avoid further bending, to allow a high fatigue ring.
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