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Placing Printed Circuit Board(PCB) in to the solder
printing machine
The PCB is placed in the rack of the producing
line. This picture shows 1 sheet which has 6pcs of PCB. We can
put in 50 sheets at a time. These PCBs are carried by a
conveyer belt to the solder printing
machine. | |
Printing solder on Printed Circuit Boards
We use smashed globular solder which is
processed into paste form. We print solder on PCBs using a
stencil which has holes according to the position of the
parts. As printing machine has self air conditioning inside,
the control panel, you see in the picture, can keep the
temperature and humidity constant. Therefore we can print
solder in the best conditions. |
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Picking up the parts
Our mounting machines which have 8 nozzles for
loading are specified for making modules. Each nozzle can pick
up 8 different kinds of parts at the same time, and can also
check each part too. You can see a CCD camera(looks like a
light) in the picture. All the parts are watched by this
camera, so a bad part can never be put on the PCB, We can
avoid most problems in manufacture by this
process. | |
Loading the part
As you see, only good parts are loaded on the
PCB quickly and carefully. This picture was taken when we
stopped the machine. |
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Finishing loading the parts
The PCBs which are finished loading parts are
stored in exclusive racks. We think that it is efficient for
separating some processes, because we need to produce many
kinds of products in small quantity. Our subcontractor also
has production line for only small
quantities. | |
Soldering/Air Reflow
We put solder on the PCB by heating. Solder
melts at a certain temperature, but this temperature could be
changed according to the size of PCB, the kind of the part,
and quantity. The temperature of Air Reflow is controlled
differently for each product because high temperature could
cause the damage to the modules. |
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Soldered
The PCBs which have just been soldered could
warp or twist. Therefore they need to be cooled down on the
flat rack. After cooling, these PCBs go to next step. As you
see the black anti-static rack in this picture, we have
perfect anti-static
conditions. | |
Visual Test
We use a visual inspection machine for the
visual test on the product. We can check the existance of the
part, polarity, and name of the part. After this test, we also
do visual inspection with a magnifying glass. In this test,
inspectors check mainly the condition of soldering. By doing
these tests, a inspection mistake can be
prevented. |
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Electric Test/Tester
We test all products by memory module tester.
Our tester was developed in order to test modules in the same
condition as a motherboard not for performing absolute
evaluation of the memory.
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Motherboard Test
We do not have a motherboard test in the
production process. But we always evaluate newly-released
motherboards, and try to adjust our tester accordingly. By
evaluating motherboards day by day, the reliability of the
memory module tester has improved, so we can deal with
compatibility problems quickly. |
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