The general method of injection molding machine circuit board for repair

Date：2014/11/20 11:27:39

Method One: look after the amount

Tools: multimeter, magnifying glass

When the vertical injection molding machine circuit board holding the piece to be repaired, the good habits first, and should be visually, if necessary, even with a magnifying glass to see it?

Mainly to see:

1, vertical injection molding machine circuit board if there is broken;

2, discrete components such as resistors, electrolytic capacitors, inductors, diodes, transistors and other time off phenomenon exists;

3, PCB vertical injection molding machine circuit board connecting line if there are broken, adhesions;

4, vertical injection molding machine circuit board if anyone repaired? Which components moving too? Whether there Weld, weld, and other operational aspects of the anti-plug failure;

In determining the repair parts are no such conditions, the first measurement of the resistance of vertical injection molding machine circuit board power and ground with a multimeter, if the resistance is too small, only a few or a dozen ohms, indicating vertical injection molding machine circuit board components breakdown or partial breakdown, we must take measures to find out the breakdown of the components. Specific measures are to be revised circuit board power supply, vertical injection molding machine circuit board to touch each device temperature by hand, will be the focus of a hot suspect. If the resistance is normal, measured with a multimeter board resistance, diodes, transistors, FET, dial switches and other discrete components segment, its purpose is to ensure that measured the first element is normal, we reasoned that use a multimeter solve the problem, do not make it complicated.

Method two: first the outer and inner post

Use tools: line maintenance circuit tester

If circumstances permit, it is best to find a repair plate with the plate as good as a reference, then use double stick together VI curve scanning function of two plates were good, bad comparison test, the starting point of comparison can be started from the port and then outside to the inside, especially capacitance comparison test, you can make online multimeter difficult to detect whether the leakage defect.

Method three: the easier issues first

Use tools: line maintenance circuit tester, electric iron, marker

To improve the test results before for vertical injection machine circuit board circuit and functional testing, repair panels are made to deal with some of the technical treatment to try to weaken the negative impact of various disturbances caused by the test process. Specific measures are:

1, the test preparation before

The crystal short for large electrolytic capacitors to be welded under a foot to make it open, because the capacitor charging and discharging can also cause interference.

2, using the device to be tested exclusion

For vertical injection molding machine circuit board devices online test or comparison process, all test passed (or more normal) of the device, please confirm the test results in order to record; do not pass the test (or comparative tolerance) can be test again, if still not passed, but also the first confirmed test results, and thus has been testing continues, device testing until the board (or comparison) finish, and then come back to deal with those who have not passed the test (or comparison tolerance) devices. Did not pass the test on the function of the device online, the instrument also provides a less formal but more practical approach, since the instrument powered vertical injection molding machine circuit board test clips can be applied to the device through the appropriate power and ground pins If the implementation of the supply pins cutting edge of the device, then the device is removed from the vertical injection molding machine circuit board power supply system, the next time the device circuit and functional testing, as other devices vertical injection molding machine circuit board will not renewed interference, actual test results equivalent to the "quasi-offline", measuring quasi rate will be greatly improved.

3, with the ASA-VI curve scan testing for device testing library is not covered by comparing test

Because ASA-VI Smart curve scanning technology can be applied to any device comparison test, as long as the device can test clip grip, then there is a reference to the board, by comparing the test, the device also has strong fault detection capabilities. This feature makes up the device to be constrained by lack of functional test online test library, expanding the instrument to the vertical injection molding machine circuit board fault detection range. In reality often appear unable to find a good board to do the reference scenario, and the circuit board itself to be repaired without any symmetry structure, in this case, ASA-VI curve scan comparison test function no effect, and line functional testing due to incomplete device testing library, unable to complete the vertical injection molding machine circuit boards are tested each device again, vertical injection molding machine circuit board still can not fix, here is the circuit line maintenance instrument limitations, just as there is no cure hundred disease drug same.

Method four: After the first static dynamic

Since the vertical injection molding machine circuit board circuit line maintenance instrument currently only for vertical injection molding machine circuit board devices were functional analysis and online testing of static characteristics, is fully repaired must go through the whole test inspection, therefore, in the examination of the most well first check the power supply is required to properly supplied to the vertical injection molding machine circuit board.

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