Advice 1: How to check the capacitor, not Vipava

The use of multilayer printed circuit boards, reduction of the tracks, contact pads leads to the fact that it becomes harder to use the items for replacement. There are several ways to verify that the capacitors directly on the Board.
The faulty capacitor

The complexity of the test capacitor



When measuring the capacitance of the capacitor on the Board without preliminary dismantling problems. The capacitor is always included in the circuit and can coexist on the PCB with other circuit elements. Particularly affect the capacitance of the transformer windings, inductor, fuses - they have a small DC resistance.

Therefore, you must ensure that the circuits of the measured capacitor is no influence of such elements. If circuits with capacitor included a transistor or diode, then when measuring it is possible to see the deflection to a certain position and drop to a certain value equal to the resistance of the transitions of the semiconductor. And if there is no short circuit, the capacitor may be defective.

Check capacitor with multimeter



When you touch the probes of the multimeter to the capacitor is supplied a constant current from the tester. The capacitor will charge, and the resistance gradually increase.

On the electronic tester value will grow from negative or positive values to one indicating a resistance that exceeds the measuring range selected by the shift knob. After permutation of the probes of the tester places the capacitor must be recharged, the device needs to act as well.

On the deflection dial of the multimeter by connecting a capacitor and return it to its original position can be seen in a scale the maximum deviation.

If you swap the probes, the meter pointer must deflect to maximum and gradually fall to their original position. After the need to take similar and known-good capacitor and if the pointer of the tester on the control element is deflected more, check the condenser outside.

If the measurement and compliance of the pros and cons on the tester and terminals of the capacitors the instrument will show the resistance, then the condenser is faulty.

Check condenser other devices



There are devices which you can check the capacitors directly on the Board. Such devices operate on low voltages to reduce the risk of disabling other elements.

It is possible to manufacture the attachment to the tester on the schemes published in magazines and on the Internet. But not always it is possible to measure accurately due to the effect of other circuit elements. For example, several parallel capacitors at the end will show the total capacity.

Advice 2: How to check capacitor

In the vehicle there are many electrical systems that perform specific functions. Among these systems is the main - the ignition system. If the engine begins to run unstable, "troit", i.e. one of the cylinders of the engine does not work, you need to check the ignition system.

For this you need to make sure that the spark plugs produce the spark, by means of which the ignition of the fuel mixture in the engine cylinder. If one or more candles give a weak spark is red or uneven appearance, you need to pay attention to the work distributor, which is also called the distributor (from the French "trembleur" which means "breaker").

The new models of cars instead of the mechanical distributor is an electronic switch that in the event of failure changes as a whole. To discover the cause of the unstable operation of the distributor, it is necessary to remove the cover, which is made of hard rubber. In the lid during operation can cause micro cracks, which enters the dust and dirt that causes breakouts in the electric circuit, and a voltage is supplied to the spark plug. After inspection cover need to pay attention to the gap between the breaker contacts. You should also check the condenser in the distributor. If the gaps are normal, but when there is a strong sparking, then the problem is in the condenser. To test it you will need an ammeter.

If you connect the device to the pins, turn the ignition on and hand break contacts in the timer. Observe the indication arrows of the ammeter. If the arrow or the numeric value on the screen closer to zero position, discharge 2-4A, there is a fault in the capacitor and should be replaced.

You can also check the capacitor on their own, when there is suspicion of breakdown to ground. This will require a portable automobile light bulb. First you need to disconnect the wire of the ignition coil along with the condenser wire from the clip circuit breaker and to connect thereto a portable light bulb. At ignition on the lamp should not illuminate. If it burns, it says that the capacitor is defective.

There is another capacitor in the ignition system of the vehicle. It is located in the generator and is designed to reduce interference in the radio. Motorists older remember the radios in the cars reacted to a loud noise on passing trucks and old cars. Today, all generators are mandatory equipped with a condenser.



Advice 3: How to check the capacitor on the performance

The car's engine is its heart. But to correct it requires a coordinated interaction of many factors. One of the most important is the ignition system. The right it setup enables you to use the power of the car in full force. So the main time to prevent possible problems in it, especially the contact mechanism in the distributor. The failure of the capacitor is a pretty rare case, but on the road you need to be prepared for any eventuality.
How to check the capacitor on the performance
You will need
  • - portable lamp;
  • - ohmmeter
Instruction
1
Take a portable lamp, it will help to check the breakdown of the capacitor to ground. Disconnect the wire of the capacitor and wire the ignition coil from the clip circuit breaker, and plug a portable lamp. The capacitor is faulty if the lamp comes on when the ignition is on. To reduce the erosion of the breaker contacts and raising the secondary voltage and parallel connected capacitor. When they open, when the clearance is minimal, a spark and is charging the capacitor. Each ignition system is equipped with its condenser. Usually the capacity is in the range of 0,17—0,35 UF. For automobiles it is in the range 0,20—0,25 mkF. The deviation in the capacitance of the capacitor gives a reduction of the secondary voltage. When it is charging and discharging it does not exceed 5 kV.
2
Disconnect the clamp on the breaker black wire that goes from ignition coil, disconnect the circuit breaker from the leads of the capacitor. They touch each other. Turn on the ignition. When you see the sparks between the ends of the wires will indicate the breakdown of the capacitor. You can also check its serviceability, its charge from the ignition coil high voltage, and then discharge it to ground. If there is spark discharge between the housing and the wire condenser with a distinctive click, it will mean that he is OK. If after charging no spark, then the capacitor is leaking current.
3
Disconnect the condenser and crank engine. The characteristic symptom of the capacitor is excessive arcing between the breaker contacts during starting of the engine. Therefore, the appearance of a very weak spark between ground and the Central high-voltage wire and is strong enough arcing of the contact breaker capacitor broken and requires replacement.
4
Take an ohmmeter. Connect the output capacitor with its case for his discharge. Connect one probe of the ohmmeter to the tip wire, and the second housing (switch the ohmmeter to the upper limit of measurement). If the capacitor is OK, the arrow is deflected sharply in the direction of "0", then slowly return to the symbol "∞". When you change the polarity, arrow more is deflected to "zero." Broken replace the capacitor.
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