Posts Tagged ‘multimeter’
Present In The Transistor Base Circuit
Posted by Parkzone Corsair in Power Supply on October 23rd, 2009
Also check transistor pulse generator “power on reset”, and resistor kapasisitor also present in the transistor base circuit. If the transistor circuit is working properly, then the entire output DC voltage regulation will be reset by the PWM generator and consequently the power supply is not completely out DC. Replace new transistor if the transistor POR testing proved defective.
Similarly, if the capacitor in the test will be dry, its value changes, so must the new change with the exact same value as before. Because Power Supply general computer work with a higher temperature than room temperature, then there is the possibility that excessive heat causes legs solderan or component cables there is unimpeded.
Inspect all solderan the Power Supply PCB, even better make sure that the correct relationship with the road re-tin solder is more soft (diluted, Flux 60/40). So the cable connection or leg components may be on the loose knit and guaranteed power supply will generally be able to work normally again.
active components can not be done with a multimeter is serving as ICTL494 PWM generator to control the power switching transistors work. IC is only in the test by comparing the IC of normal power supply to other similar. Use the IC socket with a suspected broken IC is still a good comparison.
If the process of checking and replacement of damaged components as a whole has done, then try the power supply is turned on by placing the burden of drine disk only. Check whether the fan spinning, measuring voltage yellow wire (+12), red (+5), blue (-5), blue (-12), orange (POR) to black wire (ground). When the voltage parameters of the cables are correct, turn off the power supply and replace the motherboard or the load with a full load as before, please try again.
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Checking The Physical Electronic Components
Posted by Parkzone Corsair in Power Supply on October 14th, 2009
Practical ways to improve the computer’s power supply can be done as follows:
- Disconnect the power supply from the box in order to facilitate check Cassing electronic circuits and disconnect all cables from other equipment. Open the power supply box, checking the physical electronic components, there may be unknown burning.
- Check the insert FUSE 220V AC external power source, disconnect it from soketnya FUSE and measure the safety wire connection with ohm-meter at the position X1. Ohm-meter needle should show the value of approximately 0 ohms, which means that FUSE is still good. If the ohm-meter showed an infinite number, then FUSE is broken, should be replaced new. Do not make the connection wire on FUSE that had broken, because its melting current limit will probably be larger and will cause damage to other parts.
- If FUSE either new or had been replaced but still can not remove the DC voltage, then proceed to examine the switching power transistor 2SC3039 (two pieces) which served as the control of the PWM power supply. Remove the two transisitor 2SC3039 of PCBs and do inspection of each condition with a multimeter. If one transistor to replace damaged should be replaced with two new transistors, so guaranteed and symmetrical characteristics, the imbalance is characteristic of the two transistors causing voltage stability problems incurred DC power supply.
- Remove the diode brigde or four pieces of direct diode grader leveling the AC electric current in the insert, check the condition of this diode with multimeter. Sometimes it happens one of his diodes leak or short-circuit, so the AC electrical current to go in the switching circuit and disabling the entire power supply will power transistors were damaged, burned. Even if this diode leakage rate is very large, it will melt the switching transformer, wire peeled off, and connected short, this damage is most fatal.
