Question about APC Back UPS 650 (APWBK650MC) UPS System

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Hi.. my ups model 400w/650va the mosfet 75339p burn out by plugging out with higher amps. can i replace other mosfet other than 75339p? is not avail in my place and what part number or replacement of said thanks ..

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Our BX1500 cycles between "On Battery" and "On


This sounds like a battery issue, test the battery by itself....

Apr 02, 2011 | APC APS BackUPS CS 650VA 400W 230V DB9...

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When connected to power the green light is not showing and the battery light is is always on


This indicates the battery is worn out and will not provide power in the event of a mains power failure.
To test the battery, connect a computer or some other device to the output on the UPS, and connect the UPS to the mains supply. Turn on the mains power to the UPS and power up the computer, then turn off the main power to the UPS and if the computer switch off in a short time.
This proves the battery is old and needs to be replaced.

Mar 19, 2011 | APC APS BackUPS CS 650VA 400W 230V DB9...

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What are the specs for a Cyclone Audio CA598 2-channel car amplifier?


Description: - 2x 400W Max Power - PWM MOSFET Power Supply - High/Low Filter - Adjustable Sub Frequency:(40 - 250Hz) - 3-Way Protection - Bass Boost

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1 Answer

I need 2 chips for an mtx roadthunder 4250d amp the number on the chips are 75339p then there is a y1 and a 44 if u could tell me were i can get them it would be apreciated both chips are the same


HUF75339P3-ND

THE ABOVE LINK WILL TAKE YOU TO THE DIGIKEY PAGE THAT HAS YOUR MOSFETS YOU ARE LOOKING FOR IN THIS AMPLIFIER. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V

Oct 27, 2009 | MTX Thunder 4250D Car Audio Amplifier

1 Answer

No sound out of it, took it apart and found one of the Irfz44n mosfets burned up and the resistor right beside it burned too, What would cause this?Thanks


Hello rjhunting,

Most often the output MOSFET's and associated circuitry will burn out when the amp draws excessive current. And excessive current draw is most often caused by operating the amp into an impedance that is too low. Of course, depending on the age and actual use, the amp could have failed from normal use. The US Acoustics USX-4085 is a relatively good quality low-end amp that was manufactured with excellent components.

All of their amps manufactured after 2001 carried a 3-year warranty. But when operated in "tri-mode", with normal speakers and a subwoofer, the subwoofer minimum impedance rating was 8 ohms. And the normal speakers should be operated through a high pass capacitor while the sub needed a 15.9 mH low pass filter inductor.

The MOSFET's and resistors can probably be replaced at a qualified electronics shop. If you are somewhat handy with a soldering iron and have a controlled temperature soldering station, you can do it yourself. Parts are available from: http://www.allelectronics.com/ and http://www.mouser.com/

Hope this helps.

Sep 27, 2009 | US Acoustics USX-4085 Car Audio Amplifier

1 Answer

Graphics card compatibility with mother board


All PCI-E Graphic card can be used on your motherboard. I suggest nvidia 9500gt 1GB DDR2 128bit because of your power supply. nvidia 9600 & higher models has min. requirement of 400W. if you need higher graphic card model, you need to upgrade your power supply.

Jul 07, 2009 | Computers & Internet

1 Answer

Trying to find the right FET to replace burnt up ones with


hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit

May 23, 2009 | MTX Thunder 5-Channel Amplifier 895 Car...

1 Answer

Computer shuts down on startup


Good morning! it is possible the heat temperature affected the start-up on/off condition, kindly check the CPU FAN if still in good working condition otherwise we have to replace it, then check the computer ventilation if still we need to install an exhaust fan 12v designed for computer. However, another case can be the wattage rating of your Power Supply (ex. 200W) which support the power requirements of all parts & devices of your computer especially during CD burning, if this is the case, I suggest to replace it with higher rating around 400W-500W. best regards

May 09, 2009 | Computers & Internet

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