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72 Threads found on Troubleshooting Power
anyone has this book? i am a novice power supply designer, i want to supplement the knowledge about emc especial pratical troubleshooting , i read the content of this book, it is very attracting. it is very kind who can upload this book.
It only powers on for about a sec. then it turns off. If you attempt to turn it back on after it turns off, it will not turn on. Its like it has a self reseting circuit breaker or somethhing.
If a Amplifier keeps blowing fuses where to start and how to start troubleshooting ? How to use the Variac in this situation have to bring up the voltage but when you bring it up to the operating voltage it blows the fuse so what does a tech. do in this situation? If i use the Variac at HALF the voltage then the output of the power supply and
You haven't described problems that you have encountered, but here are some hints on SMPS troubleshooting: Regards, IanP
The main suppliers of discrete transistors in this frequency range are: Filtronic ( for example LP3000p100 is a 33dbm Phemt), MA/COM,Eudyna,... Anyway I would suggest that you use an internally matched module which reduces the cost of pripherals and test and troubleshooting by regarding the fact that its price is about 2 times a simple transisto
Problem : Friend of mine PC stop workin there was nothing coming on screen. So he asked me to help. I went check the pc , i thought sometihng mighe be wrong with Monitor or cables i check everthing and problem was not fixed. So i brought CPU home. As my troubleshooting skills the next day I open box and try to boot pc but no bip sound i knw it's
What are some basic troubleshooting formulas to use when u troubleshoot circuits ? What are some critical troubleshooting formulas u must use when doing troubleshooting any circuit? 1.) Use Ohms law to calculate resistor voltages,voltage drops,currents and resistor power dissipation to find the wattage value. (...)
Does anyone know how to do the trouble shooting of a apple ibook laptop that won't charge its battery? :?::?::?:
My LCD monitor doesn't wanna turn on, and I Just can troubleshoot that from the power cord to power board "CML 700C" there has a problem, I measured the pin out and found out that the pin +12V has no voltage but the others such +3.3V and +5V, has no problem. and I also measure all of the pin to pin there was no power on a kind of rectifier (...)
dear friends i working as electrical maintenance and automation engineer at a cement plant i need some tips for troubleshooting the faults in mcc and control panels for example where to start and what is the most common faults could you hlp me in that
Hi, Let me first describe my testsetup ( see attachment ). The testsetup to debug the LVDS link between the sensor and the controller board contains 3 boards: 1.Digital controller board: this board contains an FPGA ( Spartan 3E ). This FPGA sends commands (CMOS levels )to the sensor, which is located on the plugin board. The data send back f
Watt Meter Project reference: ASM code: Schematic: My Watt meter: I am using the schematic as shown above, however there is minor change where I didn?t
Can anyone help me get the troubleshooting manual for a Nikki Denso make inverter NPSA-102MU. There is no Output from the inverter after connecting the input power. The 3-phase bridge is OK as the DC power is generated at its output.
Hi, Smoe body has it on the eBay yet, & wrote thta has pdf manual! Ask him .. :-) "I have a PDF of the manual I can email you. Full service manual too.. includes troubleshooting/repair notes." For worst case solution(?) has Manualsurplus for $30,- too :-):
Hello everybody; I have a PC power supply in which when I connect Green wire to GND wire the power supply fan just turns for 20 degree and then stops.TL494 and rectifier diodes are healthy but I don't know how to remove the trouble of this power supply.further, +5V stand by is live too.what should I do? tnx
So my idea for a halloween costume is a large scale, functional and lit-up simon (the old electronic memory game) costume. The question I have, is since the power source for the game I have in hand right now is only about 4.5v (and those that can be acquired are only 6v), how can I modify the power source in order to allow me to power (...)
since it's very difficult for us to identify what is the error you are getting through we cannot make any precise advice of what is the problem is.. kindly check the voltages stage by stage from the source to your output for you to identify where or what is the problem you said that the UC3843 ouput is not present so that would be the best hint
I have a dreamcast game console and the power supply works intermittently when it powers up cold. If I leave the ps on for about 20 sec, then it will work fine. The ps has 3 output voltages: 12V, 5V and 3.3V. The 3.3V output measured 2.5V and it caused the console to malfunction. The 12V and 5V rail work fine. The ps has one pwm controller chi
Hi, I get a ATX PSU 450W for Repairing one of my customer . But This PSU have all parts OK . I am getting 5V PS-ON and 5VSB . The power Supply is not running . But this PSU is Running - When I make short Pin 4 of TL494 with GND and this time I do not need to short PS-ON with Ground . Just Short Pin 4 with Grou
So I acquired these two scopes when my scholl was throwing out a bunch of equipment. I got a ton of plugins for them too. I have one working 7854 but the other one and the 7633 both will not turn on at all. They immediately blow their fuse. I am assuming it is most likely an issue with the power supply, and probably the capacitors. I was
HI, to all I made 2 keypads 3x3,4x4. I think I made them wrong. I want to troubleshoot the problem please guide me in that and can I do the job of keypad from only one port for input as well as output because book says to use 2 separate ports one for the input and one for the output.I think by doing all this in one port is good Idea. Please
a cheep-cheep-cheep sound coming from the smps often leads to a cap with a bad esr on the secondary side... did you replace the caps and/or do you have an esr meter to check them ? other valuable source for repairing smps : Notes on the troubleshooting and Repair of Small Switchmode power Supplies
Hi mates! Look at this (the first 15 seconds of video = summary of all Give me a hint where to start my troubleshooting. power supplies seem to be in the ranges. bye auato
Hi, I have an alarm device with buzzer, it must be 65db loud, but it produces only very low sound. I've checked the transistor and transformer driving the buzzer, and found they are good. Is the problem definitely in the buzzer? If yes, can it be repaired? or it must be replaced Thanks for experience sharers :-)
I had started troubleshooting the capacitors on the motherboard and found c512 to pulsate rapidly when checking resistance during voltage rise on the charge cycle. I never seen a capacitor do this in all my years as a technician. My only problem now is finding out what value of capacitance C512 is? I do not have a schematic. Can anyone tell me wha
What are some troubleshooting procedures 1.) First check the power supply voltage 2.) Check the V+ on IC chips to check if the IC chip is getting power 3.) Check every input and output for each stage of a transistor or IC op amp of the circuit until you find no signal 4.) Can you add any others on the list A SHORT Will make the (...)
Notes on the troubleshooting and Repair of Small Switchmode power Supplies Table of Contents Preface Author and Copyright DISCLAIMER Introduction The switchmode power supply (SMPS) Switchmode power supply repair Most Common Problems
No offence, but unless you're going to invest time learning about circuits and troubleshooting circuits, and hundreds of dollars in equipment and test gear, you're going to find it hard to assemble such a power supply no matter how much help people give you over the internet. As Godfrey mentioned, it is not possible to "adapt" an existing 220V PS
I finally success to open circuit from post#10 there is some problem with thise images. This images are in small resolution, small text cant be readed clearly. This circuit is not finished, its very important to give circuit what you try. troubleshooting can be done only for scenario where problem exist. - - - Updated - - -[/
Hello, I have an old xenon strobe (disco light) that had been stored for a very long time and when I tried to turn it on recently, it no longer worked. I first assumed it was the xenon tube bulb so I replaced it but it still does not work. I opened it up (circuit was inside wood box) to try and measure voltage at different points to see if I co
troubleshooting And Repairing ATX power Supply
Dear sir, this is my first post, on this site and on internet. i have a Samsung NP-RV511-A05AE Laptop, its has main chipset as Intel HM55 Chipset with intel core i5 processor my sister had given it for repair at samsung service center, they did not repair as it was costing more, but they had said that when they put process
Sure it is. I have no idea what could the reason be. I have a chance to put a test structure on a test chip, so I have to think what structure is appropriate. Yes, if latch-up occurs it will short the supply to common. So the high power consumption is likely due to a different problem. Hard to say what that could be.
anyone here uses those high frequency probes for spectrum analyzer? does it help in troubleshooting? is it accurate? is so any recommendation?
Search engines! I entered "diode marking B14" into the "General" search field at Hit #5 was the good one. Happy troubleshooting. :)
I have a PCB which I am presently troubleshooting. The portion which I encountered some strange phenomenon is depicted in the attached diagram. Here, a free running oscillator clocks a counter which drives the address of an EPROM. The data output of the EPROM is then latched to drive the input of a DAC which then outputs a 19.2KHz sine wave.
That sounds like it should work fine. How close together are your two frequencies? Are you experienced at troubleshooting, or is this a new adventure for you? Examine your input signals to be sure they have proper levels, no bad ringing, good rise/fall times, and don't have any small glitches generated from somewhere else in your system. Che
We are trying to get BKM prompt for processor MPC8555E using Vision ICE 7.11A emulator. We need your help in this regard. Please see items below: 1) Please refer attached "Error" file and "Expected" files. From these files, we understood that the test "Testing for target STOP State" is failing on our board and hence could not make furthur progress.
We are trying to get BKM prompt for processor MPC8555E using Vision ICE 7.11A emulator. We need your help in this regard. Please see items below: 1) Please refer attached "Error" file and "Expected" files. From these files, we understood that the test "Testing for target STOP State" is failing on our board and hence could not make furthur progres
Hello all, I am currently building a LED Matrix Display based on Rojo's design. He helped me with alotta stuff, i finished building it already, but i just cant program it. Is there any important settings besides chip type ? (I'm using ATmega16-16pi). I was told to set at TOOLS, progr
Yes, try small emitter resistors. And please wear safety glasses! Once upon a time, a friend of mine was troubleshooting a 500 watt switching power amplifier. I handed him my safety glasses. He asked "do I need these?". I replied "just in case". He put them on. A few minutes later the amplifier blew up and pelted him in the face with flying F
At this point in troubleshooting things, I like to knock off work early, go out for a beer or four, and get a good night's sleep. Once you have a clear head, stop hacking at things, and do the troubleshooting that has been reccomended. Once you finish all those things, you should be able to figure it out. If you can't, come on back with the results
this is a common error which occurs due to the programming voltage being too low. check your power source for ripples. it might have too many ripples and that could be the most likely cause of this problem. i would suggest you to power the programmer from two 9V batteries. that way you wont have any problems with ripple. there could also be one
hi , iam flexx , i am electronics and computers technician , used to work in this field in private work since i was 15 , now i got good experience in many fields . Computer Maintainance (Include monitors and UPS and power supply ) Networking , Router Programming Electronics troubleshooting . Electrical Networking . Lights and sounds
To measure High Voltages (>1000V) you have to use a High Voltage probe .. You can buy one ( ), or you can build one .. Here are examples: "Whether testing a TV with a dim picture, a helium-neon laser power supply that does work quite right, or troubleshooting some home-built high voltage project, the ab
Try searching the service manual for troubleshooting suggestions. Tek service manuals are pretty skimpy these days, but it's better than nothing. You may need to register, but it's free.
Okay, lets have a recap on your PC prob. theres always two sides in troubleshooting; 1. HARDWARE 2. SOFTWARE --In hardware, do you have made any hardware changes before you got your prob.? verify if there are Busted Caps in your MoBo... also installing too many peripherals may also cause this... (check the power rating of the PS
It is not likely to be a virus that is causing your problem. A virus is software, and needs to use the CPU to execute. From what you describe, you're not even getting the bios startup checks that are run from the motherboard firmware. You could have a defective motherboard, a bad power supply, a blown CPU chip, a wiped or defective bios chip,
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From About Circuit Envelope Simulation This is a description of Circuit Envelope simulation, including when to use it, how to set it up, and the data it generates. Examples are provided to show how to use this simulation. Detailed information describes the par