72 Threads found on edaboard.com: 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.
Professional Hardware and Electronics Design :: 28.04.2004 23:28 :: harrysoin :: Replies: 1 :: Views: 1113
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.
Hobby Circuits and Small Projects Problems :: 05.08.2004 03:51 :: david90 :: Replies: 3 :: Views: 2555
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
Electronic Elementary Questions :: 16.08.2005 03:39 :: walters :: Replies: 10 :: Views: 2547
You haven't described problems that you have encountered, but here are some hints on SMPS troubleshooting:
Service Manuals, Requests, Repair Tips :: 30.08.2005 01:52 :: IanP :: Replies: 4 :: Views: 2593
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
RF, Microwave, Antennas and Optics :: 15.08.2006 10:55 :: hasmir :: Replies: 3 :: Views: 620
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
Service Manuals, Requests, Repair Tips :: 21.09.2006 00:04 :: comp_freak :: Replies: 4 :: Views: 739
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. (...)
Electronic Elementary Questions :: 06.10.2006 23:48 :: walters :: Replies: 12 :: Views: 890
Does anyone know how to do the trouble shooting of a apple ibook laptop that won't charge its battery?
Service Manuals, Requests, Repair Tips :: 13.10.2006 02:18 :: qualitytechno :: Replies: 2 :: Views: 1063
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 (...)
Analog Circuit Design :: 21.10.2006 00:30 :: qualitytechno :: Replies: 0 :: Views: 1150
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
Robotics and Automatics Forum :: 19.05.2007 15:30 :: mmohamed15 :: Replies: 1 :: Views: 518
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
Professional Hardware and Electronics Design :: 10.11.2007 09:54 :: E-goe :: Replies: 1 :: Views: 1274
My Watt meter:
I am using the schematic as shown above, however there is minor change where I didn?t
Microcontrollers :: 26.02.2009 05:30 :: evios :: Replies: 0 :: Views: 2629
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.
Robotics and Automatics Forum :: 11.05.2009 07:16 :: Champlee :: Replies: 0 :: Views: 1573
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 :-): www.man
Service Manuals, Requests, Repair Tips :: 09.07.2010 12:11 :: karesz :: Replies: 2 :: Views: 1736
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?
Power Electronics :: 27.08.2010 13:22 :: MisaghSepehr :: Replies: 7 :: Views: 570
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 (...)
Electronic Elementary Questions :: 21.10.2010 20:59 :: arsonbob :: Replies: 6 :: Views: 393
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
Power Electronics :: 03.04.2011 07:15 :: romel_emperado :: Replies: 1 :: Views: 1524
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
Power Electronics :: 06.07.2011 12:36 :: david90 :: Replies: 12 :: Views: 972
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
Power Electronics :: 22.07.2011 07:04 :: Strange Problem :: Replies: 0 :: Views: 390
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.
Service Manuals, Requests, Repair Tips :: 29.07.2011 18:15 :: lapoltba :: Replies: 0 :: Views: 419
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.
Microcontrollers :: 17.08.2011 10:43 :: electronicsIdiot :: Replies: 5 :: Views: 1236
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
Service Manuals, Requests, Repair Tips :: 11.09.2011 06:05 :: Kripton2035 :: Replies: 18 :: Views: 2088
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.
Service Manuals, Requests, Repair Tips :: 29.09.2011 09:53 :: auato :: Replies: 2 :: Views: 559
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 :-)
Service Manuals, Requests, Repair Tips :: 28.02.2012 12:53 :: Richman87 :: Replies: 8 :: Views: 789
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
Service Manuals, Requests, Repair Tips :: 06.03.2012 23:00 :: DavGMZ67 :: Replies: 1 :: Views: 642
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 (...)
Electronic Elementary Questions :: 17.05.2012 03:39 :: walters :: Replies: 3 :: Views: 167
Notes on the troubleshooting and Repair of
Small Switchmode power Supplies
Table of Contents
Author and Copyright
The switchmode power supply (SMPS)
Switchmode power supply repair
Most Common Problems
Service Manuals, Requests, Repair Tips :: 20.08.2012 13:50 :: yura717 :: Replies: 6 :: Views: 5019
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
Other Design :: 04.09.2012 05:11 :: sky_123 :: Replies: 5 :: Views: 768
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 - - -[/
Analog Circuit Design :: 07.09.2012 02:20 :: tpetar :: Replies: 30 :: Views: 659
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
Analog Circuit Design :: 24.01.2013 16:18 :: animateme :: Replies: 11 :: Views: 336
troubleshooting And Repairing ATX power Supply
Power Electronics :: 17.04.2013 20:06 :: tpetar :: Replies: 1 :: Views: 134
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
Service Manuals, Requests, Repair Tips :: 03.05.2013 07:11 :: phononlattice :: Replies: 2 :: Views: 302
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.
Analog Circuit Design :: 08.05.2013 10:51 :: guow06 :: Replies: 2 :: Views: 123
anyone here uses those high frequency probes for spectrum analyzer? does it help in troubleshooting? is it accurate? is so any recommendation?
RF, Microwave, Antennas and Optics :: 07.06.2004 10:14 :: marco110 :: Replies: 6 :: Views: 1480
I entered "diode marking B14" into the "General" search field at
Hit #5 was the good one.
Happy troubleshooting. :)
Service Manuals, Requests, Repair Tips :: 25.07.2004 23:33 :: echo47 :: Replies: 3 :: Views: 4605
I have a PCB which I am presently troubleshooting. The portion which I
encountered some strange phenomenon is depicted in the attached
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.
Hobby Circuits and Small Projects Problems :: 16.03.2005 07:55 :: Singapura :: Replies: 6 :: Views: 1198
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
Analog Circuit Design :: 16.04.2005 03:02 :: echo47 :: Replies: 3 :: Views: 514
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.
PC Programming and Interfacing :: 05.05.2005 00:29 :: jay_ec_engg :: Replies: 0 :: Views: 572
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
Microcontrollers :: 05.05.2005 00:33 :: jay_ec_engg :: Replies: 0 :: Views: 1616
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
Microcontrollers :: 27.06.2005 07:33 :: shigure :: Replies: 1 :: Views: 615
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
Analog Circuit Design :: 04.08.2005 23:14 :: echo47 :: Replies: 11 :: Views: 1917
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
RF, Microwave, Antennas and Optics :: 16.09.2005 23:48 :: RFDave :: Replies: 12 :: Views: 1052
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
Microcontrollers :: 14.10.2005 21:03 :: samcheetah :: Replies: 10 :: Views: 3128
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
EDA Jobs :: 21.12.2005 07:04 :: flexx :: Replies: 0 :: Views: 606
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
Electronic Elementary Questions :: 19.02.2006 22:15 :: IanP :: Replies: 3 :: Views: 610
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.
Other Design :: 13.05.2007 08:30 :: echo47 :: Replies: 4 :: Views: 1592
Okay, lets have a recap on your PC prob.
theres always two sides in troubleshooting;
--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
PC Programming and Interfacing :: 09.11.2007 09:23 :: the_risk_master :: Replies: 8 :: Views: 579
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,
Service Manuals, Requests, Repair Tips :: 07.01.2008 18:55 :: House_Cat :: Replies: 12 :: Views: 692
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RF, Microwave, Antennas and Optics :: 23.03.2009 09:01 :: VRoute :: Replies: 0 :: Views: 686
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
RF, Microwave, Antennas and Optics :: 09.04.2009 14:01 :: VSWR :: Replies: 5 :: Views: 1793