Power supply troubleshooting pc repair and maintenance. Unfortunately, vacuum tubes with the exception of space charge tubes. Understanding and troubleshooting the pc power supply. Please make sure you discharge the larger capacitors as they can hold a charge even after mains are disconnected.
The heater runs directly from the power line requiring no transformer or dropping resistor. When the system is operating, the water flow rate and the chlorinator output should be relatively constant. The next power supply is virtually identical to the one above except it uses a 6ax5 rectifier tube instead of a 5y3. Troubleshooting a power supply circuit instrumentationtools. The repair of switch mode power supplies smps is economically a good investment for electronics repair shops and for hobbyists. Lowvoltage ac power supply 6 6 12rectifier assembly filter capacitor incidentally, the low voltage ac power supply is nothing more than a stepdown transformer with a centertapped secondary. Tube power supply design its time for a little confession. Whether you are an experienced power supply designer, designing your first switching power supply or responsible for a make or buy decision for power supplies, the variety of information in the switch. Guitar pedal effects troubleshooting guide sweetwater. Imagine that your pc shuts down without any warning and it doesnt want to turn.
Tube guitar amplifier oscilloscope diagnosis 1102014 4 problems to test for noise with the scope you can look at noise in the power supply and in the signal path. Imagine that your pc shuts down without any warning and it doesnt. However, in contrast to the old low frequency transformers and. Vacuum tube power supply design diy audio projects. With 40mw of rf output, it can be used to transmit voice or music up to hundred metres. Power supply repairtroubleshooting, testing, problems and failure. Nov 01, 2000 of course, at the same time make sure that your cat or dog didnt play a trick on you and unplug the power supply. When its finished i test all the voltages before proceeding. This article is also available in pdf format basic tube power supplies pdf 1.
Samsung plasma power supply repair bn4400445a power factor correction duration. Troubleshooting is the application of logical thinking combined with a thorough knowledge of circuit or system operation to identify and correct a malfunction. Clip one end of one of the clip leads to the chassis. Power supply problems often masquerade as device or software problems. Apply va in steps over 15 minutes, or better still, continuously up to operating value. For those of you a bit confused, most pentium iii desktop pcs are equipped with an atx power supply. Maintenance and troubleshooting of uninterruptible power. Adobe pdf format required to read prints cv8 power supply schematics. The rocker should have the bar flat against the power supply using an analogy of a bridge the power is able to flow when the bar is against the power supply. Page 12 4 test the voltage through the power supply. Electronic repair adventure radio receiver troubleshooting. How to test and set a chinese china made co2 laser power. If you are troubleshooting an issue with more than one. This first one uses a tube that was designed for one tube phonographs.
Get two of your jumper cables and the 100 ohm resistor. Sometimes i get excited about my latest circuit and after looking for just the right tubes, output transformers, coupling caps, and low noise resistors, the power supply design becomes almost an. Computer power supply psu fault troubleshooting and repair. Plug the hp23 supply into the ac outlet and rotate the af gain control until the power switch clicks. The at power supply was common for the ibm pc, xt, and early at models. Most of the ifr products used the same option list. The amp is completely dead if the amp is completely silent no speaker hum or hiss at all then the problem can be just about anywhere in the amp but you should suspect a bad tube, blown fuse or the power supply in that order try a new rectifier tube. How to test and set a chinese china made co2 laser power supply to get long life from your co2 laser tube for your laser engraving and laser cutting machine system. Gas supply to burner shut offmake sure all manual gas supply valves are open. Tube manuals pdf electronic vacuum tube electronics in the. If you are troubleshooting an issue with more than one pedal, test each on individually, then put them connect them together and test again. Remove cord from motor box and check ohms reading between each pin and wire end. When the power supply was switched on, measurements were taken.
The power supply operates under high voltage and current. It is rarely recommended that an inexperienced user open a power supply to make repairs because of the dangerous high voltages present. This is the area near the power transformer, power electrolytic capacitors, and power diodes or vacuum tube rectifier if so equipped. Most common failures were in the older individual power supplies for. Repairing the switching power supply can be processed in two steps. You should also find posted on each piece of equipment a sign listing the specific precautions for that equipment.
The power supply fault could be an open start up resistor only or could be even more than ten components burnt due to heavy lightning strike. I dont always spend as much time on my power supply designs as i should. A normal operating power supply emits an audible tone. Failure to do so may result in serious injury or death. Page 11 test the power supply nc7122au w w w s m a r t p o o l c o m. Picture does not reflect new style power supply design but voltage output is the. Constant current power supply a regulated power supply. If you are interested in detailbydetail manual on repairing. Nov 01, 2000 power supplies come in many different shapes and sizes.
The ramp function allows the user to lower the pressure when they are trying to fall asleep. Notes on the troubleshooting and repair of small switchmode. Fusetp1 tp3 tp4 tp5 tp6 tp8 tp7 dc voltage output tp9 tp10 tp2. Switch mode power supplies 271 pages, please visit. If anyone would like to do an article on troubleshooting and repair wed be happy to put it here. Next up is the power amp which includes the output transformer. Most equip ment problems are caused by operator error, and defective cables and connectors. For example, if the input voltage to the regulator is 330 v, and the output is set to 180 v, with a load current draw of 40 ma the beam power tube dissipates 330 150 v.
The problem can come from many sources, like heat, power surges, and old age. Second, check the overflow switch on the back of the power supply. Computer power supply psu fault troubleshooting and repair replace duration. In this ebook, you will learn all my advance troubleshooting and repairing secrets and you can become a professional in switch mode power supplies repair. Switchmode power supply troubleshooting safety the primary danger to you is from the input side of the supply which is directly connected to the ac line and will have large electrolytic capacitors with 320 v or greater dc when powered often, even if the supply does not work correctly and for some time after being unplugged especially if the power. Tube guitar amplifier oscilloscope diagnosis 1102014 6 steps i follow when i assemble an amp i always start with the power supply. Power supply repair, schematic diagrams 0 in metropolitan cities traffic jams are one of the major problems and for the common man and he who use to travel on their legs is one of the major problems. It is not the intention of the author to discuss the intimate details of power supply design here, but when it comes to grounding we must have at least some idea of how and where all that power comes from.
Tips on repairing smps power supplies without published schematics. The process of troubleshooting comprises the following steps. Temescal system schematics and parts list for power supplies. Regardless if you are fixing and troubleshooting plasma tv, vcd, lcd tv, monitor, dvd, cctv, printer, satellite receiver, xbox, audio equipment, atx power supplies, power adapter, data projector, you absolutely must have this unique effective book to demonstrate you the way to be an expert on switch mode power supplies repair and smps troubleshooting. A systematic approach to troubleshooting consists of three steps. Secrets of smps repair and troubleshooting switch mode power supply smps repair sometimes can be easy and sometimes are quite difficult to solve the problem. Switch mode power supplies repair guide donwnload pdf. The power supply actually has two different power outputs.
Apr 24, 2001 power supply problems often masquerade as device or software problems. Whenever you work with electricity, you must follow all the appropriate safety precautions. Practical troubleshooting of electronic circuits for engineers and. These consist of the electronic power supply, the xenon flash tube and a three conductor shielded cable. Describe how you could detect its presence without using an oscilloscope. The power supply is not repairable and must be replaced if defective. Remove the cover and locate the power supply section. Fixed injection rate an electrical outlet, wired to have power only when the source pump is running, often controls fixedrate chlorine injection pumps. In this example, lets say the error led on a dc power supply has turned on. The amp is completely dead if the amp is completely silent no speaker hum or hiss at all then the problem can be just about anywhere in the amp but you should suspect a bad tube, blown fuse or the power supply in that order. Sometimes things turn out ok and there are no problems. Jan 01, 2016 hello everyone, happy new year and welcome to the order. There are basically three components to a strobe system.
Any convenient, safe connector can be used for the supply outputs. The a battery provided power to the tube filaments typically 1. Ensure the maximum gas supply pressure does not exceed w. Power supply design for vacuum tube amplifiers using rectifier tubes. Vacuum tube audio amplifier discrete semiconductor. In this daily drill down, rodrigo zamora gives you a troubleshooting process to isolate these power related problems. It contains a rectifier and a power amplifier in the same envelope. A technician is troubleshooting a power supply circuit with no dc output voltage. Smps repair guide switch mode power supply repairing tips. Insert the prongs of the voltmeter into the 2 copper plugs of the power supply socket and turning the unit to the on position 2932vdc. Ac voltage enters to the primary side of linear transformer and then converted the ac into a lower or higher ac voltage depending on the secondary winding. Power supply repair, schematic diagrams 0 by joy mukherji the circuit presented here uses a crystal oscillator and frequency multiplier to generate a highlystable carrier signal frequency of 96mhz. Power supply ripple current this book has assumed throughout that a suitable power supply is available.
Power supply troubleshooting and repair tips youtube. The 6ax5 does not require a separate filament winding. Troubleshooting is a process that starts at the source of input and ends at the output. Likewise an article on attenuator repair, oscilloscope tube replacement, or any other ifrrelated topic. Coupling cap, pots, grid stoppers resistors, grid bleeders resistors, tube type, and how the triode gain. As well, you can determine the frequency of the noise. Set the rate of the charger to high and turn the power. Free heathkit diagrams, schematics, service manuals.
The xenon flash tubes used in whelen products come in various shapes and sizes. In this video i show how to repair an atx computer power supply and what are the most common failures. Of switch mode power supply troubleshooting linear power supply was quite easy as compare to switch mode power supplies smps. This manual includes basic information for switching power supply, general. To get started, plug a probe into one of the analog channel inputs, and press the power button. Air leak in oil suction line or check valve not holding. The output voltage rating of a power supply operating in the constant current mode analogous to the output current rating of a supply operating in the constant voltage mode. A dim glow or an extra bright glow may mean tube issues, if the dial or meter pilot lamps glow very brightly turn off the radio and check for a missing or open tube or a tube with a cathode to filament. Today i will tech you how troubleshoot a pc power supply. If you are building for a stereo amplifier, be sure to include both channels. If no audible tone is heard determine if there is a proper input voltage at the power supply and determine is you have a proper ground to the chassis of the vehicle. Strobe troubleshooting guide theory of how strobe technology works. These are generally discussed in terms of the motherboard form factor.
Tubes, tube radios, tube theory, tube guitar amps, tube manuals, tube videos, tube basics, tube pdf s, electron tube theory, tube amplifiers, guitar amps, tube radios, tube electronics, 5 tube radios, tube rectifiers, triode tubes, tetrode tubes, pentode tubes, tube biasing, tube transmitters. Suppose you suspected a failedopen diode in this power supply circuit. Heathkit diagrams, schematics and service manuals download for free. Troubleshooting a power supply circuit troubleshooting is the application of logical thinking combined with a thorough knowledge of circuit or system operation to identify and correct a malfunction. Using a dmm, you measure the line input voltage, and see that it looks fine. Prestige trouble shooting guide alpine home air products. Hello everyone, happy new year and welcome to the order. Tube guitar amplifier oscilloscope diagnosis overview. Early models had a large, red power switch attached to the metal box. The manual is perfect as a reference guide for computer power supply repair. When finished, i again test all voltages without tubes installed. Lcd and crt monitor power supplies, lcd tvs, dvd players, and many other electronic devices that contain a switch mode power supply. Dont waste anymore of your precious time to search from the internet to learn the basic repair. Initial troubleshooting checks ensure all wire connectors to the control module and sensors are securely connected.
Cold cathode tube that converts light in to electrical. Crt cathode ray tube and are putting even more measurement power in the hands of the engineer in. In the front of all electronic technical manuals, you will always find a section on safety precautions. When troubleshooting a strobe light system, you must first determine if the trouble is in the flash tube or the power supply by replacing the flash tube assembly with a known good flash tube. Troubleshooting the power supply basically means isolating the supply as the cause of problems within a system and, if necessary, replacing it. The direction in finding the problem is performed much like following a flow chart, making. Secrets of smps repair and troubleshooting switch mode power. Also, many old ifrs are having power supply problems. The xenon flash tubes used in whelen products come. Like a computer, the instrument will take about a minute to boot up. Once your power supply and cables are in working order, the final step is to test the pedal all by itself with no other pedals or effects in your signal chain. The gain of the signal is determined by its voltage. Technical information and modifications for equipment by. Part 1 the basic power supply power supply constraints and choices the first step is to determine the total load for your power supply.
Sep 16, 2018 the engineers name is jestine and he is pretty much my mentor now in all matters related to troubleshooting switching power supply. You can get this tube and the other parts you need from antique electronic supply. Learn to troubleshoot power supply problems techrepublic. Likewise an article on attenuator repair, oscilloscope tube. The equipment required for this test is a high voltage power supply capable of. Automatic high pressure valve at meter such as sentry. By assembling this laser kit, or buy using the information contained in this manual to build, repair. Your troubleshooting task is to determine if the problem is the power supply, the input supply voltage, or a load change on the demand side of the unit. Most of these tips can apply to any switch mode power supply smps. Apr 02, 2017 power supply troubleshooting and repair tips duration. The large filter capacitor is not the only filter capacitor in the astron circuit. Insert voltage probes in pin terminal 1 and 2 and turn on power supply to test. Before performing any troubleshooting maintenance procedures on your cleaner, it should be disconnected from the power supply transformer and the power supply. Even if there are some problems in the furthest part of any equipment circuit such as a shorted ic or transistor in a monitor color circuit board, the power supply may.
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