car amplifier repair parts

For more detailed information, follow the links provided. In some instances, you'll need to supply a reasonably good quality photo so that I can read the circuit board designations and make sense of what you're asking. Flash or No-Flash: If you use Octopart, you don't need to enter the term 'datasheet'. For full range amps, a 100uf cap is typically a good choice. The same is true for the output transistors. When you click on it, the larger version will be displayed (as you can do with the image below). When checking them with a multimeter set to 'diode check', you should find that the meter reads ~0.6v in one direction and reads as an open circuit when the probes are reversed. Is it so loud that it absolutely overwhelms any audio, no matter the volume level? Power should not be applied to the amp when checking transistors that have not been removed from the board. Along with that, it's important for your car amplifier to include the input/output options you need, the specifications that indicate great sound, and the flexibility that allows your system to evolve and adapt to future changes and upgrades. If you are not ordering a full stick of parts (50pcs/stick for TO-220 parts), order more than you need so you can be relatively sure you will get enough matched parts. You should find the same thing when checking bipolar transistors. If you're from somewhere other than the US and/or English isn't your native language, do your best and I'll try to help. If the bias is set too high, the outputs will run too hot and be more likely to fail. Some are rectifiers, some are transistors some are regulators. You need to download the datasheet for the transistor to determine the pin configuration (B, C, E). When buying semiconductors, you should only buy from reputable distributors. The following photo was taken outdoors with a heavy overcast. If you need help checking transistors, fill in The negative rail voltage would be the same distance below the reference line as this is above the reference line. Not all of the components clamped to the heatsink are going to be the same thing. When you're dealing with people who are MUCH more knowledgeable than you are about a subject and you do the same thing, you just seem like an idiot. That needs to be cropped. Final Word for this Section: Don't Break an Email Thread/Chain:

The resistor or headlamp will go in series with the B+ power supply wire. If you believe that something doesn't seem quite the same on your amp, ask questions or ask for clarification. This product can be controlled with your voice through Alexa-enabled devices such as Amazon Echo and Amazon Tap. The transistors can even be used as regulators. If the IC has the correct voltage on the 5v reg and the correct voltage on the sawtooth waveform pin, the IC is likely OK. On the forums, do not ask questions about your amp in a repair thread started by someone else with a similar amp.

Note: Previously, we looked a scenario where the amp would try to power up but would go into protect or blow a fuse. In the first two photos, you can see the diffuser I used on this camera. Those with an honest desire to learn the material, not just reading to say that they have done so, will read and re-read the linked pages until they truly understand the material. Others could simply be manufactured with very low standards. This means that the amp has to either be propped up so you can step back and photograph it or you have to place the amp on the floor and photograph it. When you make your original post or request for help, list the test equipment that you have. repair parts amplifier alpine stereo amp power The placement of the probes on the B, C and E are important. If you get strange voltage readings, email me with the make and model number of the amp and I'll try to help you find the correct reference point. If you have a question about a repair, feel free to email me. 77 - Bipolar Transistors If you simply want your amp to work properly and you have no interest in learning more about electronics, pay someone to repair your amplifier. IR_IRF1010EZ Pin 5 should have ~1.5v DC on it. 40 - Potentiometers For example if you post the resistance between two legs of a semiconductor and only post '200', in most instances, that's absolutely meaningless. amplifier 10pcs ic audio lot By continuing you agree to our use of cookies and our overall. Go to page 10a in the directory of the site. If you're the type of person that prefers waiting, you are not likely well suited for any job where you have to think (and this type of work requires you to constantly use logic to find various faults). You want the least angle possible without having the flash reflect off of the board and back into the lens.

Don't be lazy (unless getting the amp repaired is not really important). It may seem like I'm being unreasonable asking for this but this is technical and the language needs to be precise so I don't have to ask for clarification of everything you send me. Generally, when you order parts, you get the same date code but that's not always the case. 60Hz: To remove them, you apply new solder to both sides, heat one end for 2-3 seconds and then move the iron to the other side. Then read the following chapters (some of these are links previously seen in the text above): 23 - Amplifiers Click on the image to view it in a new window. It's also possible that no one will be familiar with the make/model amp you have. If it's on the forum, copy and past the list. The information on this page is for those who are interested in trying to repair their own amplifiers. The original transistor can be sourced from PacParts.com.

Having the bias current set too high is like having the idle setting on your car's engine set to 3000 RPMs instead of 750 RPMs. In manual mode, you can select the shutter speed, the aperture, the ISO and the flash power. When an amplifier will not power up, you have to confirm that you have ~12v across the B+ and ground terminals. amt customizing amp kit parts If you leave it open and return to this page, the next photo may load in the background window and it may appear as if the link isn't working. If you don't understand precisely what a scope does and how they function, read the Oscilloscope page of this site (page #73). Datasheets for Replacement Parts: There are a lot of people who have been using a scope for years and still don't know how to use them. However, it should answer many of the basic questions. When framing the image, set the zoom to the middle of its range and move the camera back/forth to photograph the area of the board that you need help with. Some people (a lot of people) refer to all of the 3-legged components on the heatsink as MOSFETs. In most BJTs, you'll have nothing more than two diodes. Pin 16: . If the drivers are tough, the gate resistors will fail. 80/800/8000Hz: This will prevent the wire from breaking and will make this easy to work with if the amp ever needs to be repaired again. THIS dual op-amp is in an SIP (Single In-line Pin) package (vs the DIP, Dual In-line Pin package). - We are going to ship your amp back in exactly the same packing as you shipped it to us in, so make sure to put extra effort in packaging your amplifier. STMicro_TIP36C The error amps are used for various purposes. That's simply not the case. As you know, a standard diode passes current in only one direction. For most amps, the round-trip for shipping alone will be approximately $60 if you use a shipper with real tracking. Do you have both positive and negative rail voltage on the output transistors? This is the positive rail voltage. The collector is at ground. If you start a new email every time you ask a question, it's very difficult for me (and likely others) to remember what was previously done or even what amp it is. If, after reading this section, you would like more information on macro-photography, you may want to visit my Basic Macro Photography Tutorial site. A buzz would tend to be a mid to high frequency noise. The following image is a wide-shot showing the transistor to the resistor that was added. Some cameras (like the Olympus C-740 that you'll see here) work better in normal mode. Many times, the black plastic turns brown. As you can see, a 2MP camera can take relatively good quality photos. In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. Power Amplifier Section: This does several things. Time is fleeting. Amps like those made by Rockford, must have a working power supply for the power LED to be lit. A short (short circuit) is a path through which current flows that should not be there. The tripod sockets are typically relatively fragile plastic so you have to be very careful to avoid breaking them. Photos, especially good quality photos, allow me to see the amp in question and will often make it possible to help the owner get it repaired. IR_IRFZ44N This prevents damage to the speakers in case the amp fails in a way that causes rail voltage to be driven to the speaker output terminals. Start your own thread. The next image shows what the cropped image looks like. Turn around time is dependent on how many amplifiers we have before yours, and we will not put anyone ahead of anyone else on the list. The small bias compensation transistor prevents the bias current from changing significantly. Some class D amps are noisy. If I find images that are significantly better than what you took with your camera, it's unlikely that you will get a response. No one knows everything and when you're beginning a new hobby/trade, you're not expected to know anything. When power supply transistors fail dramatically (smoke, flames, soot blown out onto the board), they generally short internally (all terminals shorted together) but the high current flow causes the third leg to fuse open. The following section is to help prevent confusion and provide additional information. The driver transistors drive the square wave signal into the gate resistors (the resistors connected to the gate terminal of the power supply FETs). Many of the visitors of this site claim that they want to learn to do repair work for profit. Without voltage on pin 12, the IC won't power up. If you ask me for help and use chatspeak, LEET or truncated/abbreviated words (ur for you are, str8 for straight, etc), don't expect me to reply. Instead of the previous description, you'd have something like this 'transistors Q101, Q102, Q103 and Q104 do this' and 'Q105, Q106, Q107 and Q108 do this'. It may take 10 or 15 minutes to do this but if you have to post a question asking which is which and no one replies for a day or the person helping you can only get to the forum once a day, it will save an entire day because you won't have to wait for an answer you can find on your own. In the following images, you can see that one meter reading is approximately 3.3k ohms. The power supply FETs in this amp aren't blown. When measuring most voltages, you will place the black meter probe on the amplifier's primary ground (the amplifier's main ground terminal). The components are all in focus in the image below but the bright reflection is distracting and fatiguing, especially if you have to look at multiple photos or if you have to study the photo for more than a few seconds. As you can see below, Q4901 has a brown tint compared to the other D600 transistor. Does that mean that there is a problem with the gain control (the amp could begin to oscillate due to an open connection in the pot) or with something that's causing the amp to shut down when the output reaches a certain level. 85 - Pulse Width Modulated Power Supplies I couldn't use the full auto mode with this camera. The collector of Q4901 is directly connected to ground (primary and secondary grounds are tied together). As of this time, most are useless for this purpose. You should understand that no one can know what every amp looks like so it may not be possible to help with every repair. R147 is the pink resistor. Your recently viewed items and featured recommendations, Select the department you want to search in. If one or more are just slightly different, the load will not be shared equally and it can cause the amp to fail prematurely. 46 - Capacitor It's generally due to a lack of effort to learn what the camera can or cannot do. A new section has been added to help you get the information I will need. The first shows the scope with DC coupling (read the 'Oscilloscope' page of this site if you don't understand 'coupling'). When asking for help, be sure to note whether the noise is audible or not in the speakers. Don't Try to Seem like You Know what You're Talking About if You Don't: If you're emailing me (or anyone who can help you), maintain an unbroken chain of emails. Unless the photos is very good and only includes a few closely spaced objects, the minimum resolution (often 640x480) is useless. If you're interested in doing this as a side-line job, the tutorial will be a great help. Save a copy to the computer. Some screws that hold the board are simply for support.

If you're asking for help with a repair and you include answers to the following questions in the initial email/post, it will generally greatly speed up the process. I know that this takes extra effort but it makes it much easier for others to help you. If a smaller transistor is driving a larger transistor (or a group of larger transistors), you generally refer to them as driver transistors. When powering up an amplifier that you're repairing, you should do so with a 10 amp ATC/ATO fuse in the B+ power line. If you don't want your amp to go up in flames, read the following very carefully (don't just skim over it). I don't want you to think that I'm telling everyone to go out and buy a 2MHz scope. I try to help as many people as possible and if you won't cooperate, I can't help you. To help the page load more quickly and to save bandwidth, many of the photos will be loaded from links. It will work for subwoofer amps as well but the 100uF cap will block most bass. - In order to provide the quickest service, use the "Contact us" form on the left hand side of the main page. When you start a forum thread, include photos of the main board (at the very least). Most of the other links are to web pages on this site. People who want to appear to know more than they do just waste the time of those from which they're asking for help. If you think you'd like to be an electronics technician, you'll have to decide whether you want to understand the circuits, troubleshoot the problem and replace only the components (or group of components) that are necessary to repair the amplifier. If you don't use a small fuse a very minor slip of a meter probe could result in hundreds of dollars worth of damage in a tiny fraction of a second. There is a colon after each pin number so that the person filling in the blanks doesn't use hyphens (which can be mistaken for a negative sign). jbl monoblock Note the locations of the base, collector and emitter. In most amplifiers, the rail voltage is much too high for the op-amps. Reducing Variables When Troubleshooting: Troubleshooting a dead amplifier is different. R52 is the large gray resistor. Amps like those made by Sony may have all green lights lit even if an amplifier has a blown power supply. IR_IRF3205Z Crossovers/Filters: Harris_RFG70N06 The following is a list of things that will help you from making a few of the most common mistakes. To switch to macro mode, look for the button or setting that looks like a tulip/flower. Each IC has various input pins (to error amps or other internal control circuits). If you use Mouser or Digi-Key for parts, when you look up a part, a link will be provided for the datasheet on the information page for the part. When unused, pin 15 is tied to 5v (pin 14) and pin 16 is tied to ground. The voltage amplifier drives the driver transistors and the driver transistors (2SC3421 and 2SA1358) drive the output transistors. You can find more information about these on THIS page. Depending on how busy the person helping you is, that could mean a day or even a week wasted. Pin 5: Too many people are lazy and would prefer to wait on an answer because that lets them relax and gives an excuse for doing nothing. This tells me a lot about a person's willingness/drive to learn. This image has a lot of useless space. If there is any difference in the two inputs of the differential amplifier, the error will be corrected. For more information on PWM supplies, follow THIS link. 11 product ratings - CARVER M-1.0t 2 CHANNEL MAGNETIC FIELD POWER AMPLIFIER For Parts Or Repair As Is, 3 product ratings - Sansui 5000 Stereo Receiver Tuner Amplifier *Parts or Repair/ Untested Only*, Amplifier Repair In Vintage Stereo Receivers, Amplifier Repair In Vintage Amplifiers & Tube Amps. In most class AB and class B amps (most full range amps fall into one of these categories) you will also find rail voltage on the center legs of the output transistors. You should read approximately 11.5v between pin 15 (black probe) and pin 3 (red probe) on the IR2010S ICs. The signal is a 160kHz square wave.

The second photo is the same signal displayed on a Tektronix 5110 oscilloscope rated for 2MHz (not a misprint, 2MHz). I'm sure that in a few years they will get better but they're not there yet (mid 2011). For those who read this and see something that they've done and think I'm singling them out, rest assured that I'm not. 101 - Regulated vs Unregulated Power Supplies. They are available used on eBay for about $50. In class D amplifiers, you should not make any substitutions. The following image shows the waveform locked on the display. If you're repairing an amplifier that has blown output transistors, you should check the driver transistors also. The configuration will vary from amp to amp but the basic layout of the parallel components will be similar to what you see here. The next image is what NOT to post. For regulated power supplies, the square wave output has a variable duty cycle. This is actually a, Pins 1, 2, 15, and 16 are the error amps and drive pin 3 internally (see datasheet for internal schematic). http://www.bcae1.com/temp/80hz800hz8khztestsignal01.zip. Many times, a distorted or intermittent channel is due to nothing more than a dirty contact in a potentiometer or a switch. All of the transistors clamped to the heatsink are 'power transistors'. The list is precisely as it is for a reason. Those who don't understand that intelligent people can be ignorant, don't know the definition of ignorant. 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Hitachi_2SJ50 If you have one but not the other and the amp isn't a class D amp (some class D amps only use positive rail voltage), you need to determine why you don't have both positive and negative rail voltage. 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I try to push and prod them to get motivated but it's difficult (I'm referring to those who 'claim' they want to learn). Many people ask for help with their amps when trying to do their own repairs. The most important is to take the stress off of the wire's solder connections. When one component in a parallel group fails, all in the group MUST be replaced for optimum reliability. They limit the current going into the amplifier but generally allow enough current so that you can troubleshoot the problem. In this amplifier, the two transistors of the differential amplifier are in one package. This is only used for low power and initial testing/troubleshooting. In most instances, 200 ohms and 200k ohms makes a huge difference. If you don't fully understand how diodes function, visit the DIODES page of the site. In most amplifiers, the rail voltage can be measured on the center leg of the 3-legged, dual rectifiers. If the tab is allowed to contact the heatsink, it will cause the amp to fail. Using good equipment and good technique, you will be able to replace them easily. An open (open circuit) is a break in the circuit. - While we will take in many different brands and models of amplifiers, we are not currently taking in any Brazilian built amplifiers, Lanzar Opti series amplifier, and some other select models that use proprietary parts. Not only is the image too small, it doesn't make the most of the frame of the camera. Using the wrong term/name for a component is worse than asking what a component is, in my opinion. You need to pull the transistors from the board for definitive testing/results. Try the following in ohms AND diode test modes: Amp Failure: Do you best to make the photos you post as good/useful as they can be.

When measuring voltage, resistance, whatever the units are VERY important. This is something we care about and hope you care about too. For those who are not familiar with cameras, the tripod socket on the bottom of the camera is a standard 1/4"-20. It's not necessary to have an expensive camera or accessories to take decent photos. If you're using IE, open Firefox or Chrome (you get the idea) and open the link in the other browser. I have received more requests for the service manual for this amp than any other. If you need internal photos of an amp to identify burned or missing components, email me at: babin_perry@yahoo.com. If you set up an output section to where there is always a tiny current flowing through the transistors (class AB operation), this current will change as the temperature of the transistors changes. - If you send us an amplifier, and there turns out to be nothing wrong with it, there will be a $35 testing fee for the amplifier, if the amplifier does need repair, there is no testing fee applied. Intelligent, ignorant people ask questions to learn. The transistor fails because it runs too hot. Don't forget to enter the transistor's part number in the form. There seems to be a problem serving the request at this time, {"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}. If you get a reading of near zero ohms with any combination of the meter probes across the legs of any individual transistor, the transistor is likely shorted (or is in parallel with a shorted component). The following camera and diffuser was used to take the next circuit board image. Many times, when you copy a link from the address bar (especially for something found via the search function on a site), the link will only work from the browser that was used for the search. If you send me a poor quality image, I'll look at the EXIF data.

Near the bottom of this page, there will be a section dedicated to helping you take better photos. Yet another problem is that the heatsink has a high spot where the screw is threaded into the sink. Sometimes, technicians don't clean up the mess from a previous failure. Even if the replacement part has the identical part number, it will not be exactly the same as the original parts and won't share the load properly. Pin 10:

It's often good to crop a photo. More detailed photos will follow.

Now I have to respond to hundreds of requests (literally) every week.

The cost of the tutorial below is far less than the cost of the components that most rookie techs will destroy in their first few repairs. If you're too lazy or getting the amp repaired isn't important enough to CAREFULLY and COMPLETELY read this section, please don't email me for help. One of the most important things you need to do when asking for help is to use proper grammar. If you're serious about learning to do this type of work, you should follow the links and read the pages from top to bottom. Each of the 8 pin op-amp packages in the photo contains 2 op-amps. It allows you to set the bias/idle current of the output transistors. If they're used in the power supply, you'd likely refer to them as power supply transistors or power supply FETs. While I have a lot of photos and schematic diagrams (been collecting them for quite a long time), I don't have information on every amp. This is another simple and cheap device that makes the photos much better. The other other rectifier passes all of the negative pulses to the negative rail capacitor. IR_IRFZ34N Many people use the terms hiss, hum, buzz. If you look closely at the first value, you can see that there is a 'k' in front of the symbol for ohms. - The Amp Lab is proud to offer car amplifier repair as a service to our customers, and we hope this guide will help keep it as a smooth and easy process. If you did know everything, you wouldn't need the help. For the TL594, the output is typically taken from pins 9 and 10 (MTX, Sony and a few other amps use pins 8 and 11 as the outputs). As I mentioned before, the gate often shorts to the drain (terminals 1 and 2 of the FET -- look at the IRF1010EZ datasheet, page 9). If you don't, at the very least, have a multimeter, there's really no way that anyone can help you. For transistors manufactured by KEC, the prefix is KT instead of 2S. The transistors that are used to drive the rail voltage to the speakers should be referred to as 'output transistors'. SK_2SC4467 For example, an FET could be used in the power supply or in the output stage of the audio power amplifier.

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