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Yamaha RX-V596 humming
Hi, I have a Yamaha RX-V596 home theater that has all of a sudden started to hum, unit is about 8 years old. . You can hear it in all the speakers, it is coming from the unit itself, anyone know what I can do? Thanks, Adam
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#2
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Adamfarber" wrote in message
... Hi, I have a Yamaha RX-V596 home theater that has all of a sudden started to hum, unit is about 8 years old. . You can hear it in all the speakers, it is coming from the unit itself, anyone know what I can do? Thanks, Adam -- Adamfarber If the Yamaha were actually producing hum, this would indicate most likely a power supply problem. Normally the Yamaha's protection circuit would shut it down in this scenario. Does the problem with ONLY the speakers and no other devices hooked up? If not, perhaps a ground loop. This is not uncommon. If so, maybe a main power supply capacitor open circuit - I'm not sure if that would trigger the protect circuit. Mark Z. |
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#4
Posted to rec.audio.tech
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Yamaha RX-V596 humming
On 6/13/2010 12:56 PM Adamfarber spake thus:
Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam The "him"? Oh, you must mean the "hymn". -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) |
#5
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[quote=David Nebenzahl;911263]On 6/13/2010 12:56 PM Adamfarber spake thus:
Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam |
#6
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Adamfarber" wrote in message
... 'Mark Zacharias[_2_ Wrote: ;911215']"Adamfarber" wrote in message ...- Hi, I have a Yamaha RX-V596 home theater that has all of a sudden started to hum, unit is about 8 years old. . You can hear it in all the speakers, it is coming from the unit itself, anyone know what I can do? Thanks, Adam -- Adamfarber- If the Yamaha were actually producing hum, this would indicate most likely a power supply problem. Normally the Yamaha's protection circuit would shut it down in this scenario. Does the problem with ONLY the speakers and no other devices hooked up? If not, perhaps a ground loop. This is not uncommon. If so, maybe a main power supply capacitor open circuit - I'm not sure if that would trigger the protect circuit. Mark Z. Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam -- Adamfarber Well, you would need a schematic at this point, which brings up the question, are you a technical person and able to read the schematic? Mark Z. |
#7
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Adamfarber" wrote in message ... David Nebenzahl;911263 Wrote: On 6/13/2010 12:56 PM Adamfarber spake thus: - Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred -- Adamfarber |
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[quote='Fred[_12_];911292']"Adamfarber" wrote in message ...
David Nebenzahl;911263 Wrote: On 6/13/2010 12:56 PM Adamfarber spake thus: - Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred Hey Fred, thanks for the post. I am somewhat handy, if someone could narrow down which part(s) may be suspect I will replace them so any help you could give me would be GREAT! Adam |
#9
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Adamfarber" wrote in message ... 'Fred[_12_ Wrote: ;911292']"Adamfarber" wrote in message ...- David Nebenzahl;911263 Wrote:- On 6/13/2010 12:56 PM Adamfarber spake thus: -- Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam-- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam-- Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred Hey Fred, thanks for the post. I am somewhat handy, if someone could narrow down which part(s) may be suspect I will replace them so any help you could give me would be GREAT! Adam I'll check the service manual & bulletins when I get back to work (I'm out with the flu at the moment, and don't know for sure when that will be; sometime in the next day or three) and see if I can give you any worth while advice. Some models are damn near impossible to take apart and get back together without the manual. There can be 20 or more cables that have to be unplugged and then plugged back in to the right socket on the right board on reassembly, just to get to the board(s) you need to work on. I'm assuming you want to try a shotgun approach and just replace every cap that could be causing the problem. It'd take a 'scope to figure out what cap *is* the problem. Watch this thread; I'll post again when I have some information for you. Fred -- Adamfarber |
#10
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[quote='Fred[_12_];911336']"Adamfarber" wrote in message ...
'Fred[_12_ Wrote: ;911292']"Adamfarber" wrote in message ...- David Nebenzahl;911263 Wrote:- On 6/13/2010 12:56 PM Adamfarber spake thus: -- Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam-- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam-- Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred Hey Fred, thanks for the post. I am somewhat handy, if someone could narrow down which part(s) may be suspect I will replace them so any help you could give me would be GREAT! Adam I'll check the service manual & bulletins when I get back to work (I'm out with the flu at the moment, and don't know for sure when that will be; sometime in the next day or three) and see if I can give you any worth while advice. Some models are damn near impossible to take apart and get back together without the manual. There can be 20 or more cables that have to be unplugged and then plugged back in to the right socket on the right board on reassembly, just to get to the board(s) you need to work on. I'm assuming you want to try a shotgun approach and just replace every cap that could be causing the problem. It'd take a 'scope to figure out what cap *is* the problem. Watch this thread; I'll post again when I have some information for you. Fred Shall do Fred, thanks again for trying! Adam |
#11
Posted to rec.audio.tech
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Yamaha RX-V596 humming
On Mon, 14 Jun 2010 10:11:08 -0700, "Fred"
wrote: "Adamfarber" wrote in message ... David Nebenzahl;911263 Wrote: On 6/13/2010 12:56 PM Adamfarber spake thus: - Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred -- Adamfarber Allen is still around at Yamaha? I'd have thought he would have retired years ago. Chuck |
#12
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Chuck" wrote in message ... On Mon, 14 Jun 2010 10:11:08 -0700, "Fred" wrote: "Adamfarber" wrote in message ... David Nebenzahl;911263 Wrote: On 6/13/2010 12:56 PM Adamfarber spake thus: - Hi Mark, I unhooked everything and hooked up a speaker to one of the outputs and listened to FM and I still heard the him. Thanks, Adam- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred -- Adamfarber Allen is still around at Yamaha? I'd have thought he would have retired years ago. Chuck He's about the last of the old gang still there, and someone's being groomed to take his place. Probably won't be there a year from now, but I think he's hanging in until his replacement is fully up to speed. Fred |
#13
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Adamfarber" wrote in message ... 'Fred[_12_ Wrote: ;911336']"Adamfarber" wrote in message ...- 'Fred[_12_ Wrote:- ;911292']"Adamfarber" wrote in message ...-- David Nebenzahl;911263 Wrote:- On 6/13/2010 12:56 PM Adamfarber spake thus: -- Hi Mark, I unhooked everything and hooked up a speaker to one of- the- outputs and listened to FM and I still heard the him. Thanks,- Adam--- The "him"? Oh, you must mean the "hymn". Whoops, meant HUM, thanks, Adam--- Most likely a cap in one of the low voltage supplies has failed, feeding unfiltered DC to a regulator which cannot maintain smooth output voltage because the input is going to zero 120 times a second. You have to be a technician with troubleshooting skills, experience with AV receivers, test equipment and service information to fix this. Assuming that's not you, the unit needs to go to a Yamaha warranty station for repair (Yamaha's warranty stations have access not just to service manuals but also to confidential service bulletins, and more importantly they have access to the technical staff at Yamaha, which is the only really competent technical staff in the business). I can call Allen at Yamaha, give him the model number, and he'll tell me what the problem is and how to fix it because he and his staff know their equipment that well. Obviously, I work for a Yamaha warranty station. That's the only company we still do warranty audio work for, because it's the only one with a staff that knows a damn thing about their product. Well, them and McIntosh, but there are no Mac dealers around here, so they don't figure they need a warranty station here (Reno, NV). Fred Hey Fred, thanks for the post. I am somewhat handy, if someone could narrow down which part(s) may be suspect I will replace them so any help you could give me would be GREAT! Adam-- I'll check the service manual & bulletins when I get back to work (I'm out with the flu at the moment, and don't know for sure when that will be; sometime in the next day or three) and see if I can give you any worth while advice. Some models are damn near impossible to take apart and get back together without the manual. There can be 20 or more cables that have to be unplugged and then plugged back in to the right socket on the right board on reassembly, just to get to the board(s) you need to work on. I'm assuming you want to try a shotgun approach and just replace every cap that could be causing the problem. It'd take a 'scope to figure out what cap *is* the problem. Watch this thread; I'll post again when I have some information for you. Fred Shall do Fred, thanks again for trying! Adam Hi Adam, Finally got back to work today, and had a look at the service manual. First, you want to check the + & - voltages to the output stage. To do this, you'll need a Digital Multi-Meter (DVM). You want to check the voltage from chassis ground to the collectors of any two adjacent output transistors in the power amp with the unit powered up. Be careful not to let the meter probe touch anything else while doing this, or you'll get a big arc and blown fuses or worse. The exact voltage will depend on your line voltage and the setting of the 4/8 ohm switch on the rear panel; the range is approximately +/- 40V to +/- 70V. What's important is that the + voltage equals the - voltage within a volt or two. If the voltages are not nearly equal, the main filter cap for the lower of the two voltages is probably bad. Those caps are on the Main (3) board at the left rear of the unit. It the unit passes that test, one of the following capacitors is probably bad, and without a scope the only way to proceed is to obtain replacements for all of them and replace them all. On the Power (5) board, in the left front of the unit, mounted on the power xfmr secondary: C451 & 452, 330uf @ 50V. C453 & 455, 4700uf @ 25V. C458 & 463, 4700uf @ 16V. Lastly, on the Main (3) board previously mentioned, C760 & 761, 100uf @ 50V. If replacing these caps doesn't eliminate the hum, or if all this sounds way over your head, it's either off to a warranty station with the unit, or off to the electronics store in search of a replacement. I would expect repair to cost between $100 & $200. This is a pretty old unit; the service manual was printed on paper. These days everything is in PDF on the computer. Hope this helps, Fred -- Adamfarber |
#14
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Zack" wrote in message ... Fred wrote: If replacing these caps doesn't eliminate the hum, or if all this sounds way over your head, it's either off to a warranty station with the unit, or off to the electronics store in search of a replacement. I would expect repair to cost between $100 & $200. This is a pretty old unit; the service manual was printed on paper. These days everything is in PDF on the computer. Fred, if you think that is old, I have an AX-630 which drops one or both channels intermittently. During the dropout, the audio is low and distorted with mostly just buzzing. Increasing the volume sometimes breaks through the distortion and the problem goes away for a time. The unit has an AST pack, so replacing just the amp (which otherwise sounds great when it is working) would require new speakers. Any ideas what might be wrong with it? Reseating the wires external and internal does not seem to result in a fix. Mostly happens while using the tuner, a TX-400U - which had a bad solder joint on the output that was fixed a few years ago. Hey Zack, You say it mostly happens while using the tuner. I assume that's because you mostly listen to the radio. But if it also happens when listening to other sources like CD, the problem has to be in the amp. So here's a plan: First thing to do is attack the switches & controls with Caig De-Oxit D5. Push button switches often require removal of the front panel so you can spray de-oxit into the switch where the shaft from the button enters the switch. Spray and then cycle the switch 8 or 10 times. Pots only need de-oxit if they scratch or cut out when rotated from limit to limit. If they're doing that, they need to have the de-oxit sprayed in where the terminals come out. It often helps to put a 90 degree bend in the last inch or two of the spray tube so you can aim the spray up or down and into the pot where it's connected to the pc board. After spraying the pot, turn it back and forth, limit to limit, at least a half dozen times. Sometimes you have to pull the pc board out of the unit to get access to the pots. ;-( De-oxit is powerful stuff. You don't have to flood the area for it to work - a quick blast will do ya if it's aimed right. Given that both channels are cutting out individually, it's about a 98% chance the de-oxit is going to solve your problem if you do it right. But if that doesn't do it, then it's a matter of finding the bad connection by visual inspection, mechanical shock (a tap here, a tap there), thermal shock (freeze spray, heat gun), and/or good old fashioned signal tracing with a scope or signal tracer while the unit's misbehaving. Comparing the same point in the bad channel with the working channel will tell you if what you're seeing or hearing is OK or not. Keep in mind it's possible the bad connection is inside a transistor or IC - freeze spray is good for finding that kind of problem. It really helps to have a schematic so you can see where the signal goes next if de-oxit doesn't fix it. Given its age, you can probably find the service manual for your amp on the internet in pdf form, possibly for a few $ from one of the many service manual purveyors out there these days. Google is your friend. Good luck, Fred |
#15
Posted to rec.audio.tech
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Yamaha RX-V596 humming
"Zack" wrote in message ... Fred wrote: "Zack" wrote in message ... if you think that is old, I have an AX-630 which drops one or both channels intermittently. During the dropout, the audio is low and distorted with mostly just buzzing. Increasing the volume sometimes breaks through the distortion and the problem goes away for a time. The unit has an AST pack, so replacing just the amp (which otherwise sounds great when it is working) would require new speakers. Any ideas what might be wrong with it? Reseating the wires external and internal does not seem to result in a fix. Mostly happens while using the tuner, a TX-400U - which had a bad solder joint on the output that was fixed a few years ago. Hey Zack, You say it mostly happens while using the tuner. I assume that's because you mostly listen to the radio. But if it also happens when listening to other sources like CD, the problem has to be in the amp. So here's a plan: First thing to do is attack the switches & controls with Caig De-Oxit D5. Push button switches often require removal of the front panel so you can spray de-oxit into the switch where the shaft from the button enters the switch. Spray and then cycle the switch 8 or 10 times. This sounds like a good idea. Pots only need de-oxit if they scratch or cut out when rotated from limit to limit. If they're doing that, they need to have the de-oxit sprayed in The controls are in remarkably good shape and don't have any noise when rotated. Kudos to Yamaha on that front. De-oxit is powerful stuff. You don't have to flood the area for it to work - a quick blast will do ya if it's aimed right. Given that both channels are cutting out individually, it's about a 98% chance the de-oxit is going to solve your problem if you do it right. But if that doesn't do it, then it's a matter of finding the bad connection by visual inspection, mechanical shock (a tap here, a tap there), thermal shock (freeze spray, heat gun), and/or good old fashioned signal tracing with a scope or signal tracer while the unit's misbehaving. Comparing the same point in the bad channel with the working channel will tell you if what you're seeing or hearing is OK or not. Keep in mind it's possible the bad connection is inside a transistor or IC - freeze spray is good for finding that kind of problem. It really helps to have a schematic so you can see where the signal goes next if de-oxit doesn't fix it. Given its age, you can probably find the service manual for your amp on the internet in pdf form, possibly for a few $ from one of the many service manual purveyors out there these days. Google is your friend. Ironically, Yamaha has since released a DSP amp with the same ID that has loads of chips and gagdetry my unit does not have. Makes Google harder to use. Thanks for the tips, they are something to try! Zack, I don't know what Yamaha's policy is concerning service info for non-warranty servicers; I've been doing warranty work for them since they first went into the consumer audio business. You might be able to get the service manual from Yamaha for a few bucks if you wind up needing it. It's worth a phone call or an email to find out. Fred |
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exact same problem. I have already obtained the capacitors mentioned earlier in this thread (C451 & 452, 330uf @ 50V. C453 & 455, 4700uf @ 25V. C458 & 463, 4700uf @ 16V. C760 & 761, 100uf @ 50V) and the service manual for this amplifier. My question is this: the C760 and 761 capacitors in my amplifier are 100uf @ 63V instead of 50V. The service manual agrees with what Fred said, it also states that C760 & 761 are 100uf @ 50V. Can I still replace the capacitors with the ones I bought (100uf @ 50V) or should I buy new ones rated at 63V? I would like to trust what the service manual says and just pop in the 50V capacitors even though the board currently has 63V ones. Last edited by jackster : January 25th 11 at 10:30 PM |
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