Danger of running hot receiver (Kyocera)?
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From: David Nebenzahl on 29 Jun 2010 15:54 Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say "smells like something's burning". Don't have more specific information than that; I'm assuming no magic smoke is visible. I'm advising them that perhaps something (dust, etc.) is in the heat sink that's getting heated and smelling. Apparently the output stages (MOSFET) of these beasts tend to run on the hot side. Question: does anyone know what kind of overcurrent or overtemperature protection this unit has? User is concerned about "ruining" it if it is in fact overheating (which I can't determine at this distance). They're running it with 4-ohm speakers at not-very-high levels; I also suggested trying it with 8-ohm speakers and seeing if the smell lessens. Not much info to go on, I know, but I really would like to know more about any protection circuitry in this piece of gear. -- 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)
From: William R. Walsh on 29 Jun 2010 16:15 Hi! I'm guessing this is of a similar vintage to something like my Kyocera DA-610 CD player (1985)? If it is, I'd expect that you'll find it is Incredibly Overbuilt inside. Kyocera absolutely was *not* cheap-skating on these things. Even so, the DA-610 I found had some problems and needed some simple R&R before it was at its best. Most of it was just age-related wear and tear. The electronics themselves have never needed a thing, but then again, they're not under the stress that an audio amplifier would be. I would at least clean the thing. William
From: Meat Plow on 29 Jun 2010 16:20 On Tue, 29 Jun 2010 12:54:13 -0700, David Nebenzahl ǝʇoɹʍ: > Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say > "smells like something's burning". Don't have more specific information > than that; I'm assuming no magic smoke is visible. I'm advising them > that perhaps something (dust, etc.) is in the heat sink that's getting > heated and smelling. Apparently the output stages (MOSFET) of these > beasts tend to run on the hot side. > > Question: does anyone know what kind of overcurrent or overtemperature > protection this unit has? User is concerned about "ruining" it if it is > in fact overheating (which I can't determine at this distance). They're > running it with 4-ohm speakers at not-very-high levels; I also suggested > trying it with 8-ohm speakers and seeing if the smell lessens. > > Not much info to go on, I know, but I really would like to know more > about any protection circuitry in this piece of gear. If it smells of burning electronics I would strongly suggests the person unplug the unit and get it somewhere to be looked at. Smoking the outputs in a DC coupled amp can cascade back through driver and current control stages in the blink of an eye and cause a catastrophic amount of damage.
From: Robert Macy on 29 Jun 2010 19:15 On Jun 29, 12:54 pm, David Nebenzahl <nob...(a)but.us.chickens> wrote: > Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say > "smells like something's burning". Don't have more specific information > than that; I'm assuming no magic smoke is visible. I'm advising them > that perhaps something (dust, etc.) is in the heat sink that's getting > heated and smelling. Apparently the output stages (MOSFET) of these > beasts tend to run on the hot side. > > Question: does anyone know what kind of overcurrent or overtemperature > protection this unit has? User is concerned about "ruining" it if it is > in fact overheating (which I can't determine at this distance). They're > running it with 4-ohm speakers at not-very-high levels; I also suggested > trying it with 8-ohm speakers and seeing if the smell lessens. > > Not much info to go on, I know, but I really would like to know more > about any protection circuitry in this piece of gear. > > -- > 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) A bit of a reach... A 35 degree rise above ambient in a room at 68 F feels warm to the touch, but when you run the same amp in a hot location, room temp 90F that absolute temperature is now 125F and you feel burnt touching it. Just like its summer here the room temp there could be high, perhaps there is something overheating and outgassing, for a while.
From: David Nebenzahl on 29 Jun 2010 19:39 On 6/29/2010 4:15 PM Robert Macy spake thus: > On Jun 29, 12:54 pm, David Nebenzahl <nob...(a)but.us.chickens> wrote: > >> Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say >> "smells like something's burning". Don't have more specific information >> than that; I'm assuming no magic smoke is visible. I'm advising them >> that perhaps something (dust, etc.) is in the heat sink that's getting >> heated and smelling. Apparently the output stages (MOSFET) of these >> beasts tend to run on the hot side. >> >> Question: does anyone know what kind of overcurrent or overtemperature >> protection this unit has? User is concerned about "ruining" it if it is >> in fact overheating (which I can't determine at this distance). They're >> running it with 4-ohm speakers at not-very-high levels; I also suggested >> trying it with 8-ohm speakers and seeing if the smell lessens. >> >> Not much info to go on, I know, but I really would like to know more >> about any protection circuitry in this piece of gear. > > A bit of a reach... A 35 degree rise above ambient in a room at 68 F > feels warm to the touch, but when you run the same amp in a hot > location, room temp 90F that absolute temperature is now 125F and you > feel burnt touching it. Just like its summer here the room temp there > could be high, perhaps there is something overheating and outgassing, > for a while. That's along the lines of what I was thinking too. I used to use this receiver, which ran fine for years with no noticeable odors whatsoever. It *is* incredibly overbuilt, as someone else mentioned here, so I'm not particularly worried about an impending catastrophic failure. Still would be nice to find out specifically what kinds of protection circuits it has from someone who actually knows ... -- 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)
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