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#1
Posted to rec.audio.tech
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SA-DX1040 Technics Receiver switching to "Protected Mode"
Hi there,
My 6-year-old Technics receiver has recently developed a problem with switching into protected mode (Overloaded appears on the display) after being switched on for a few minutes. Now this model ran extremely hot (couldn't even touch the top of the case) but this was apparently perfectly normal according to the people from Panasonic and other stuff I've read online. Unfortunately, I think the years of heat probably fried something in there. I've tried the following without success: -Switch speakers from channel A to B -Replace speaker wire -Replace speakers and try channel A and B -Turning off both channels still make the receiver go into protected mode -Running the amp without speakers attached Since I suspected that this issue might be heat related I replace the fan at the back of the receiver with a 80mm computer fan wired to a 12V plug-in power supply. To my surprise, the receiver did not go into protected mode the receiver stayed cool to the touch. Although this work around enables me to use the receiver without any problems, I find it very annoying to have to plug in the fan every time I want to listen to music. Additional the hum of the fan is audible when the audio is at low volume. I though about bringing it in to a shop for repair but most shops want $80 just to open the case...it gets more expensive from there. This is probably not worth the money for a 6-year-old receiver. I've read on the forums that Technics receivers a prone to soldier connection failure but I'm not sure where to start looking. Any advice would be greatly appreciated. Cheers, Marc Savage |
#2
Posted to rec.audio.tech
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SA-DX1040 Technics Receiver switching to "Protected Mode"
In article .com, "Marc" wrote:
Hi there, My 6-year-old Technics receiver has recently developed a problem with switching into protected mode (Overloaded appears on the display) after being switched on for a few minutes. Now this model ran extremely hot (couldn't even touch the top of the case) but this was apparently perfectly normal according to the people from Panasonic and other stuff I've read online. Unfortunately, I think the years of heat probably fried something in there. I've tried the following without success: -Switch speakers from channel A to B -Replace speaker wire -Replace speakers and try channel A and B -Turning off both channels still make the receiver go into protected mode -Running the amp without speakers attached Since I suspected that this issue might be heat related I replace the fan at the back of the receiver with a 80mm computer fan wired to a 12V You took the other fan out? It may be a temperature controlled fan which for some reason, is not responding. I still can't figure the heat, but could be a biasing problem. greg |
#3
Posted to rec.audio.tech
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SA-DX1040 Technics Receiver switching to "Protected Mode"
The stock fan on this unit is volume activated instead of temperature
activated. It didn't turn on unless the volume was close to 3/4 max. Heat however, never used cause any problems as I mentioned before. Somehow, I am suspecting that a component in the unit is now heat sensitive...if that can be possible. |
#4
Posted to rec.audio.tech
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SA-DX1040 Technics Receiver switching to "Protected Mode"
First of all, you should order the original fan that goes with the receiver.
You should then troubleshoot it to find out if there are any defective components in the power supply, drivers, and or output stage. Proper servicing of your amplifier will require the necessary skills and tools to do a proper job. -- JANA _____ "Marc" wrote in message oups.com... Hi there, My 6-year-old Technics receiver has recently developed a problem with switching into protected mode (Overloaded appears on the display) after being switched on for a few minutes. Now this model ran extremely hot (couldn't even touch the top of the case) but this was apparently perfectly normal according to the people from Panasonic and other stuff I've read online. Unfortunately, I think the years of heat probably fried something in there. I've tried the following without success: -Switch speakers from channel A to B -Replace speaker wire -Replace speakers and try channel A and B -Turning off both channels still make the receiver go into protected mode -Running the amp without speakers attached Since I suspected that this issue might be heat related I replace the fan at the back of the receiver with a 80mm computer fan wired to a 12V plug-in power supply. To my surprise, the receiver did not go into protected mode the receiver stayed cool to the touch. Although this work around enables me to use the receiver without any problems, I find it very annoying to have to plug in the fan every time I want to listen to music. Additional the hum of the fan is audible when the audio is at low volume. I though about bringing it in to a shop for repair but most shops want $80 just to open the case...it gets more expensive from there. This is probably not worth the money for a 6-year-old receiver. I've read on the forums that Technics receivers a prone to soldier connection failure but I'm not sure where to start looking. Any advice would be greatly appreciated. Cheers, Marc Savage |
#5
Posted to rec.audio.tech
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SA-DX1040 Technics Receiver switching to "Protected Mode"
by then might as well buy a new one, those thing costs only 200 dollars last
time I heard... I used to have one of those Technics reciever (I think its SA-AX.... whatever) and it would get real hot connecting to any 8 ohms speaker... I dont know if its normal and the fan never runs unless the volume is over 12 o clock position. Of course that would blow some speakers or upset some neighbors.... Now I have an integrated amp from Usher and I hook it up to a pair of 8 ohm speaker and it doesnt even get warm.... I wonder why.... maybe it'll get warmer if you connect it to a 4 or 2 ohm speaker? -- TAI FU "JANA" wrote in message ... First of all, you should order the original fan that goes with the receiver. You should then troubleshoot it to find out if there are any defective components in the power supply, drivers, and or output stage. Proper servicing of your amplifier will require the necessary skills and tools to do a proper job. -- JANA _____ "Marc" wrote in message oups.com... Hi there, My 6-year-old Technics receiver has recently developed a problem with switching into protected mode (Overloaded appears on the display) after being switched on for a few minutes. Now this model ran extremely hot (couldn't even touch the top of the case) but this was apparently perfectly normal according to the people from Panasonic and other stuff I've read online. Unfortunately, I think the years of heat probably fried something in there. I've tried the following without success: -Switch speakers from channel A to B -Replace speaker wire -Replace speakers and try channel A and B -Turning off both channels still make the receiver go into protected mode -Running the amp without speakers attached Since I suspected that this issue might be heat related I replace the fan at the back of the receiver with a 80mm computer fan wired to a 12V plug-in power supply. To my surprise, the receiver did not go into protected mode the receiver stayed cool to the touch. Although this work around enables me to use the receiver without any problems, I find it very annoying to have to plug in the fan every time I want to listen to music. Additional the hum of the fan is audible when the audio is at low volume. I though about bringing it in to a shop for repair but most shops want $80 just to open the case...it gets more expensive from there. This is probably not worth the money for a 6-year-old receiver. I've read on the forums that Technics receivers a prone to soldier connection failure but I'm not sure where to start looking. Any advice would be greatly appreciated. Cheers, Marc Savage |
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