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Mission subwoofer model 700ASi started humming. Has a continuing hum when pluged in. Gerrn light is on indicating stand by mode. It doesn't matter if connected to reciever or not, constant hum? What do I do? Larry lldrew47@sympatico.ca

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2 Answers

KLH HPS 1100 powered subwoofer. as soon as plugged into AC we get a loud hum from spkr. had unit for 8yrs.


Hum usually indicates a power supply problem. If it has an internal supply you will need someone to check it's producing clean DC. Alternatively if you do open it (beware risk of shock!!) initially visually check condition of /replace any bulging electrolytic capacitors.

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Khhc2090s trouble


The sensor errors are probably just from opening the door and interrupting the sensor cook cycle.

By the way, you should always press "Stop" before opening the door of a running microwave. Otherwise, the door switches will prematurely fail.

I would first check the door switches and their mounts. See this help file.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

12_3_2011_7_32_02_pm.jpg

You can also download manuals, installations info, and parts lists here.

dee77f7.jpgWe're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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I have atomic A-8 subwoofer and philips FR740 receiver. when i turn the amplifier and the subwoofer "on", the subwoofer starts to hum loudly and it is wery annoying. i made all the connections...


The symptom sounds like an open signal shield somewhere and the cable is acting like an antenna for airborne electrical noise.

Disconnect the RCA cable at the sub. Is it still humming? NO? Problem is external to it. YES? Internal. Broken ground somewhere.

Recheck all connections making sure to twist the RCA head as you install it so oxides will be worn off.

Consider what may have changed in the environment regarding electrical devices, motors, magnetic sources. Ensure signal and speaker wires as ar not running are as non-parallel to any power cords as practicable.

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Sunfire MK II Subwoofer hum. I have a Sunfire MK II subwoofer that hums when it is plugged in (it even hums when no signal is connected). I've tried multiple outlets on different circuits, but hum...


you have a ground loop issue you could purchase a ground loop isolator, jensen makes them for about 40 bucks.I have discovered that if you have cable tv, unplug the incoming cable in your cable box and see if hum disappears.

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1 Answer

My home theater speakers make a constant hum whenever my receiver is on. The loudness of the hum changes with the volume control, and goes away entirely when the system is muted. All components are plugged...


jd40,
Sounds like a grounding issue. The first two places to look into is the powered subwoofer and antenna. During your last test, did you leave the FM antenna and subwoofer connected? Many times the hum is directly related to the antenna and/or the subwoofer and to how they are grounded; creating a ground loop through the receivers ground on the outlet. If the antenna is grounded to the dwellings wiring, hum is inevitable and sometime you can get a ground loop hum from how or how & where the subwoofer is grounded. Try taking them completely out of the loop.

Also try taking it further back to the basics, start with the receiver plugged into a known good grounded outlet with no surge or line conditioner in the loop and nothing connected to the receiver, nothing. Use one speaker and different wire to test each speaker output while in tuner and any other mode but phono. With no signal, you will either get nothing (no hum or static) or just static in the tuner mode. No hum is a good sign. Some systems will mute the speakers if no signal is connected to eliminate the static from being produced through the speakers but a ground loop hum will most likely still be produced even in mute. If you get a hum when nothing is connected to the receiver, try looking into getting a better grounded outlet, even maybe to a different dwelling.

-Chris

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1 Answer

I have a sub woffer JHT525 that bega humming. I have checked the fuze and did some reconnections but it is still humming. Anu suggestions? Anyone know where I can get a replacement. The model is JHT525


Disconnect everything, and turn it on. If it hums, it needs repair. Then try hooking up one cable at a time. If a connection hums, try another cable. If it hums no matter where you plug it in, try a 2-prong power plug adapter, or a ground-lift plug, as it's called. If nothing works, it may need a repair in its power supply. It would still turn on, but buzz no matter what you connect.

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1 Answer

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Sounds like the hum might be mains hum caused by the failure of the power supply capacitor(s) in the sub. It/they will be the largest on the pc board. You will find all the details (needed to replace it) on them. If you find more than one replace both.

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1 Answer

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Nakamichi service center in New Delhi. call +91 9871371720

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My 05 Corolla stop running.


Sounds like you need a fuel pump. The first indication of a fuel pump issue is a hum or drone noise.

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2 Answers

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your circuit board is bad not repairable i have the same prob but not kenwood they said it would cost more then its worth.






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