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Tosumi stb01 My freeview receiver has suddenly stopped producing any volume - I can listen through my 'loop' system - so there is some volume there somewhere, I can also hear thro my tv receiver - can you help please? Wendy Barker wendybarker1@talktalk.net

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Is this like your unit? Don't you have the vbi teletext support on your freeview receiver?

Check here:

http://www.247electrical.co.uk/epages/twentyfourseven.storefront/48286d43011507e2273f0a020f020539/Search/Run

Posted on May 12, 2008

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Suddenly yesterday this equipment stopped producing any sound. Not even on the TUNER option. Usually it receives sound from a satellite receiver also. Now it is mute. It is connected to a pair of JBL H-F...


Hi,sorry for my dumb question...is your receiver 's "MUTE" switch is ON or OFF ? because your description relates directly to this feature..if it is on make sure you switch it OFF but before doing this pls make the volume minumum..
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Volume not function.


You need to be a bit clearer on the exact nature of the issue.
Please include if the unit was working and suddenly stopped producing sound (ie - speaker output fuse blew) or if you relocated the unit, and after hooking it back up, you aren't getting any sound (ie - not hooked up right) or if the volume knob isn't changing the readout for the volume level (logic or knob broken) - and also include the make and model of WHAT the volume knob is attached to (ie - Yamaha receiver model X)

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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.

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Suddenly, amplifier stopped giving out sound. Controls and display seem to work fine. If it is blown fuse, where is it & how can i replace it?


Does it stop on both channels? It sounds to me like the safety circuit is activating. This usually happens when either the volume is too high, or the speaker load is too great (i.e. usually loads less than 4 ohms will do this) or, the amplifier has an internal short causing the amplifier's output stage to become un-balanced. Does the sound come out nice and clearly through both channels? How long does the receiver play before the sound stops? How loud are you playing the music when it stops like this? If the sound is reasonably clear through both channels at regular volume, then there is probably nothing at all wrong with the receiver's output circuits. If the amplifier is being played at regular volume or even lower volume for quite a while and then quits, perhaps the receiver is getting too hot and it's thermal sensors are activating the protection circuit. Make sure that when you operate the receiver, that there aren't things laying on top of it blocking the unit from venting and cooling properly. Make sure it has plenty of breathing room - amplifiers (most of them anyway) are inherently subject to producing heat. If the amplifier only quits when played at high volume, well then that's probably the problem - it's probably not meant to deliver such power that you're asking it to - especially if you're driving a heavy load such as 4 ohms or less. If you're running several speakers on this unit, try scaling back to just two speakers for now, and make sure these are 8 ohm speakers. Play the unit for a while and see how it does.

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you should have it repaired.the audio circuit is malfunctioning because of the sudden burst/surge of current.

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This aeems to be a dud device return to seller or Philips

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