Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
Hi
I have a weird speaker problem. These are the speakers of a mini stereo system. The speakers are kind of old. We are talking 10+ years. Generally they work fine. But if I somehow touch/move the table where they are resting, they turn off. Nothing I do (shake, move, vibrate) wil make them turn back on. But if I just turn up the volume, eventually they come back to life. I can lower the volume back to its former level and they continue working normally like nothing happened. What could it be? Other than that, the speakers sound fine. I thought about a loose/broken wire somewhere but I do not see how turning up the volume would fix it in such a way that lowering back the volume does not "unfix" it. It seems too weird even for google. |
#2
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
On 2012-02-24 07:59:10 +0100, pepebuho said:
Hi I have a weird speaker problem. These are the speakers of a mini stereo system. The speakers are kind of old. We are talking 10+ years. Generally they work fine. But if I somehow touch/move the table where they are resting, they turn off. Nothing I do (shake, move, vibrate) wil make them turn back on. But if I just turn up the volume, eventually they come back to life. I can lower the volume back to its former level and they continue working normally like nothing happened. What could it be? Other than that, the speakers sound fine. I thought about a loose/broken wire somewhere but I do not see how turning up the volume would fix it in such a way that lowering back the volume does not "unfix" it. It seems too weird even for google. surely bad contacts in the volume potentiometer... a current problem ... change the potentiometer if possible, of use a contact spray -- ---------- Kripton the ESR Repository @ http://kripton2035.free.fr/esr-repository.html the Geiger Repository @ http://kripton2035.free.fr/geiger-repositor.html |
#3
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
On 24/02/2012 06:59, pepebuho wrote:
Hi I have a weird speaker problem. These are the speakers of a mini stereo system. The speakers are kind of old. We are talking 10+ years. Generally they work fine. But if I somehow touch/move the table where they are resting, they turn off. Nothing I do (shake, move, vibrate) wil make them turn back on. But if I just turn up the volume, eventually they come back to life. I can lower the volume back to its former level and they continue working normally like nothing happened. What could it be? Other than that, the speakers sound fine. I thought about a loose/broken wire somewhere but I do not see how turning up the volume would fix it in such a way that lowering back the volume does not "unfix" it. It seems too weird even for google. It's a high resistance contact somewhere. You haven't given enough information for a more accurate diagnosis but my guess would be that there is an output relay or a connector with either tarnished or worn (low pressure) contacts. Turning up the volume allows the increased voltage to break down the insulating layer for a while. Giving a make and model might be helpful Ron |
#4
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
On Feb 23, 10:59*pm, pepebuho wrote:
Hi I have a weird speaker problem. These are the speakers of a mini stereo system. The speakers are kind of old. We are talking 10+ years. Generally they work fine. But if I somehow touch/move the table where they are resting, they turn off. Nothing I do (shake, move, vibrate) wil make them turn back on. But if I just turn up the volume, eventually they come back to life. I can lower the volume back to its former level and they continue working normally like nothing happened. What could it be? Other than that, the speakers sound fine. I thought about a loose/broken wire somewhere but I do not see how turning up the volume would fix it in such a way that lowering back the volume does not "unfix" it. It seems too weird even for google. You may be jumping to conclusions. Is the entire stereo sitting on the table or are just the speakers? If the entire stereo is sitting on the table, then I agree with the other poster that th volume control wiper may not be making good contact. When you hit the table the wiper may move over a dead spot on the pot. |
#5
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
It is a Panasonic SA-AK15 mini system. The body (cd changer, tape
deck, tuner) is on a shelf and the speakers (two) are hooked through long cables on another shelf, atop my bed headboard. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
Weird speaker problem
On 25/02/2012 07:10, pepebuho wrote:
It is a Panasonic SA-AK15 mini system. The body (cd changer, tape deck, tuner) is on a shelf and the speakers (two) are hooked through long cables on another shelf, atop my bed headboard. If, after a couple of second after you switch the unit on, there is a quiet mechanical click. that would indicate a relay (which generally isolates the speakers). That would be my first port of call, checking for low contact pressure or tarnished contacts. Tapping this relay often provides a clue. If the fault always occurs on both channels simultaneously, then I would suspect that the relay isn't the cause It's easier usually to replace the relay than fiddle around trying to improved the contact arrangements. I would inspect any ribbon cables especially the flat 'printed' type for tarnished contact areas on the ends. Another area in which it might be fruitful to look, is any mechanical push switches, tho these are becoming rare on modern equipment. The other possibility is a dry joint (cold solder joint), which would probably be anywhere in the signal path after the volume control, and somewhere common to both channels. HTH Ron |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Laptop to powered speaker problem | Electronics Repair | |||
GE Cordless Phone Speaker Problem | Electronics Repair | |||
Speaker problem | Electronics Repair | |||
Weird RCA TV Problem | Electronics Repair | |||
Weird A/C problem | Home Repair |