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
|
|||
|
|||
1 inch speaker problem
Nastly little magnetic tweeter/mids ?
As a 47uF NP cap is over one, for mid? Anyway nasty buzzing overtone as though a bit of steel swarf or staple has got on the cone of a larger speaker. These things have brushed aluminium inverse dome covers on them, do they work loose, swarf dislodged inside? Of course close-handling has "cured" the problem, but bound to return without proper treatment |
#2
Posted to sci.electronics.repair
|
|||
|
|||
1 inch speaker problem
"N_Cook" wrote in message ... Nastly little magnetic tweeter/mids ? As a 47uF NP cap is over one, for mid? Anyway nasty buzzing overtone as though a bit of steel swarf or staple has got on the cone of a larger speaker. These things have brushed aluminium inverse dome covers on them, do they work loose, swarf dislodged inside? Of course close-handling has "cured" the problem, but bound to return without proper treatment I take it you mean a **** hi-fi speaker with a one inch voice coil. Have you checked it's not a Surround problem? i.e. the attachment to the outer rim of the chassis has failed. Or sometimes the dustcap itself comes loose and rattles. Or sometimes the bottom spider suspension becomes detached from the inner part of the chassis. But mostly its because the owner has blown it, and there are burnt or loose pieces of voicecoil rubbing intermittently. You might also check that the magnet hasn't become partially detached from the chassis. That's a good one for a pub story. All the above much more likely than an otherwise foreign body entering the gap. In my experience. Gareth. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
1 inch speaker problem
"N_Cook" wrote in message ... Nastly little magnetic tweeter/mids ? As a 47uF NP cap is over one, for mid? Anyway nasty buzzing overtone as though a bit of steel swarf or staple has got on the cone of a larger speaker. These things have brushed aluminium inverse dome covers on them, do they work loose, swarf dislodged inside? Of course close-handling has "cured" the problem, but bound to return without proper treatment You also might want to remount said speaker with that recommended to tighten cylinder head bolts, so it's flimsy chassis does not warp in the process. Though I would guess you are very aware of this method already. https://www.google.co.uk/search?q=cy...eKKobbU8r1oIgO Gareth. |
#4
Posted to sci.electronics.repair
|
|||
|
|||
1 inch speaker problem
On 19/01/2016 20:54, Gareth Magennis wrote:
"N_Cook" wrote in message ... Nastly little magnetic tweeter/mids ? As a 47uF NP cap is over one, for mid? Anyway nasty buzzing overtone as though a bit of steel swarf or staple has got on the cone of a larger speaker. These things have brushed aluminium inverse dome covers on them, do they work loose, swarf dislodged inside? Of course close-handling has "cured" the problem, but bound to return without proper treatment I take it you mean a **** hi-fi speaker with a one inch voice coil. Have you checked it's not a Surround problem? i.e. the attachment to the outer rim of the chassis has failed. Or sometimes the dustcap itself comes loose and rattles. Or sometimes the bottom spider suspension becomes detached from the inner part of the chassis. But mostly its because the owner has blown it, and there are burnt or loose pieces of voicecoil rubbing intermittently. You might also check that the magnet hasn't become partially detached from the chassis. That's a good one for a pub story. All the above much more likely than an otherwise foreign body entering the gap. In my experience. Gareth. So far, 3 pages worth of images, I've not found any replacement ones available anywhere, 4ohm, presumably about 3W, actually 30mm not 1 inch diameter. So I'll unglue them and see what I can see |
#5
Posted to sci.electronics.repair
|
|||
|
|||
1 inch speaker problem
First time I've been hands on these sorts of speakers. Tinsel wire
pigtails are more circumferential rather than large speaker more axial/radial but evenly spaced so unlikely knocking against VC or surround, but I may decide on a dab of lacquer on those in case they are resonating in use and then touching, well hardly hifi speakers anyway. 26mm diameter metal part 31mm diameter plastic surround for the suspension and onward fixing. The glue may have softnened holding hte plastic surround into the body of the donut as very easy to remove, so hotmelt will go in there on replacement. Also one of the little crimp shoes came off very easily. I'll swap over the "mid" and "treble" ones, both 4R in series , so 8R to the amp , but 47uF over one of them. Amp is little fine pitched leadout flip chip for 4R bass speaker and 2x2 of these little speakers, bolted to a little vaned heatsink There is no slot in the magnet, just a cup it seems, so unlikely the VC is rubbing on anything and seems good bond to the cone/dome sounder section. Suspension looks good. I'll give a blast through with 1KW Martindale blower , hopefully dislodge any swarf inside the magnet cup and hope they survive that as still no like for like replacements found. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
1 inch speaker problem
I've decided it is pigtail problem. Looks as though they've taken up an
unpowered position too close to the periphery plastic. Bent them all away from it and added a dot of lacquer on the terminal end of each pigtail, hopefully stopping the tails setting themselves back again. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Marshall MBC115 15 inch speaker lump | Electronics Repair | |||
External speaker plugged into 12 inch analog tv | Electronics Repair | |||
DEWALT D51430 Heavy-Duty 1-Inch to 2-Inch 16-Gauge 7/16-inch Medium Crown Stapler | Home Ownership | |||
Need 3 inch (76mm)/1 Watt/8 Ohm speaker replacement | Electronics Repair | |||
Repairing a Celestion 15 inch speaker? | Electronics Repair |