This happen when i am hand itchy wanna recable Stax cable on my KSC75. and i carelessly wipe the voice coil with my soldering iron. hence the voice coil is detached from the terminal.. and it's burned..

therefore, i decieded to reattach the voice coil by opening it.


All things that i opened, including KSC75, Stax SR-X, Aego 2 Satelite driver.



Stax SR-X driver, the round things is membrane, while the gold colour places is stator.



Tachikoma's Aego 2 Driver
Magnet detached, voice coil dented.


Front view of Satelite, note that AEGO M no longer using this KOI audio's driver.
it's triangle eh.. =P




HERE COMES THE KSC75

Membrane, and the internal (magnet & Spider) of the driver.


Heck it's actually transparent..


It's still in perfect form (i didn't dent it) while i take it out.


Impedance test on the driver itself..
my multimeter has an error or +0.3 ohm
so the driver voice coil impedance is 58.3 ohm to be exact.
however, i assume that the terminal parts does provide some impedance to make it 60 ohm in total.



Successfully attached the voice coil back to the terminal.


Front look of the membrane after reattach back to the spider (housing)


Good things is after fixing the voice coil. the sound signature doesn't change at all. no distortion i can hear even amp it loud, really loud.
and it's still kicking hard on my head now.. nice.. =P
so hope this will let ppl know what is actually inside a KSC75. =)
enjoy pictures..


This post has been edited by PcWork: Apr 7 2008, 08:31 PM

Yours.. hahaha
that day no sound because i didn't connect it properlly.
and they are in a rush to going back. so i give u my spare driver. =)

and then i was hand itchy wanna put stax cable on it.. and i cough heavily while i solder.. and viola.. stax cable is connected, but not the voice coil. lol


so now.. no more re-cabling until i fully recover...
ur driver died twice (not twice actually, first time is careless mistake by not connecting it properly, which there's a tiny wire from the ground channel accidentally touched the signal channel. so sending everything back to ground, no sound. haha) . and it's kick hard on my head now.
wait u come, i let u test, see u can notice which side i repair by listening it or not..
but so far, myself and several of my audiophile friend cannot do that. =P

This post has been edited by PcWork: Jul 5 2007, 04:49 PM

lol
there's still a lot more things to learn.
pimeta is still half way built..

---

Added on July 6, 2007, 8:35 amthe repairing process only took me around 30 minute, with some time heavily coughing, lie down on bed, go toilet. =)


This post has been edited by PcWork: Jul 6 2007, 08:38 AM

very very tq for the suggestion..
will definately do it..

learn new things again today.. =)
haha. u definately can do it lah... just split them into different day loh. =) today take out membrane, tomorrow detach membrane from voice coil, another day to pull out the voice coil, and one more day to attach it..
=P
it's a matter you want or not only.


This post has been edited by PcWork: Jul 6 2007, 09:30 AM

u really jerk.. pushing me all around.
even i sick also ask me fast fast fast...

i know this is crazy.

akabane gaved me a MX300 which one side of the earphone has extremely low volume, and distorts when play.
therefore, i open it up..


the interior of MX300


and i found out that the problems is due to 3 factor.
1. the membrane is poked in, i don't know how they actually do this. perhaps heat.
2. voice coil is not align properly to magnet, hence the voice coil is actually touching magnet, and cannot move freely. and causing a lot of distortion, low volume.
3. the voice coil contact point to soldering place is oxidized.


after carefully poke out and reshape the membrane. here it goes..
=P according to sennheiser, the membrane is 5nm thick.

and i carefully pull out the voice coil...



reattach the membrane and voice coil back in to the spider and magnet.



another look of it. =)
and it's alive and kicking in my ear now. =P


This post has been edited by PcWork: Jul 11 2007, 09:08 AM

dude.. there's a lot of "high hand" (in chinese = sifu) in malaysia though....
who knows?
got ppl better, but not a LYN. the possibilities is very high.
i am sure if ppl like alamaklor willing to do it. he might do it even better. as his precision is better than mine..

This post has been edited by PcWork: Jul 11 2007, 11:36 AM

it's a learning process.
i am actually trying to repair some damaged headphone given by fren. however, i still needs more hands on "practical" before i actually operate on that headphone. i need to replace membrane of it.
however, even though MX300 is cheap. i appriciate it. and i don't like see any headphone within my hand is malfunction.

anyway. gtg to airport now.
see ya all around 29th.

wish me good luck, and have a successful trip. so that i don't have to rush other things when i come back. hence more time on can be spend on forum activities like surfing and gathering . lol



This post has been edited by PcWork: Jul 12 2007, 11:11 AM

opened up ipod shuffle for inspection.









still playing though, but the USB port cable had damaged. so it cannot charge/ detected by computer now.

take care of my things eh.. =~(
tomorrow have to enter mukah division. and have to sleep on floor... in estate barrack.

now my mind fully full with pressure from the project. and .. haih.. a lot of sosial communication with supervisor, worker, really afraid i cannot do this things well.. go there will sure kena shoot from head to leg, and.. afraid cannot rest enough, then after that going back to kl sure fall sick.. waste time.. yada yada...

only things make me happy is my zen micro is alive again with me, and i bring my recabled KSC75 + ath-ES7 from buddy scottie here...
ES7 will follow me anywhere i go.=)

This post has been edited by PcWork: Jul 14 2007, 05:51 PM

lol
just now a bit boring hand. so i did the following things.... =P
performance wise .. come and listen urself.




guess did i recabled???




u can come closer....




Closer.................




Whalah... i recabled mx300 that i used quite often.. very happy with it now.. =P

haha
cobra cable.. =P
but the improvement is obvious.. =P
wait u come and listen.

This post has been edited by PcWork: Mar 21 2008, 02:47 AM

lol
no no.. u shall come and listen baru u judge.
i talk only no use one..
else ppl can say me talk c0ck here.

i didn't say that
i only say this mx300 suit my taste more. =)
as this mx300 have really nice mid range after recable.
pk3 has better bass imho.

this modded mx300 need to amp also. as i run it usually with impedance adapter. to tune to the sound i want.

lol
wait akabane listen first tomorrow.
hahaha
i will say nothings on the sound quality. no comment..

the yuin pk3 is on my hand now.
haha
bass of yuin pk3 is more, has more quantity. but both same deep (same quality, same texture) i think
bass of pk3 is more fun.
but this mx300 is more balance on mid,. which from bass to mid it seems quite smooth. and mid on mx300 is really good after recable. =P

and akabane is right, the sound stage is really wide for an earbud. =P
positioning (stereo image projection) is quite well done by this recabled mx300.. =P


hehe
guess what is this?






it's PK3

due to the cable is stiff, (akabane, what else stiff ah??) so i take the opportunity to open it up. however, the whole process is PITA
as yuin glue the earphone with somethings as strong as ELEPHANT GLUE....



after more than half an hours i dissolve the glue, i finally take it out.


the sponge inside is very tidily fixed..




but due to the glue stick too hard, and the casing of the earphone is rather soft, on process open it up, i leaved a small scar at the earphone, though small but visible
though i already extremely careful and gentle on this one. however, i can't avoid that
i think the next one i do, i can minimize the scar.

another view



another view again.



the scratch is not visible from front..



now maybe i will figure out what cable will match yuin the most. =P

This post has been edited by PcWork: Mar 22 2008, 02:44 PM

lol
i use super macro mode.
u see first picture even got kulit mati leh.

lol... maybe i should play bad..
tell u that i can't repair the pk1 , then cheap cheap buy over ur pk1, recable and use myself..


good ideal huh?

wahahaha... teo.. wait ur pk1 wire stiff, sell me RM 100 ya...
or RM 50 oso can.. =P