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

lol, posted it up already haha... was it my ksc-75? or urs?

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

i dun think theres really much of a difference la, unless u didnt put them back properly, it would probably be the same. i might need some 3.5mm to 3.5mm cables from you some time soon, oh ya, and my hp890 plug also cacat.. might need some plugs as well.

u really haf much time eh, hows the pimeta parts of yours ler?

BTW, impedance is real+imaginary resistance in freuqency domain, measuring via multimeter alone do not suffice.

PCwork is really free ma... Btw, he still own us something...

own or owe? owe what?

Not u la. It is TS.

What is TS?

all i can say is.....CONGRATS!!! to brader PCdude!! certainly a job well done above and beyond duty! Malaysia Boleh!! (thxs god brader PCdude doesnt belong to team NATO!!! )

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

wah lau you the l33t lar! (no pun intended). Even I dun have the ballz to mess with voice coil...well actually I have no ballz to actually disassemble the whole driver since it is a very delicate thing and the process calls for significant amount of patience (what I don't have) and precision (although I have this ).

The soldering point has lots of craps eh...go pharmacy and pick up some 99% alcohol and clean it with a Q tip, and it'd look as good as new.

This post has been edited by AlamakLor: Jul 6 2007, 09:26 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

I can't do that, once I work on something I'd want to get it done the same day or I'll feel very uneasy and suffer from insomnia. which is why multiple stage process thingy is not quite my thing.

PcWork.. i think u did it in a day as well right? called me in the night and told me u were attempting to do it... then an early message sms said u did it

anyways.. good job

i really really really understand how u feel about this
it really makes u insomniac having something hangging over ur mind when its incomplete.

Hurry up and do my amp already... I need to get that back before I go to australia =P

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

New Recabling version for KOSS KSC75 from our BRO PCWORK also known as KOSS KSC75v3 Pcwork Edition

below the the link for some pics

http://forum.lowyat.net/topic/274651/+1200

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

OMFG
i dun think any 1 in m'sia can reach ur level of fixing driver?
yesterday when i was there u show me how small is the voice coil
n i did said like imposible to do it...
then now u fix dy
wat else i can say....
totaly

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

Cannot believe what you did man, seems is already over haha

Then next time ask you to fix all the tiny tiny earphones......haha not only specialist in cable and also earphones/headphones...

Hehe well im really speechless looking at those pic .. too amazed to say anything

This PCdude is really professional

PCdude...brader, you've done it again! i dont know how u can handle something so small and more importantly, so fragile! a job well done although why anyone wants to repair mx300 is beyond me! isnt the mx300 one of those use once and dispose typa thingies???

ps:i wouldnt worry about LYN hi-hands bud. the only thing alot of ppl are hi on is either glue or team NATO! or maybe both...M'sia Boleh!

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

go without fear n care free
coz i'm here gonna rape ur beast , muahahahahaha
jk
i'll just put there to collect dust
wait u back lo
have a safe n nice trip
even in the estate also take good care lo , coz might b some bear come attack u or rape u, who know wat gonna happen there
take care XD

Just meet up with pcwork before he take KLIA Express Train.

Where's you guys' house. I gonna rob it since only one robocop guarding the house.

no a
still got Voltron, optimus prime, gundams, Cloud, Vash the stampete n etc guarding as well

lol
i think i have get extra lock

PcWork u elite lah. hoho. rock solid cool again. lol. later if my headphones got problem, im going to send them to PcWork phD.

off topic....just called him, he will be at the estate on monday haha, means now he at hometown liao....

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

sorry bro,

Mini steam iron or magic steamer..

bro, can u sell this item to me? pls..
pm me..

PcWork: i got a Apacer mp3 player.recently drop from table and got problem now. when playing music, one of the channel fine another channel no music, just "du du du" like oscilatting noise.

any idea on how to fix it?

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

crazy recable master!!!!!!

Walao, u change the mx300 cable..seem i see before the cable..if not mistake is the start with word of "C"

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 PcWork bro, u haven't told them this hybrid mx300 had already pawn what kind of other earbud (starts with P**)

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.

lol,u mean pk3?!
sure o not?
haha,but the thing mod by pcwork sure can bring out its total potential!

This post has been edited by TeOtq: Mar 21 2008, 01:33 AM

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.

depend of each people taste lo. myself get pk1 but need to amp it. so i think this should be very good. anyway will come to visit next month.

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

Hear it sounds similar to KSC75

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

i have a Mx400...meet up with u soon

Guys, i just meet up with Bro PCWORK and i tested his MX300 what i can say you need a amp to amped it but the SQ is very real and the soundstage is wider than i thought. similiarity is like a ksc75 non recable version. i may say the sound in between yuin pk3 this mx300 more wider soundstage. Good to have a listen/audition on it. Good Job PC BRO..........

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

bro i think the stiff only the cable. i having this issue so far. by the way nice to open it well i can see my yuin pk3 can change a cable when is broke later....nice picture haha...

Aww eye candy hehe... can see your finger print summore

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

yes i saw it really experiment haha...as long can take recable in future, yuin still alive then...

hehe,good to hear that,
my yuin pk1 n 3 can be recable in future ler!!

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?

lol, you always like that...easy to settle haha.. anyway is a good to hear that the yuin is a potential for upgrade the cable...

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

lao..always aim my toy at cheap price...@.@

but u never sell me leh...........
don't forgive u for not selling me mx500...

dun small gas ler..something wrong with the communication between us that make me thought u dun want the mx500..
no worry,if got good deal at singapore will let u knw.hehe

aiyo suddenly become a buy and sell thread aiya.....oops spamming..

no this is what i call threaten and ugut...

wrong account...

edited...

This post has been edited by matt2001: Mar 23 2008, 12:14 AM

today went to meet PcWork bro to repair my zen micro...it was the most eye ear opening experience i ever had in my whole life.there are so many things that PcWork bro showed me and i really could not believe what i was hearing back then.from the MX300 to his SUPER HP890 and KSC75...the secret amp and his pride of his life speaker... now,everything in my house feels so...boring

PcWork bro,thanks for teaching me so much.you really redefined the meaning of poison

ahem ahem... hahaha
u run so fast. else i got somethings else wanna show u..
u cannot tahan my 890 leg can open so wide????

yeah, PcWork is the man. btw, i tried to change drivers of my earphones last night, result is i spoiled 2 earphones at the end. Lesson of the story is: Never try this at home.

what is the earphone? and what did u spoil?
wanna hand over to have a check?
i am still in serdang.

Both in-ear headphone, one Senheisser, another is AudioTechnica (suspect is imitate).

The thin wire from the coil of the driver is disconnected from the headphone cable. very serious injury i think.

one more faulty Apacer player, one channel no sound the other one got sound.

When will u leave serdang?

u just call me up
since the earphone is died, do let me have some experiment on it.. i MIGHT , only might able to repair it...
019-8844337

lol, is time ask sifu lae...wui223 what model you get forAudio Tehnica??

ATH-CK5 but i suspect is fake one coz price is like 40 bucks at The Curve.

Hehe not bad bro at least u have the courage to open them up and try

p/s Btw, already ending sem, but haven't met you yet Gd luck in the coming exam on tuesday

LOL victor
like wat i said
audiophile is not wat u think so easy 1
i like Peter's speaker to
the damn EPOS
i go back hear my set is like so plain after audit at his place tat day

time to upgrade eh coolerthings.. hahaa
now i try to mod my NAD to sound as close as epos.. at least hopefully as warm.

keep upgrade haha...never ending...that what we called Hifi..

PC work.... u got fix Mp3 player ???

I got 2 Mp3 player cant play dy....just left it there only....wanna try to revived it ...

haha,i think pcwork do repair anything that related to audio..

Then Good lar....can help me fix ar PCwork???

One is Creative Zen Micro that i abandoned it for a year mayb...

Another one is a korean Sign brand mp3 year which abandoned it for 3 or 4 yrs

too bad i can't repair ear..
and most of the amp / CDP is too complicated to me.
i have not much of electronic knowledge. but with skill of hand to perform stable tiny soldering only.

AWWWWWWWWWWWWWWW..............

after hours of operation, i finally opened up the YUIN PK1 WITHOUT ANY visible scratch.. hehehehe
phew.....

see the white / blue glue, that's is as strong as elephant glue... even more stronger as it is not "crunchy." it stick really strong, yet slightly elastic.. some more the plastic of PK1 is seriously soft.. user are advised not to perform this on ur own. do it at ur own risk.

now is the easy part to recable it and snap it back using some UHU glue. next time this particular pk1 is much easier to open back by UHU glue. =)

Bro scottie, i think i can send ur Sony and this Yuin to u by next monday.
this friday i have exam though (11th)

PCdude did it again! The impossible was done...

dude, u create another miracles, thks for the effort spent

btw, we do have the chances to recable yuin very soon
but i was told that it is extremely hard to open it, somehow the time need to be gam gam one...

really

Picture in attempt of recable Yuin Pk1.


Sony earhone recabled...another case of hardening cable, this goes extreme, driver is 16.6mm diameter. extreme bass. sweet mid. the whole cable gone stiff....



Cable soldering point were done as tidy as possible....


soldered on the YuinPK1


the size compare with my thumb..



Viola.. Yuin KSC-1? or Ksc-Pk1?
Koss - Pk1..
hahaha

Nice work!! The cables are so thin I cant imagine how you work with it.

Hats off to you.

actually those wire are consider big and easy to solder liao..
now i feel boring. opening up one Sennheiser Mx300 to play play..
see the voice coil?
i am actually soldering it. =)


MX300 with voice coil . on my Razer pro pad. anyone has the mouse pad can actually compare the size of voice coil with the logo on the propad. the metal stick besides is soldering lead i use to solder the voice coil. it's 0.8mm thick.


voice coil of mx300 besides my razer krait... krait look like a titanic to the voice coil. lol..



Enjoy~

Ever considered of being a surgeon?

stiching nerve fiber should be a piece of cake to you

hehehe. attached it already.. wanna go sleep liao. eye sakit.. =P