how to repair a JBL 2416h-1?

[f***@intellitools.com]

Hi.

I have what appears to be a broken horn from my JBL speaker.
I'm pretty sure it's the horn 'cause when I swap in the horn from
other speaker, it works.

I am new to this. I've seen the terms Horn, Driver, and Diaphragm.
The horn is pretty obviously the bige flared thing that screws onto the
heavy round thing.

Is the Diaphragm and the Driver the same thing? Or is the Diaphragm
incorporated into the Driver?

And how would I go about replacing the diaphragm? And where can I get
one
for a good price?

Thanks so much,
fred

[Marc]

Post by f***@intellitools.com
Hi.
I have what appears to be a broken horn from my JBL speaker.
I'm pretty sure it's the horn 'cause when I swap in the horn from
other speaker, it works.
I am new to this. I've seen the terms Horn, Driver, and Diaphragm.
The horn is pretty obviously the bige flared thing that screws onto the
heavy round thing.

A+

Post by f***@intellitools.com
Is the Diaphragm and the Driver the same thing? Or is the Diaphragm
incorporated into the Driver?

b+ for good thinking,

Post by f***@intellitools.com
And how would I go about replacing the diaphragm?

again A+

And where can I get

Post by f***@intellitools.com
one
for a good price?

look @ the jbl site to find a dealer, open driver, take out diaphragm,
look @ numbers order, replace ( carefull delicat!) remount reblow :-)


look here if your part is in it

http://www.jblproservice.com/pdf/Misc.%20Parts%20List/04%20Misc%20Parts%20List.pdf

if not look here

http://www.jblproservice.com/service/index.html

or if out US

http://www.jblpro.com/pages/contacts/intdist1.htm

Post by f***@intellitools.com
Thanks so much,
fred

[k***@gmail.com]

One VERY important note that was forgotten!!!!
Be EXTRA careful after removing the old diaphram. The driver itself
houses a powerful magnet. When you set down that magnet, make sure
there is no chance of getting particles in the little grove that the
diaphram fits into. May be a good idea to place a piece of paper over
the magnet before setting down. Maybe some non residual tape! You get
the idea. Any nastyness inside that grove will most likely cause extra
wear on the coil of the diaphram and maybe sound really bad after
repair! This stuff is actually very easy, just be clean about it!
Good luck, you can do it!
Ken.

[George Gleason]

Post by k***@gmail.com
One VERY important note that was forgotten!!!!
Be EXTRA careful after removing the old diaphram. The driver itself
houses a powerful magnet. When you set down that magnet, make sure
there is no chance of getting particles in the little grove that the
diaphram fits into. May be a good idea to place a piece of paper over
the magnet before setting down. Maybe some non residual tape! You get
the idea. Any nastyness inside that grove will most likely cause extra
wear on the coil of the diaphram and maybe sound really bad after
repair! This stuff is actually very easy, just be clean about it!
Good luck, you can do it!
Ken.

be sure the clean the groove before re-assembly , even if you "think" it
is clean
some blotter paper soaked in 90% alcohol should do it
George

[f***@intellitools.com]

Everyone - thanks so much. I've got the daphragm apart from the
driver, and I can see what yumean about being delicate, and about
cleaning the groove.

Should the diaphragm by itself make a sound when connected, without the
driver? Just to be sure before I buy a diaphragm. This one is silent.

cheers.

[Marc]

Post by f***@intellitools.com
Everyone - thanks so much. I've got the daphragm apart from the
driver, and I can see what yumean about being delicate, and about
cleaning the groove.
Should the diaphragm by itself make a sound when connected, without the
driver? Just to be sure before I buy a diaphragm. This one is silent.

no it is not supposed to make sound when removed, there is no magnet
to push itself off from...

one could measure the resistance though

Post by f***@intellitools.com
cheers.

[George Gleason]

Post by f***@intellitools.com
Everyone - thanks so much. I've got the daphragm apart from the
driver, and I can see what yumean about being delicate, and about
cleaning the groove.
Should the diaphragm by itself make a sound when connected, without the
driver? Just to be sure before I buy a diaphragm. This one is silent.
cheers.

Diaphram will not make sound with out the magnet structure
you can test it with a ohm meter it should show 8 or 16 ohms(approx)
JBL uses the last letter to indicate the ohms
j & K I don't know which is 8 and which is 16
george

[Chad Wahls]

Post by George Gleason

Post by f***@intellitools.com
Everyone - thanks so much. I've got the daphragm apart from the
driver, and I can see what yumean about being delicate, and about
cleaning the groove.
Should the diaphragm by itself make a sound when connected, without the
driver? Just to be sure before I buy a diaphragm. This one is silent.
cheers.

Diaphram will not make sound with out the magnet structure
you can test it with a ohm meter it should show 8 or 16 ohms(approx)
JBL uses the last letter to indicate the ohms
j & K I don't know which is 8 and which is 16
george

G=4 Ohm
H=8 Ohm
J=16 Ohm

I don't think there is a 16 ohm 2416.



Chad

[Chad Wahls]

Post by George Gleason

Post by k***@gmail.com
One VERY important note that was forgotten!!!!
Be EXTRA careful after removing the old diaphram. The driver itself
houses a powerful magnet. When you set down that magnet, make sure
there is no chance of getting particles in the little grove that the
diaphram fits into. May be a good idea to place a piece of paper over
the magnet before setting down. Maybe some non residual tape! You get
the idea. Any nastyness inside that grove will most likely cause extra
wear on the coil of the diaphram and maybe sound really bad after
repair! This stuff is actually very easy, just be clean about it!
Good luck, you can do it!
Ken.

be sure the clean the groove before re-assembly , even if you "think" it
is clean
some blotter paper soaked in 90% alcohol should do it
George

Ant they are not self centering diaphrams, the need to be centered. An
expensive mistake if done wrong.

Chad

[jakdedert]

Post by Chad Wahls

Post by George Gleason

Post by k***@gmail.com
One VERY important note that was forgotten!!!!
Be EXTRA careful after removing the old diaphram. The driver itself
houses a powerful magnet. When you set down that magnet, make sure
there is no chance of getting particles in the little grove that the
diaphram fits into. May be a good idea to place a piece of paper over
the magnet before setting down. Maybe some non residual tape! You get
the idea. Any nastyness inside that grove will most likely cause extra
wear on the coil of the diaphram and maybe sound really bad after
repair! This stuff is actually very easy, just be clean about it!
Good luck, you can do it!
Ken.

be sure the clean the groove before re-assembly , even if you "think" it
is clean
some blotter paper soaked in 90% alcohol should do it
George

Ant they are not self centering diaphrams, the need to be centered. An
expensive mistake if done wrong.

Damn! Shows what you forget. I remembered them as being self-centering,
but I might have been thinking of another.....

Given the demonstrated level of the OP's technical know-how, I guess it's
probably useless to explain how to center up the diaphram.

Anyway...I always used a piece of painters tape, doubled back over a
business card (sticky side out) to clean out the gap.

jak

Post by Chad Wahls
Chad

[f***@intellitools.com]

OK, what is "centering", and how do I do it?

[Chad Wahls]

Post by f***@intellitools.com
OK, what is "centering", and how do I do it?

Do you have a sweepable frequency generator and a small amp?

Chad

[f***@intellitools.com]

No, but I could probably put my hands on one.

Does this involve acheiving the correct position of the diaphragm
relative to the driver? My diaphragm attaches to the driver with three
screws.

Post by Chad Wahls

Post by f***@intellitools.com
OK, what is "centering", and how do I do it?

Do you have a sweepable frequency generator and a small amp?
Chad

[Mike]

Post by f***@intellitools.com

Post by Chad Wahls

Post by f***@intellitools.com
OK, what is "centering", and how do I do it?

Do you have a sweepable frequency generator and a small amp?

No, but I could probably put my hands on one.
Does this involve acheiving the correct position of the diaphragm
relative to the driver? My diaphragm attaches to the driver with
three screws.

Here's the short version:
Apply signal (sine wave tone) to the driver.... Listen... Adjust
position till you don't hear any rubbing of the voice coil on the walls of
the gap.

Mike Borkhuis

PS - Please learn to bottom post and trim off the extra bits. Makes for
easier reading....

[Chad Wahls]

Post by Mike

Post by f***@intellitools.com

Post by Chad Wahls

Post by f***@intellitools.com
OK, what is "centering", and how do I do it?

Do you have a sweepable frequency generator and a small amp?

No, but I could probably put my hands on one.
Does this involve acheiving the correct position of the diaphragm
relative to the driver? My diaphragm attaches to the driver with
three screws.

Apply signal (sine wave tone) to the driver.... Listen... Adjust
position till you don't hear any rubbing of the voice coil on the walls of
the gap.
Mike Borkhuis
PS - Please learn to bottom post and trim off the extra bits. Makes for
easier reading....

Tighten screws lightly and sweep driver from about 250Hz on up, at a really
low level, listen for odd non sinusoidal tones. Tap driver so that it does
not do this, tighten screws some more repeat. If you still have sh*t in the
gap you will know it because it will never sound right.

After you are pretty certain that it is centered then sweep it through the
pass band at a pretty high level, I actually start lower, but be careful.

Also keep in mind that I can get my hands on a scalpel, that does not make
me a doctor. If you have hesitations take it somewhere, labor is cheaper
than another diaphragm, how did you get ahold of genuine JBL spare parts? I
need a source as dealers are not encouraged to really sell to the general
public, JBL can be quite picky about this.

Chad

[George Gleason]

how did you get ahold of genuine JBL spare parts? I

Post by Chad Wahls
need a source as dealers are not encouraged to really sell to the general
public, JBL can be quite picky about this.
Chad

or perhaps get the Radian replacement and get a diaphragms that doesn't
sound like a trash can lid hit with rocks
note I have no knowledge of the diaphragm in question my remark is
aimed at the horrible sounding 2450 JBL diaphragms
George