Crown schematic, anyone ?

A

Arfa Daily

Guest
Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there for
the other half of the amp, it appears to be an inrush thermistor, so I guess
whatever is short, must be south of that ...

Arfa
 
You can send an email to the Crown Technical department, the usually send the schematics to you.

Dan
 
<dansabrservices@yahoo.com> wrote in message
news:a92fdda7-65f2-44ec-ae8c-e11878ad4573@googlegroups.com...
You can send an email to the Crown Technical department, the usually send
the schematics to you.

Dan

Cheers Dan. I'll give it a go. I have to say though that over the years,
I've only had quite limited success prying schematics out of them ...

Arfa
 
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:7FMwx.59275$GG3.22269@fx10.am4...
dansabrservices@yahoo.com> wrote in message
news:a92fdda7-65f2-44ec-ae8c-e11878ad4573@googlegroups.com...
You can send an email to the Crown Technical department, the usually send
the schematics to you.

Dan


Cheers Dan. I'll give it a go. I have to say though that over the years,
I've only had quite limited success prying schematics out of them ...

Arfa

Well I never ! I asked, I got. Good call, Dan ! :)

Arfa
 
Arfa Daily wrote:

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there for
the other half of the amp, it appears to be an inrush thermistor, so I guess
whatever is short, must be south of that ...

** I found a nice pic:

http://www.musiker-board.de/attachments/crown_xls5000-005-jpg.84415/

The XLS series of amps use large, 240VAC rated PTCs for inrush limiting AND fault protection. Room temp resistance is a few ohms rising to over 12kohms when hot. Normally, the relay next door bridges it out soon as the DC rails come up.

The example I saw late last year was an XLS602 that would simply not switch on while the PTC was getting very hot. Like yours, you could variac it up to some extent, then the PTC detected a fault and went high.

Problem turned out to be the toroidal transformer, enamel insulation had failed in the primary winding creating shorted turns.



BTW:

Very sad to hear of George Cole's passing.



..... Phil
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:0cfd1989-afa9-4e30-85d0-0053392043eb@googlegroups.com...
Arfa Daily wrote:

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in
the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it
before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before
the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there
for
the other half of the amp, it appears to be an inrush thermistor, so I
guess
whatever is short, must be south of that ...

** I found a nice pic:

http://www.musiker-board.de/attachments/crown_xls5000-005-jpg.84415/

The XLS series of amps use large, 240VAC rated PTCs for inrush limiting
AND fault protection. Room temp resistance is a few ohms rising to over
12kohms when hot. Normally, the relay next door bridges it out soon as the
DC rails come up.

The example I saw late last year was an XLS602 that would simply not
switch on while the PTC was getting very hot. Like yours, you could variac
it up to some extent, then the PTC detected a fault and went high.

Problem turned out to be the toroidal transformer, enamel insulation had
failed in the primary winding creating shorted turns.



BTW:

Very sad to hear of George Cole's passing.



.... Phil

Yeah, I was very sad too, but he did have a good innings lasting until he
was 90. Dennis Waterman was still good friends with him as well. He's
looking a bit rough now, though ...

I saw every episode of Minder that was ever made. They all had very clever
'play on words' titles, and the first two series were actually quite dark
stories. They didn't think it was going to last beyond that, but the comedy
element was deliberately ramped up in the third series by the interaction
between Cole and Waterman, and it became an overnight success. I just loved
the character Arthur Daley for the wicked sense of comic timing and the
malapropism he employed. And of course, it was made by Euston Films, the
absolute kings of drama made in London.

Back to the crown. The transformers in this 5000 model are truly massive
torroidals, and I'm leaning towards suspecting shorted turns on the primary
of the one on the bad channel. The inrush thermistors are the size of penny
toffees - the biggest I've ever seen. From the sheet of flame that shot out
of this one and the number of bench fuses that blew, the short must be right
on top of the thermistor. The fact that you can only get to about 20 v of AC
input before the variac is jumping off the bench, also makes me think
shorted primary.

Unfortunately, it's not an easy task to get to the secondary side of the
PSU, as it's one of those two-board constructions, where one power amp is
stacked on top of the other, and all of the bridges and filter caps for both
amps are, needless-to-say, on the bottom board where you can't get to
anything.

Before going to all of the trouble to get the top board out to see if I can
unplug the tranny secondaries, I'm waiting on the shop getting in touch with
the owner to give him an estimate of what it might cost, depending on what I
find. I'm not sure what the spares position for Crown stuff is like here in
the UK, if it needed a tranny ...

Arfa
 
Arfa Daily wrote:

I just loved
the character Arthur Daley for the wicked sense of comic timing and the
malapropism he employed.

** Like: " The world is your lobster... "


Unfortunately, it's not an easy task to get to the secondary side of the
PSU, as it's one of those two-board constructions, where one power amp is
stacked on top of the other, and all of the bridges and filter caps for both
amps are, needless-to-say, on the bottom board where you can't get to
anything.

* You could snip the leads for the main secondary ( leaving the CT) and join them again if the tranny proves OK.


Before going to all of the trouble to get the top board out to see if I can
unplug the tranny secondaries, I'm waiting on the shop getting in touch with
the owner to give him an estimate of what it might cost, depending on what I
find. I'm not sure what the spares position for Crown stuff is like here in
the UK, if it needed a tranny ...

** Out of curiosity, I stripped down the tranny from that XLS602. Internal shorts in large toroidals are very rare, especially with no other fault.

The whole thing was rough as guts, with a wound core made from dozens of off- cuts of steel strip tacked welded together and bits of cloth tape covering the edges. Normal toroidal cores are precison made and have moulded plastic covers covering all sharp edges, where the primary is wound.

The twin 120/240 primary was bi-filar wound placing 120VAC between every adjacent turn, a dodgy practice at best and fatal if the enamel coating ever gets damaged.


.... Phil
 
Arfa Daily wrote:
** Out of curiosity, I stripped down the tranny from that XLS602. Internal
shorts in large toroidals are very rare, especially with no other fault.

The whole thing was rough as guts, with a wound core made from dozens of
off- cuts of steel strip tacked welded together and bits of cloth tape
covering the edges. Normal toroidal cores are precison made and have
moulded plastic covers covering all sharp edges, where the primary is
wound.

That's interesting. If this turns out to be the tranny, and the owner goes
ahead - assuming we can get one, of course - I will try to find the time to
have a look. Over the last couple of years, I've had probably three or four
large toroidals with shorted primaries, so maybe there's some Chinese
factory churning out cheapies like the one you saw, virtually made from
scrap ...

** The transformer maker used in the XLS series is:

" NRE Electrical Manufacturing Co Ltd ".

www.fsnre.com


( I posted the same details here on December 10,2014 )

BTW:

Is it possible the company is being run by a Mr Dai Lee ??




.... Phil
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:a33880be-d30a-4c3b-8d2d-3ec8cb434625@googlegroups.com...
Arfa Daily wrote:



I just loved
the character Arthur Daley for the wicked sense of comic timing and the
malapropism he employed.


** Like: " The world is your lobster... "


Unfortunately, it's not an easy task to get to the secondary side of the
PSU, as it's one of those two-board constructions, where one power amp is
stacked on top of the other, and all of the bridges and filter caps for
both
amps are, needless-to-say, on the bottom board where you can't get to
anything.

* You could snip the leads for the main secondary ( leaving the CT) and
join them again if the tranny proves OK.

Hadn't thought of that. I've got schematics for the thing, so shouldn't be
too hard to identify which wires are what. The primary is on a plug that's
easy to get to, and all is well with that pulled off, so nothing else on the
input board is the problem.


Before going to all of the trouble to get the top board out to see if I
can
unplug the tranny secondaries, I'm waiting on the shop getting in touch
with
the owner to give him an estimate of what it might cost, depending on
what I
find. I'm not sure what the spares position for Crown stuff is like here
in
the UK, if it needed a tranny ...

** Out of curiosity, I stripped down the tranny from that XLS602. Internal
shorts in large toroidals are very rare, especially with no other fault.

The whole thing was rough as guts, with a wound core made from dozens of
off- cuts of steel strip tacked welded together and bits of cloth tape
covering the edges. Normal toroidal cores are precison made and have
moulded plastic covers covering all sharp edges, where the primary is
wound.

That's interesting. If this turns out to be the tranny, and the owner goes
ahead - assuming we can get one, of course - I will try to find the time to
have a look. Over the last couple of years, I've had probably three or four
large toroidals with shorted primaries, so maybe there's some Chinese
factory churning out cheapies like the one you saw, virtually made from
scrap ...

The twin 120/240 primary was bi-filar wound placing 120VAC between every
adjacent turn, a dodgy practice at best and fatal if the enamel coating
ever gets damaged.

Yes, not a good practice for sure. I suppose though that it's hard to find a
way to wind a twin primary on a toroidal core where you're trying to keep
the profile low, and a similar level of core coupling from both windings.
Much easier when you have a traditional E-I core and can have two primaries
stacked on top of one another, I guess

Arfa
 
google images


https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=941&bih=428&q=Crown+XLS5000++wiring+schematic&oq=Crown+XLS5000++wiring+schematic&gs_l=img.12...5035.10827.0.13104.18.3.0.15.0.0.285.609.0j1j2.3.0....0...1ac.1.64.img..16.2.490.9r4x0TagNJ8#tbm=isch&q=Crown+XLS+5000+wiring+schematic
 
On Saturday, August 8, 2015 at 1:11:53 PM UTC-4, avag...@gmail.com wrote:
google images


https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=941&bih=428&q=Crown+XLS5000++wiring+schematic&oq=Crown+XLS5000++wiring+schematic&gs_l=img.12...5035.10827.0.13104.18.3.0.15.0.0.285.609.0j1j2.3.0....0...1ac.1.64.img..16.2.490.9r4x0TagNJ8#tbm=isch&q=Crown+XLS+5000+wiring+schematic

oooooooooooooooooooooooooooo


https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=941&bih=428&q=Crown+XLS5000++wiring+schematic&oq=Crown+XLS5000++wiring+schematic&gs_l=img.12...5035.10827.0.13104.18.3.0.15.0.0.285.609.0j1j2.3.0.....0...1ac.1.64.img..16.2.490.9r4x0TagNJ8#tbm=isch&q=Crown+XLS+5000+wiring+schematic&imgrc=FhvlCki_FhustM%3A
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:fa32623b-8488-42c9-93ae-e4db0ae15e34@googlegroups.com...
Arfa Daily wrote:


** Out of curiosity, I stripped down the tranny from that XLS602.
Internal
shorts in large toroidals are very rare, especially with no other
fault.

The whole thing was rough as guts, with a wound core made from dozens
of
off- cuts of steel strip tacked welded together and bits of cloth tape
covering the edges. Normal toroidal cores are precison made and have
moulded plastic covers covering all sharp edges, where the primary is
wound.

That's interesting. If this turns out to be the tranny, and the owner
goes
ahead - assuming we can get one, of course - I will try to find the time
to
have a look. Over the last couple of years, I've had probably three or
four
large toroidals with shorted primaries, so maybe there's some Chinese
factory churning out cheapies like the one you saw, virtually made from
scrap ...


** The transformer maker used in the XLS series is:

" NRE Electrical Manufacturing Co Ltd ".

www.fsnre.com


( I posted the same details here on December 10,2014 )

BTW:

Is it possible the company is being run by a Mr Dai Lee ??




... Phil

Today, having pulled all of the cabling out of the way, It was possible to
see where the secondary wires spaded onto the lower PCB, and there was just
enough room between the board stack and the cabinet side to mark them, and
pull them with a pair of long-nose pliers. I then shorted the blown-out
thermistor, and hooked up the variac again. Same as before. 20 volts of
input, and the variac is grunting fit to bust, so it does look like the
transformer primary is shorted turns, as that's now the only thing
connected. So now a case of seeing if we can get the tranny and inrush
thermistor, and more to the point, at what price ...

Arfa
 
Arfa Daily wrote:

Today, having pulled all of the cabling out of the way, It was possible to
see where the secondary wires spaded onto the lower PCB, and there was just
enough room between the board stack and the cabinet side to mark them, and
pull them with a pair of long-nose pliers. I then shorted the blown-out
thermistor, and hooked up the variac again. Same as before. 20 volts of
input, and the variac is grunting fit to bust, so it does look like the
transformer primary is shorted turns, as that's now the only thing
connected.

** Just as I suspected, those NRE toroidals are time bombs.


So now a case of seeing if we can get the tranny and inrush
thermistor, and more to the point, at what price ...

** Farnell have some 240V rated PTC thermistors that might do the job:

http://uk.farnell.com/epcos/b59810c0120a070/thermistor-ptc/dp/9753265?ost=9753265

Check the one on the other tranny to see what cold resistance value you need, probably something around 4 ohms.



.... Phil
 
Arfa Daily wrote:

** Just as I suspected, those NRE toroidals are time bombs.



It's inside a piece of heatshrink sleeve bigger than I've got to replace it
with, but on the blown out one, you can still read "4R7" so I guess 4.7 ohms
which would be about right. Assuming that they have it done, I suppose I
will have to get a length of suitable heatshrink in so that it's restored to
the insulation levels that it came out of the factory with.

** The shrink cover is there to retain bits if the PTC explodes and nearby wiring away when it "trips" - cos its gets so damn hot.

Be far better to slip a piece of silicone tube over the thing, as is often done with NTCs.


I was able to
just about get my meter across the bridges after the tranny wires had been
pulled, just to make sure that there were no issues with them or anything
south of them, but all looks ok, so I think that it is just the tranny
primary short circuit for no good reason other than it felt like it ...

** You gotta hope the new one does not get that same feeling, or the other one in the amp.

For my XLS602, I used a "pre-loved" toroidal tranny that was on hand, with a similar main secondary winding and added a small 18-0-18 E-core for the low voltages.

Might be smart to get a quote for a replacement tranny made to suit that Crown.



.... Phil
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:ca0a76d0-eb17-447c-be71-c0787909233e@googlegroups.com...
Arfa Daily wrote:


Today, having pulled all of the cabling out of the way, It was possible
to
see where the secondary wires spaded onto the lower PCB, and there was
just
enough room between the board stack and the cabinet side to mark them,
and
pull them with a pair of long-nose pliers. I then shorted the blown-out
thermistor, and hooked up the variac again. Same as before. 20 volts of
input, and the variac is grunting fit to bust, so it does look like the
transformer primary is shorted turns, as that's now the only thing
connected.


** Just as I suspected, those NRE toroidals are time bombs.


So now a case of seeing if we can get the tranny and inrush
thermistor, and more to the point, at what price ...


** Farnell have some 240V rated PTC thermistors that might do the job:

http://uk.farnell.com/epcos/b59810c0120a070/thermistor-ptc/dp/9753265?ost=9753265

Check the one on the other tranny to see what cold resistance value you
need, probably something around 4 ohms.



... Phil

It's inside a piece of heatshrink sleeve bigger than I've got to replace it
with, but on the blown out one, you can still read "4R7" so I guess 4.7 ohms
which would be about right. Assuming that they have it done, I suppose I
will have to get a length of suitable heatshrink in so that it's restored to
the insulation levels that it came out of the factory with. I was able to
just about get my meter across the bridges after the tranny wires had been
pulled, just to make sure that there were no issues with them or anything
south of them, but all looks ok, so I think that it is just the tranny
primary short circuit for no good reason other than it felt like it ...

Arfa
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:526df419-3f56-43a6-9f50-a34321526fd1@googlegroups.com...
Arfa Daily wrote:


** Just as I suspected, those NRE toroidals are time bombs.



It's inside a piece of heatshrink sleeve bigger than I've got to replace
it
with, but on the blown out one, you can still read "4R7" so I guess 4.7
ohms
which would be about right. Assuming that they have it done, I suppose I
will have to get a length of suitable heatshrink in so that it's restored
to
the insulation levels that it came out of the factory with.


** The shrink cover is there to retain bits if the PTC explodes and nearby
wiring away when it "trips" - cos its gets so damn hot.

Be far better to slip a piece of silicone tube over the thing, as is often
done with NTCs.

Thinking about it, you're probably right about the reason for the sleeve.
I'm sure I'll find something suitable.

I was able to
just about get my meter across the bridges after the tranny wires had
been
pulled, just to make sure that there were no issues with them or anything
south of them, but all looks ok, so I think that it is just the tranny
primary short circuit for no good reason other than it felt like it ...


** You gotta hope the new one does not get that same feeling, or the other
one in the amp.

Yes, that's what bothers me. I never like high cost repairs to older items
like this. It often seems to be the case that once they start failing, they
just carry on with a different problem each time, just inside the 3 month
warranty ...

For my XLS602, I used a "pre-loved" toroidal tranny that was on hand, with
a similar main secondary winding and added a small 18-0-18 E-core for the
low voltages.

Might be smart to get a quote for a replacement tranny made to suit that
Crown.

We got onto the people who handle Crown here today. They said that they
didn't do spare parts, but they did have a transformer. Ł100 plus shipping
plus tax. I suppose that's not a lot of money when you consider that it's a
custom four-winding thing the size of a baby's head, but still a lot to
shell out up front for a spare part. Considering the power output and
replacement value of this amp, even if the final repair bill weighs in
around the Ł200 mark, I suppose it has probably still got to be worth doing.

The customer has been given an estimate now by the shop, so we'll see what
he decides in the next few days, I expect ...

Arfa
 
"Arfa Daily" wrote in message news:58Mwx.110054$1h.1790@fx25.am4...

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there for
the other half of the amp, it appears to be an inrush thermistor, so I guess
whatever is short, must be south of that ...

Arfa






Hey guess what? Today I received a Crown XLS 602. (a baby by comparison)
And guess what? The mains Transformer is open circuit.

This TX is marked "NRE Electronics Manufacturing Co Ltd.
08/2006"

Dunno if that makes it from the same source or not.



Cheers,


Gareth.
 
"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:I4Lyx.120054$G13.70446@fx14.am4...
"Arfa Daily" wrote in message news:58Mwx.110054$1h.1790@fx25.am4...

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before
the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there
for
the other half of the amp, it appears to be an inrush thermistor, so I
guess
whatever is short, must be south of that ...

Arfa






Hey guess what? Today I received a Crown XLS 602. (a baby by
comparison)
And guess what? The mains Transformer is open circuit.

This TX is marked "NRE Electronics Manufacturing Co Ltd.
08/2006"

Dunno if that makes it from the same source or not.



Cheers,


Gareth.

Certainly the same as Phil's one. I don't know who made the one in my '5000.
There's nothing I can immediately see to identify it, but there may be
something when it's out - if of course the owner goes ahead. It's going to
need a pair of spanners big enough to take off tractor wheel nuts ... :)

Arfa
 
"Arfa Daily" wrote in message news:dkLyx.116774$tz.81613@fx02.am4...



"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:I4Lyx.120054$G13.70446@fx14.am4...
"Arfa Daily" wrote in message news:58Mwx.110054$1h.1790@fx25.am4...

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before
the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there
for
the other half of the amp, it appears to be an inrush thermistor, so I
guess
whatever is short, must be south of that ...

Arfa






Hey guess what? Today I received a Crown XLS 602. (a baby by
comparison)
And guess what? The mains Transformer is open circuit.

This TX is marked "NRE Electronics Manufacturing Co Ltd.
08/2006"

Dunno if that makes it from the same source or not.



Cheers,


Gareth.

Certainly the same as Phil's one. I don't know who made the one in my '5000.
There's nothing I can immediately see to identify it, but there may be
something when it's out - if of course the owner goes ahead. It's going to
need a pair of spanners big enough to take off tractor wheel nuts ... :)

Arfa





The customer said it had been in storage the past 2 years. He fired it up
today and it blew all the main fuses in his gaff.
So sounds like it may have been short like yours and Phil's, then blew open.



Gareth.
 
"Gareth Magennis" wrote in message news:qnLyx.273309$121.130462@fx19.am4...



"Arfa Daily" wrote in message news:dkLyx.116774$tz.81613@fx02.am4...



"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:I4Lyx.120054$G13.70446@fx14.am4...
"Arfa Daily" wrote in message news:58Mwx.110054$1h.1790@fx25.am4...

Anyone got the schematics for a Crown XLS5000 ? I'm most interested in the
board that the mains comes in to. There's a bloody great disc something
inside a big lump of heatshrink, and serious flames shoot out of it before
every trip and fuse in the workshop goes out ...

If I bring it up on the variac, I can't get beyond about 20 volts before
the
poor thing is jumping off the bench, so there's a good short on there
somewhere. I initially thought that the disc might be a big VDR that was
short, but looking up the part number on the second one that's on there
for
the other half of the amp, it appears to be an inrush thermistor, so I
guess
whatever is short, must be south of that ...

Arfa






Hey guess what? Today I received a Crown XLS 602. (a baby by
comparison)
And guess what? The mains Transformer is open circuit.

This TX is marked "NRE Electronics Manufacturing Co Ltd.
08/2006"

Dunno if that makes it from the same source or not.



Cheers,


Gareth.

Certainly the same as Phil's one. I don't know who made the one in my '5000.
There's nothing I can immediately see to identify it, but there may be
something when it's out - if of course the owner goes ahead. It's going to
need a pair of spanners big enough to take off tractor wheel nuts ... :)

Arfa





The customer said it had been in storage the past 2 years. He fired it up
today and it blew all the main fuses in his gaff.
So sounds like it may have been short like yours and Phil's, then blew open.



Gareth.





Er, except customers tend to lie a lot.

He may have tried to boot several times with various size fuses/paper clips
etc.


Gareth.
 

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