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Old 11th January 2007, 12:13 AM   #21
TOINO is offline TOINO  Portugal
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Well... I have the schematics kindly offered by another member but have not the complete service manual.
If you have it complete with Pcb drawings I will appreciate.
What I really need is the Crown Itech service manual. It seems that is impossible to found in this corner of the planet.

Your K2 is already repaired?
It is amazing how they do the amplifier without short circuit protection!
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Old 11th January 2007, 06:40 AM   #22
Vek
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Quote:
Originally posted by TOINO
It is amazing how they do the amplifier without short circuit protection!
Really, do they? I can't imagine a professional amplifier (namely from crown) out in the wild without at least this kind of protection! But since I have never seen the circuit diagram I'm not in the position to call this into question ... It just sounds weird to me.

But now to something completely different:
These amps seem to have an auto-standby function, switching the amp off when there is no (better: insufficient) signal and back on when there is sufficient signal. At low listening levels this feature becomes really annoying, the amp switches off at still audible levels.
Does anybody of you know the trick to disable this, perhaps a jumper somewhere inside the amp?
The manual don't even mention this feature! (AFAIR)

Any hints from the service manual owners?

Cheers, Ralf
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Old 11th January 2007, 11:39 AM   #23
mrx23 is offline mrx23  Hungary
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Plase send me to the manual
jani2005 dot citromail dot hu
Thank you!
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Old 11th January 2007, 12:25 PM   #24
TOINO is offline TOINO  Portugal
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Hi Vek

It is not completely unprotected but it is near the same. They have a kind of “current Limiter” after the power stage.
The output power stage is not directly and real-time protected as it should be.

About the “self stand-by” feature I have not adequate amount of information to help you. Sorry…
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Old 11th January 2007, 03:10 PM   #25
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I can send the service manual... Anyone who wants it, let me know your email.

Also I believe Crown will soon be posting the manuals on their site, since they discontinued the K series this past Summer.

And yes, you can disable the standby, but i don't recommend that. You can change R15 on the input module to 845K and you will get 56 seconds of delay instead of 6 seconds.

The next issue I'm up against is getting some replacement FETs. The Fairchild FQP16N25C is what I ordered, hopefully it will work. Crown matches the transistors for gain and other specs, but they want over $6.00 each for them. That would be over $50 for one output module worth of transistors that I risk blowing up again if something else is wrong.
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Old 11th January 2007, 03:21 PM   #26
Vek
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Quote:
Originally posted by Maxxarcade
I can send the service manual... Anyone who wants it, let me know your email.
I'm very interested, perhaps I can find some clues to solve my little issue there!
Please mail to: ral.sim@web.de

Thanks very much!
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Old 11th January 2007, 03:22 PM   #27
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I'm also interested in K2 service manual
lumanauw@bdg.centrin.net.id
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Old 11th January 2007, 03:44 PM   #28
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Sent Guys... Let me know if you get the file.

Too bad I can't just upload it to the forum, hopefully Crown will post them soon.

EDIT: I'm getting the emails back... file is too large :-( Hmm...
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Old 11th January 2007, 05:04 PM   #29
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Got it, thanks
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Old 11th January 2007, 05:07 PM   #30
Vek
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Quote:
Originally posted by Maxxarcade
EDIT: I'm getting the emails back... file is too large :-( Hmm...
How big is it? Must be some MBs...

Perhaps zipping the file would bring it a little bit down in size.

Another possibility would be to upload the files somewhere and send us the link by PM
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