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Patlover1983

Member Since 28 Jan 2011
Offline Last Active Oct 13 2014 04:02 PM
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Topics I've Started

Crown K2 runs very hot. Is this normal?

16 September 2014 - 03:16 PM

For a friend of mine i just repaired his Crown K2 amplifier.

Both output PWA's and the main PWA had several problems.

On the main PWA T1 was defective (short winding), some of the LM361 comparators where faulty and the 4 25v/100uf caps (near T1) where faulty.

The output PWA's had several components defective, like the FET driver and the optocouplers  Also at one side the isolator sheet had a small hole and the heatsink was short to chassis.

Resolve all problems and the amp is worked back again! But both channels are run very very hot when channels are been active. Even without load you burn your hand
after one hour. Is this normal? I never had an K serie amplifier on my workbench.
When disconnecting audio signal (or simply turn the gain pots at front back) the channels getting inactive and cool down. So this works like it should be.
Hope anybody with K2 experience can answer my question.

Powered by Crown app for Android

28 August 2014 - 04:32 PM

Don't know for sure where to post, but i have a software related question. Could it be that the 'Powered by Crown' app (that this time only is usable on an Ipad) is coming available for Andriod users? I have a tablet with Android so this could be nice!

Loud 'bang' heardible from channel A when turning on XTi4000

11 July 2014 - 05:05 AM

I have a problem with a XTi4000 amplifier from a friend.

When turned on the power, a loud 'bang' is audible from the speaker at channel A. For the rest it works fine. Channel B seems to work fine.

I have the same problem with a CDi4000 amplifier, this has this problem at channel B.
I opened a year ago a topic here on this forum but due to lack of time i never found out whats wrong with it.

It looks like the power supply is running fine. When turned on the amplifier one power supply rail (measured at the front heatsinks)
is low (around 28 volts) and the other rail (measered at the back heatsinks) is high (around 90 volts) but when the amplifier is getting
into the 'ready' mode this rail also dropped into low mode. I seen this beheavior at other XTi amplifiers so i think this is ok. Just to
find out if the tracker modules where OK.

When you shut down the amplifier and immidiatly switch it back on there is no 'bang' at channel A. When you shut down the amplifier, wait
until the voltage accross the 2 rails (measured at the heatsinks) is dropped until 3 volts and then switched on the power amp then the
'bang' is preset again at channel A.

I allready disconnect the front panel PCB, but this doesn't affect the problem.

Can anybody help me?

Where to buy Crown audio parts for Holland?

18 June 2014 - 01:26 PM

Hello Crown audio folks,

I have a question and hope some one can help me.For my crown amps (several XTi and CDi models) i need parts.

I contacted AudioXL in Belgium but this is not an option (anymore). I have tried several times to email and call but they are so slow (it took a month only to get pricing information and i recieve it only from some parts) i don't have the faith in it anymore. At this time they don't even communicate anymore with me! I need the amplifiers very soon.

Does anybody know a second address for buying crown amp parts?