FoxSky

Member Since 12 Nov 2008
Offline Last Active May 19 2016 11:11 AM
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Posts I've Made

In Topic: CTS1200 Problem

21 March 2016 - 11:17 AM

I don't understand why CROWN Technical support don't help?

Send this amplifier to the trash?

In Topic: CTS1200 Problem

19 March 2016 - 12:20 PM

I got an update

I noticed that the same channel when loaded, feeding sine wave, I noticed that the THERM protection LED turns on quick, even the heat sink is not so hot, I even have the fans running on top of the heat sink for testing purposes.

I conducted a test on the working channel, forcing it to over heat, no fans used, THEN!!!! the working channel started to show the same effect!!! as of the faulty channel!!!

Image from the WORKING channel when loaded and forced to over heat

http://postimg.org/image/6i1l5ttq1/

in the image above, the voltage was 65V, when the channel over heated, voltage dropped to 35V, and the wave started to get bad.

Now I think that we know the problem is in the thermal control section?

Please advice

In Topic: CTS1200 Problem

19 March 2016 - 11:58 AM

I am not getting a better result by removing those resistors, except that the wave forms looks better, only clippling, no strange wave as before


Also, I am unable to get more than 35V at the amplifier output, See image for best wave clipping
http://postimg.org/image/wv6qijftz/

Another image when channel starts clipping
http://postimg.org/image/6mxl3kzuv/


Image at TP111 , looks strange

http://postimg.org/image/ip3zoimxx/


Image at TP211 looks good
http://postimg.org/image/wxtp4v78r/

This amplifier is driving me crazy, it gives 80V without load

Hope I get some more help

In Topic: CTS1200 Problem

17 March 2016 - 06:51 PM

WIill try this on saturday.

But compare what exactlly? and why Ch2? its already working!

In Topic: CTS1200 Problem

16 March 2016 - 09:24 AM

Hello


Yes, without load I am getting around 80V, same as the good channel.

No load

http://postimg.org/image/5zwc1pj07/

I checked all of the 0.68R resistors, All are good.

I am getting LOWER output voltage when i connect the load around 40V, see how the wave looks like with load

Loaded

http://postimg.org/image/7nhala319/

http://postimg.org/image/7nhala319/

The working channle gives around 67V at the same load clean sine


Hope i can solve it