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Class D Switching Power Amplifiers and Power D/A conversion

Crown CE2000 trippin'
Crown CE2000 trippin'
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Old 12th November 2013, 08:23 PM   #1
Chuppster is offline Chuppster  United States
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Default Crown CE2000 trippin'

I have a lovely Crown CE2000. It starts up great, 3 flashes on boot to indicate proper start-up sequence. However, if I turn the gain all of the way down, apply a weak signal, and then eek the gain up until I hear sound coming from my speakers, I hear a very distorted sound. If I take the gain any higher, the safety trips and the amp restarts.

With no load, the amp accepts a signal fine, and the clip light flashes at the appropriate level.

The failure was instantaneous. The amp worked fine one day and the next it is like this.

What is the most likely culprit in this situation? Bad power transistors?
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Old 12th November 2013, 08:49 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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This is class B.
Check the rails + & - 85Volts and that the centre voltage is zero +-20mV.
If there is a duff output transistor the fault would show all the time and your speaker would have been seriously damaged but check the triacs across the speaker terminals.
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Old 20th November 2013, 12:14 AM   #3
Chuppster is offline Chuppster  United States
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Okay, the triacs are fine in the board. After further examination R7 and R1 were both blown off the board. One is no longer connected the other is dangling. How much more down the line will likely be toast? Here's the schematics.
http://www.crownaudio.com/media/pdf/..._serv_revd.pdf
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