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Old 22nd August 2014, 01:04 AM   #1
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Default crown csl-800(pb2) noise from board

hi guys, im in the middle of fixing a crown csl800 amplifier that had a channel fully blown. it was outputing 50vdc always, it had almost every output transistor blown on that channel (i ordered parts to replace them all anyways). the drivers(to-220 transistors near outputs) where either shorted or one of the legs melted completely(replaced those too). also the r01 resistor between the base and emitter was burnt and some other small signal transistor were dead on the preamp board.

i have replaced a couple of parts, and now the amplifier will pass sound thru it, the issue now is that there is a high pitch sound when there is no audio input(or speaker connected to the amp) to the amp and if you hook up a speaker (8ohms) and some signal, the speaker will play what you give it without any distortion, but you can hear a high pitch version of the audio input coming from the pcb. it seems to possibly come from the big inductor right before the speaker output (L300). its important to note that the other channel is fully functionnal and does not do any of that.

but now i am out of ideas of what the problem could be, this is one of the first crown amplifier im fixing so i am not familiar with the design yet.
has anyone seen this before?could anyone point me in a direction that could lead me to find the problem?
any help is good help.
thanks!
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Old 22nd August 2014, 06:13 AM   #2
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Location: Dona paula, Goa
After you did the replacements, did you clean the pcb.

Gajanan Phadte
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Old 22nd August 2014, 11:16 AM   #3
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Quote:
Originally Posted by gmphadte View Post
After you did the replacements, did you clean the pcb.

Gajanan Phadte
This PCB was one of the cleanest I've ever seen in an amp. Literally no dust inside
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