Author Topic: Strange "THUMP" when cut is pressed SOLVED (Read 5003 times)

jwhmca · « **on:** February 16, 2016, 07:00:31 AM »

4k 611 channel that does this strange "thump" when you press cut...?

StarF666 · « **Reply #1 on:** February 16, 2016, 07:20:04 AM »

Is the channel working apart from that?

jwhmca · « **Reply #2 on:** February 16, 2016, 07:22:59 AM »

yes, channel is working fine.

StarF666 · « **Reply #3 on:** February 16, 2016, 08:37:42 AM »

I guess you should try the usual routine, switch modules with spares or working channels. Start with the input card, that is where the channel is muted. I had this on some channels they always had other faults, mostly on the input card. Try to isolate the problem by switching off dynamics/EQ/insert/phantom. Is it on all inputs (mic, line, group) and in any status (VCA to monitor?)?

waltzingbear · « **Reply #4 on:** February 16, 2016, 06:19:33 PM »

most probable cause is dc offset at the FET switch, ie leaky cap or bad chip.

Alan

pascal.verdet · « **Reply #5 on:** February 17, 2016, 09:02:49 AM »

I confirm. I agree with Alan.
Cheers,
Pascal

jwhmca · « **Reply #6 on:** February 17, 2016, 06:11:09 PM »

Bad solder connection on random resistor...

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