SSlmixed.com Forum

Tech discussion => 4K,6K,8K Series => Topic started by: jwhmca on February 16, 2016, 07:00:31 AM

Title: Strange "THUMP" when cut is pressed **SOLVED**
Post by: jwhmca on February 16, 2016, 07:00:31 AM

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

Title: Re: Strange "THUMP" when cut is pressed
Post by: StarF666 on February 16, 2016, 07:20:04 AM

Is the channel working apart from that?

Title: Re: Strange "THUMP" when cut is pressed
Post by: jwhmca on February 16, 2016, 07:22:59 AM

yes, channel is working fine.

Title: Re: Strange "THUMP" when cut is pressed
Post by: StarF666 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?)?

Title: Re: Strange "THUMP" when cut is pressed
Post by: waltzingbear 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

Title: Re: Strange "THUMP" when cut is pressed
Post by: pascal.verdet on February 17, 2016, 09:02:49 AM

I confirm. I agree with Alan.
Cheers,
Pascal

Title: Re: Strange "THUMP" when cut is pressed **SOLVED**
Post by: jwhmca on February 17, 2016, 06:11:09 PM

Bad solder connection on random resistor...