R/E/P Community

R/E/P => Klaus Heyne's Mic Lab => Topic started by: Peller on April 27, 2016, 05:25:21 pm

Title: Fixing a stuck pad on a KM84?
Post by: Peller on April 27, 2016, 05:25:21 pm
The -10dB pad on one of my KM84s seems to be stuck in the 'on' position. The switch moves as it should, but there's no change in output level when switched.

Is this likely to be something I can fix myself, or should it be deferred to an expert?
Title: Re: Fixing a stuck pad on a KM84?
Post by: klaus on April 27, 2016, 06:52:59 pm
I am not yet accepting  your claim that the switch is stuck in the "on" position, unless you investigate further and measure functions and resistances (read below).

Open the mic, and observe whether the -10dB stalk is structurally intact. They sometimes break.
If is not broken, check that the stalk's rectangular contact, pressed into the opposite end of its actuator depression, touches and bridges the two spring-loaded contacts when you activate the switch function (upper position). If it mechanically touches, measure the resistance between the two spring contacts. If that shows open, clean the contacts on the mic amp and on the stalk. If it reads zero ohms, it's time to send it in.
Title: Re: Fixing a stuck pad on a KM84?
Post by: Peller on April 28, 2016, 03:30:49 am
Thanks Klaus, that's very clear and helpful.
Title: Re: Fixing a stuck pad on a KM84?
Post by: Benforesj on May 10, 2016, 05:25:19 am
I'm not surprised at all that we will talk about this together. I feel passionate about this.
Title: Re: Fixing a stuck pad on a KM84?
Post by: klaus on May 10, 2016, 09:40:06 am
Thanks, Chauncey!