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CM300 excessive mic gain
Posted: Tue Mar 22, 2011 6:06 am
by arlojanis
I have a CM300 that has very high mic gain. I reset mic gain in CPS to 1.5 and mic picks up a whisper 3 feet away. When I set mic gain to a high setting there is a lot of back ground hiss and more mic gain. PL deviation is normal. A new mic did not help. What else can I try?
Re: CM300 excessive mic gain
Posted: Tue Mar 22, 2011 3:02 pm
by 35echo
Arlojanis,
I would check the ASFIC voltages and signal levels. That IC has all of the gain and attenuation stages in it.
It is programmed by the micro according to customer settings and tuner values. I would also check U507.
I dont think it is the problem but you could have something seriously strange going on.
Regards,
Allen
Re: CM300 excessive mic gain
Posted: Tue Mar 29, 2011 10:02 am
by com501
If you have the capability, you might want to refresh the firmware also.
Re: CM300 excessive mic gain
Posted: Wed Mar 30, 2011 5:51 am
by arlojanis
Firmware upgrade did not help.