--- In CZsynth@yahoogroups.com, "tomulcahy" <tomulcahy@...> wrote: > > If the buzz is there when you're not playing sounds, then it's not the DAC. It's some sort of grounding issue. Does it happen with the line output also? > > I've definitely seen the CZ-1000 service manual around for download, just can't remember where :( But I would say that you could safely refer to the CZ-1 service manual for DAC offset in the 101. > Thanks Tom. The hum in my CZ101 appears at both line out and headphone out. It is there when no sound is being played. It is not affected by the volume control. The level of the noise stays the same no matter where the volume control is set. I've tried changing the power supply to no effect. The noise seems to be made up of three separate frequencies. The bottom frequency appears to be AC hum. The next frequency is higher and is a buzzing sound. The highest frequency is an oscillating sound. Something interesting happens when I play a sound. Immediately after I release the keyboard key the middle frequency sound rises in frequency momentarily, then falls back to the original frequency. Any thoughts anyone,and thanks to everyone.
Message
Re: Any Mods to Make CZ101 Quieter
2009-10-06 by karl452055