Yamaha CS80

I’m keen to know where the grounds should be linked. I’m seeing the M card ground is 0.3 ohm with respect to the logic power ground, but around 2k to the +/-15V ground. I’m guessing that shouldn’t be the case?

Lucid. 

From: mailto:yamahacs80@yahoogroups.com 
Sent: Wednesday, March 15, 2017 4:03 AM
To: mailto:yamahacs80@yahoogroups.com 
Subject: [yamahacs80] One more thing...

  

Hi Lucid Sound,




I remember that in the case i mentioned, some of the voltages I measured would change unexpectedly when I played up and down the keyboard, thus giving me the clue that the analog and digital systems had become "floating" relative to each other.





Kyle 

jkjelec