Hi,
1. What does really the transposition gate zeroing do?
It does precisely what its name says: it insures the voltage used? to determine the frequency of the VCO is zero, or reasonably close to zero.
?? Can it effect tuning between two channels on one voice?
If you modify VR1 without modifying anything else, yes. But tuning the M-board requires several settings which should all be done. (As explained on page 5 of the CS-80 adjustment procedure)
2.
?It says I should measure the voltage between CP6 and EK terminals.
Does that mean I should put a minus probe on CP6 and plus on EK ?(or
vice-versa)?
It does not matter. Since the measure will vary around 0, you should expect negative as well as positive values, depending on the setting of each variable resistor. With a DVM this should not be a problem.
3.
It says I should read .120mV. at 2?.
Not exactly: it says you should set the voltage to 0, plus or minus at most 0.120 mv. The closest to 0 the better.
My DVM is very basic and the max
resolution I get is 200m. Depending on the board i read 0.28 to 0.40! I
have no clue is that normal every board is way off?
The idea is to set VR1 so that you measure a voltage between CP6 and EK as close to 0 as possible.
But remember that the tuning of a board is a process that requires all steps 7 to 12 to be performed.
Joachim
