Service Manual - AMS Neve

SynchroNet ES/2 Service Manual
MACHINE PARAMETERS
SVODIV $1009
The nominal FM output may be divided by any integer between 1 and 256 using this parameter.
This allows many of the more usual FM servo frequencies to be generated while maintaining the
resolution in the max/min servo parameters. For example with a value of $9C40 in NOMPLY we
can generate the following servo frequencies:
MACHINE SERVO Frequency SVODIV
MCI 19.2 kHz 1
MTR90 9.6 kHz 2
STUDER B67 3.2 kHz 6
Other servo frequencies may be generated by changing the values of NOMPLY, SLOLIM and
FSTLIM with SVODIV selected to keep the resolution in the servo count as high a value as is
practical.
The third servo output type is the DC output. A DC voltage of 0 to +5v is generated from a nominally
9600Hz servo. This voltage may be given a range and offset as determined by the following GAIN
and OFFSET parameters.
GAIN $100a
This parameter sets the range of the DC servo output up to a maximum of 10v. The ES/2 software
recognises that dc servo is in use by a non-zero value in this parameter.
OFFSET $100b
This parameter introduces an offset into the DC servo output such that $00 gives -10v, $80 gives
0v, and $FF gives +10v.
Appendix C suggests a method for adjusting the Offset parameter for a release servo machine.
The TEST parameters (1040 - 104f) contain useful methods for manually experimenting with
values for SLOLIM, NOMPLY, FSTLIM, GAIN and OFFSET.
NEGSVO $100c
This parameter allows inversion of the DC servo sense. If it is zero then the DC servo is increased
for increasing speed. If the parameter is non zero then the DC servo is decreased for increasing
speed.
REVSVO $100d
This parameter is set to a non zero value if the machine speed can be controlled while playing
backwards.
RESERVED $100e
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