6.2.6 Joystick
The joystick is biased by +8V and the X & Y potentiometers are
processed by identical opamp level shifters that are used to set zero
volts out for vertical joystick position. The outputs of these circuits are
followed by balance trimmers to adjust the gain in both directions.
6.3 Calibrations
Pressure calibrations include offset for left and right pressure sensors,
gain adjustment for left and right pressure sensors, gain adjustment for
left and right pressure sensors and balance.
Joystick calibrations include offset adjustment for X and Y axes and +/-
gain balance for X and Y axes.
6.4
Keyboard Troubleshooting Tips
It is important to realize that in normal operation, the clock/power line and
keyboard data line are scanned at a rate that is determined by the CPU
in the VOYETRA module. As such, it will be virtually impossible to sync
on these signals with a conventional oscilloscope since they are not
periodic.
