SHIMPO 921A - Manual (Page 25)

TRICOR Systems Inc.
5.1
SECTION 5
SERVICE & ADJUSTMENTS
5.1 SERVICE MODE
WARNING
The Service Mode operates the moving platform at
some service mode steps. Never operate the unit
without the platform properly setup with the drive
mechanism height adjusted to provide a suitable
stop for the platform force transducer.
The Service Mode provides a means to periodically test and adjust the 921A
internal measurement circuits. Adjustments should be performed on a
regular basis as determined by the user's requirements. The Service Mode
adjustments/calibration should be performed at least on an annual basis.
The SERVICE/RUN switch is located on the back panel (B-Figure 1.1). Turn
off the 921A and place the switch in the SERVICE position. Install a
Calibration Force Gauge under pressure transducer before turning on the
921A. Ensure that the serial communication cable is disconnected from the
921A. Turn on the 921A. It will perform its self-test routine and enter the
Service Mode automatically. The message FORCE CALIBRATION MODE,
PRESS READY TO CONTINUE will be displayed.
The Service Mode requires pressing the TEST/READY switch on the front
panel to increment or step through the various service mode display screens.
The TEST/READY switch must be depressed and held for at least 1 second
prior to release to ensure the unit will recognize that the switch is pressed.
5.1.1 Force Calibration
This step allows adjusting the force offset and gain electronics on the force
transducer assembly. Appendix B provides the detailed instructions for
adjustment/calibration of the force transducer assembly.
If the operator wants to proceed to a different service mode step, be sure the
platform is properly setup (see warning above) then press TEST/READY, as
required.