SHIMPO 921A - Manual (Page 33)

B.1
TRICOR Systems Inc.
APPENDIX B
Force Transducer CCA Calibration
Test Tool Required: Force Calibration Fixture PN 905-810
WARNING
Service is to be performed by qualified
personnel only. Use only plastic adjustment
tools. Failure to comply may result in damage
to the equipment.
Step 1 Power down the unit. Remove the cover from the drive
mechanism assembly (12 screws, Figure B.1). The force
transducer CCA is located on the left side of the drive
mechanism.
Step 2 Assemble the force calibration fixture PN 905-810 by attaching
the force gauge with 2 screws (provided) to the "L" bracket
(Figure B.2) Thread the force gauge tip (Figure B.3) onto the
force gauge. Install the assembled "L" bracket with force gauge
on the 921A baseplate (or equivalent) such that the force gauge
tip is centered under the 921A drive mechanism assembly force
transducer (refer to Figure B.4).
Step 3 Place the SERVICE/RUN switch on the unit rear panel in the
SERVICE position.
The Service Mode is used to perform the calibration/adjustment.
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.
Step 4 Turn on the unit. After successful completion of the power-up
self-test, the unit displays the FORCE CALIBRATION MODE
message. Press the TEST/READY switch once. The message
to Adjust Force Pot and the Offset value is displayed. The force
transducer offset adjustment is performed using this display.