Chapter 6: Maintenance and Adjustments
SPD-M20A Service Manual
46
2) Fix the slit ASSY.
6.3.8 Grating Adjustment
1) Remove the PDA ASSY and mount the target PDA (P/N 228-34185-91).
2) Press the target PDA against the stopper and position it so that hole A aligns with the
hole on the base.
Fixing the target PDA using the flat head screw approximately determines its position.
3) Adjust the monochromator inclination and elevation angle to move the spectral image
to the center line of the target PDA mark (figure below).
Adjust the rotation direction so that the end of the 0 order light contacts the 0 order light
mark.
5) Fix the GR ASSY and mount the mask GR.
6) Replace the target PDA with the PDA ASSY.
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