Place the clutch wave-plate (A) on a surface plate, and set a dial indicator (B) on the wave-plate.

Find the bottom (C) of a phase difference of the wave-plate, zero the dial indicator, and make a reference mark on the bottom of the wave-plate.

Rotate the 1st clutch wave-plate 5 or 6 tooth of angles apart from the bottom while holding the wave-plate by its circumference, and rotate the 3rd and 5th clutch wave-plate about 60-degrees apart from the bottom while holding the wave-plate by its circumference. The dial indicator should be at the top (D) of a phase difference. Do not rotate the wave-plate while holding its surface, always rotate it by holding its circumference.

Read the dial indicator. The dial indicator reads the phase difference (E) of the wave-plate between the bottom and top.

Standard:

0.07−0.20 mm (0.003−0.008 in.)

Rotate the 1st clutch wave-plate 5 or 6 tooth of angles from the top, and rotate the 3rd and 5th clutch wave-plate about 60-degrees. The dial indicator should be at the bottom of a phase difference (F and G). Zero the dial indicator.

Measure the phase difference at the other two tops (H and I) of the wave-plate by following Step 3 thru 5.

If two of the three measurements are within the standard, the wave-plate is OK. If two of the three measurements are out of the standard, replace the wave-plate.