Nidek Medical CP-690, Service Manual

Page: 51 / 70

6 - 7
6.6.2 To display or not display the visual acuity
1. Remove the top cover ASSY. (See 5.1.)
2. Loosen BS3 × 6
ZnC
fixing the VA mask.
3. Switch between the display and non-display of the visual acuity by moving the VA
mask.
[In order not to display the visual acuity]
Move the VA mask (M029) toward the outside of
the instrument (right side). Tighten the loosened
BS3 × 6
ZnC
temporally.
[In order to display the visual acuity]
Move the VA mask (M029) toward the inside of
the instrument (left side: mask motor side).
Tighten the loosened BS3 × 6
ZnC
temporally.
4. Turn the power switch ON and project the chart onto the screen to check that the all
visual acuities are displayed (or not displayed). (Check also the light leakage and chart
blockage.)
* When light leakage or chart blockage is found, make fine adjustments of the VA mask
position.
5. Tighten BS3 × 6
ZnC
securely and remount the top cover ASSY.
BS3×
ZnC
VA mask
VA mask
When the visual acuity
is not displayed.
When the visual
acuity is displayed.