Hitachi ED-X40 User Manual page 72

Phenomena that may be easy to be mistaken for machine defects (continued)
Phenomenon
NOTE
Cases not involving a machine defect
The brightness and/or contrast are adjusted to an
The lamp is approaching the end of its product
lifetime.
Either the focus and/or horizontal phase settings are
not properly adjusted.
The lens is dirty or misty.
The SAVING function is working.
Troubleshooting
Reference
page
26
57
35
63