Hitachi ED-X24 User's Manual And Operating Manual page 71

Troubleshooting
Phenomena that may be easy to be mistaken for machine defects (continued)
Phenomenon
NOTE
62
Cases not involving a machine defect
The brightness and/or contrast are adjusted to an
The ECO MODE function is working.
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.
Reference
page
26
34
56