Hitachi HDPJ52 User's Manual And Operating Manual page 66

Troubleshooting
Phenomenon
Flicker appears on
the screen.
Projector is very
noisy.
NOTE
• Although bright spots, dark spots, uneven color or misconvergence
may appear on the screen, these are common characteristics of liquid crystal
displays, and do not constitute or imply a machine defect.
66
Cases not involving a machine defect
AUTO1 or AUTO2 is selected for the BLACK mode.
Please set the BLACK mode to TURN OFF using the BLACK button
(27) or the BLACK item in the PICTURE menu (41).
The WHISPER function is working.
The WHISPER function may cause screen flicker.
Set the WHISPER item (48) in the SETUP menu to NORMAL.
The fan speed has been automatically changed.
When the ambient temperature is, the projector will automatically
raise the cooling fan speed to keep the internal temperature stable.
Lower the ambient temperature.
If you want to reduce noise more, set the WHISPER item (48) in
the SETUP menu to WHISPER.