Hitachi CP-X4030WN Operating Manual page 116

Troubleshooting
Phenomena that may be easy to be mistaken for machine defects (continued)
Phenomenon
116
Cases not involving a machine defect
The signal cables are not correctly connected.
The MUTE function is working.
The volume is adjusted to an extremely low level.
The AUDIO SOURCE/SPEAKER setting is not correct.
The lens cover is attached.
The signal cables are not correctly connected.
The brightness is adjusted to an extremely low level.
The computer cannot detect the projector as a Plug-
and-Play monitor.
The BLANK screen is displayed.
BLANK
The USB TYPE B port is selected as the picture input
source even if MOUSE is selected for USB TYPE B.
MUTE VOLUME + -
USB TYPE A
USB TYPE B
LAN
Reference
page
51
104
4
11
59