Hitachi ED-A100 User's Manual - Safety Manual page 81

Troubleshooting
Phenomena that may be easy to be mistaken for machine defects (continued)
Phenomenon
72
The MUTE function is working.
The AUDIO/SPEAKER setting is not correct.
The lens door is not fully opened.
The computer cannot detect the projector as a plug
and play monitor.
The BLANK screen is displayed.
BLANK
MUTE VOLUME
Reference
page
10
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18
37
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23