Mitsubishi Electric HC4900 User Manual page 39

Troubleshooting (continued)
No image appears on the screen. (continued)
Problem
The screen for
entering the password
appears.
"NO SIGNAL" is
displayed.
Images are not displayed correctly.
Problem
Projected images are
shaking.
Projected images are
displaced.
Projected images are
distorted.
Projected images are
dark.
Projected images are
blurred.
Afterimages persist on
the screen.
Red, blue, and
green dots appear in
projected images.
Black dots appear in
projected images.
Fine streaks are seen
on projected images.
Projected images
become wavy.
Hue is not appropriate.
Tint in projected
images is incorrect.
Solution
• PASSWORD FUNCTION in the FEATURE menu has been set to DISPLAY INPUT to
enable the password lock.
Enter the password or contact the person in charge of management of the
projector. (See page 34.)
• Turn on the power of the connected device, or check whether there is something
wrong with the connected device.
• Check whether the external device output signals. (Check this especially when the
external device is a notebook computer.)
• Check that the cable connected to the external device isn't defective.
• Check that the projector is connected to the external device using the correct
terminals.
• Check that the connected device is correctly selected as the input source.
• When an extension cord is being used, replace it with the supplied cable and check
whether images are projected correctly. If images are projected correctly, use an RGB
signal amplifi er along with the extension cord.
Solution
• Check that the cable connected to the external device isn't intermittent.
• Connect the cable's plug with the external device's connector fi rmly.
• Press the AUTO POSITION button.
• Some computers output out-of-spec signals on rare occasion. Adjust the SIGNAL
menu. (See page 33.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 10.)
• Adjust BRIGHTNESS and CONTRAST in the IMAGE menu. (See page 30.)
• Replace the lamp. (See page 35.)
• Adjust the focus. (See pages 17 and 22.)
• Clean the lens.
• Press the or button on the remote control to eliminate fl icker.
• Adjust TRACKING and FINE SYNC. in the SIGNAL menu. (See page 33.)
• Adjust BRIGHTNESS and CONTRAST in the IMAGE menu. (See page 30.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 10.)
• This phenomenon is improved by keeping projecting an evenly dark image. (Such
"image burn-in" phenomenon where afterimages persist on the screen may occur if a
stationary image is kept displayed on the screen for a long time.)
• This phenomenon is unique to LCD projector and isn't a product malfunction.
(A small number of pixels always stay on or off, which are not malfunctions. More than
99.99% of the pixels are effective.)
• This is due to interference with the screen surface and is not a malfunction. Replace
the screen or displace the focus a little.
• Vertical or horizontal streak noise may appear on the projected image, depending on
the type of the DVD player or game console you use. In such a case, you can reduce
such streak noise by enabling the LPF.
• Connect the plugs of the cables to external devices securely.
• Keep the projector away from devices that emit interfering radio waves.
• Check that the cables connected to the external devices are not broken.
• Check that COMPUTER INPUT in the SIGNAL menu is correctly set. (See page 28.)
• Check that the cable connected to the external device isn't broken.
http://www.pureglare.com.au
EN-39