3M MP8740 - Manual (Page 20)

© 3M 1999 3M ™ Multimedia Projector MP8740
ENGLISH
Section 7: Troubleshooting
17
Symptom
No picture and sound
Color is weak and tint is
incorrect
Picture is dark
Picture is not clear
LAMP indicator lights
red.
LAMP indicator blinks
red.
TEMP indicator lights
red.
TEMP indicator blinks
red.
Cause
• The Main power is not turned on.
• The power cord is disconnected.
• The setting of the input source is not
correct.
•RGB/Video/Audio wiring to projector is
not correct.
• RGB/Video wiring to projector is not correct.
• The brightness is set fully to dark.
• Audio wiring to projector is not correct.
• The volume is set to minimum.
• The unit is muted.
• The color and tint have been adjusted
incorrectly.
• The brightness and contrast has been
adjusted incorrectly.
• The lamp needs to be replaced.
• Projector is out of focus.
• Lamp will not ignite.
• Air filter door on bottom of case is open.
• Temperature inside projector is too hot.
• Cooling fan may be obstructed by metal
screen under foam air filter.
Solution
• Turn the MAIN POWER switch on.
• Insert the power cord into an AC socket.
• Set the correct input using the input select button
of the projector or the remote control.
• Connect the cable to correct input/output source.
• Connect the cable to correct input/output source.
• Press the MENU button and increase
BRIGHTNESS.
• Connect the cable to correct input/output source.
• Press the VOL button and increase VOLUME.
• Press the MUTE button.
• Adjust the color and tint correctly.
• Adjust the brightness and contrast correctly.
• Replace the lamp with a new one.
• Adjust the focus.
• Turn off power and let cool for 20 minutes, then restart.
• If problem persists call your dealer.
• Ensure air filter door is closed.
• Do not block the ventilation holes.
• Clean air filter
• Align metal screen.
• If fan blade is still obstructed, call service.
Sound is heard with
no picture
Power cannot be turned
on.
Picture is displayed
with no sound
7.1 Sympton/Solution Table
Error Message Displays
NO INPUT IS DETECTED
SYNC IS OUT OF RANGE
CHANGE THE LAMP
RESET THE LAMP TIMER
CHECK THE AIR FLOW
Cause
The projector is not detecting a signal.
The horizontal frequency of input signal
exceeds projector capability.
Lamp operation time is greater than 1,900
hours.
Lamp operating time is greater than 2000
hours. Safety feature shuts projector down
after 10 minutes.
Air flow to cooling fan is blocked.
Solution
Check cable connections to input device. Input device not
connected to this input mode, switch to next mode.
Switch projector to correct resolution.
See Appendix A.5
Change the projector lamp and reset the lamp operation
hours to zero.
Change the projector lamp and reset the lamp operation
hours to zero.
Clear air flow path to fan and clean air filter.
7.2 Message/Solution Table