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