3M MP8640 Operation Guide - Page 23

Section 6: Maintenance 6.1 Cleaning the Air Filter Note: Clean the air filter about every 50 hours. a) Turn off the MAIN POWER switch of the projector and pull out power cord. Let cool for 20 minutes. b) Remove the air filter from the bottom of projector. Unscrew two retaining screws and pull down and out on the handle to free air cleaner door. Carefully lift up and out on filter door. Remove the air filter c) Clean the air filter using a vacuum cleaner. If dirt is still present, wipe the air filter with a cloth moistened with water and wipe with a dry lint-free cloth. d) After filter dries completely, re-install the air filter. Note: If air flow is restricted due to dust accumulation on filter, the projector may shut down due to over heating. 6.2 Message Table a) On Screen Display. The following messages are displayed on the screen: NO SIGNAL IS DETECTED: SYNC IS OUT OF RANGE: CHANGE THE LAMP: The projector is not detecting a signal. The horizontal frequency of the input signal exceeds the range of the projector, or it cannot be displayed. Change when the lamp message appears on the screen. See Section 6.3 for more information. b) Indicator Display. The ON indicator, LAMP indicator and TEMP indicator will light or blink in the following cases: Indicator status Meaning Lights orange Standby mode ON indicator Blinks green Lights green During warming up During operation Blinks orange During cooling down Lights red LAMP indicator Blinks red Lamp cannot light Air filter open Lights red TEMP indicator Blinks red Temperature inside too high Cooling fan not operating Remedy normal normal normal normal Cool projector by power off for 20 minutes. Ensure filter is closed. Let projector cool 20 minutes. Check air flow and filter. call your dealer *When the LAMP indicator lights or blinks, turn the power off. If the problem persists, contact your dealer. © 3M 1997 3M™ Multimedia Projector MP8640 23