
3M Multimedia Projector MP8620 Troubleshooting
3M 1999 3-9
3-4-8.
Humming Noise. Slowly Passing Horizontal Bars
Probable causes are:
Signal sources are connected to different power sources.
VCR connected to aerial system and to projector.
Bad signal.
Possible solutions are:
Locate the source of disturbance. Disconnect the sources one after another from the projector.
Connect all
sources to a common power source.
Remove antenna connection from VCR. If the disturbance disappears, use a bypass filter (isolating
transformer) to connect the antenna to the VCR.
Try different input source.
3-4-9.
No Power. Power Shuts Off During Presentation
Probable causes are:
Power switch OFF.
Projector overheated.
Possible solutions are:
Turn on Power switch to projector.
Remove any objects blocking ventilation and allow projector to cool down. Power will return and projector
will be in Standby mode.
MP8620 Message Table
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