I bought an overhead projector on Ebay. TWICE they sent me one. Both times it came in damaged.
The second time, the machine was a 3M 9550. The top glass was cracked, which I can replace, IF I can get the machine to run... when I hit the switch, nothing works!
I'm trying to find the fuse (have called 3M but the tech I talked to said "It should be right here...") and I found nothing near the area he was describing.
I'd like to find a wiring diagram and am having no luck. Am wondering if you can help direct me to an online schematic or find the fuse to see if it needs replacing. The buyer said it worked when they shipped it to me.
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On your first concern, a possible reason for the 'Sync is out of range' is because your laptop's resolution is just too high for the projector to handle. You may have to manually lower down your screen resolution (right click on a clear area of your desktop, click on properties, settings tab, move bar of screen resolution towards the left). Try different settings that will give you best performance without the projector rejecting the input signal.
Am not sure about your second concern though, offhand your description sounds like video noise. You may have to check that your connectors are firmly plugged in. A longshot is to remove any possible source of interference like wireless phones including your mobile, WiFi AP and the likes. Perhaps you give the first suggestion a try and see if the purple dots disappear when you have the projector running ok. Further you may have to reset your projector if it's got one. Normally it's a small button clearly marked RESET somewhere at the rear of the unit. Hope this works out for you. Pls comment/post back should you need further information. Good luck and kind regards.