Leitz Pradovit Colorplan 250 Autofocus - troubleshooting

[FredR]

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My Leitz Pradovit Colorplan 250 Autofocus projector all too often will not pull a slide from the tray into the projector, requiring me to return to the projector and push the mechanism and slide a few millimeters before the machine pulls the slide in.  Typically this will happen repeatedly.  I've looked at the trays and the "slide transport arm" (No. 9 in the photo), and I'm tempted to take a file and start modifying the latter.  But I know it's probably just an adjustment - somewhere.  The original instruction booklet does not address the issue.

 

Has anyone prior similar experience who can advise me, or point me to a webpage or video with troubleshooting advice for this projector?  I've been unable to find the solution through searching the internet.

 

Thanks in advance for your help!

 

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Edited August 28, 2018 by FredR

[TomB_tx]

I think I remember having to replace a drive belt inside that had stretched. That was some years back, and did get the projector working, but the autofocus would never lock on. I found a Leitz tech bulletin about repairing autofocus by changing components on a circuit board, but never got around to trying it.

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[FredR]

I think I remember having to replace a drive belt inside that had stretched. That was some years back, and did get the projector working...

 

That's good to hear, because I ordered a belt last week from Van Eck in Tilburg, Netherlands.  I hope the replacement procedure will be obvious, because Van Eck only has Dutch and German service manuals, neither of which I read.  I replaced both switches (power and bulb) which was a real PITA, but it was a success, so I think I can handle it.

Edited September 5, 2018 by FredR