Question about Minolta Office Equipment & Supplies

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I have a minolta rotomatic slide projector made by Sawyer. Its 50 years old. It still works, however after its been on for a bit the changer becomes sluggish and requires manual operation...

The sluggishness seems to happen when the unit heats up. I used alcohol to try to clean the mechanism and some lithium grease on sliding surfaces and gears, all to no avail. Everything else works fine.

Posted by Paul Borisoff on


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Larry Ng

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I bet it must be grease free, it came like that.

Posted on Mar 01, 2020

Testimonial: "Thanks. The problem existed before the grease... however, I'll remove it and see what happens... I wonder if WD-40 or an oil-less cleaner would be best suited?"

  • 1 more comment 
  • Larry Ng
    Larry Ng Mar 01, 2020

    747AQ? what model, many made. 737?
    that projector is old what if the old plastic is deformed.
    surely the drive runs dry, any oil or grease only gets stiff and overloads the drive.
    I took all my slides back to 1969 (even vietnam) and using digitizer did that, no more slides here,well, packed deep in the attic.
    but only had 100s. here.

    is that the drive device a SOLENOID.
    and it gets hotter , weaker, (physics that)
    make sure it is fully clean.
    what if the solenoid iron core when rusty.
    remove it and look>? if did and gets hot it would bind up. 50years,old, what if stored in a basement and parts rusted, any grease that old turns to glue or worse, look for that too.
    I had one and hated it, got KodaK carousel
    it love to jam and could never learn why and I am gear head.
    IIRC it only liked perfect slides, no fuzzy edges.
    if I was serious in this , id get the service manual and they have 2, one for parts
    oil if must Id use silicon spray oil. super light.
    to lubo or run dry
    all bearings shafts and motor lube
    other thing must be kept dry and clean.
    on some the carousels were warped, in hot attic stored.
    grease put on things not to grease gather dust and dirt then jam,..
    I could not find one manual online, (50years old ,lost in the sands of time)

  • Anonymous Mar 01, 2020

    buy a Kodak, and not look back. trust me.

  • Anonymous Mar 01, 2020

    the sawyer has manual lever too.
    if that binds up and is hard to move bingo.
    with slides loaded.



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