3M 2100 Service Manual

Also see for 2100: Illustrated parts breakdown

Contents

3M 2100 Service Manual Manual pdf 10 page image

9/92MODEL 2100 OVERHEAD PROJECTOR2-4CLEANINGThe optical components of the overhead pro-jector require occasional cleaning to removethe dust and oil which tends to accumulateand absorb light. 3M Brand Lens Cleaner(Part No. 78-6969-7086-6) is recommended.A small amount of mild detergent in water willserve as a substitute. Use soft, lint-free cloths,one to apply the solution and another fordrying.NOTENever use paper lens tissues onprojection lenses as they may dam-age the lens.Cleaning Stage Glass and Fresnel LensWhen cleaning the underside of the stageglass and the top side of the Fresnel Lens,observe the following steps.1. Pull the Release Latch and lift the topcover Top Cover Assembly (See Figure).2. Remove the Top Cover Assembly by pull-ing either one of two hinges outward untilthe hinge pin is out of the hole. Slide thecomplete Top Cover Assembly in the oppo-site direction to release the second hingeand lift up and out (See Figure).3. Loosen the four screws holding the FresnelLens in place. NOTE: Do not remove thescrews.4. Turn the retaining clips off to one side.5. Remove the Fresnel Lens.6. All surfaces can now be cleaned.7. Replace all components in reverse order.MirrorsThe mirror in the Open Lens ProjectionHead of all Model 2100 (4100) projectorsare front surface mirrors and mustNOT becleaned with a cloth and lens cleaner.Remove any surface dirt on this mirror witha Camel Hair Brush only.Prior to serial number 435242 a front sur-face type Chassis Mirror was used (cleanas above). After serial number 435242, asecond surface high reflective type is usedand may be cleaned with a soft cloth andlens cleaner.