Question about Elmo Projectors TRV-35H Slide Projector

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Elmo TRV-35H "eating" slides

I recently acquired an Elmo TRV35H which is damaging slides when ejecting them. It appears that the slide is being jammed against the bottom of the slide tray slot during the ejection cycle. The same problem occurs with two separate Kodak 80 slide trays.

There is a pivoting plate that appears intended to hold the slide against a fixed plate when a slide is being projected. And this plate is VERY slow to pivot back to push the slide against the fixed plate. I suspect that the slide is being ejected before it is properly positioned by the pivoting plate causing the problem.

I have examined the mechanism for the pivoting plate and notice a white plastic cam that rotates with difficulty. Lubricating the cam wear surfaces with white grease does not seem to have helped. There is a screw in the cam, but it is inaccessible and not clearly an adjustment.

Anyone with experience or suggestions?

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CAUTION: Mains voltage connections are exposed once the base of the projector is removed. ONLY attempt repairs if you are confident of your skills!

There are several possible causes for this problem:

1. Kodak produce two different types of carousel magazines - one for glass mounts and one for card mounts. You must not mix glass and slide mounts in the magazine - it causes the focus mechanism to 'hunt' and also causes the slides to jam, as described.
2. These projectors are almost antiques ..... lubricants dry out and the mechanisms slow down and stick! Some 'technicians' apply graphited grease over the top of the dried stuff, hoping it will soak in! Clean as much of the old lubricants off with 'electronic component' solvent on cotton buds particulalrly around all of the cams. Pay particular attention to the slide lifter cam follower - grease here can cause the lifter to only lift, or drop, the slide partially though its full travel. I use 'CopperEase' very, very sparingly on the cams (NOT on the face of the slide lifter cam) and haven't experienced any problems.
You should not adjust the cams on their shaft.
3. The slide pressure plate is acuated through one of the cam followers, opening and closing at the right time. There is a very fine pivot bar at the bottom of the plate. The pivot points can be lubricated with a single small drop of fine industrial sewing machine oil. Avoid 3in1 oil at all cost!

Posted on May 27, 2011


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