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The small rotary switch under the transport cam gear gets oxidized and the unit thinks it needs to eject the tape even tho it is already out. Usually they make a loud clicking noise as the worm gear slips on the drive gear. It will eventually break the drive gear or loader gear. Cleaning that switch usually fixes that problem. On some later ones the tension arm won't move properly due to a broken pin on it's lever underneath. These can be hateful as the later ones had no plugs on the transport. The wire harness' were solded on both ends making it a time consuming repair to remove the transport. I've got a few customers that love the 13 inch versions. I've "retired" a few that were too broken up. It amazes me how they can get any transport stability as it is nealy all plastic. Once running, the tape path is pretty tight from tape to tape.
And before I forget, no take up is usually the clutch has fallen apart. Put it back together, straighten any broken levers.
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