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If you press a key does it type or try to correct? The escapement mechanism that allows it to move from space to space may be sticking and causing your problem. That mechanism just may need a flushing and lubrication. You will see a shaft that runs through the carriage. Try to turn it top to rear until it stops. if you hear a click then it has been turned the right amount. If it doesn't turn, then it is as far as it goes. Try hitting the spacebar and see if the carriage moves. If it moves, hit any key and see if it moves. if it moves, hit another key. If it doesn't move then your escapement mechanism needs to either be flushed and lubed or adjusted.
Sounds like the return lever arm is not putting enough pressure on the return clutch, or the clutch is slipping. The exp key uses the same clutch but the pressure comes from your finger. Theres no way you can fix this yourself. Get an IBM mechanic.
It sounds like a possible tab knockoff problem. This could be a small spring loose or broken in the escapement portion of the machine or the final knockoff in the tab unit out of alignment. You can try setting a tab before the end of the carriage by holding the carrier in place and using your other hand to press Tab Set, but the alignment may be just far enough off to keep you from actually setting the tab. One other thing that sometimes will cause the problem is the pitch setting lever is between the two pitches. Make sure your pitch setting lever is seated in its home position.
The margin release mech. is probably gummy and allowing returns to go past the margin. If thi is a dual pitch machine see if the pitch selector lever will move easily. If not use some WD40 on the margin rack.
The return clutch torque limiter is off or broken. If you take the right dust cover off it is on the turning hub around the middle of the typewriter. a small spring about 1.25 inches long with a hook on the end. I have been fixing these for 35 years. good luck. Lawrence