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Topic: RCA Soundhead trouble
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 11-09-2002 08:22 PM
John, I agree with Gordon, as that was one of the points I mentioned in my communication with you yesterday. I also agree with Roger's thoughts in his last paragraph about the grearbox issue. By the way, did this trouble just start, or has it been an on-going problem? You might want to check to see if there is any bronze shavings in the oil, and check the backlash. Compare the backlash with the holdback sprocket shaft with the constant speed shaft. It is easy. All you have to do is grab ahold of the sprocket, and gently rock the motor shaft back and forth. It should feel about the same with both sprockets. Make sure the rag coupling is not busted all to hell, as it will give you a false backlash indication. Do this on several locations within a 360-degree rotation of the shafts. If it feels like it is climbing, better overhaul the gearbox, it is ready to go kapoot! If it easy for you to disconnect the drive from the projector for testing, it might be a good idea just in case there is an undetected bind in the projector head.
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 11-10-2002 12:38 AM
John, the best way I can describe it is "It just doesn't feel right" - after a while, you get a feel for it.  I will recommend you take Roger's advice..overhaul that gearbox ASAP. I would guess yours will last a week yet...if that long. Actually, some theatre supply houses offer a repair exchange on them. It may be your fastest and best way out. Inspect your motor coupling to make sure it is good. If it is deteriorated, replace that, too. Get the motor serviced, too. The starter switch is going bad. Probably because the contacts are burned up. Once they go, cleaning them will be short lived, and all it will do is buy you some time until you can obtain a replacement motor. Starter switches are no longer available for those motors. I understand there are motor shops that will modify that setup, and the motor will probably run another 50 years. Aside their shitty efficiency, I think that motor built by Robbins & Myers, along with the Leland's used on the Simplex SH10** were the best that were ever made. 50 to 60 years trouble free? That should say something...  Your motor is worth having it rebuilt.
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