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Topic: Crosstalk on old RCA 1040
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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 02-20-2001 09:37 PM
Mack is correct when he says he can work with it to get it closer. What he would do is probably loosen the three mounting screws that hold the whole solar cell bracket to the sound head casting. The holes are bigger than the screws, so he has lots to play with. Chances are, he will have to adjust the solar cell head so the exciter beam will fall on the correct portion of the cell itself. What Ken says also has merit. An old oil-fouled 1 mil slit is about as worthless as a penny sawed in two with a hack saw. It has flat runout up to 7khz if it is good shape, and if oil fouled, you'll be lucky if you get a flat run-out even up to 3 or 4 KHZ. The lense Ken is talking about has a much wider flat response. And, the availability for the old RCA sound heads is questionable. You might consider a cheap IR reverse scan kit for those. It's coming down the road anyway. No sense spending a small fortune for a set of new sound lenses because when the new cyan tracks hit, they will be worthless anyway.
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John Eickhof
Jedi Master Film Handler
Posts: 588
From: Wendell, ID USA
Registered: Jan 2000
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posted 02-20-2001 10:13 PM
Hi Harry! Glad to hear that you're up and running!!! The face of the cell should be .040" from the film, if necessary, you may have to shim behind the clear cell mount and the black mounting arm to bring the cell closer to the film. Or you can remove the cell bracket and enlarge the three mounting holes to get it closer, I trust you have the narrow slit I sent you installed? Anyway, I have had this problem before on 1040 / 1050s and ended up placing a flat shim behind the clear cell piece! Good luck, let me know what you end up with! (A good 1040/1050 will end up with about a 7:1 ratio for signal to crosstalk, be sure the slit lens is focused with 9 KHz loop! Not 7 KHz! And that the azimuth is right on!!!------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com
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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 02-21-2001 12:00 PM
David, I had that problem once in an old 1040. I replaced the sprocket, and the pad roller. (was worn lopsided). It takes a Wolk Pad Roller MNR4-22. Make sure the pad roller is adjusted to two film thicknesses. Your problem should go away. As Brad suggested, change your scanner drum bearings. They can be obtained from a local NAPA auto parts store, but you have to supply the bearing number from the bearing itself. I forgot what the number was.A couple of other things to check: When you thread up, as you place the film on the sprocket, pull it tight, than THEN BACK OFF a MINIMUM of ONE SPROCKET PERF. RCA and Simplex recommend two. The reason I say one or two is because some techs align the sound head with only one or two perf back-off's. If he aligns it with one, then back off one. If he aligns it with two, then back off two. Otherwise, some skewing could occur, especially if the scanner drum is badly worn. I always set mine to two. THEN close your lateral sound guide roller. It looks funky, but trust me - it is correct. NEVER run it tight. If you do keep it tight, it'll probably have a tendency to climb the sprocket, and possibly damage the film. Also, when the machine is running, check if the lateral sound guide roller is bouncing. If it is, the cushion roller has a blob of crud on it, or the roller itself could be shot. Then, lightly touch the end bearing cap on the lateral guide roller. If the bearings are shot, you'll feel it rumble. And, keep that damned WD-40 away from your investment!!! 
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John Eickhof
Jedi Master Film Handler
Posts: 588
From: Wendell, ID USA
Registered: Jan 2000
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posted 02-21-2001 03:29 PM
Dave the 'rolling loop' or wow is most likely the two bearings on the sound drum shaft, These are a grade 8 number 202 bearing, install new ones with only one shield on them, lightly oil with 30 wt non dtergent oil, place bearings so shields protect outside from dirt. If the problem persists, the sound damping drum is low on viscuous fluid. These are hermatically sealed on the RCA. I have NOS replacements available. Another frequent cause may be the top bronze gear in the soundhead is about to fail. When the machine is idle, grab the upper sprocket and see if it rocks back and forth (CW & CCW)
if there si a lot of slop, say 1/8" or so, it's time to open the gearbox and see how bad the upper gear and the steel pinion is!
Have fun!!!------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com
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