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Topic: GS-1200 takeup problem - HELP please!!!
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted February 19, 2012 09:42 AM
Bill,
I had this very problem a few years ago. The rear motor would kick in for a few seconds and then stop. In my case it was not the motor or gearing, but the control relay on the main mother board. There are two relays on the big board and they control the power to the reel arm motors through a logic circuit.
My opinion is that this may be your problem, and that it is less likely to be the motor or gearing. Leon Norris can supply and replace these relays if you want. I have purchased these relays from Leon and replaced them myself, but it is a tricky procedure.
Unfortunately, the GS1200 is a very complex machine, a classic example of over- design in my opinion. It seems that 90% of GS1200 problems are switch and contact related, be it relays, microswitches, or solenoids. All this complexity to avoid turning a control knob! ![[Roll Eyes]](rolleyes.gif)
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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj
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Bill Brandenstein
Phenomenal Film Handler
Posts: 1632
From: California
Registered: Aug 2007
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posted February 19, 2012 02:58 PM
Thank you, Hugh and Paul, for your input. What you're saying makes a lot of sense, knowing how many electronic parts there are in that to corrode or wear out. Still, when the reel sticks, it seems like it's doing so at the same mechanical spot in something tucked out of sight. And getting it loose again often requires an unsettling amount of force, nor does it sound nice, which is the only option other than shutting it off if the reel won't turn at all.
I don't think anything I've described here contradicts your suspicions, but I just want to make sure you still think that given my additional comments. I appreciate your advice, gentlemen.
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Bill Brandenstein
Phenomenal Film Handler
Posts: 1632
From: California
Registered: Aug 2007
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posted May 05, 2012 05:42 PM
Hello friends, 3 more months have already slipped by and I have no solution yet. However, I recently popped the back off and had a look and took some pictures. So the top rear of the back side of the GS-1200 looks like this:
So what I'm going to do is stick a dental mirror in there and look at the gears from a side angle:
This is the same image but cropped to show what the mirror sees:
Now you can see that there are 3 gears on 2 shafts. The nearer shaft (frontward) has the largest-looking gear at the far left, and to its right on the same shaft is the smaller gear that fits into the rear gear.
As you can see from the next photo, my several attempts at getting a look at all portions of the gear produced mainly nice pictures, even though as we started and stopped the machine there was evidence of unevenness. Here's a typical view:
There's grungy grease and uneven edges on the teeth, but nothing major that would prevent operation.
However, this next photo shows a rough spot that may be evidence of a super glue job on this gear:
There may be significant wear on the small frontward gear, but it appears that the rear one has problems, though I failed to get a photo that makes clear what it is.
I also took some video and might post it to YouTube. But it's easy to explain: pressing the reverse button results in all gears turning; pressing the forward button results in a jam where the front gear appears to want to turn (moves the distance of about 1/4 of a tooth), but it all ends up sitting there. I think one time the frontward double gear turned but the back one got stuck, but I didn't get that on the video.
Paul, if you're around, I would appreciate your kind assistance on which of the gears you can help me replace... and hopefully it won't cost me all 3! Of course, I'm grateful for anyone else's 2 cents, too, and for Brad making it all possible by hosting us!
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Bill Brandenstein
Phenomenal Film Handler
Posts: 1632
From: California
Registered: Aug 2007
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posted May 18, 2012 07:46 PM
OK, wish I had pictures but the diagnosis is clear: there are two broken gears: the main shaft gear ("gear 3 assembly with 1-way clutch drive"), part P413869, and the upper 3/8" gear that it locks to, part E413510. Paul, I will PM you and take it from there, but welcome any further input anyone might have, with my gratitude. As I stated earlier, this isn't my machine, so it's imperative that a solution is found.
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