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Author Topic: Which Model Soundhead Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 09-08-2005 01:35 PM                     HI Ian - vertical runout on the impedence drum? Can you grab the drum itself and notice any vertical play? Course, with not being there to see it in person and usually the drum assembly with shaft is a one piece unit..BUT it possibly sounds like that there was a major wrap (if this happened recently) and the film tighten up so bad that it literally yanked up the drum to where it's bent from off-center a tad. And being off-center a tad the squareness of the drum is off set to where the film wants to travel towards the inside and thus, your getting the sprocket run in the optical pickup. Or, maybe the inner bearing of the scanner drum assembly possibly has died on you causing the shaft not to be square in the frame and the tension of the film is pulling the drum slightly upwards. Take the impedence drum completely out of the frame, check bearings and do this trick: have the drum over an edge of a countertop and roll the shaft across the countertop and see if their is any of this vertical motion. ..or maybe a crack has developed in the casting itself especially in the bearing sockets, causing bearing play..(Uh..oh) Another thing that I want to ask, yet this isn't directly related to this condition and that is - how are both belt sprockets on that drive shaft? Does both sprockets turn at the same time, or does one sprocket turn, then the next one turns shortly after? If any amount of good sprocket play makes the soundhead not to be in absolute sync with the projector head and wonder if this could cause your film travel problem in the soundhead. ....little tips to check out. (But it's funny that one print can do this, yet the other ran smooth. That's the only kink that sticks out in this episode - to where one COULD blame print damage, instead of machine fault..) thx-Monte  |  IP: Logged Ian Bailey Master Film Handler Posts: 317 From: Nambucca Heads, Australia Registered: Jun 2003 posted 09-08-2005 06:54 PM                     Hi Monte I will take your advice and completely remove the unit,that way I can check the whole lot.There is no play at all in the unit(the drum and shaft are all one piece).With the whole unit removed then I should be able to determine which part is at fault-drum & shaft/bearings & housing.It just seemed a bit daunting at first but after having a good look there is not much to this unit.My next problem will be if parts are still available-is this impedance drum and shaft common in other model Simplex sound heads? I will have a close look at the sprocket movement also. This unit HAS been through way too many Brain Wraps in its life.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 09-09-2005 02:55 AM                     quote: Ian Bailey is this impedance drum and shaft common in other model Simplex sound heads Basically, the impedence drum and lateral roller (with felt instead of the now rubber) lock assembly originated from the SH-1000, or commonly known as the "4-star" head - which this unit came out before the 2nd World War (initial date escapes me though..). The SH-1000 was a workhorse of a soundhead - never failed, just keep the oil level in the transmission where it supposed to be at and change the oil out on a regular basis. If not, those two brass gears inside would get eaten up very quickly. But with the front motor mounting of the "4-star" became old-fashioned that Simplex wanted to compact things..thus out came the 5-star, which I agree with some, just not the same... But, treat them good and have patience with them and they'll do the task needed. Just wished that Simplex kept the viscous flywheel design from the "4-star" on the "5-star", so the impedence drum can ramp up to speed along with the motor instead of dragging behind until it sped up to norm. -Monte  |  IP: Logged Stan Gunn Expert Film Handler Posts: 176 From: Clematis, in the hills near Melbourne Australia Registered: Aug 2000 posted 09-10-2005 07:18 AM                        Ian I may have some sound head parts for you,wil look for them. Regards Stan.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-10-2005 10:41 AM                     Actually Daryl O'Shea and a few other techs have the best cure for that soundhead and thats a sledge hammer! That one is right up there with that Ballantyne that we've been discussing over in another thread. Monte: Thats NOT the same impedance assy. thats in the 5 star!! In fact everything in there is different fomr the parts in a 5 star. Thats why we call that sound head the No-Star. Replacement with an SH-1000 is ***DEFINATELY*** the best route of action. Mark  |  IP: Logged

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