8mm Forum: Picture jump in my Eumig 940, any ideas on how to fix?

»	8mm Forum » 8mm Forum » Picture jump in my Eumig 940, any ideas on how to fix?

UBBFriend: Email this page to someone!

Author

Topic: Picture jump in my Eumig 940, any ideas on how to fix?

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted April 14, 2009 09:11 AM

In my 940 Eumig I have increased the gate tension to limit picture jump by adjusting the plastic gate catch position as far back as it will go (loosened screw, moved toward rear of projector, re-tightened).

This has solved 80% of the problem, but are there any other tips you Eumig experts can offer me? On some films the picture still looks like it wants to jump, but to nowhere near the extent it was previously.

Any assistance appreciated in order to have this fine projector running perfectly!

David

| IP: Logged

David Pannell
Phenomenal Film Handler

Posts: 1072
From: Horsham, West Sussex, UK
Registered: Nov 2004

posted April 14, 2009 11:23 AM

Just a thought, David. Have you cleaned and lubricated your films with a proprietary film cleaner/lubricant such as Film Guard or Film Renew, and polished the film path of the projector (particularly the gate area) with a good quality wax polish?

Works wonders for smooth film transport!!

--------------------
Dave.

Valves and celluloid - a great combination!
Early technology rules OK!

| IP: Logged

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted April 14, 2009 08:55 PM

David, many of my films are treated (with Film Guard and others), and it certainly improves their transport through the gate. The thing is all of my films run perfectly through my Elmo ST1200, so the problem is the Eumig.

What sort of wax have you used on the gate,just a household wax? I have considered doing this and was hoping for advice in this area, thank you.

| IP: Logged

Osi Osgood
Film God

Posts: 10204
From: Mountian Home, ID.
Registered: Jul 2005

posted April 14, 2009 11:03 PM

David,

Your posts on this topic have filled me with a little hope concerning my Chinon 9500. I know it's a completely different make of projector, but I'm wondering if I can adjust the springs and such that you were talking about, and perhaps fix my Chinon.

I ran a optical print a few months ago, and somehow the claw stopped catching the sprockets. The claws still there and all, but for some odd reason, it just glides through without catching. Everything else is fine.

--------------------
"All these moments will be lost in time, just like ... tears, in the rain. "

| IP: Logged

David Pannell
Phenomenal Film Handler

Posts: 1072
From: Horsham, West Sussex, UK
Registered: Nov 2004

posted April 15, 2009 01:53 AM

Hi David,

Yes. I just use a regular, but pure household wax. The thing to be careful about is to ensure that it is wax only, and does not contain any abrasive cleaner compound. If in doubt, go for a pure beeswax.

--------------------
Dave.

Valves and celluloid - a great combination!
Early technology rules OK!

| IP: Logged

Lars Pettersson
Master Film Handler

Posts: 282
From: Stockholm, Sweden
Registered: Jan 2007

posted April 15, 2009 05:23 AM

Picture unsteadiness can be -regardless of projector make- problems with claw (hitting film as it enters sprocket, worn claw movement inside machine, bent teeth on claw), EXCESSIVE CLAW PROTRUSION (going in too deep and hitting film), film pressure plate (insufficient pressure), side pressure plate (dirt, insufficient pressure), WRONG SIZE filmLOOP (too small/large above/below gate). Excessive torque at feed/take up spools can also affect steadiness. Also, if the film pressure plate is mounted slightly wrong for whatever reason, the claw may hit the plate and cause problems -put a fingertip on the plate when film is running and you can feel if anything´s wrong.

Sometimes what one thought was a soft lens can be picture unsteadiness, not left-right or up-down but simply film hit by claw and therefore vibrating as it´s projected! [Eek!]

Hope you find some clue to your particular problem. [Smile]

Cheers
Lars

| IP: Logged

James N. Savage 3
Phenomenal Film Handler

Posts: 1375
From: Washington, DC
Registered: Jul 2003

posted April 15, 2009 06:33 AM

Lars-

That is very true advise. I've had the same problem with one of my Sankyo's. I have two, one runs smooth and the other one jumps the film, looses loop, etc.

I have run them side by side, and all of the mechanics seem to run exactly the same.

David- the best thing to do is to keep tinkering and experimenting. If you have a film that you don't mind if it gets damaged, run it through continuously, while you are tinkering around the film gate. For tinkering, metal paper clips work great! If needed, you can flatten one end of the paper clip with a hammer to fit in tight spaces.

Good luck with your experimenting.

James.

| IP: Logged

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted April 15, 2009 12:06 PM

Thanks guys, I will continue to play around and let you know how I go. I am pretty sure it is just the gate tension as on many films, and even most of the jumpy ones, it mostly runs OK.

I will try the wax on the gate and also try to re-tension the pressure plate again.

I have been using an old film that jumps James; good advice for any troubles.

| IP: Logged

Lars Pettersson
Master Film Handler

Posts: 282
From: Stockholm, Sweden
Registered: Jan 2007

posted April 15, 2009 01:47 PM

On some projectors the tension in the pressure plate should be greater on the lower part than on the upper part, it´s worth a try

Cheers
Lars

| IP: Logged

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted July 14, 2010 01:26 AM

An update on my 940..........

Wax helped a little, but it is lack of tension in the gate springs that is causing the problem. Any film that jumps in my Eumig is fine when run in my Elmo and other projectors. When I apply just a little more pressure to the gate spring shafts, the jumping stops.

I can apply extra tension by wedgeing the gate spring shafts with rubber or carboard against the back of the lens collar and the problem is fixed. It seems over time the springs have weakened and there is no further adjustment.

Long term I am looking to replace the springs.

David

| IP: Logged

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted July 14, 2010 09:46 AM

Hi David,
Have you tried adjusting the position of the fixed edge guide? It is the thin plate bolted to the rear gate by two little screws, and it controls the horizontal centering of the film perforations with respect to the claw. When I first got my 938 I experienced vertical instability with many films. A slight adjustment of that fixed plate totally fixed the problem, and all films are now projected rock steady.

--------------------
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

| IP: Logged

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted July 14, 2010 09:52 AM

Paul, I have not tried that.

I know what you are talking about, so I'll give it a try, thanks.

| IP: Logged

David Kilderry
Jedi Master Film Handler

Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006

posted July 28, 2010 09:50 PM

Paul, this worked very well with the test film I was using, but I found I had to move it part way back as a happy medium for other unsteady films.

It is a big improvement, thank you. Who would have thought a lateral guide would dictate vertical stability?

David

| IP: Logged

Tay Yu Xian
Junior
Posts: 2
From: Singapore
Registered: Jun 2012

posted June 17, 2012 03:43 PM

Hi David hi paul,

I've the same problem with film jump and it produces a stuttery image on screen. Tried adjusting the sideway adjustment of the claw based on David's advice but still problem persists. When i applied pressure on the pressure gate problem is still there.

Can you guide me pls. Using an eumig 802

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2