8mm Forum: Help with GS please

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Topic: Help with GS please

Mal Brake
Jedi Master Film Handler

Posts: 591
From: Neath, South Wales, UK
Registered: Jun 2003

posted October 26, 2003 10:26 AM

I tried to view the films bought at Ealing on my GS but a problem has arisen and I could do with some help please.
I pressed the FWD button and the take-up reel turned but the motor that drives the shutter and film transport didn't turn.
The lamp will not light but the bulb glows on pre- heat and the cooling fan does not operate when the lamp switch is operated.
I would be grateful if anyone recognises this problem and offers some advice. Thanks, Mal

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I'm gonna live forever or die trying

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Mike Peckham
Phenomenal Film Handler

Posts: 1461
From: West Sussex, UK.
Registered: Jun 2003

posted October 26, 2003 12:58 PM

Check the position of the ESS switch on the rear panel, I had exactly this problem and nearly arranged for it to go of to be repaired. I think I must have pushed the switch by mistake over into the synchro position when I lifted the projector on to the stand.When I switched it back to the normal running position all was well. [Wink]

Hope thats all it is

Mike. [Smile]

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Auntie Em must have stopped wondering where I am by now...

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Mal Brake
Jedi Master Film Handler

Posts: 591
From: Neath, South Wales, UK
Registered: Jun 2003

posted October 26, 2003 01:46 PM

Thank you for the suggestion Mike, I've had a look and the switch was in the normal position so unfortunately it's not that.
Mal

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I'm gonna live forever or die trying

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Ian O'Reilly
Jedi Master Film Handler

Posts: 737
From: London
Registered: Jun 2003

posted October 26, 2003 03:30 PM

Mal
Seems like you have got a relay problem, contact Bill Parsons he can help.
Ian

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Mal Brake
Jedi Master Film Handler

Posts: 591
From: Neath, South Wales, UK
Registered: Jun 2003

posted October 26, 2003 05:32 PM

Ok, thanks Ian
Mal

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I'm gonna live forever or die trying

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted October 27, 2003 03:32 AM

Sounds like exactly the same problem I have on one of my GS-1200's. Difference being when mine went a couple of weeks ago I had smoke belching out the top of it.

Good to meet you on Saturday Mal. Can I have some of those women back now?

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British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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Mal Brake
Jedi Master Film Handler

Posts: 591
From: Neath, South Wales, UK
Registered: Jun 2003

posted October 27, 2003 04:03 PM

This is what happened today......
My friend picked up me and the GS this morning and we went to his home where we could work uninteruppted. We plugged in the GS and the machine worked straight away. We then took it in to his screening room (ok, bedroom with blackouts) where the GS decided to run very very slowly. I tilted the machine just a few degrees to move it and it started to run properly again.This happened a few times and we finally isolated the problem to an area around the operating switches. We removed the switch block and a terminal block and a washer fell out from behind the block. After cleaning all contacts and checking joints and connections we re-assembled the GS and it has worked perfectly ever since. We ran it for 90 minutes whilst tilting and rocking it without further mishap. On returning home we ran it again without problems so it would appear all is well again. Thank you for your suggstions, I am very grateful to you all.
Sorry to hear about your GS John but yes you may have the said ladies back, once I had got them I realised I had forgotten what I was supposed to do with them. (mock now, but one day you will reach 50 too).
Cheers, Mal

)

[ October 28, 2003, 04:29 PM: Message edited by: Mal Brake ]

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I'm gonna live forever or die trying

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 05, 2003 12:48 AM

John,
There a 4 diodes on the main board which are the rectifiers for the motor supply. These get hot when the motor is running and eventually get dry jointed and finally go up in smoke. I have repaired a few GS's with this very same problem.
The diodes sre situated in the centre of the main board near the big capacitors and square rectifier blocks. If this is the problem you will find a scortched circuit board. Its easier to see this from the underneath of the board.
My theory is that the diodes run hot but as the motor gets used, carbon builds up and causing arcing accross the armature contacts whic finally increases the current drain through the diodes. The main motor can be stripped and cleaned.
Hope the above helps. If you want any further help feel free to get in touch.
Kevin.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted November 05, 2003 02:34 AM

Kevin, any time you want to pop round just feel free!!!

Seriously though, I've taken the machine to Bill Parsons. It had been making a low whining/buzzing noise for some time which possibly suggests the motor was pulling too much current as well as the problem you pointed out so clearly. If it is the motor then I'm in trouble as there aren't any spares.

In the meantime I'm having to put up with a bog standard GS-1200 albeit with a two-bladed shutter and F1.0 lens.

Incidentally I changed the lamp yesterday evening for the new ESC available from Derann. I haven't decided how good these are yet - there seems to be more light leakage from them than there should be but I'll know better when I test it directly against my other GS-1200 (in Cornwall) which already has a new original ESC lamp in it. Still, well done to Derann for making them available again - I'm pretty sure they're superior to the EJL lamp I took out.

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British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 05, 2003 02:06 PM

Hi John,
I didnt realise that Derann had the new lamps yet, who makes them?
I'm lucky as I still have a spare main motor for my machine. I have had the motor out of my machine and given it a good clean and it certainly ran quieter afterwards.

Kevin.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted November 06, 2003 02:15 AM

Eiki (or is it Eiko?) make the lamps. Assuming I remember to take one with me to the country abode this weekend I'll be able to give a more informed opinion on how good they are. I've been using the Xenon machine too long in London to be able to judge the light output from a standard GS on my London screen. The machine in Cornwall has a fairly recent ESC which I'll be able to change and compare directly. Expect burned fingers!!!

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British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 06, 2003 05:29 AM

Hi John, Yes it's a funny Japanese name but yes they are the people who made the ESC lamp supplied by Elmo in the early days so it should be ok. [Smile]

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted November 10, 2003 05:16 AM

Have tested the new Eiko ESC lamp against a previous ESC with about 20 hours on it. Seems to be a bit more light leakage from the back of the lamp but on the screen there does not appear to be a perceptible difference. I didn't have light meter but will endeavour to check this with a light meter soon.

Watched a few films I know well over the weekend and they all appeared appreciably bright and full of detail you would expect from having just changed to a new lamp.

Don't suppose anyone has tried the new Xenon lamp in a GS-1200 Xenon?

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British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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