8mm Forum: My New GS1200

This is topic My New GS1200 in forum 8mm Forum at 8mm Forum.

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Posted by Paul Adsett (Member # 25) on October 26, 2019, 12:58 PM:

Thanks to the invaluable help and advice of forum members I have been able to restore my previously 'dead' GS1200 to full operating condition. In fact it is now performing just like new with rock steady projection and great stereo sound, better than it has been in years. So great to have this wonderful projector back in service.
Here is a summary of the repairs that were carried out:

Symptom: Take up motor not rotating in FWD projection
Main Control Board
Replaced large Matsushita relay NC4D-P-DC12V. Replaced rectifiers 1B2Z1 and IB2C1. Cleaned and sprayed all board interface contacts.

Symptom: Projector blows 3A main fuse on power up, no motors running
Motor Governor Board
Replaced the entire board due to failure of the NEC UPC1002C

Symptom: Excessive RFI noise through audio playback
BLOWER MOTOR Replaced broken inductor on blower motor with a 100 microfarad ferrite inductor

Symptom; Rewind slow and weak
Adjusted the lever position of both re-wind microswitches.

Sympton: Lamp does not reliably turn on
Replaced microswitch #6 fig 41 at lamp switch location.

Also:
Front cover hinge
Repaired the hinge pin which had broken away from the amplifier cover

In addition I sprayed all the switches with electrolube.

Posted by Janice Glesser (Member # 2758) on October 26, 2019, 01:14 PM:

I feel your excitement Paul. A well running GS1200 is without exception the ultimate 8mm projector. You've reached Nirvana [Smile]

Posted by Dominique De Bast (Member # 3798) on October 26, 2019, 01:52 PM:

Waw. Congratulations !

Posted by Mark Mander (Member # 340) on October 26, 2019, 02:15 PM:

Well done Paul keeping another GS1200 performing as it should,Mark

Posted by Joe Taffis (Member # 4) on October 26, 2019, 04:36 PM:

I'm happy to see that you've got it running Paul! It didn't look good for a while [Roll Eyes]

Posted by Adrian Winchester (Member # 248) on October 27, 2019, 07:31 PM:

Compliments on having the dedication and skill (even with Forum expertise) to pull all of that off. It would probably have taken me about 15 years to complete!

Posted by Winbert Hutahaean (Member # 58) on October 28, 2019, 01:22 AM:

Good one Paul... it is nice if you have a little knowledge about electronics. I am zero.

So the spare parts you mentioned above are widely available in the market or need to go to specified stores?

cheers,

Posted by Paul Adsett (Member # 25) on October 28, 2019, 11:02 AM:

I had to farm out the soldering of the circuit board components. I can get by soldering motor wires and the like, but the board components, such as the big Matsushita relay, have extremely close pins and need a microscope and very steady hand for the precision soldering operation. You have to know your limits!
Leon can supply some of these components, and FFR in Germany can also supply new updated versions of the governor board.
I am really indebted to Phil Murat, Thomas Knappstein, Leon Norris, Stuart Finklestein, for their help and support. Could'nt have done it without them.

Posted by Phil Murat (Member # 5148) on October 28, 2019, 11:55 AM:

It was a pleasure, Paul .

Sharing our knowledges here is something I like first.

Have a great fun with your machine refurbished to the top.

Posted by Thomas Knappstein (Member # 6134) on October 28, 2019, 11:23 PM:

Hi Paul!
Nice to hear that your machine is coming back to life. I think, the original Main Motor is the key. This Matsushita Motors if they get older and dirtyer can need to much Amperes. It´s too much for the Rectifiers and some other Components on the main Board. I have changed this Motor to a german DUNKERMOTOR GR 42x40 24V 3100U/min. This are ball bearing Motors. Sometimes you can find them on Ebay. I´ve got four GS machines running with this Motors over 10Years now. No Problems over the time. The only Problem is you need the Generator Coil from the old Motor or a assembling by a Segment Disc with opto Coupler.

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