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Big problems with Seitz amplifier


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#1 IgorSavatovic

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Posted 29 September 2004 - 11:27 AM

Hi Everyody

I have a big problem and any kind of help will be very appriciated!! I bought a seitz FF and Heden m26p motor, few month ago from a operator based in LA! When I talk to him (through emails) he asured me that everything was OK with the system. The motor had a gaffer tape across the pot, but he assured me that everything is alright and I don't have nothing to worry about! So I ordered the packege! When system arrived, I tried it, but when I conected the motor, motor started to turn uncontrolable to one side! After some time I noticed that the problem is in loose potenitometer at the motor. When you move it a litlle the uncontrolable movment stoped. Anyway the motor was not usable without it's bracket. After few days I noticed that the motor is moving slower in one side! I contacted Heden in Sweden, and Magnus was so kind that he fixed the broken pot for free (Thank you Magnus ), even if the motor was almost 20 years old!

So the motor is like new now, but it still roates slower to one side (the speed in other side is normal). When the system is conetcted for longer time to the power suplly, the speeds on both sides are almost the same! (when the amp worm's up!!!)

I took it to the service, here in Zagreb, Craotia, and a service guy told me, that the problem is in amplifier (Seitz, Model 8725 dual channel), but all integrated circuits in it are without any label or code, so he doesn?t know what exactly should be changed in it!!

So I would be very grateful if someone can help me with some blueprints or schemes of Seitz, Model 8725 dual channel amplifier, or some emails were I could contact someone for this blueprints or schemes!! There is no email address at the official Seitz web site.

This would be much easier than send it to repair to Seitz since I?m located in Croatia (Eastern Europe)

Any help would be very appreciated,

Thanks, Igor
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#2 IanMcMillan

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Posted 29 September 2004 - 03:27 PM

Hi Igor,
You could try for Scott Lake who I dealt with at Seitz a couple of years ago. I don't know if he is still there.
Email scott@seitz.com
Hope you can sort it out.
Macca
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#3 IgorSavatovic

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Posted 29 September 2004 - 03:39 PM

Thanks Ian for your help, but seems that this email adress does not work any more!

Any other suggsestions

igor
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#4 Gus Trivino

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Posted 30 September 2004 - 07:09 AM

Hi Igor:

My name is Gustavo, and I have the same Follow that you bought.
I am not using the Seith, only have that for Backup.
I can send you the manual for fax or maybe x e-mail if I can digitalise it.

I have a telephone number of Seitz:
Seitz Technical Products, Inc.
Fax: (610) 268-2229 Phone: (610) 268-2228
729 Newark Road P.O. Box 338 Avondale, PA 19311

Best,

Gus.
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#5 Gus Trivino

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Posted 30 September 2004 - 11:12 AM

Igor:

I sent you an email with more information.
Gus
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#6 IgorSavatovic

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Posted 07 October 2004 - 03:38 PM

Hi everybody

I manged to repair the amplifer in my Seitz system! First of all I want to thank everybody for your helping emails, especially Ben - Unitcine, Josh - Seitz and Magnus - Heden!

The problem was in some "Consdensers" (I hope that this is the right word), and very old wires that need some welding!! The most anoying of all break downs. The engenier just need a lot of time to check every wire and old "condensers", and after a lot of time seems that he repaired it!

Once more, thanks everybody, you helped me a lot!!

Sincerelly, Igor
:D
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#7 Ben Fisher

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Posted 08 October 2004 - 04:31 AM

Hi Igor,

Chuffed that you got it sorted, I love the retro terminology:

Condensers (capacitors)
Welding (soldering)

Bring back those days I say....


Ben Fisher
www.UNITCINE.com
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#8 IgorSavatovic

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Posted 31 January 2005 - 10:27 AM

Hi everybody

It's been sometime since I posted my first post about Seitz problem, and FINALLY a month ago I solved it. The guy who serviced it before, acctully didn't made it!! I took it several times to service, after the last post, and when I almost bought a new FF system (sorry guys, I will wait a lillte bit more with new FF aquisiton, but thanks for all offers) I found a guy who is servicing radio controls for plane and car models, and he solved everything in one day!!

The problem was, offcourse, with amplifier. I had some switch (I don't know what was for) near second chanell, that caused many problems, and he removed it. The system is much more precise now. There were some other problems, but I don' know how to explain it on english?? (sorry!!!!)

Something with the transmiter, meanwhile, also gone wrong!! It automaticlly switched from RF to Cable, but there was no cable attached!!! He also repaired it, and he changed the potentoiometar, on the transmiter because it was causing "jerky" movements of the motor.

Anyway, I'm posting this because if someone needs to repair his Seitz (or some other FF) in Eastern Europe or somwhere near Croatia, I think taht this guy can help??!! This are his contacts:

Sanjin Svetlicic

sanjin@koch.hr



regards, Igor
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#9 Dave Schwartz

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Posted 04 January 2006 - 12:06 AM

I had some switch (I don't know what was for) near second chanell, that caused many problems, and he removed it. The system is much more precise now.



Wow, I just came across this post nearly a year later. The switch was used to change between normal two-channel mode and slave mode, where two motors could be used simultaneously to turn a sticky or cold lens. If you were set in slave mode and used only one motor in Channel 1, it would behave as Igor described.

One other subtle feature of the Seitz amplifier is that the two channels have two different "personalities." Channel 1 is optimized for focus, providing maximum speed and long travel. Channel 2 is optimized for iris, providing slower speed over shorter travel, but with a smoother response.

I used my Seitz for many years before migrating to a BFD. It's still a damn good system and worth looking into for a budget-minded operator just starting out.

David Schwartz
d.a.schwartz@verizon.net
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