Film-Tech Forum ARCHIVE: Pro 35 Power Supply

This is topic Pro 35 Power Supply in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Michael Voiland (Member # 5386) on 10-23-2009, 04:28 PM:

Does anyone know the voltage of the pro 35 change over solenoid one of the power supply died on one of the ones we have.

Posted by Mark Gulbrandsen (Member # 72) on 10-23-2009, 06:28 PM:

Usually it's the electrolytic capacitors that fail. Some times the relay. Generally they are easy to repair and shouldn't need to be replaced.

Mark

Posted by Michael Voiland (Member # 5386) on 10-23-2009, 10:44 PM:

I think its just a little transformer. I just was wondering because I haven't had the time to go over and look at it yet.

Posted by Gordon McLeod (Member # 33) on 10-24-2009, 05:04 PM:

The transfomer is one with poor voltage regulation for a reason
under no load it charges a cap to around 100volts which supplies enough umph to lift the changeover blade and then maintains nominally 24volt to hold it up

Posted by Mark Gulbrandsen (Member # 72) on 10-24-2009, 07:12 PM:

Just change the cap... really, its perhaps a 10 min. job for even the inexperienced. Be sure to get the polarity on the new cap the same as the old one! I believe you'll find it on the rear of the little chassis. Fixes the problem 98% of the time. The other 2% may be related to a bad relay.

Mark

Posted by Michael Voiland (Member # 5386) on 10-25-2009, 11:25 PM:

Ok I will do that when I get over to that theater.

Posted by Michael Voiland (Member # 5386) on 01-25-2010, 05:14 PM:

Off hand you wouldn't happen to know the voltage and capacitance of the capacitor would you.