Film-Tech Forum ARCHIVE: Changeover wont close??

my profile | my password | search | faq & rules | forum home

»	Film-Tech Forum ARCHIVE » Operations » Film Handlers' Forum » Changeover wont close??

Author

Topic: Changeover wont close??

John Westlund
Expert Film Handler

Posts: 204
From: Burney, CA, USA
Registered: Jun 2001

posted 07-31-2002 12:27 AM

Im hooking up a Raven Mini-Pac automation that has never worked. The changeover never would open. If I open the changeover with my hand and flip the switch to close it snaps shut. Ive switched the relays for open and close and still the same result. there is a red, white, and black wire hooked up to the automation. There is a white, brown, and black wire coming out of the changeover. Id like to get this thing to work so any help is appreciated.
Thanks, John

| IP: Logged

Ken Layton
Phenomenal Film Handler

Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999

posted 07-31-2002 12:50 AM

The Raven Mini-Pec manual is here on the manuals page. We also use the Mini-pec in the Skyline Drive-in theater in Shelton, Wash.

The wires coming out of the changeover are:
White-COMMON
Brown-CLOSE
Black-OPEN

| IP: Logged

John Westlund
Expert Film Handler

Posts: 204
From: Burney, CA, USA
Registered: Jun 2001

posted 07-31-2002 12:51 AM

I looked at that manual and its nothing like what I have really. Mine says Mini-Pac with an A on the front.

| IP: Logged

Ken Layton
Phenomenal Film Handler

Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999

posted 07-31-2002 01:08 AM

Then try the Edlo Pac manual instead. Edlo Industries took over the former Raven stuff.

| IP: Logged

Darryl Spicer
Film God

Posts: 3250
From: Lexington, KY, USA
Registered: Dec 2000

posted 07-31-2002 09:26 AM

I am mostly familure with the Kelmar dowser units. In those they use selenoids to move the changeover. Maybe one of the selenoids in your changeover has gone bad.

| IP: Logged

John Westlund
Expert Film Handler

Posts: 204
From: Burney, CA, USA
Registered: Jun 2001

posted 07-31-2002 12:32 PM

I should have added that the changeover is a Zipper and is on a Century SA.

| IP: Logged

Randy Stankey
Film God

Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99

posted 07-31-2002 01:14 PM

Do check the solenoid(s) to be sure they aren't burned out.

Try putting a meter on the connections at the solenoid to see if the automation is "asking" the solenoid to open/close.

Then unconnect the lines from the automation and put a continuity/ohm meter on the coils to see if they are open or shorted.

Also, you might try removing the unit from the projector and hooking up a fuse/switch combo to the coil connections and test them out with 120v (or whatever the proper voltage is) to see if they work.
Do keep the pulses short so as not to burn out the coils, in case they were working in the first place.

| IP: Logged

Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000

posted 07-31-2002 08:01 PM

Oh, those "Zippers" seem to have problems. If the coils are good and the COC and COO voltages are reaching the coil and they still don't work, I would recommend the armature shaft (or plunger, whatever you would like to call it) be cleaned and that the drag ball and spring is properly adjusted.

I know this is not politically correct, but I have on occassion removed the ball tension nut and bolt on the top of the douser case and gave it a drop of projector oil now and then. It seems to work for about a year or so before it has to be removed, cleaned, and re-adjusted.

While you are at it, make sure that damned Yogo speedometer cable is not jamming in the tube, and the rest of the linkage operates freely.

| IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.