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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » DA20 2 Projector Wiring

Author Topic: DA20 2 Projector Wiring Markus Lemm Expert Film Handler Posts: 113 From: Ottawa, Ontario, Canada Registered: Nov 2005 posted 02-10-2009 04:26 PM                        Got a DA20 about a month ago. Was running Dolby Digital on a single projector when running a film on tower. System works great. Now I am setting up to run on both projectors. I have changed the start switches on both projectors so that each one closes a connection when the motor starts and the lights on the DA20 Proj and Motor go on for each projector. The problem is that the DA20 reverts back to projector 1 a few seconds after a change-over to projector 2. Is there something other than motor start signals that I need to do? Thanks. Also I can't seem to find the wiring diagram for a DA20 to CP55.  |  IP: Logged Jarret Chessell Master Film Handler Posts: 288 From: London, Ontario, Canada Registered: Jan 2009 posted 02-10-2009 04:34 PM                     Greetings, The manual you need for the DA20 is right here on film-tech. It sounds to me like the relay isn't staying closed for the projector. It needs a normally closed connection for projector two, not a momentary pulse.  |  IP: Logged Markus Lemm Expert Film Handler Posts: 113 From: Ottawa, Ontario, Canada Registered: Nov 2005 posted 02-10-2009 05:21 PM                        The manual that I downloaded does not have the fold-out figure 2.9 or 2.10. The switch stays closed as long as the projector is running. What do you mean by relay? For projector 1 pins 1-5 are closed for projector 2 pins 5-9 are closed, should 1-5 open when 5-9 closes and vise-versa? Thanks for the quick response.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 02-10-2009 05:41 PM                        Do you have anything connected to the "auto c/o" terminals on the back of the CP55? These contacts need to be closed when projector #2 is selected. Does the "projector 2" light on the processor (not the DA20) stay lit when projector #2 is selected? Does everything work correctly for optical sound?  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 02-10-2009 07:09 PM                     Markus: You need to have pin 25 of the "DA-20 CP Sense/Control" tied to the Auto C/O terminal on your CP55 to give the DA 20 the changeover command. The other pin of your C/o (Gnd) should be connected to pin 12 of that connector. Don't change your current setup on the motor start connector..the DA20 needs to know whenever either or both motors are running. And the motor start signals MUST stay on whenever the motor on that machine is running. The best way is to have a relay on the motor power leads, the contacts of which control the DA-20. DO NOT connect the motor leads directly to the DA20 or you will create a very smoky expensive mistake. For Format and automation control to a CP55 the connections are using the connector I referenced above: (This info is on pdf page 27 of the manual here on F-T) DA-20 Pin; CP-55 Fanning strip 1; S0 (01 mono) 2; S1 (05 SR) 3; S2 (04 Dolby A) 4; S3 5; S4 (22 mag) 6; S5 7; S6 (60 N/sync) 8; S7 (10 Dolby Dig) 12; GND 25; TB2, "Auto C/O"  |  IP: Logged Markus Lemm Expert Film Handler Posts: 113 From: Ottawa, Ontario, Canada Registered: Nov 2005 posted 02-10-2009 07:22 PM                        Optical (Dolby SR) sound works perfect for change-overs. It must be the pin 25 to c/o connection. I will check it and test it tomorrow. Thanks again.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 02-10-2009 08:17 PM                        Normally the motor voltage drive a relay for each machine. Therefore when proj 1 motor is one, you have a closure; ditto for #2. Projector 1 motor then goes off dropping the #1 relay. Digital is controlled solely by motor relay closures. (Analog changeover is completely seperate. Louis  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 02-10-2009 10:52 PM                        It's not really *completely* separate because if the DA20 does not see the c/o command, it will revert to the first input, as the original poster observed. Therefore, the c/o command must be installed the way Tony laid out. So, both the continuous motor signal and the c/o signal are needed.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 02-11-2009 12:20 AM                     Deleted.. [ 02-11-2009, 10:34 PM: Message edited by: Monte L Fullmer ]  |  IP: Logged Markus Lemm Expert Film Handler Posts: 113 From: Ottawa, Ontario, Canada Registered: Nov 2005 posted 02-12-2009 01:23 AM                        It was the pin 25 to c/o connection. Works great now.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 02-12-2009 01:37 PM                     Markus, glad to hear the problem is solved.  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

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.