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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » I'm sure you have all had days like this - CP65

Author Topic: I'm sure you have all had days like this - CP65 Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 07-17-2007 10:29 PM                     It started with the upgrade for dts processors to ....043 I went to the theatre. Masking tape on DTS XD10 "Doesn't work" I boot it up....Initializing... Called DTS sorry this is not a field repairable problem. OK...Installed new DTS XD10 upgraded to ...043 Everything is great?? Whats this..no sound when trying to set pink noise levels from DTS processor? Thats OK I have a Dolby CP65, I'm sure this is an easy solution. Remove CAT 150, put in Cat85 (pink noise generator) hmmm...sounds pretty good. DTS unit is now working. DTS unit is outputting pink noise into 6 channel audio input on CP65. Set all channel levels from Cat85. Set all output levels from DTS XD10. Life is grand! Remove Cat 85, install CAT 150. Turn CP65 back on. What?? Wheres my sound from Digital? Several undocumented steps later and about 4 hours....... Note that CP65 only produces sound when pink noise card is inserted but not CAT150. Suspect that CAT150 is causing some type of failure in CP65. Reference shematics and note that regulator CAT 249 supplies 24 V to Cat 150. Note during power up that LED on CAT 249 for 24 V looks dim when CAT 150 is inserted. Noted that Cat 249 24 V LED looks fine during power up with pink noise card inserted. Noted that banging on back plane around femake connector for control card causes processor to start working. Keeps working when pink noise card is inserted works for about 20 seconds when CAT 150 is plugged in. Concluded that CAT150 is drawing more current than CAT85. Assume that regulator CAT149 is incapable for some reason of supplying correct power and must be running in bypasss mode. Run 69T film in projector with CAT 150 plugged in. Hear Dolby tone in all formats selectable from front panel including non sync. Hmm... this is odd? Banging on backplane with screwdriver yeilds repair with Cat85 plugged in. Banging on backplane with screwdriver yeilds about 10 seconds of normal operation with cat 150 plugged in before audible relay click cuts off sound. Conclusion...voltage regulator is unable to meet the current demands of CAT150. Voltage regultor card is causing CP65 to go into automatic bypass. Voltage regulator card is dysfuntional. Any ideas or opinions?  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 07-18-2007 01:44 AM                     checked traces on the backplane for any breaks in the solder connections? Maybe a new backplane is in order... good luck on this one .. - Monte  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 07-18-2007 08:45 AM                     I've had the regulator card fail a few times over the years on both 55's and 65's. It happens. Mark  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 07-18-2007 12:12 PM                     When we had a 249 fail in our CP65, it had char marks on it (still worked though, just not so well). Something to look for... --jhawk  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 07-18-2007 12:21 PM                        The 249 card has too low of a output current for a CP-65. You will require a 249a which has considerably more current output. The 249 was barely adequate for an unmodified CP-55; running at 99.5% of rating. Add SR and 150 card and you are over. Louis  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 07-18-2007 01:16 PM                     If the pink noise works whith teh Cat. 85 card in place but the processor doesn't work normally with the Cat. 150, have you tried swapping the Cat. 150?  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 07-18-2007 09:53 PM                     Not yet. Good information on the 249 and 249a. This unit has a CAT224 and 2 CAT300's. I'll publish my fix when I find it.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 07-25-2007 07:47 PM                     Swap the cat150 entirely or replace the bad diode on the control line of the cat 150. Look at the D403 or the DZ405 diodes.  |  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.