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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Problem with CP500D Volume knob.

Author Topic: Problem with CP500D Volume knob. Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 07-25-2002 12:32 PM                     Hi all, Long time no see. I seem to be having a problem with one of the theaters I am working in. On the DOLBY CP500. The problem is that both a clockwise and an anticlockwise rotation of the volume knob leads to an increase in the volume instead of a decrease. Can someone give me a clue what is the problem and how can it be solved? Thanks all. Demetris Thoupis  |  IP: Logged Chase Taylor Expert Film Handler Posts: 175 From: Troy, Alabama, USA Registered: Mar 2001 posted 07-25-2002 01:52 PM                        We had the same thing happen to use. I don't know what they did to fix it because it was under warranty and they just sent us a hole new front for the CP-500. We just swaped them out. Moral to the story is Call Dolby.  |  IP: Logged Ken Jacquart Film Handler Posts: 82 From: San Francisco, CA, USA Registered: Mar 2000 posted 07-25-2002 02:10 PM                        Your shaft encoder has a problem... you will need to order a repair/exchange of a CP500-FP (front panel). Just call your service company/dealer with that information and serial number of the unit... ken  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 07-25-2002 05:23 PM                     It is either the shaft encoder or perhaps an evil software download by a film producer to prevent theatres from lowering their volume levels The shaft encoder has two output that form a quadrature pulse. If one is stuck high or low and the other one still functions, the decoder will interpret this as to go in the one direction. Steve ------------------ "Old projectionists never die, they just changeover!"  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 04-26-2013 09:31 PM                 It has been 3928 days since the last post.  |  IP: Logged Reed G. Hinton Film Handler Posts: 5 From: Green Bay, WI Registered: Aug 2003 posted 04-26-2013 09:31 PM                     How do you remove the knobs from the Dolby CP500 and also, how do you remove the knobs from the Dolby CP65? I want to take them off so I can remove circuits and clean. Thank you. Reed G. Hinton  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 04-26-2013 10:34 PM                     Hi Reed: The short answer is you do not remove the knob from the CP500. The encoder is easy to damage and new/exchange front doors are very hard to come by. Use anti-static canned air to blow dust out of the fans, off of the circuit board and around the knob. On the CP-65, carefully pry out the center cap of the fader knob. There is a nut under there that you loosen and carefully pull the knob off. Then pull the silver detent "sub-knob" off. The actual pots in the CP 65 are sealed and cannot be cleaned. BTW your cables will be heading out tomorrow.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-27-2013 06:00 AM                        I have shaft encoders for cp500 in stock. Yes, if you are careful, they can be changed out. Louis  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 05-02-2013 08:54 AM                     Louis, are those after market parts? I thought Dolby only offers the entire front panel.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 05-02-2013 09:25 AM                        That is correct, now, but I did purchase encoders from Dolby back then. They have repaired the problem every time I swapped them. Also have fans. (Sometimes the display is OK.) Louis  |  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.