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Author Topic: CP-500 / switching to dts / problem Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 04-02-2003 02:56 PM                        Yes, but maybe I gave you a wrong clue to mislead you... No, I would never do that! At least not in FHF... The dts-6D viciously inserts its audio signal right into the CP50 signal path before the EQ. You can download the dts manual from a website called film-tech.com and check the connections between the board and the CP for your next clue in this mystery.  |  IP: Logged Karen Hultgren Master Film Handler Posts: 492 From: Agoura Hills, CA, USA Registered: Mar 2000 posted 04-02-2003 04:46 PM                        Don = on the DTS player to the CP50, where the relays are depends on the DTS player you have. If you have a DTS-6D (3-drive unit), then it is on an external board D567. If your DTS player is a DTS-6 (2-drive unit), then the relays are inside the unit and an external board D438-01 (one with "valued" resistors and not jumpers or zero ohm resistors) is used to route the channels. No automation connections are used on any DTS player to the CP50. The CP50 does not change format. When the DTS player is in digital, the player switches out the analog signal and switches in the DTS digital output to the CP50 input. This is physically done by the relays either external or internal to the unit. If you need more information, please let me know and tell me which DTS player you have. Thanks, Karen at DTS khultgren@dtsonline.com  |  IP: Logged Don Bruechert Mmmmmmmmm, bird! Posts: 340 From: Manitowoc, WI, USA Registered: Jan 2003 posted 04-02-2003 07:09 PM                        Karen, thanks for the help. We have two of them, both would be DTS-6. The one in question uses caddies to hold the disks. So if I understand you correctly, the CP50 will switch to the Dolby Stereo with Surround mode via the automation, and the DTS player will substitute its signal for the analog signal from the film - with no visible indication on the unit?? There fore if it SOUNDS like DTS, even though the CP50 says it is in D Stereo Surround mode, then it is working properly? Maybe the reason the guy who taught me expected it to switch is because the CP50 in our SDDS house does switch formats when SDDS data is present.... Thanks again.  |  IP: Logged Karen Hultgren Master Film Handler Posts: 492 From: Agoura Hills, CA, USA Registered: Mar 2000 posted 04-02-2003 08:33 PM                        Don - in the DTS-6, when the unit switches to DIGITAL, it keys it's internal relays to switch OUT the analog signal from the CP50 (coming in on "JM11" connector on big 50-pin cable) and switch IN the DTS digital signal (at "JM21" on the big 50-pin cable). Look at the wiring diagram pg. 37 in the manual, it will make more sense to you. No automation pulse is used. The DTS-6 player will switch it's internal relays whenever the DTS-6 player is in DIGITAL, no matter what format the CP50 is in. On the back of the DTS-6, "BS22" connector on the big 50-pin cable is the automation logic and that cable should not be connected to the CP50. That is also shown in the DTS-6 manual page 37 (in manuals dated Nov96) wiring diagram: DTS-6 to CP50. Hope this helps. Karen at DTS khultgren@dtsonline.com  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 04-02-2003 09:59 PM                    This is very interesting as it may explain an outage I had about a year ago at the start of a film (no trailers). CP500/D & DTS-6. Starting with the CP in SR-D mode (allowed sans DD playback there is no reversion to SR until a motor run relay signal is received) I just let the DTS pulse itself online. In this particular case there was no sound. I bailed out to SR-D and could not reproduce the situation in later testing. The moment I roll film reversion to SR takes place and a second or so later DTS pulses the CP to Format 11. So what's the theory here? That the DTS pulse somehow coincides with the moment of reversion? Very strange. DTS kicks in quickly but it couldn't have kicked in as fast as reversion takes place since that's the instant the motor rolls. But maybe the best prevention is to leave it on SR when starting a film to be run in DTS.  |  IP: Logged Oliver Pasch Film Handler Posts: 53 From: Europe Registered: Jun 2002 posted 04-03-2003 01:45 AM                    I've just found a Dolby Field Bulletin 228 (CP500 Does Not Respond to Automation Commands / Add Filtering on Cat. No. 684 Board)that i will not post here for copyright reasons, but although they are talking there about problems with mute(!) switching between filmsound and non sync, this sounds pretty much as if this might be the reason for the problem we're discussing here. Modification on cat. 684 is recommended, althought the reason for the problem is supposed to be external (of course...) due to "Intermittent external noise on the automation lines" (like that!).  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 04-03-2003 08:06 AM                    That would not have explained my anomoly as NS & Mute were not involved AFAIK.  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 04-03-2003 08:46 AM                        Still, Oliver has a good point here. Both problems involve external format change commands, in one case N/S, in the other dts. While in the FB noise on the automation input is identified as the source of the problem, in the other it is parallel commands which probably have a very similar effect. It would be helpful to know if the mute LED next to the front panel fader comes on, but I don`t remember.  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 04-03-2003 02:51 PM                        Michael Once I connected some leds to the 5v outputs of the CP500. I noted that when DTS was playing the "NS" led was on. So CP500 considers DTS as a Non Sync format. Karen So for Dolby DTS is just an "Intermittent external noise on the automation lines" Bye A  |  IP: Logged Karen Hultgren Master Film Handler Posts: 492 From: Agoura Hills, CA, USA Registered: Mar 2000 posted 04-03-2003 07:49 PM                        Please be aware that the scenerio I was talking about with Don has to do with DTS-6 to a CP50 *ONLY*, and do not necessarily apply to other CPs or DTS players. Thanks, Karen at DTS  |  IP: Logged

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