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Author Topic: DTS - What LED bulb is used? Tissa DeSilva Film Handler Posts: 36 From: Toronto, Ontario, Canada Registered: Jul 2007 posted 01-12-2008 11:46 AM                     Hi Can anyone tell me what is the size , voltage and power of the Red Led bulb used in DTS Readers. and where we can buy them? Thank you in advance. [ 01-15-2008, 01:39 PM: Message edited by: Aaron Sisemore ]  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 01-14-2008 11:15 AM                     I have 0% practical experience working with DTS systems but I do have a couple of equipment manuals here and I can't find any reference to the LED other than that the proper operating voltage for it is 4V. I can't find any other specs or even a replacement part number for it in the manuals I have. Your best bet bet might be to contact DTS directly for the info you seek.  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 01-14-2008 05:38 PM                     DO NOT EVER put 4V across a red LED. It will FRY. The 4V is measured on the READ side of the reader, and is adjusted by adjusting the gain of the reader side, NOT the LED voltage. The LED is fed through a fixed resistor, and is not adjustable.  |  IP: Logged Tissa DeSilva Film Handler Posts: 36 From: Toronto, Ontario, Canada Registered: Jul 2007 posted 01-14-2008 08:59 PM                     Do you know what Red led buld it use? I remember its 2.5 MM led. But I want to know where to buy and what are power or bright requirments.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-15-2008 12:09 AM                     Contact Gord McLeod...I know he has the LED's and he also does rebuilds of the TCR. It is no easy task to replace it.... Mark  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 01-15-2008 02:58 PM                     Wouldn't it be easier to do an repair/exchange with DTS on the readers? Will DTS not do this with the Canadian theatres like they do with us here in the States?  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 01-17-2008 01:34 AM                     quote: Bruce Hansen The 4V is measured on the READ side of the reader, and is adjusted by adjusting the gain of the reader side, NOT the LED voltage. Interesting... here's a hypothetical question. Assuming every aspect of a reader is in perfect working order and calibration other than the LED and reader. Would the most common case for failure be attributed to the LED fading or the reader elements losing their sensitivity? What is the reader element?  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 02-16-2009 10:31 PM                 It has been 396 days since the last post.  |  IP: Logged Eric Webb Film Handler Posts: 40 From: Atlanta GA Registered: Oct 2004 posted 02-16-2009 10:31 PM                     Does anyone know where find the led voltage fuse on the D422 board as stated in the DTS6-D system testing and troubleshooting guide in the manuals section of Film-tech? Because recently when I power on the DTS6 unit the reader led does not light but the player boots up fine. Any ideas?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-16-2009 10:58 PM                     Try a different reader first. I don't think there is a fuse in the 6-D, there is one on the 6 though. Hopefully Mike Smith is still out there.... he could tell you for sure... Mark  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 02-16-2009 11:16 PM                     Had a DTS-6 do the same thing: boots up, green light on reader stayed on for a few seconds then drop completely. Had to send the unit and reader in to the place in NY and they overhauled the unit with new SCSI cards, DVD Rom drives and repair the timecode reader section of that one particular card. They also replaced the reader when I got the player back. -Monte  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 02-17-2009 01:59 AM                     Measure between pins 5 and 6 on the DB9 cable that plugs into the TCR. If you have 5 VDC, then your supply voltage is good. --jhawk  |  IP: Logged Mike B. Smith Film Handler Posts: 82 From: Universal City Registered: Nov 2004 posted 02-17-2009 01:34 PM                     There is no fuse in the Timecode reader head. Power from the head comes from the player, the DTS-6 has a fuse for the 5V power located on the 422 board,(the one with the status LED's). Fuses are located near the top of the board by the rear connector. On early units this fuse was soldered in and looks like a small reisitor, later units had the plug in type fuse, it was changed again to the resetable type fuses in 6D's. Prior to blaming failure of the LED verify you are getting voltage to the head. On the 9 pin TC cable pin 6 should be ground and pin 5 is the +5V Verify you are getting power to the head  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 02-17-2009 07:48 PM                     Be careful, DO NOT short the 5VDC to ground (or anywhere else). To see if the LED (or wiring to it) is bad, check the voltage across it (where the wires connect to the board). If the LED is bad, it will not be drawing any current, and there will not be a voltage drop across it's current limiting resistor, so you will see the 5 volt supply voltage across it. If there is no voltage, but there is 5 volts being supplied to the reader, then check the current limiting resistor. It is R15 a 360 ohm resistor. A good red LED will have about 2 volts across it. BTW, an LED is a current opperated device, not voltage opperated.  |  IP: Logged

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