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Author Topic: DTS LED voltage Richard Tucker Film Handler Posts: 15 From: Austin, TX, USA Registered: Apr 2001 posted 07-20-2003 11:47 PM                     I replaced some old DTS readers about 8 months ago, and I am having to go back already and adjust the LED voltage. Some of these are now maxed out on the pot, and a few won't even come up to 4 volts. Anyone else having this problem? Did DTS get a bad batch of LED's? And is it possible to change these LED's in the field?  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 07-20-2003 11:57 PM                    I would probably get with DTS and explaine the problem to them and try to get another repair/exchange on them. If you mess with them and screw something up they may charge you for a new reader.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-21-2003 08:05 AM                       DTS readers are adjustable?  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 07-21-2003 02:41 PM                     quote: DTS readers are adjustable? Yes, they are. There is a procedure to reset the LED voltage to compensate for LED wear and subsequent mistracking of the timecode. I used to have a PDF file with detailed, warranty-safe (Karen's hands in the pic doing the example adjustments!) instructions on how to accomplish it. IIRC, it worked with a certain version and above, the early readers cannot be adjusted and would need to be returned for repair/exchange. Ask Karen for the LED voltage adjustment instructions. -Aaron  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 07-21-2003 04:06 PM                        You can download DTS led adjustment procedure on the DTS site on the Techcenter section. Bye A  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 07-21-2003 08:49 PM                     You mean we don't have them here on F-T?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 07-21-2003 08:56 PM                     It's in the queue to be added and is an important thing to check that most people don't know about.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-22-2003 12:39 AM                       Humm... that must've been something that happened after I left the service biz.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 09-19-2004 05:50 PM                 It has been 425 days since the last post.  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 09-19-2004 05:50 PM                     BTW, when making this adjustment, do not shine a bright light into the reader while making this adjustment. The light can shine on the cell, and effect the reading. (been there, done that). If you are having problems getting 4 volts from the test point, try cleaning the LED, the lens, and the cell (remove the board from the reader, the cell is on the back of the board). ...And BTW, the pot adjusts the gain of an op amp, not the LED voltage. You can prove this by tracing the board traces. The LED is fed by the power supply through a fixed resistor, the pot is connected to the op amp. If you want to look at the output of the reader, but do not have the special cable, if you have the back off the reader put your scope probe on the upper lead of R-5 (the lead that faces the pot).  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-19-2004 05:59 PM                     Also be sure there is no film threaded through the reader. MArk  |  IP: Logged

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