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Author Topic: Cable to connect C.E. Reader to CSP1200 Ian Bailey Master Film Handler Posts: 317 From: Nambucca Heads, Australia Registered: Jun 2003 posted 09-30-2005 07:58 AM                     What is the best cable to use to connect a Component Engineering red led reader to the input of a CSP1200 processor. Is it best to use crimped connectors on the end of the cables which go into the screw terminals or just solder the wires before terminating? Is the shield connected at both ends?  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 09-30-2005 02:35 PM                     I always solder everything, less possibility of a noisy connection in the future. Both CE and BACP say in the instllation manuals to connect the shield at both ends for proper operation. -Aaron  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 10-01-2005 01:55 PM                     I use belden 9451 the most 9452 in noisy enviroments  |  IP: Logged Ian Bailey Master Film Handler Posts: 317 From: Nambucca Heads, Australia Registered: Jun 2003 posted 10-02-2005 07:01 AM                     Thanks guys. I'd assume that it is best to run the cable with no joins anywhere? Why I'm asking that is because I have developed a slight hum in one auditorium(only in analogue sound)-the hum stops if you block the red led with a business card.I traced the path of the cable and found 4 places where the cable was joined at terminal blocks and even one twist join.I want to connect a whole new piece of cable to prove where the fault is.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-02-2005 08:46 AM                     If the hum stops when you block the LED...then it is not in the CSP1200 or your wiring...it is in the LED power supply or stray light or the reader itself. If you have the hum with the film out of the projector but LED lit, change your LED supply...if you need to have film running in your projector for the hum, I would ask if you have a digital system basement reader in there too...if so, then odds are the digital LED is causing the perforations to refract the light back onto the optical pick up...Kelmar has this problem and include a light shield for their optical reader to prevent this.  |  IP: Logged Ron Yost Master Film Handler Posts: 344 From: Paso Robles, CA Registered: Aug 2003 posted 10-02-2005 01:58 PM                     Try running a short wire to connect the reader ground with the projector/sound head frame. I ran a wire to one of the screws that had held the original exciter assembly. The low-level hum is gone! This was with a BACP reader, tho. Ron Yost  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 10-02-2005 02:20 PM                     The cable from the reader to the processor must be splice free and shielded the entire run The shield terminates at both end Since blocking the LED removes the hum I would suspect the powersupply has issues  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-02-2005 05:23 PM                     Gord, I was referring to the LED power supply...hence blocking the LED supply removed the stimulus for the hum. A grounding issue will not be affected by the presence of the light source. As to the shield being terminated at both ends...there is good and bad to it...technically it isn't the best way since the screen is now the reference as well. The key is that both the reader and the preamp must be at the same reference. Additionally, the signal must be shielded. The easy way is to connect the shield at both ends. The better way is to run a separate large gauge wire to bond the reader at the same ground/ref potential as the preamp and then use the shield for just shielding and tie it only at the processor end.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 10-02-2005 07:37 PM                       Once again I agree with Steve Guttag. Hmmm. This is the bst way but geting installers to run a new wire in a retrofit situation is very difficult.  |  IP: Logged Ian Bailey Master Film Handler Posts: 317 From: Nambucca Heads, Australia Registered: Jun 2003 posted 10-03-2005 07:55 AM                     Steve-I haven't checked it without film (I will do that tomorrow) and no I don't have a digital basement reader. I will replace the cable anyway to reduce the chance of any problems due to the number of joins. Are these power supplies repairable? If not,do I have any choices in models or brands of supplies? I know that the previous owner had trouble with one of the power supplies and they used a supply out of a computer(switched mode supply)as a temporary measure until the faulty one was repaired or replaced.So I assume these readres just run on 5 volt DC-is that correct?  |  IP: Logged

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