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Author Topic: SR Cat 280 to 280T mods Brad Morris Film Handler Posts: 29 From: Los Angeles, CA, USA Registered: Feb 2002 posted 11-15-2004 12:07 AM                     Does anyone have the sheet that describes the jumber mod. needed to convert the Dolby cat. 280 to a 280T (SR playback only)? Many thanks.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 11-15-2004 12:41 AM                     Brad: It is an easy mod, you need to cut the tiny jumper marked "J801". If you look down at the top of the connector end of the card, holding the connector to your left, it is on the bottom board in line with the first of the second group of contacts ("A") (under the word "Switch" on the top cover). IIRC, the Dolby website has the modification sheet archived. Since you're local in LA, email me if you need more info/help! Edit: Thanks, jhawk!!  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 11-15-2004 12:42 AM                     Brad, This is covered in a bunch of threads, including: Converting a Cat 280 SR to a Cat 280T SR Dolby CP50 up grade to SR and Non sync switching proble It's really easy. Also, I strongly recommend following Steve Kraus's suggestion of prominently stickering the card with "modified for playback only." --jhawk  |  IP: Logged Brad Morris Film Handler Posts: 29 From: Los Angeles, CA, USA Registered: Feb 2002 posted 11-22-2004 10:53 PM                     Thanks to all for help with the mods. Now my CP200 puts out pink noise instead of Dolby tone. Is this standard with SR cards? Cheers- Brad  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 11-22-2004 10:57 PM                     I can't speak to the CP200, but the SR cards use "Dolby Noise" instead of "Dolby Tone" for calibration. This is mostly irrelevant for optical sound, since you always calibrate with Dolby Tone... --jhawk  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-23-2004 06:05 AM                     The Dolby Tone or Dolby noise is generated by the noise reduction card so when you have an SR card installed, it outputs what it knows. The CP200 has always used the NR card to generate its tone (format 66) so when you replaced the NR card, you took its tone generator...generally only important when setting up Cat 64s made prior to the Cat 64B Steve  |  IP: Logged

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