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Author Topic: Dolby CP-55 bizarre wake-up? George May Film Handler Posts: 60 From: Bath, United Kingdom Registered: Nov 2001 posted 05-30-2006 05:09 AM                        Symptoms: When switched on, my CP-55 goes straight into Bypass mode. If I then remove the Bypass mode fuse from the CP-50 power supply unit it switches to normal operation and works fine. Replacing the bypass fuse again causes it to go back into Bypass mode. I've cleaned the contacts on the Cat 249 and Cat 250. It makes no difference. I can live with it, but what's happening? Can anyone help? Thanks George  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-30-2006 09:30 AM                     I'd be willing to wager it is your Cat 249 card. There is a circuit on that card that determines if all is okay with the main rails and if not, go to bypass. It, no doubt has an issue or possibly, one of the main power rails is indeed out of spec and it is properly trying to switch to bypass to get you to RXO the Cat 249 card. Which will probably need to be upgraded to the Cat 249A (a better card).  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 05-30-2006 10:46 AM                     George, had the same problem and it was indeed the Cat 249 card.  |  IP: Logged George May Film Handler Posts: 60 From: Bath, United Kingdom Registered: Nov 2001 posted 06-02-2006 06:58 AM                        Thanks guys. Steve, you win your wager. Replacing the 249 fixed the problem. George  |  IP: Logged

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