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Author Topic: SRA-5 Schematic/Help Needed - No sound Matt Close Expert Film Handler Posts: 226 From: Hervey Bay, QLD, Australia Registered: Sep 2001 posted 08-24-2004 07:15 PM                        Does anybody have a schematic or technical info on the Dolby SRA-5? Mine blew a fuse and now doesn't pass through any sound! Any help and advice is welcome too!  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-24-2004 07:44 PM                        Replace the fuse. Actually, there is some documentation in the manuals section. Not sure what it is, I don't have time to download it on dialup here. SRA-5 and the SA-5. edit: thought I had pasted in two SRA-5 links, not one for the SA-5 [ 08-24-2004, 09:13 PM: Message edited by: Daryl C. W. O'Shea ]  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-24-2004 08:23 PM                     The SA-5 is a CP-100 stereo surround adapter... The SRA-5 was made during Dolby's dark years on documentation...it and the Cat 113C were done around the same time. There is virtually no doucmentation on the schematics of the unit that I am aware of (though there must be some, I don't think they have ever made it to any sort of publication). Change the fuse and in the mean time wire around the SRA-5. In a CP-200 type installation, the sound must pass through the SRA-5 and it will indeed nix the sound. It is good to have a bypass fanning strip handy just in case. Steve  |  IP: Logged Matt Close Expert Film Handler Posts: 226 From: Hervey Bay, QLD, Australia Registered: Sep 2001 posted 08-24-2004 09:06 PM                        I was actually using it with a JS-200 Ultra-Stereo processor. What a huge difference it makes over the USL SR card!!!! Anyhow, I have now discovered that if you power down the SRA-5, you here the sound that has been passed through the cards for a split second until the caps discharge...... I know it is the processed sound I am hearing because you can't hear it if the cards aren't in. So, I guess I am looking at a control/logic problem. I see there is a CD4052 chip in there for signal switching, but I don't know what goes where, or what rails should have what on them to trigger what!?!? ... if you get the drift..... so I am hoping someone either has schematics or has struck the problem before..... Even the pinouts for the CAT280T cards would help, so I could see where the signal is making it to before it is interrupted.  |  IP: Logged Matt Close Expert Film Handler Posts: 226 From: Hervey Bay, QLD, Australia Registered: Sep 2001 posted 08-25-2004 12:36 AM                        Don't worry ... Found the problem holding the 'inhibit' leg high on the CD4052. All good now.  |  IP: Logged

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