Film-Tech Forum ARCHIVE: CP500 issue

This is topic CP500 issue in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=009484

Posted by Travis Cape (Member # 466) on 08-21-2008, 08:14 PM:

I am stumped. I tried running a film on projector two in a dual projector booth today and couldn't get any analog sound. This machine has a Kelmar reader, both the preamp and the LED lights were on, on the power supply, and the CP 500 did changeover to proctor two. I inspected all the wiring, as I haven't run that projector in six weeks. Projector one was just fine.

I would suspect the preamp, but while the film was running, I started to set dolby level and the film sound came on briefly. Because of that, I assume that if I thread dolby tone that I can set that, but still no analog sound in any format.

Thoughts?

Posted by Jeremy M Smith (Member # 4913) on 08-21-2008, 08:27 PM:

Have you tried pressing the bypass button to see if that makes a difference

Posted by Travis Cape (Member # 466) on 08-21-2008, 08:39 PM:

I tried bypass and turning the processor off and on. None of that helped.

Posted by Monte L Fullmer (Member # 2797) on 08-21-2008, 10:04 PM:

Sounds like that changeover mechanism from Proj. No.2 isn't pulsing the processor over to receive that signal from No.2's soundhead.

Posted by Travis Cape (Member # 466) on 08-21-2008, 10:13 PM:

Monte, the light on the preamp for projector two does light and the screen display indicates P2.

Posted by Monte L Fullmer (Member # 2797) on 08-21-2008, 10:43 PM:

Try this one then: power down the 500, pull the preamp card and reinsert it in its slot. Sometimes the contacts in the card gets a 'set in' and by removing the card then reinserting it clears up this problem.

Do you have another preamp card to do a swap?

Posted by Travis Cape (Member # 466) on 08-21-2008, 11:02 PM:

Monte,

I'll try that tomorrow. I don't have another preamp card to check. What confused me more was that you can set dolby level. The processor acknowledges the projector is there for that function...

Posted by Steve Guttag (Member # 268) on 08-21-2008, 11:13 PM:

Since it is a CP500 with dsub inputs...have you tried swapping the inputs so P2 feeds P1's preamp and vice-versa. This would quickly locate the source of the problem (soundhead reader or Dolby issue).

Steve

Posted by Travis Cape (Member # 466) on 08-21-2008, 11:28 PM:

Steve, I thought that since the reader works for setting dolby level that meant the issue was with the processor, I just don't know where. I'm having trouble with the fact that you can set dolby level with a machine, but not run a film in analog. What's the difference? Aren't they both running film through the same sound head?

Posted by Marin Zorica (Member # 1716) on 08-22-2008, 01:21 AM:

You said you can set dolby level on that PRO2?? Does level light on 222SR/A are burning or?? Probably something with audio chain from preamp to A/D conv. Because if you can set level, than preamp is working.

Posted by Brad Miller (Member # 2) on 08-22-2008, 01:47 AM:

Its a CP500. Reboot it. There's better than a 90% chance it will be fine after rebooting it.

Posted by Louis Bornwasser (Member # 3063) on 08-22-2008, 12:11 PM:

Swap (temporarily) the Kelmar power supplies. I think you will find the PRE PREAMP power is intermittent. Louis

Posted by Travis Cape (Member # 466) on 08-22-2008, 07:58 PM:

I found my problem. I must have not reset dolby level on that projector last month when I had swapped LED power supplies. I set level today and all is well.

Louis, you yourself know all I've done with that theatre in the past month.

Thanks guys