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Author Topic: ORC 1000 Console zener diode Phil Housh Film Handler Posts: 24 From: Boise, Idaho, USA Registered: May 2003 posted 05-07-2007 08:35 PM                     Does anyone know the value of the zener diode that is in the auto ignition circuit on an old ORC console? I have the circuit diagram, but can't find the value. I also looked here on Film-Tech, but can't read that one either. Thanks!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-07-2007 08:40 PM                     Try looking on the diode itself.... Probably a 1N#### or MZ#### somethong or other number...  |  IP: Logged Phil Housh Film Handler Posts: 24 From: Boise, Idaho, USA Registered: May 2003 posted 05-07-2007 08:47 PM                     Hi Mark, Can you believe it, I have three consoles, but the number is not clear enough to read on any of them even with a lens!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-08-2007 09:44 AM                     Send me one and I can test it on my Tektronix curve tracer for you and tell you what voltage it is.... Mark  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 05-08-2007 10:48 AM                     If you know the autostrike relay coil voltage and the open circuit rectifier voltage then you can pick a zener voltage that will work. If it's a 24V relay coil and your rectifier has 100V open circuit then a 75V zener should work fine, or a bit lower. If you have a working zener (out of 3 I hope so) it's easy to measure. Just get a 5K or so resistor and attach it in series with the (disconnected) zener across the rectifier output, use clipleads or something - NOT your hands, 100+ volts DC can kill you easily. +_____________|<____________~~~_____________- rect pos diode resistor rect neg ^ ^ measure voltage here The voltage across the diode will either be around 1 volt or 50-80 volts. If it's 1 volt, reverse the diode connection and measure again. Then just get a correct power rating zener - probably 5 watt -with a zener voltage specification close to the measured one.  |  IP: Logged

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