[SML] Mac700 wackiness

[tech dept]

I've seen on other Mac fixtures, where the 'lamp-on' photo sensor, its orientation, or the associated connections have failed. 
My thinking on this is:
turn on lamp 
phase correction inductor held off
arc fail protection (ready)
hold off lamp/arc fail protection
initiate ignition
ignition
continue to hold off protection while arc stabilizes
monitor current
once current and arc are happy
turn on phase correction inductor (across mains)
activate arc fail protection circuit (including sensor)
Use fixture

so now if the sensor has failed  or connections are bad (photo sensor lead breakage, cold solder, oxidation on connector, broken wire in harness, sensor pointed away from arc, et al....) the fixture will protect then restrike or just fail)

good luck



> -----Original Message-----
> From: stagecraft at theatrical.net
> Sent: Fri, 30 Oct 2015 10:51:19 -0400
> To: stagecraft at theatrical.net
> Subject: [SML] Mac700 wackiness
> 
> We have a Mac700 that is behaving strangely.
> 
> It starts up and goes through self test as normal, but when given a
> lamp strike order, it fires the lamp strike, which we begin to see
> warming, then suddenly it goes out, and the fixture then goes into
> restart - kills the lamp, and goes back through the self test.
> 
> Electrician tells me there's no error message on the machine when we
> look, and its controllable after the reset, just no lamp.
> 
> Is likely just due to a bad lamp, or does the conciousness think its
> something larger - this is a rental unit, so we'd have to get them
> involved if its beyond a lamp.
> 
> Thanks,
> 
> RG
> --
> Rob Graham
> photonguide at gmail.com
> 
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