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Topic: Help!!!...Bulbs Keep Blowing Up
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frank arnstein
Jedi Master Film Handler
Posts: 534
From: Gold Coast. Australia
Registered: Jan 2005
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posted January 25, 2010 04:41 AM
Hi Jon & others on this thread.
Its an expensive fault to try and fix, as you have pointed out. Before trying a 3rd lamp, my suggestion would be to check the earth connections at the lamp socket. There is often a pigtail wire with slide on connectors that can get loose. There is sometimes a high resistance that develops in the lamp socket contacts or even the earthing circuit to the chassis. Rusty marks may indicate where it is. Sometimes the insides of the socket walls or the earthing pieces that are used to ground the lamp holder. There is a spring that preloads the lamp in the socket. Check that its all clean & tight when the lamp is in. The socket contact points should be scraped till they shine brightly, especially the lower, main, centre spring loaded contact. Wiggle the old lamp around in the socket to clean all the side contact points. Remove again & spray it all clean inside with an evaporative spray, electrical cleaner.
If you can get a voltmeter onto the socket contacts, check the voltage is 8 volt & steady while running. If it all looks OK, then try another lamp & see what happens. If it blows yet again, toss the whole projector off the nearest cliff & get another one.
Good Luck with it. Tell us what happens.
Dogtor Frankarnstein.
-------------------- At Projector Heaven the Focus is always on Detail.
____ [o:/o]<|=- dogtor@projectorheaven.com.au //``\\ -----------------------------------------------
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted February 27, 2010 07:02 PM
I started out with a Radio Shack multimeter in my teens: it was OK but eventually died. In order to get the quality of meter I was using at work would have cost several hundred, but I managed to get a nice Fluke 37 used on E-bay for about 35 bucks.
If you want to get away from the $14.99 cheapies and are willing to spend a little more, I'd go this way. One of these used is better than a cheap new one for the same money because they are built to withstand abuse and will last much longer. Besides, I've had one or two of these cheapies eat batteries as if they were free.
I like hand held, battery powered meters. Not having to plug them in makes them more versatile, especially if you use them to work on cars or in other cases where outlets are scarce. They aren't as accurate as the typical bench meter, but that extra digit or two of accuracy means nothing for hobby/home use.
Names I like are for these are Fluke and Keithley.
Just like buying a projector, "Sold as is" is probably your signal to turn and run! With something like this, if you buy it working it will probably work for years, but since there are tons of ways for them to die, you want that assurance it is working before you take delivery.
-------------------- All I ask is a wide screen and a projector to light her by...
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Jon Addams
Jedi Master Film Handler
Posts: 638
From: New York, NY, USA
Registered: Apr 2007
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posted February 28, 2010 12:42 PM
Thank you very much for the suggestions Steve. I will look in that direction.
Winbert, it’s not a matter of this projector being special, I own quite a few projectors (I do have 2 Chinon 330MV) and it’s not the price of the bulb. Right now I have a couple of dozen projectors in my junk pile with, what may be, minor problems, a little hum here, sound that you can hear with headphones but doesn’t reach the speaker, no sound, etc.
I have been reading some basic electronics books and I want to start tinkering with these things, after all the projectors in question are not currently usable.
I have sent a few units to Leon Norris (ST-1200s) but that too has become too expensive and they not always work when I’ve gotten them back. I have bought several repair manuals and I believe if I can track the problem I can fix it myself or at least try before tossing them away. It will be well worth it in knowledge and will make my involvement in this hobby a lot more enjoyable.
For my personal viewing, I have an Elmo ST-1200HD with a 1.0 lens and a Sankyo Stereo-800.
Jon
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