Author
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Topic: Lamp troubles
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Mike Peckham
Phenomenal Film Handler
Posts: 1461
From: West Sussex, UK.
Registered: Jun 2003
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posted November 30, 2003 05:40 AM
Hello Gang!
Thought I would share this with you; I was watching a film last night and the screen went dark, sound continued as did the projector so I automatically thought 'blown lamp'. I had a spare so popped that in and still nothing.
Could it be a lamp that was faulty from new or problem with the projector? Thinking the latter I took the back of the projector [Sankyo 702] to check for fuses, only found one and that was ok, traced the wire and all seemed to be in order, lamp holder not cracked or burned, hmmm... Found another spare projector lamp that I had taken out of a machine that I had bought sometime ago, I had replaced it because the reflector was shot but kept it because it still worked, popped that in and the lamp came on, hmmmm.... So this morning I went to Jessops and bought a brand new bulb 'off the shelf', popped it in and nothing . I jiggled the lamp holder around, tapped things and closely examined the filament, nothing.
So. I took the lamp out, shined up the pins with a bit of fine sand paper and then put a dab of vaseline on each one. Popped it in and hey presto we had light .
So. The moral of the story is; give your pins a little buff up every now and then
Mike
Part two.
Have just been watching a film in order to try out the newly installed lamp and unfortunately the image began to become darker and eventually disappeared. Close inspection of the bulb has revealed that the actual bulb bit where in lies the filament has completely blackened, the filament itself is still in tact as it was still possible to make out a dim glow whilst the projector was in warm up mode.
So. What now? Is it an electrical fault? Is the lamp receiving to high a voltage? If anyone has any ideas I would be pleased to hear them.
Mike [ November 30, 2003, 08:16 AM: Message edited by: Mike Peckham ]
-------------------- Auntie Em must have stopped wondering where I am by now...
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James N. Savage 3
Phenomenal Film Handler
Posts: 1375
From: Washington, DC
Registered: Jul 2003
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posted December 25, 2003 02:18 PM
Mike- I have been using Sankyo's for the past two decades, and this is what I have found: I had been using the G.E. Multimirror lamp, and every now and then, I would have to adjust the pins in the socket to get a proper connection. I later heard about the Osram bulb, which was supposed to give an even brighter image. I installed one, and the picture did appear to be brighter, but after about two feature films, it started going dark and in a matter of minutes, it completely burned out. I ordered another one and the same thing happened again. I have since returned to the G.E. and don't have any problems now. I almost always run films on the brighter setting, as it gives a more impressive image.
I think the Sankyo's are sensitive to certain brands of bulbs, but as I said, the G.E.'s work fine for mine (ST-800). Nick.
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