Did the repair this morning, and it was less tortuous than I'd feared.
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Using a 17mm deep socket on the outer nut and a pair of needle nose pliers to hold the inner, I was able to remove the cathode connection pin from the SPG.
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With the cathode pin out of the way, I was able to rotate the SPG around 70 to 80° counter-clockwise:
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That gave me the wriggle room needed to push the lamphouse module in just far enough to get my fingers behind the bulkhead and release the four catches on the UV blocker's frame.
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With that done, I was able to lift the UV blocker frame, and pull the plastic anode insulator out of the lamphouse module. Again, it was hair-raisingly tight (if the anode flylead had been a quarter inch shorter, this would not have been possible, though in that scenario I could have lifted the UV blocker high enough to get a big pair of dikes in and cut the flylead), but I was just able to get wrenches in and separate the lamp from the seized anode pin, thereby enabling me to pull the SPG out of the projector with the seized anode connector attached to it:
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The NFG SPG out of the projector:
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The two surfaces were absolutely welded solid. Even a pry bar whacked with a hammer failed to produce even the slightest movement. Close-up of the fused connection:
image.png
The lucky break was that these were the only two welded surfaces. The cathode pin and its connections were all good, as was the adapter at the back of the lamp. I replaced the cathode pin and insulator as well, though, because a new set had been ordered, and there was no point in risking the same thing happening to that as well.
As the above photos make painfully obvious, the next order of business was a serious cleaning session in the lamphouse compartment, on both sides of the bulkhead.
After replacement of the SPG, cathode connection receptacle and insulator, and reassembly:
image.png
I brought the Dremel and hacksaw with me just in case, but thankfully did not need them. I was hoping to avoid spraying brass fragments all over the projector and booth.
Thanks for everyone's suggestions.
image.png
Using a 17mm deep socket on the outer nut and a pair of needle nose pliers to hold the inner, I was able to remove the cathode connection pin from the SPG.
image.png
With the cathode pin out of the way, I was able to rotate the SPG around 70 to 80° counter-clockwise:
image.png
That gave me the wriggle room needed to push the lamphouse module in just far enough to get my fingers behind the bulkhead and release the four catches on the UV blocker's frame.
image.png
With that done, I was able to lift the UV blocker frame, and pull the plastic anode insulator out of the lamphouse module. Again, it was hair-raisingly tight (if the anode flylead had been a quarter inch shorter, this would not have been possible, though in that scenario I could have lifted the UV blocker high enough to get a big pair of dikes in and cut the flylead), but I was just able to get wrenches in and separate the lamp from the seized anode pin, thereby enabling me to pull the SPG out of the projector with the seized anode connector attached to it:
image.png
The NFG SPG out of the projector:
image.png
The two surfaces were absolutely welded solid. Even a pry bar whacked with a hammer failed to produce even the slightest movement. Close-up of the fused connection:
image.png
The lucky break was that these were the only two welded surfaces. The cathode pin and its connections were all good, as was the adapter at the back of the lamp. I replaced the cathode pin and insulator as well, though, because a new set had been ordered, and there was no point in risking the same thing happening to that as well.
As the above photos make painfully obvious, the next order of business was a serious cleaning session in the lamphouse compartment, on both sides of the bulkhead.
After replacement of the SPG, cathode connection receptacle and insulator, and reassembly:
image.png
I brought the Dremel and hacksaw with me just in case, but thankfully did not need them. I was hoping to avoid spraying brass fragments all over the projector and booth.
Thanks for everyone's suggestions.
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