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Barry
Joined: 01 Feb 2007
Posts: 186
Location: Los Gatos , Ca.
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| Posted: Sat Jan 12, 2008 9:47 pm Post subject: Barco 120X HV Quadrupler rebuild question |
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I recently replaced teh HV uadrupler in my 1209 and it was not cheap (just reasonable...thanks Curt). According to the scematic it consists of a few HV diodes and HV caps as well as a coil. It seems to me that if I could unpot it I might be able to replace one of the defective components and have a spare. Has anyone ever tried this?
Barry
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Addicted to buying cool used expensive toys...(especially CRT projectors) Barco 1209, 1208 and Elektra Espresso Maxi2 most recent additions.....
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Jan 13, 2008 12:48 am Post subject: |
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They can be repaired with the tricky part replacing the potting compound. The replaced material has to be compatable with the old stuff. It has to bond, have similar insulation properties, and expand/contract with temperature changes like the original material. Then, it has to spend some time in a vacuum chamber to cure so there are no bubbles or voids. 35KV is mean stuff and it wants OUT! You don't want any leaks.
Scott
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"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Barry
Joined: 01 Feb 2007
Posts: 186
Location: Los Gatos , Ca.
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| Posted: Sun Jan 13, 2008 6:59 pm Post subject: |
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I wonder if the potting material is so integral to the compnonents that it would be impractical to remove it and expect to not destroy the parts inside. Have you tried it?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Jan 13, 2008 7:38 pm Post subject: |
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Some of the potting material is like silicon and easily breaks off in chunks. Other stuff is hard epoxy like material. I've never messed with that style. Hot air from a desoldering station might break it down but I'm speculating. Dremel tool? That would work but might be alot of work. Nothing says you can't experiment. One thing though, when something like a multiplier/flyback transformer starts arcing, things tend to get blown up.
Scott
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"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Jan 13, 2008 7:49 pm Post subject: |
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I've got a local guy that's done 4 Barcos for me. Two worked fine, two appeared to have 'leaky' silicone goop, (you could draw arcs off the back of the damn things with a grounded screwdriver!) so while I think he repaired the shorted diode/whatever in the block itself, the leakage put the thing into shutdown mode.
I don't know his secrets, and frankly I'm not asking, as he works on HV supplies all the time apparently. I am about to send 3 Marquee supplies to him along with 4 more quads, including one of the two bad ones from last time. I'll see if he can ramp up to speed, as he took about 4 months to repair the last ones (I told him there was no rush, as it was an experiment).
So don't throw out your Barco quads. I'll take them all!
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Barry
Joined: 01 Feb 2007
Posts: 186
Location: Los Gatos , Ca.
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| Posted: Sun Jan 13, 2008 7:53 pm Post subject: |
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Curt,
You might just offer it as a repair QUADs service. You test em place an adder and resell.
BTW, the new (used) one fired up fine.
Barry
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Jan 13, 2008 8:05 pm Post subject: |
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I will do just that once I get turnaround and pricing worked out.
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Barry
Joined: 01 Feb 2007
Posts: 186
Location: Los Gatos , Ca.
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| Posted: Sun Jan 13, 2008 8:09 pm Post subject: |
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I assume that the grounded screw driver test will be standard.....I have visions of my grounded finger there....
When I was in HS and converted my 17" B&W TV to an oscilliscope there were some bared yoke wires and while adjusting something, my hand found it and I will never forget that lesson! The HV may not have the current punch but it sure owuld bring back bad memories!
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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Barry
Joined: 01 Feb 2007
Posts: 186
Location: Los Gatos , Ca.
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| Posted: Sun Jan 13, 2008 8:53 pm Post subject: |
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Tom,
I assume that the girl in your avatar is not holding one of your "repaired" QUADs for that shot.
Barry
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