haireez
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Post by haireez on May 6, 2016 6:30:37 GMT -5
Hi, Just to confirm on 2 types of VNB that I just received from curt. Presumably for lug tubes as I was told by Curt. However, I'm surprise that 2 of them are identical (P/N: 2-270340-01B) while the 3rd VNB (P/N: 81771-02H). Can anyone advise why one of the VNB different? The 3rd VNB has 2 G2 pin that I've never seen before. Appreciate if anyone know exactly which is the correct lug tube VNB.   |
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Post by gjaky on May 7, 2016 10:19:18 GMT -5
Well, if you see hanging G2 wire, you can be sure that it is not for LUG tube, but it can be converted. What is worse, I don't think these two type of neckboards can be mixed in one projector, there is a difference in the spot kill circuit.
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haireez
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Posts: 68
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Post by haireez on May 8, 2016 1:20:11 GMT -5
That's why I'm surprise seeing this VNB from Curt and hopefully someone from this forum could advise whether they are really for Lug tube and safe to use.
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Post by gjaky on May 8, 2016 1:26:01 GMT -5
Near the tube socket there are small jumpers where you can make interconnections, called A and B. Actually these are determining wether the board is for LUG or LCP, it is easy to convert to LUG even if it is not for LUG right now. Can you tell the setting of those jumpers on the boards?
But as I said before I'm more concerned about the different spotkill circuit on the boards...
As I see it one board came from a 8520 that had 8" DMB tube (G2 on pin2), and the other two came off from a LUG indeed.
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haireez
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Posts: 68
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Post by haireez on May 8, 2016 5:31:16 GMT -5
Hi, I'm not too sure where is the jumper that you're referring to. If you're referring to R64, then both setting are exactly at the same direction but if it is not, do let me know where and I will check again.   |
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haireez
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Posts: 68
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Post by haireez on May 8, 2016 5:41:26 GMT -5
I think I found which one you're referring to. On the otherside, the first one is set to 'B' and the other one is set to 'A'. What does it means?   |
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Post by gjaky on May 8, 2016 5:59:26 GMT -5
When the jumper set to A it is the LUG mode, therefore the G2 is connected to pin6 on the tube, no need for G2 wire. While in B mode pin 6 is connected to ground through a 330k resistor (as normally with Marquees) for LCP tubes, an d of course the G2 wire is needed then for pin 2.
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haireez
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Posts: 68
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Post by haireez on May 8, 2016 8:06:46 GMT -5
Thanks for the clarifications. Does it mean that if I were to change all to 'A' setting, I can immediately use lug tube or if I were to change all to 'B'setting, I can use them for LCP tubes without the need to further modified anything vice versa?
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Post by gjaky on May 8, 2016 8:20:57 GMT -5
Thanks for the clarifications. Does it mean that if I were to change all to 'A' setting, I can immediately use lug tube or if I were to change all to 'B'setting, I can use them for LCP tubes without the need to further modified anything vice versa? Almost, setting every board to A and use with LUG is simple and easy, returning to LCP needs to set the jumpers to B AND install a G2 wire on all three neckboards, but no other modification would be needed. |
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Post by barclay66 on May 10, 2016 3:01:23 GMT -5
Hi,
Just to make things perfectly clear: There are two independent issues involved.
Issue A: Setting of the jumper and installation of the G2 connector wire. This is explained in gjaky's post above (Jumper on A and G2 Wire removed -> LUG; Jumper on B and G2 Wire installed -> LCP). You can easily do that by yourself.
Issue B: The 3rd VNB (P/N: 81771-02H) doesn't work with VNBs of a different type. You need to replace this one with a regular VNB (P/N: 260339-01P) or another new type one (P/N: 2-270340-01B).
Regards,
barclay66
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haireez
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Posts: 68
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Post by haireez on May 11, 2016 8:43:57 GMT -5
Hi All,
Before I start to install them on my Vision 1, I need to be absolutely sure before I damaged any tube. My current set-up right now is that my red & blue tubes are LCP and I believe I can use the 2 VNB (P/N: 2-270340-01B) that has the jumper setting to 'B' and connect the G2 wire as per LCP configuration.
My green tube right now is P43 fast phospher tube (more for 3D movie with HD Fury4) and the configuration is the same as lug. Does this mean that I can use the VNB with jumper setting at 'A'.
I'm just concern when Barclay mentioned that P/N:81771-02 doesn't work with different type. If this cannot be mixed, can I used my old style VNB that has been modified for P43 tube & used P/N: 2-270340-01B for red & blue tube?
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Post by gjaky on May 11, 2016 11:30:58 GMT -5
Yes.
However I would not advise to mix the new and old neckboards even if it is technically allowed, because they are two different designs, and as such they will surely will behave differently both in drive and in bandwidth.
I don't know if do you have skills to solder delicate parts (or you know someone who can do such job), but as I see a better way would be to transform the 81771-02H board to 2-270340-01B.
Schematic diagrams are available for both boards and only three parts needs to be replaced (they cost nothing).
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Post by barclay66 on May 12, 2016 4:20:15 GMT -5
However I would not advise to mix the new and old neckboards even if it is technically allowed, because they are two different designs, and as such they will surely will behave differently both in drive and in bandwidth. I don't know if do you have skills to solder delicate parts (or you know someone who can do such job), but as I see a better way would be to transform the 81771-02H board to 2-270340-01B. Schematic diagrams are available for both boards and only three parts needs to be replaced (they cost nothing). Hi, It's a bit more than that. In total there are six parts to be replaced and the trimmer (R64) needs to be readjusted (does any one know how to set it correctly?). I have some 81771-01 boards which have been factory converted to 02-270340-01 by VDC. There's at least one additional resistor that they mounted on the solder side. I can look up what exactly has been done, but I wouldn't recommend doing it to anyone not having enough experience in replacing SMD parts...
Regards,
barclay66
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Post by gjaky on May 12, 2016 12:03:55 GMT -5
I saw the difference in the current limiter circuit, but since both boards work with the same tubes I don't think that modification is a "must" to operate both types together, but I could be wrong of course.
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haireez
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Posts: 68
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Post by haireez on May 14, 2016 2:38:54 GMT -5
For my current Vision 1 setup, can I install VNB P/N:81771-02 on my green P43 fast phosper tube and use VNB P/N: 2-270340-01B on the red and blue LCP tubes?
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