How to upgrade JVC DLA X3/X500/X5000 with the missing second iris - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 15 Old 04-30-2019, 06:50 AM - Thread Starter
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Adding the missing second iris to JVC DLA X3/X500/X5000

Hi,

JVC traditionally excludes the second iris from the entry-level projectors. X3, X500 and X5000 are missing them, where X7, X700 and X7000 do have them. The second iris dramatically improves the contrast of these devices (up to twice the value) and is mostly the largest difference between the small and next-larger models. When looking at the price-tags this is somewhat disturbing.

I once came across the picture of the second iris and opened up my X3 to see, if I can fit this thing in there by myself an found it to be a rather easy task. I then did this with my new projector, X500 and had no problems with it as well. I equipped a friends RS40 with it and just now wrote a small guide for another friend that lives kind of too far away to help him out by myself. The instructions are in German, but if there is enough interest, I could translate it to English. Anyway, the pictures show most of the process.

Original German version:
https://docs.google.com/document/d/1...it?usp=sharing

English version:
https://docs.google.com/document/d/1...it?usp=sharing

Have fun!

---

Changed the title, because it looked like a question.
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Last edited by ((( atom ))); 05-01-2019 at 05:45 AM.
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post #2 of 15 Old 04-30-2019, 01:53 PM
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Thanks! Yes please for English version

Also will this work on x35?


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post #3 of 15 Old 04-30-2019, 02:13 PM
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Nice write up...

I'm not sure it would be worth all this trouble and risk to double the contrast, tripling it might be another story.
Doubling the contrast isn't as dramatic in viewing as it sounds.

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post #4 of 15 Old 05-01-2019, 05:05 AM - Thread Starter
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It is. I cannot even tell you the exact numbers, because I never bothered to measure it before, but I turned my X3 on after the mod and it made a major difference, visually. I have a retroflective screen (old DaLite) and especially my black levels were annoying before, there was just no proper black. That got satisfying tor the first time since I had this projector. When I got the X500 I didn't even set it up before inserting the second iris. Took me maybe 20 minutes.

For the risk: If you never opened up any device you should definitely not start with that one, but if you are a little experienced with this sort of thing there isn't much that can go wrong actually, since you only remove lids and covers.

X35 comes without the second iris.
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post #5 of 15 Old 05-01-2019, 05:46 AM - Thread Starter
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Translated the guide to english and took out the "double the contrast" figure, since it is not based on a measurement and might be wrong. English guide linked in the original post.
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post #6 of 15 Old 05-01-2019, 06:34 AM
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Thanks. I’m too scared to try on my x35 at the moment


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post #7 of 15 Old 05-01-2019, 02:41 PM
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Quote:
Originally Posted by ((( atom ))) View Post
Translated the guide to english and took out the "double the contrast" figure, since it is not based on a measurement and might be wrong. English guide linked in the original post.
Thanks, sounds like it might be worth a try then, you've maybe convinced me

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post #8 of 15 Old 05-01-2019, 02:44 PM
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Quote:
Originally Posted by coderguy View Post
Thanks, sounds like it might be worth a try then, you've maybe convinced me


Which projector do you have ?


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post #9 of 15 Old 05-01-2019, 02:46 PM
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Same as you - X30 (RS-45), I just had to order a new bulb though, hoping I don't have a ballast issue.
Never had a ballast issue, but I just get worried every time a bulb fails

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post #10 of 15 Old 05-01-2019, 03:53 PM
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Quote:
Originally Posted by coderguy View Post
Same as you - X35 (RS-45), I just had to order a new bulb though, hoping I don't have a ballast issue.

Never had a ballast issue, but I just get worried every time a bulb fails


Oh ok

Do you mean RS-46? I think x35 is a rs46 and x30 is a rs45

I may be wrong though....

Good luck!


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post #11 of 15 Old 05-01-2019, 03:55 PM
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Quote:
Originally Posted by k3nnis View Post
Oh ok

Do you mean RS-46? I think x35 is a rs46 and x30 is a rs45

I may be wrong though....

Good luck!


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You are correct, sorry I mean the x30 (typed two 5's instead of one).

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post #12 of 15 Old 05-01-2019, 03:56 PM
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Quote:
Originally Posted by coderguy View Post
You are correct, sorry I mean the x30 (typed two 5's instead of one).


If you do try it let us know how you go


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post #13 of 15 Old 06-06-2019, 08:09 PM
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I just replaced the ballast on my X500, had I known about this, I would've given it a try at the same time! Might still do it anyway though

Thanks for the guide atom!


Just one observation: if you are getting 20% brigthness reduction by fabricating and installing the second iris, does that mean that the higher end JVC's that already have this second iris factory built-in also have a brighter bulb? From memory the lumens output between the lower and higher-end JVC's is similar. So given this, you would expect the higher end JVC's to have increased lamp output given the presence of the second iris... or am I seeing this wrong?
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post #14 of 15 Old 06-12-2019, 09:46 PM
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Look CAREFULLY within the younger lines (X3,30,35) and compare with the models X7,9,70,90,75,95.
With a careful comparison, you can easily find a second fan in older projectors. Which brings cooling air just to the part where the second diaphragm is located. This is done in order to eliminate overheating.
In addition, the second diaphragm must be adjustable. Homemade naturally can not.

Hence further problems arise.
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post #15 of 15 Old 06-12-2019, 10:00 PM
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If you make a second diaphragm for younger projectors, then you need to purchase a second fan, remove two plugs that are located: 1 at the air inlet where the filter is located, 2 at the optical path itself.
But the problem with brightness when the lamp is worn will remain. Because a homemade diaphragm is not adjustable.
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