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Discussion Starter · #1 ·
I have a NEC 9pg xtra that will not allow me to adjust brightness. Everytime I go into the menu to adjust brightness, the red and blue crt's are greatly reduced and the green overpowers. After this occurs, I have to go back out of the settings and back into the brightness menu and then "normal" the brightness to bring the red and blue crt's back into play. This also happens whenever I check the Kelvin, white balance, or AKB settings. I have returned the PJ to factory settings, but with the same returning problem.


I have a Dishnetwork 811 receiver into a transcoder and into the projector which seems to run really dark. Without being able to turn up the brightness, the picture is too dark for viewing in most scenes. A DVD player going into the same transcoder to the PJ produces a picture that is quite bright compared to satellite.


Any assistance would be greatly appreciated.


Martin
 

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You need your reference mechanical white balance done by a qualified tech. What you're seeing is the AKB trying to work when someone's messed with the G2 pots. Good luck with it.

(At least thats my guess based on my experience, I'm NOT a tech, just had a few NEC's along the way.)
 

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Discussion Starter · #3 ·
Living out here in Nebraska there aren't a lot of techs (unless it's a problem with the Cornhuskers)!


Is there anyone in the neighborhood or other resources I could try?


Martin
 

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My guess is the same as Paul's - G2 and white balance needs adjustment, but I'm no tech either.
 

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About 8 hours, 12 cups of coffee and a good oscilloscope......


You will need an NEC tech for this one.


Marc
 

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BTW, there are NO G2 pots on the Xtra in the traditional sense. Everything is done using the white balance controls on the back video board. Unfortunately, the adjustments are complicated, require a scope among other things, and should NOT be attempted by a novice, even WITH the service manual.


I think your best bet here is to have a real tech (such as Doug) look at it.


Marc
 

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This forum needs to identify the location of ALL tech's who are qualified, willing, and CAPABLE of doing this setup for NEC's. We can't all afford to ship our projectors to Doug in CA. How can we locate these tech's ? There must be some somewhere ? We need about six in total to cover NA and then a couple in Australia and a few in Europe(although there seems to be fewer NEC's in Europe for some reason).
 

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Discussion Starter · #11 ·
Sounds like something that I don't want to mess with. Any techs out there in need of a trip to Nebraska?


Or would I be better off looking for another PJ?


Martin
 

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If you have NO choice whatsoever, you can fudge it enough to use the projector, maybe even get a decent image. Try every option besides fudging it first though, then get a service manual and give it a go yourself. Its better than trashing it altogether.
 

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Quote:
Originally posted by gn2
This forum needs to identify the location of ALL tech's who are qualified, willing, and CAPABLE of doing this setup for NEC's. We can't all afford to ship our projectors to Doug in CA. How can we locate these tech's ? There must be some somewhere ? We need about six in total to cover NA and then a couple in Australia and a few in Europe(although there seems to be fewer NEC's in Europe for some reason).
Great..... now we all have to run around with a GPS locator so the forum members can find us. :D


Who wants to be first?


Oh, you said WILLING..... that leaves ME out! WHEW!


Marc
 

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Martin,

Open the lid and look for the test normal switch at the very right end of the video out board (the one with the pots) set this to normal and the brightness should work. Test is to the left and normal is to the right standing at the rear looking forward if floor mounted.


If its in the test mode it wont, check AKB from the info screen ( hit the info button) and shut akb off. Doug
 

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Hey Doug. You don't suppose......


I didn't want to go there, actually. Though the test switch should not make ONE gun go crazy like this.


Martin,


Doug is correct, of course. But be careful, will ya? It's a TINY white switch.

Try it and let us know what happens. It nonetheless sounds like someone screwed with the pots, and that's a bad thing.


Marc
 

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Marc,

Yes your right, I missed the first post with the explaination.


Martin,

You might try to select the signal you are running, turn AKB on then store, shut back off and store.


Sounds like its the reference white balance.


Write the settings down you have now then go to kelvin, lower the bottom value (B) until its corrected.


If that doesnt work try the top (W) value.


If the kelvin hasnt been stored it could do this for that input or if your running sync on green without knowing.


The info screen will tell you sync configuration.


Kind of hard not seeing it to give a good evaluation but some things to check.


If the test position gives you a good balance then its in the RGB kelvin settings or source. Doug
 

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Discussion Starter · #20 ·
Thanks for the help. Here are the current settings:

Sync detect: auto separate

freq: h-45 khz, v-60hz

sync: h(-), v(-)

color temp: 6500K

AKB: off


Does this shed any light?


I will try some of the recommendations tomorrow, Doug.


Thanks,


Martin
 
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