Hi there,

Ok so I have read some posts about what I believe I'm having problems with on this NEC PG-6100.

I believe this projector is suffering from an intermittent problem of "Dreaded Scrambled Mess"
Apparantly this is due to an system board on the way out?

I have an NEC PG6 setup at my girlfriends apartment which I'm having some problems with.
It's an fairly high hour unit as far as NEC PG goes I think with just under 8k hours on it. I believe it originated from Curt Palme.


Problem #1.
Sometimes when I start the projector up and try to get it to lock to an resolution from my laptop I just get a black picture with the menu rolling sideways completely distorted as if it is out of sync.
If I then go to test and then press end I get it to sync to the resolution and bring up a picture.

However if I then bring up any kind of text from the on screen menu it is still distorted and rolling horizontally making setup a real PITA to do.

The strange thing is that sometimes it doesn't do this at all no matter what resolution I try on it.
I can usually get it so sync to 1024x768@60Hz and get the on screen menu to look right but as soon as I change refresh rate or resolution to anything else I can't read the on screen menu anymore. It may have something to do with 1024x768 being an positive sync resolution.

I am using a VERY heavy duty step down transformer to convert 220V to 110V.
The brand is AED and the model is VC-1000. I found it on AED's website here.
1000 Watt seems a tad over sized.
Could it be this step down transformer that is making a fuss creating this scrambled mess problem?

Here's a pic of the step down transformer I have.
http://www.aedinternational.com/vcon/2st1000.jpg]


Problem #2.
Also I have aligned the projector mechanically as well as I can get it in the room and the projector is perpendicular to screen but no matter what I do sometimes I can't get the lower left part to converge. The red and blue corner droops from the green.

I don't have an point convergence board installed in it though and I guess that would help?


Problem #3.
If I center the blue raster on the tube the adjustment is all the way to bottom.
I guess there may be some mechanical raster shift inside the projector which I don't know of?


Problem #4.
I also have problems changing memory block on it.
I usually need to go to signal entry and make a new entry and copy the entry I want to switch to to the new entry for it to change memory block.


Question.
Would it be worthwhile to upgrade this unit from an NEC 6PG to an NEC 9PG?


I'm really an Barco and Electrohome guy myself but this NEC 6PG was perfect for my girlfriend's apartment since she can fit it under her coffee table which she thought was kinda neat. =)

I'm thinking of replacing it with an Barco 708LC instead but the downside to doing that is I lose the EMF focus which the NEC offers.

Any thoughts and suggestions would be greatly appreciated since NEC is kinda foreign territory to me.

I'm really an Barco and Electrohome guy myself but this NEC 6PG was perfect for my girlfriend's apartment since she can fit it under her coffee table which she thought was kinda neat. =)



Well if nothing else, she is a keeper! I need to find myself a woman that thinks projectors are 'neat'. At least she didn't think it's 'cute'. Projectors are never 'cute'. Digitals are 'cute'. UNtil they break. Then they are no longer 'cute'.

you either have a bad system board or a bad deflection board. I've got good working spares if you want one, I have yet to find a cure for a bad system board.

Heh, yeah she has been quite understanding and supportive when it comes to my CRT-fetish.
I had an 909 in our living room on a table in front of our couch blowing hot air in our face during the whole summer of '06 when we lived together in a house. =)
She doesn't mind any projector if I ceiling mount it for her though.
She's a movie buff herself also though so she just likes the big picture it produces.

Can you pm me a quote for both of them?
Could I use the 9PG parts in the meantime?

mrking,
This problem may have started from the power converter going bad. We saw one last month on a XG that did the same thing but it was to late to save the system board.

Check the output side of the converter earth to neutral voltage. I would use the right power supply or have the 220V mod done before putting parts into it. Doug

Hmm ok, the plus comes off really easy from the converter I know because my dog has pulled it out a couple of times...
so maybe a bad connection caused this?
How do I check earth to neutral on this thing?

Who does the 220V mod over at this side of the pond and how much is it?

When saying 6PG (6000) is this really a Plus (6100)? Different boards.

Use a voltmeter and check the female output plug connector center (round) earth ground to the biggest spade (neutral) be careful this can be high.

Wish I understood the converter's better. Here in the US we want to be under 1V.

Dont know who does them over there but its on the A board (AC side) of the power supply. Doug

This could very well be the transformator. i was having severe problems with the dreaded scrambled mess om my XG 1351LC, while using a transformator. When i measured, I had a ground-to-neutral voltage of 110V :eek:
These transformers seem not to reduce live from 220V to 110V, but to push neutral to 110V. Nec's dont like this, it seems.

I changed the PS to 220V. Since then it was much better! Not 100% reliable, but at least 90%!

Hi there,

Thanks alot to both of you for responding sp swiftly.

The projector seems to be an rebadged PG-6100 at least that's what it says on the back.
On the top cover it says GE Imager 414.

It is manufactured in november of 1994.

I don't have an voltmeter here right now and I'm driving home to Goteborg tomorrow which is 500km away so I am unable to do the measuring right now but I would agree that the transformer seems to be the likely culprit.

In the meantime I will try and order a power supply for the machine and while I'm at it I think I will change out the blue tube since it seems to have problems with the grayscale tracking.
Question is. Since this appears to be an NEC 6PG Plus? Should I put E85 tubes or P16LJE tubes in it?

Correct one problem before working on another or you will have a hard time checking your work. Then let it run out to be sure.

If you have E-XXX tubes replace with E-XXX tubes period. Doug

CJ,

a Imager 414 is actually a GP 3000 - clone. Did this PJ have a chassis - change at some point? I would guess it really is a PG 6100 if that is what's written at the back of the unit. Is the whole unit black? Imagers where black, while NECs usually come in this nice computer-grey ;)

Daniel.

Thanks for that friendly advice Doug i will do är you suggest. Ah ok.
No just the hood. The rest is gray.
Maybe curt remembers putting an 414 hood on a 6PG a while back?
I'm positive it's not an gp3000.

Noticed something strange yesterday. It appears the dreaded scrambled mess on this nec could also be source related?
Because from my laptop with an nvidia 7600 0the menu is scrambled but when i hooked my girlfriend's OLD pc with a lousy integrated intel graphics card in it only capable of 24 bit colors i can run 1280x1024 without the menu being scrambled? Isn't that weird?

BTW, if the set did come from me, or even if not, it's possible that I changed lids if the original one was badly scratched. there's a sticker on the metal chassis alongside the blue tube. Go by that sticker as to the model number. I don't remember putting a 414 cover on a PG set, but it's possible.

this is a PG Plus:
http://img17.imageshack.us/img17/9638/necpg61000517vs.th.jpg (http://img17.imageshack.us/my.php?image=necpg61000517vs.jpg)

and that's a GP-3000:
http://img510.imageshack.us/img510/9748/p1030170dh6.th.jpg (http://img510.imageshack.us/my.php?image=p1030170dh6.jpg)