CurtPalme.com Home Theater Forum

huggy · Posted: Thu Oct 02, 2008 7:56 pm Post subject: Calling Barco Guru's

Anyone have a fix for the stuck sheimpflug adjusters on a 1209s,I've got them going in only one direction,with only one side of one tube going both ways.There's not much room in there to do any thing,so I'm wondering if anyone has an easy fix for this without pulling tubes out.

Regards

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

Did you loosen the small 5mm nuts on the front first, just like the orange sticker on top says? Only a couple of turns is enough! They lock the mechanism after adjusting. Sometimes you have to push the small screws in just a little bit, then they will unlock the mechanism. Both nuts are on the end of a U shaped rod that wraps halfway around the axis on which the scheimpflug excenter rotates.

The U-shape has to come just a little bit loose from the axis to allow for any adjustment at all.

Happy scheimpflugging!

huggy · Posted: Fri Oct 03, 2008 5:12 am Post subject:

Yes I am aware of the little bolts and they have been undone quite a bit,like I said I can feel sheimpflug moving in one direction but not the other,I've managed to get one tube to rotate in both directions but not the rest,has anyone had this problem and is there a fix without pulling the tubes out?

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Are all four rear springs in place ? I have several 1209s CRT housings here and there is just a thick aluminum cam with two machined slots in the housing for stops. I cannot see anyway it would move in just one direction unless the two upper springs were missing.

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

Let me explain a little more with a picture. Sometimes the screws are loose, but the thread on the U still grips the 'axle'. This can also result in movement in one direction only, locking in the other direction.

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

Another image.

zGman · Joined: 22 May 2006 Posts: 599

Hi,

Mr. r.bauer is giving you very good advice, this is exactly how they work, and it
can be quite frustrating to work with in the dark trying to push the one micronut
with one hand and adjust with the other.....

Excess torque on the 8mm hex adjustment can separate the metal hub
from the plastic cam. Which won't be much fun to repair.

G

huggy · Posted: Fri Oct 03, 2008 8:40 pm Post subject:

Thanks for the replies/photos,I know excatly haow the clamps/springs work and can assure you that I have loosened them to such a degree that I can actually see the spring move off the plastic housing.Trust me THEY ARE LOOSE!
I think what has happened is what ZGMan has suggested,the 8mm hex cam has seperated from the plastic housing.Beleive me when I say this,THis is not my doing,as this has how it has been since day one.I am going to glue the hex bolt to the plastic from where you adjust the actual 8mm hex bolt,this is the only way I can think of fixing this without taking the tubes out.
Any other suggestions would be bloody well appreciated. Thumbs Up

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

I have seen once that the brass 8mm brass hex was not fully inserted in the plastic, and when I turned it, it just fell right out. Just push it in a little deeper into the plastic, and it will stay there. i hav enever had to use glue on any.

Movement in one direction only, and not beeing caused by the U-shaped threaded rod locking the mechanism is a new one for me.

Well, as the BG1209s is a very fine chassis when it comes to swapping tubes, just take it out, and have a look at the tube assembly. A tube can be taken out in (less then) five minutes, even when it hangs from the ceiling. Just remove the neckboard and lens, loosen all connectors to the yokes and H/V, loosen the four bolts, and swing out the tube gently and you're done.
Thumbs Up

This is one very service friendly-chassis Thumbs Up

tommo2 · Joined: 03 Jun 2006 Posts: 226 Location: Ireland

Try hitting it with an american screwdriver (thats a hammer to you and me). This is what Chip (stefuel) would recommend anyway Laughing

Surprised he hasn't suggested it already. Wink

huggy · Posted: Sun Oct 05, 2008 1:54 am Post subject:

I've managed to move the cams with a screwdriver and alot of patients and time,I've achieved good sheimpflug (not excellent) on all three tubes,and at this stage really cant be bothered taking it anyfurther.I will however fix the lot up when I'm due for a tube change when I can score a cheap green and blue p19lug.

Thanks for all the help guys,much appreciated Thumbs Up

huggy · Posted: Sat Oct 11, 2008 4:02 am Post subject:

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

two small clamps on the front hold the tube in place. You can use a very small screwdriver to release it from the clamp.

Btw, I use an 8mm T-bar grip to adjust the scheimpflug. I actually use two, to do simultaneous adjustments.

It gives you very precise control over the scheimpflug adjustment.

huggy · Posted: Sat Oct 11, 2008 12:23 pm Post subject:

Mr Bauer,thanks Thumbs Up

I've removed the red pulled out the cams,seperated the hex bolt,filled it with araldite glue,replaced the tube,all in under 1 hour.Now my red sheimpflug works a treat Very Happy

Tomorrow I'll do the green and Blue Mr. Green

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

Good to hear you have that scheimpflug working like it should.

If you really want to go have a 'fun couple of hours', use a piece of paper to see if you have the scheimpflug in the corners dialed in right. Move the piece of paper next to the corners of the screen away and closer to the projector, to see if you have it dialed in just right.

This can be done with a full white, using the fosfor grain to observe the focus, or using one of the focus patterns from Nokia and observing focus the usual way.

huggy · Posted: Sun Oct 12, 2008 7:22 am Post subject:

R.Bauer or anyone Mr. Green

I seem to need a cable to run from my remote to the pj,looks like ordinary headphone jacks.Am I right or is it something special I need to get?

Thanks Y'all

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

You are right.

huggy · Posted: Sun Oct 12, 2008 8:30 am Post subject:

O.k now I have a problem.I've reinstalled all three tubes and have fixed all cams so they all work now however,I have a problem with the blue convergence Sad

It responds to every convergence input except horizontally i.e I can't get it to move from left to right ,vertically its fine.I've disconnected all leads and replugged them but to no avail,what Have I done Crying or Very sad

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

the convergence coils are connected separately to the mainboard with a 4 pin connector that has brown-purple-orange-black wiring.
You could try to swap the green and blue connector to see if the problem is with the coil or with the driving circuit. Next you could measure the coil using a multimeter. Measure two colors (B/G) and see if they measure the same.

huggy · Posted: Sun Oct 12, 2008 9:57 am Post subject:

I've swapped connectors and no reaction from both green and blue,but when i switch back green is fine, so I'm assuming its the coil,yes?So now I need the check the coils with a multimetre which I need to buy Sad

Stupid question,what are these coils,where are they and what exactly am I checking for?I assume I'm looking for voltage discrecancies.If so how and what do I adjust?
Sorry for all the noob questions Sad

This blue tube has always been a problem,it was always drifting a couple of centimetres everytime I switched it on,even after I'd wait an hour or so before I did convergence on it,when I would turn it on the next day it would always drift,so maybe its a related voltage problem?