CurtPalme.com Home Theater Forum

[drudozucker]

Hi, I am long time dedicated CRT projector user but new to this forum.

My Barco Cine 9 (9/2001) has developed a fault and I am hoping somebody could hint me into the correct direction how to get it resolved. This is the problem: After a session of approx. 1hour the projected image suddenly started to get out of focus, or better said, the picture is now continuously changing from "in focus" to "out of focus" whilst at the same time the picture size is changing by a small amount. This happens at a frequency of 1/2 Hz or so, although it is not totally regular, in actual fact it seems to stop sometimes for a small period. The effect is to all 3 colors in sync., so that I assume a voltage reference might playing up. I am also hearing (it might be unrelated) a noise coming from the left side, rear end (projector mounted on the ceiling). The noise is not caused from the ventilation fan which sits close by- it seems to be originated a small distance apart, to the left. The problem starts now after a very short period when powered up from cold, making me think of a temperature related component issue. The Barco's inbuilt voltage diagnostic shows no unusual or very unstable voltage.

Unfortunately, I do not have a service manual for the Cine 9 (nor could I find one on line), hence I would very much appreciate an experts advise what to do next (beside calling the Cineversum service which is unfortunately quite far from my location).

Thanks for your help.

Udo

[Curt Palme]

Your EHT board is bad most likely. Your HV regulation is changing/shifting.

I've got spare EHT boards.

Curt

[Curt Palme]

Your EHT board is bad most likely. Your HV regulation is changing/shifting.

I've got spare EHT boards.

Curt

[drudozucker]

[Curt Palme]

http://www.curtpalme.com/Barco1208_Layout3.shtm
Shoot me an email to curtpalme@shaw.ca.

Thanks!

[Curt Palme]

http://www.curtpalme.com/Barco1208_Layout3.shtm
Shoot me an email to curtpalme@shaw.ca.

Thanks!

[drudozucker]

Hi, just sent. Once again, thanks a lot for your speedy response. Udo

[r.bauer]

Curt is right. My projector had the same problem. The newer style EHT boards can show this behavior, the old type simply quit working. Can be very difficult to find the source of this problem on the board. Just get a new one form Curt and you are fine.

[mp20748]

Interesting, that the boards will interchange between a Cine9/909 and a 1208/1209/808.

I have them both here, and they look a little different, but not much.

[jantje112]

[mp20748]

[drudozucker]

[Curt Palme]

There are two types of EHT boards, pre 1998 and post 1998. Oh, and a third, that was used in the bArco 800s and 500s.

All can show that picture pulsing and defocusing. While the EHT board has relatively few parts on it, it's one of the hardest to troubleshoot due to the various feedback/sensing circuits on it.

Due to lack of parts out there for the later sets, I've converted a few of the newer sets to the older EHT and quadrupler type. That's why I have spares of the new EHT board. It was always the quadrupler that died in the 3 that I converted here.

I quickly answered your email, pls send me a picture of the component side of the EHT board so I can make sure that the ones I have are identical to that in the Cine 9.

Cheers!

[Curt Palme]

There are two types of EHT boards, pre 1998 and post 1998. Oh, and a third, that was used in the bArco 800s and 500s.

All can show that picture pulsing and defocusing. While the EHT board has relatively few parts on it, it's one of the hardest to troubleshoot due to the various feedback/sensing circuits on it.

Due to lack of parts out there for the later sets, I've converted a few of the newer sets to the older EHT and quadrupler type. That's why I have spares of the new EHT board. It was always the quadrupler that died in the 3 that I converted here.

I quickly answered your email, pls send me a picture of the component side of the EHT board so I can make sure that the ones I have are identical to that in the Cine 9.

Cheers!

[drudozucker]

[mp20748]

Image is of a Cine9/909 Quad and EHT module

[drudozucker]

Hi, my curiosity resulted in pulling my Cine 9 immediately apart. The pictures are made of the EHT. I have also taken details from the Quadrupler, still inside the Cine 9: R563368 Index 0 04 36/01-M283040 (I am not entirely sure if the first digit is a 5). The number on the EHT is R7622´7165-02. The Cine 9 was manufactured September 2001. Hope this helps. Regards Udo

[Curt Palme]

Mike, that's the HV splitter, not the quad..

The new and old EHT boards need to get swapped as a pair, with a mod that has to be done to it so that it works in the new style sets.

The HV splitter part number changes with the new style as well, but is electrically identical to the older ones. The quad and EHT are not interchangable, new and old.

Dr Zucker, I have that EHT board. Let me run one over the weekend, and I'll be in touch re pricing, payment, repair of yours, etc.

Cheers!

[Curt Palme]

Mike, that's the HV splitter, not the quad..

The new and old EHT boards need to get swapped as a pair, with a mod that has to be done to it so that it works in the new style sets.

The HV splitter part number changes with the new style as well, but is electrically identical to the older ones. The quad and EHT are not interchangable, new and old.

Dr Zucker, I have that EHT board. Let me run one over the weekend, and I'll be in touch re pricing, payment, repair of yours, etc.

Cheers!

[r.bauer]

My projector is a late model 1209s with the new style EHT board R762716. Curt is right about troubleshooting this board. I have put some serious effort into fixing my broken board, but I could not get it fixed after replacing a couple of dozen parts on it. Buying a replcement board was the solution for me.

I had exactly the same problems as Udo describes. Not only goes the picture out of focus, but the image size also varies. Less EHT voltage means a bigger image because the force that attracts the electrons to the fosfor is reduced, so the deflection will have more impact and the image will be a little bigger.

The number that Udo's EHT has, R7617265, can be replaced by the number R761726. The addition of a 5 (or a 1 or a 2) to a number means a minor upgrade/change, but the boards are still interchangeable. The picture from Mark and Udo look exactly like my board.

Unfortunately the newer style EHT boards have a higher failure rate than the old type board. Barco made the new board more reliable, but unfortunately it did not held up to this expectation. It is however a very good board, when functioning properly. Slow EHT rise, better protection etcetera.

Here is more about the new style EHT board: http://www.curtpalme.com/docs/BarcoServiceBulletin_R762716_New_EHT.pdf

Udo, Just get a new board from Curt and you are fine. They are not that expensive, and your Cine9 is worth it.

(BTW, I just ISF-ed a Cine9 a couple of weeks ago, man that is one sharp beast!)

[drudozucker]

[r.bauer]

[Curt Palme]

Well call me insane, but I spent a day today working on Marquee convergence boards, and did some ECP boards over the holidays. Why I repaired ECP boards, I'm not really sure, but exploring defective boards with a scope and meter is what I do to have fun. Hopefully there's some profit involved as well, but not always..

[Curt Palme]

Well call me insane, but I spent a day today working on Marquee convergence boards, and did some ECP boards over the holidays. Why I repaired ECP boards, I'm not really sure, but exploring defective boards with a scope and meter is what I do to have fun. Hopefully there's some profit involved as well, but not always..

[drudozucker]