CurtPalme.com Home Theater Forum

[deronmoped]

On my 10PG there was a POT on the deflection board that was marked "H-width". I took a quick look at the deflection board on the G90 and did not see a POT to adjust the horizontal width. I assume there is one for service adjustment. Does anyone know where the POT might be and how it is labeled?

[Curt Palme]

I don't think there is, at least I've never needed one. IF you have the test patterns filling and overshooting the tubes at max width,then use the RGB width control on the keypad if your input signal isn't filling the screen.

[Curt Palme]

I don't think there is, at least I've never needed one. IF you have the test patterns filling and overshooting the tubes at max width,then use the RGB width control on the keypad if your input signal isn't filling the screen.

[barclay66]

Hi,

Please have a close look at the Installation Manual. Raster Size and other geometry adjustments are to be done for each color using the Registration Menus (Installation Manual, Page 93). No trimpots (and there are a few) should be touched anywhere inside the PJ unless required after repair or board exchange (e.g. voltage adjustments after GA board repair/exchange).
Please take Your time getting familiar with all of the zillion options that this beast offers. I do have the impression that You're looking for shortcuts and might get disappointed if success doesn't happen fast enough. This approach isn't recommendable for this highly complex gear and could turn it into a boat anchor easily...

Kind Regards,
barclay66

[deronmoped]

I maxed out the H-width with the "size" control on the remote and the internal test pattern was still 3/8" from the right and left edge of the face of the tube. I will take a look to see if I can find some other control that will expand the width farther.

[HaydnG90]

Have you checked the raster on the tube face (low contrast and brightness). How close is it to the edge of the tube. You might be at max adjustment.

[deronmoped]

I checked the install manual and I did not see additional H-width size adjustments.

Is there a service manual out there?

Does a correctly set up G90, let you run the image to or past the phosphor edge, with controls on the remote?

[deronmoped]

I have not checked the raster yet. Remind me on how to see the raster, it's been years since I set up my 10PG. Turn up the contrast or brightness?

[deronmoped]

I found this post with a search:

"As far as horizontal goes, you can set the magnetics on the horizontal deflection board once you have the projector in its proper mounting location. If you take the decorative cover off the G90 you'll notice three holes in the cover of the horizontal deflection board. You do not even need to open the case!

Set the horizontal amplitude to neutral 128 on all there tubes in the service menu.

Align the three tubes mechanically, such that their outer edges are equidistant from the screen edges on the horizontal while the image is centered in the tube face horizontally.

Put up a cross hatch pattern from an external source.

Use an Allen wrench that fits the magnets behind the three holes and adjust this such that all thee tubes have the correct width at 128 +/-5 for the horizontal amplitude.

You may need to iterate a little bit because of the magnetic change due to the Allen wrench.

This will mitigate any need to push the horizontal amplitude much in either direction.

craigr"

It sounds like these are the individual H-width pots for each color. And what craigr was describing was adjusting the H-width for each color as to have uniform settings, as what the number would be displayed on the screen.

[HaydnG90]

[deronmoped]

So I need to put up a image (all white screen) and then turn the contrast and brightness down.

[deronmoped]

Is a input needed to see the raster? Right now I see no raster with internal images.

[tfuller]

All of the manuals are available here:
http://www.curtpalme.com/SonyG90_Downloads.shtm

The install manual is very explicit on what you should be doing to set up your projector. Please read through it and make sure you understand the steps before trying to get ad-hoc advice on adjustments out of context. The G90 is a very sophisticated digital unit that is quite different in setup, and as others have stated, you should not have to adjust any pots in a normal configuration. Being able to successfully configure this projector hinges upon your ability to follow directions in the manner given in the manual. If you need help with specific steps, I'm sure there are a few people who can help.

[deronmoped]

Well, don't need the ability to turn the G2 up to see the raster? The G90 does not have a function to control the G2 manually.

[AFryia]

[deronmoped]

I'm confused, I have not seen a "extended" setup menu, where is it.

What I did was enter the "expert/service" set up menu doing this. Press: Enter, Enter, up, down and Enter. Here, I set each color to MAX on the Course and Fine adjustments for each color individually. This only gets each color to within 3/8" of the edge of the phosphor. I also Checked RGB size and it was at MAX.

I found the Sony G90 "Factory Service" manual and the procedure for setting H-width after replacing the Defection coil or the deflection board. There is a easily accessible H-width POT on the deflection board. Right now I suspect that that is how I'm going to have to get the H-width to the edges of the tubes. That is the way I set it on my 10PG, I just turned up the H-width POT. I don't see how there could be any difference, in the end, the H-width will be where I want it, close to the edge of the phosphor/tube.

[AFryia]

[deronmoped]

Blanking is disabled when in the Service Menu. So I guessed that blanking was not a factor, but I will make sure that blanking is minimized in the user menu.

[AFryia]

Are your H-Size and V-size at 255 and still not to the edge?

[Curt Palme]

[Curt Palme]

[deronmoped]

Could the H-width setting on this particular G90 be set too low? What is the factory setting? Do G90's allow you to run the H-width up to or even past the edge of the phosphor?