CurtPalme.com Home Theater Forum

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

i'm working on getting my hands on a colorimeter but i need to refresh my memory.
**the AKB line, should i disable it? it seems to have gotten more noticable over time.
**G2, is there anything else to default other than contrast and brightness before i adjust? would the status of the AKB affect the g2 adjustment?
thx!
regnad

**AnalogRocks** · Posted: Tue Feb 10, 2009 6:37 am Post subject:

Wow the Sony 12xx series are coming out of the wood work this week.

We'll require the manditory screen shots when you get it done Thumbs Up

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

im no photographer but heres a few older pics. you'll recognize one of those desktops. my screen is 108" blackout cloth...

imprez25 · Joined: 01 May 2007 Posts: 70

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

I CANT FIND THE INFO NOW, WHAT VOLTAGE SHOULD I HAVE ON MY G2? 2 DIFFERENT VOLTAGES FOR 2 DIFFERENT TUBES/LENSES RIGHT?
SRY FOR CAPS!

imprez25 · Joined: 01 May 2007 Posts: 70

Right there are two different voltage amounts for the Sony 12xx's either 1.5v or 4.0v depending on the generation of your projector. You will have to look around to see what yours should be at.

I'm sure you've seen this: http://www.curtpalme.com/Sony125x_White_Balance.shtm
But if not....

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

yeah, i just cant remember which is which. something about a blue sticker on the sides. hopefully someone can chime in with that, im not having much luck finding the old post on the topic.

Blorton · Joined: 27 Jan 2009 Posts: 105 Location: Hotlanta, GA

07MSP tubes get the 1.5v setting, apparently.

tony359 · Joined: 04 Aug 2006 Posts: 378

I suggest NOT to disable AKB.

I disabled it on my 1272, then I enabled it after one year of use. I could not see the difference, but mainly without AKB you have to wait 10/15 minutes until the brightness of the picture reach its maximum.
I realize it was because the AKB was deactivated just after many many many recalibration of the brightness Very Happy

**AnalogRocks** · Posted: Wed Feb 11, 2009 4:36 pm Post subject:

How do you disable the AKB again?

tony359 · Joined: 04 Aug 2006 Posts: 378

What do you mean?

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

ok, i'll skip the AKB. but i need to confirm which voltage i need to go for, and do i need to set g2 with a no feed input?

tony359 · Joined: 04 Aug 2006 Posts: 378

What do you mean with skip?
I don't know your particular voltage. But you have to run the CRT for a while, then set the G2 with the BIAS screen displayed.

Ciao
Antonio

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

i mean i wont turn off the AKB. about the g2 settings. i have the blue serial number sticker on the case, which tubes do i have and what voltage shouls i have? and when setting voltage, after reseting gain and bias and setting the contrast to 80 and brightness to 50, should i sellect an input with no feed or just set with souse connected?

Blorton · Joined: 27 Jan 2009 Posts: 105 Location: Hotlanta, GA

Just swing up the board covering the tubes and look at the stickers on them. If you have the 07msp, 1.5v is supposed to be the value. And set it with the input set to an unused port.

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

i do have the 07msp tubes so i'll adjust to 1.5 vdc with no source connected.

tony359 · Joined: 04 Aug 2006 Posts: 378

I would not just reset the BIAS and GAIN value: I would set them to 128. Sony's procedure is incomplete for me: it's not explained how to set that values if you make a total reset. So IMHO the stored values have no particular importance.

I do not remember if you have to set a no-input status... check on the service manual. But I think it's not so important.

Ciao
A

Blorton · Joined: 27 Jan 2009 Posts: 105 Location: Hotlanta, GA

http://www.curtpalme.com/Sony125x_Layout4.shtm

See that angled downhard heatsink area at the top? That is attached to a large swinging plate - you want to work the perimeter of that plate to loosen/remove screws and ease it up. You'll see the tubes underneath that.

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

its much more painful to the neck doing this upside down!! i didnt realize i could see so much of the tube with this board open! ok, my next question...i have seen a couple of people adjusting gain and bias by looking into the lens, will i still need to to this? what is the next step after setting g2 with the meter? i have the DVE disk ready to make the next adjustment...

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

ok guys, ive reset my g2 to 1.5 vdc with contrast @ 80 and brightness @ 50. i understand these are the factory defaults? and with no source connected. i then popped in DVE and went through the basic video adjustments. the brightness at 50 was too bright and i dropped it down to 35 per the brightness vid test on the disk. i went through the rest of the basic adjustments. my g2's were way off and my picture is much better now. and my AKB line is much less noticable now! im still loosing shadow detail though. what would be the next step? i asked earlier about the adjustments of the bias and gain by looking into the tubes but no one responded. wouldnt that screw up my physical adjustment of the g2 that i just done? or was that adjustment just ment to put me in the ballpark of correctness?