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Discussion Starter · #1 ·
Hi all


Has anyone done the upgrade from 1252 to 1272?


What is involved?


Do you get the higher scan rate as well as the 21 point convergence?
 

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Hi,

i have the same question for a barcovision 701s to barcodata 701s....


Apparently it seams it would be too expensive regarding the jump in quality as it's a question of changing boards etc...


But if anyone know how...:)
 

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I dont know for sure, but according to several posts on the forum it is only a matter of changing the firmware to upgrade the 52 to being a 72.



--Kieth
 

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Bump.....


Hope this bump is worthy....
 

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We did some experimenting a few months ago taking the firmware out of a 1272 and putting it in the 1252. What we found was that the convergence went from 9 point to 21 point. That's a good thing.

I never really had an opportunity to run frequencies into this 52 to see if it came up to 72 specs. I have a suspision it won't.


Terry
 

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As we "speak" I'm trying to get my 1252Q upgrade to work. I'm damn frustrated.


It's a REALLY simple upgrade. Replace the Y board and you'll notice the following...


1) the CRT hour meter will change to the 1272Q hour count the board was removed from (tested- OK)

2) the Projector will now accept a line quadrupled image (tested - OK)

3) the convergence will be totally hosed (tested - OK unfortunately)

4) 21 point convergence will APPEAR to be there (tested - NOT OK)


Chuchuf- did you or your colleagues actually test that the 21 point convergence actually works? While my 1252 shows 21 points, only 1-9 actually are adjustable. Points 10-21 are not changable regardless of the setting (i.e. MAX & MIN do not appear to change the convergence at all)


Were there any other DIP switches etc that needed to be changed?


The upgrade was $250 through a reputable projection parts dealer (their site is widely used for projection specs) plus freight. I've been guaranteed they'll make it right for me, BUT I WANT IT NOW!! :p


This combined with the fact that I found out my sale of my NHT speakers fell through and my Magnepan center idea didn't work, along with a damaged cable I bought is REALLY RUINING MY WEEK.


Anybody want to trade a pair of Maggie 1.6QR's for a pair of MMG's plus some $$ in the NY area? E-Mail me: [email protected]


BTW- the Astig adjustment is a miserable task :confused:
 

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An update:


There are DIP switches on the Y Board. Who knows what they do? I'm really hesitant to play with them.


1:23AM another update:


Found chaper 4 of the service manual which told me how to "reinitialize the Y board after an EEPROM upgrade"


Lots of dip switch talk and Vulcan mysticism.


After 3 hours of reconverging my picture (which looks awfully good now) and cursing I still can't adjust points 10-21.


The sad part is...


I'll need to reconverge it anyway when I find out how to get the board working. Oh well I needed the practice. :rolleyes:
 

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Bump!


Anybody have the Service Manual that could look this up for me? I can't find the SM online. The one at Biggerhamme.net is a component level manual with diagrams of the boards but no info on how to set DIPs etc.


Thanks!
 
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