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G70 Blue tube swap (now the horizontal focus is off?)

 
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jcarson



Joined: 28 May 2009
Posts: 25
Location: Melbourne Australia

Posted: Fri Jul 09, 2010 12:08 am    Post subject: G70 Blue tube swap (now the horizontal focus is off?)

I've just installed a new (lightly preloved) blue tube with all housings attached - but now the blue tube horizontal focus is off It looks wide and fuzzy on the raster while the vertical seems ok.

Is there something I've missed?

I did notice that the neck of the tube had one less pin than the tube I took out - is that normal in G70 tubes?

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Mark_A_W



Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia

Posted: Fri Jul 09, 2010 1:02 pm    Post subject:

Have you tweaked the 2 pole magnets and then adjusted electronic astig?
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jcarson



Joined: 28 May 2009
Posts: 25
Location: Melbourne Australia

Posted: Fri Jul 09, 2010 1:35 pm    Post subject:

I've been working on in tonight - without the EM focus on it's pretty blurry, (whereas the other tubes are tight focus) - even with Em focus on its only OK

I haven't tried lens flapping or pole magnets yet (is that the G2?)

This post seems to suggest that the C blocks aren't necessarily interchangeable between PJ's...anyone else had this experience?

http://www.curtpalme.com/forum/viewtopic.php?p=242267

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Mark_A_W



Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia

Posted: Fri Jul 09, 2010 9:52 pm    Post subject:

Lens flapping will not affect the centre of the tube.


No, the 2 pole magnets are not G2. They are the little magnets on the very end of the tube.
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Mark_A_W



Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia

Posted: Fri Jul 09, 2010 10:11 pm    Post subject:

Use the original neckboards (C blocks).
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jcarson



Joined: 28 May 2009
Posts: 25
Location: Melbourne Australia

Posted: Fri Jul 09, 2010 11:09 pm    Post subject:

Thanks guys - i think you've solved my problems, I wasn't sure i had to do anything physical to the tubes or not..looks like I do I'll do some reading on the poles and get twisting....
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CIR Engineering



Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany

Posted: Sat Jul 10, 2010 3:16 pm    Post subject:

jcarson wrote:
Thanks guys - i think you've solved my problems, I wasn't sure i had to do anything physical to the tubes or not..looks like I do I'll do some reading on the poles and get twisting....

Before you adjust the 2-pole physical magnets, be sure to enter the service mode and reset ALL blue focus parameters back to 128. This includes 2-pole, 4-pole, and anything else. After that defocus blue in the service mode to enlarge the dots when doing the 2-pole physical setup.

craigr

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